TM_11-5830-340-30

ARMYNAVY

TM 11·5830·340·30EEl 05·FE·MMA·Ol O/Wll O·VICIV

TECHNICAL MANUAL

DIRECT SUPPORT MAINTENANCEHOW TO USE THISMANUALPAGE iii

MAIN 'N/R INT ACCENT RADIO TRANS

COlI. 0NOflM ......~ ON __~ CREW......~

INT _ COR OHLY- ~

C:~; J 0 OFF -- 0 LlSTENIN9---SILENCE

ONO~OPOWER'& CKT &KR

OFF F 3@POWER 0 0

AlOO IHI'IIT

--0;:::--sTG-

(5)~;;~\ALL [SA ~~~ liNT'""&\ / ONLY~ONI )-

l; ~ --DB

(W o-dc

,;

0

RADTRANS

~ ~ O?2 VOLUME INT LINE'

~ -~

[-~

EQUIPMENT DESCRIPTIAND DATAPAGE 1-2

PRIN~IPlES .OF OPERATIONPAGE 1-6

INTERCOMMUNICATION SETAN/VIC·l (V)

(NSN 5830-00-856-3273)This publication Is required for official use or foradministrative or operational purposes only. Distribution Islimited to US Government Agencies. Other requests for thisdocument must be referred to Commander. US ArmyCommunlcatlons·Electronlcs Command and Fort Monmouth,AnN: AMSEL·ME·P, Fort Monmouth, NJ 07703·5000.

DEPARTMENTS OF THE ARMY AND THE NAVY15 SEPTEMBER 1986

ILLUSTRATED LIST OFMANUFACTURED ITEMPAGE (,1

Technical ManualNo. 11-5838-340-30Technical ManualEEl 05-FE-MMA-01 0/W11 0-VICIV

DIREO SUPPORT MAINTENANCE MANUALINTERCOMMUNICAT~ON SET AN/VIC·l (V)

(NSN 5830-00-856-3273)

*TM 11-5830-340-30EE105-FE-MMA-010/Wl10-VICIV

DEPARTMENTS OF THE ARMYAND THE NAVY

Washington, DC, 15 September 198~

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTSYou can help improve this manual. If yOU find any mistakes or if you know of a ,way to improve the

procedures, please let us know. Mall your letter, DA Form 20Z8 (Recommended Changes to Publicationsand Blank Forms), or DA Form 2028-2 located in back of tbis manual d'~t to: Co~mander, USArmy Communications-Electronics Command and Fort Monmouth, ATfN: AMSEL-ME..MP, FortMonmouth, New Jersey 07703-5000.

For Navy, mail comments to the Commander, Space and Naval Warfare Systems Command, ATfN:SPAWAR 8122, Washington, DC, 20363..5100.

In either case a reply will be furnished direct to you.

·This manual supersedes TM 11-5820-401-30-4, 17 November 1981, TM 11-5820-401-35-6,I November 1973, TM 11-5820-402-35-7, 16 April 1973, TM 11-5820-401-35-8, 1 November 1973 and TM11-5830-257-30&P, 26 January 1981.

Page

'HOW TO USE THIS MANUALI iii

CHAPTER 1 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section I General Information 1-11-1. Scope.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-2. Maintenance Forms, Records, and Reports 1-11-3. Reporting Equipment Improvement Recommendations (EIR) 1-11-4. Administrative Storage. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . ... . . . . . .. . .. .. .. .. . 1-11-5. Destruction of Army Electronics Materiel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-6. Consolidated Index of Army Publications and Blank Forms. . . . . . . . . .. .... ... 1-1

Section II IEquipment Description and Datal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21-7. Equipment Characteristics, Capabilities, and Features 1-21-8. Description of Major Units. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 1-21-9. Audio Accessories 1-31-10. Radios and Mounts 1-31-11. Difference'Data 1-31-12. Equipment Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41-13. Safety, Care, and Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Section III 1-61-61-61-71-81-81-8

~

.("nQ)eNoW.&:aooWo

TO EXTERNAL.I • SIGNAL LAMP

L@]

IRAOTRANS

~VOLUME INT

~

~If~rry-'~ EX~~~\~OFF~

IJ9041.~ I ALL A IJ901 I~\ / INTO~ / ONLY

:JI tltONI)-

I ~~ --

.LOW'BAND R 0-'

~

~IJ9031 - IJ9021

o..

Control, Intercommunications Set C-2297/VRC Control, Intercommunications Set C-2296/VRC

US07/ IJS061 Usosl

EL9XVOO2

Contro~ Intercommunications Set C-2298/VRCor C-I0456/VRCInwrcommunications Set AN/VlC-l(V)

IJS10I IJS041 / i'isosl(MARKED "LINE" IN SOMEEQUIPMENT)

Amplifier, Audio Frequency AM-1780/VRC

MAIN rWR INT ACCENT RADIO TRANS

NORM~COR. 0

~Oll , ~O 'JsdJf ALL r9NAT

INT OhilJ: CREW~ONLY- ~ COR ON..Y- (I 0\ /ONLY

OFF - 0 L1STENIN<L,OFF../ 0 SILENCE RADIO N,,,. B

ONO®OPOWER

CKT BKR YELLOW

OFF

F 3 INT ONLY""" ~031. ~o BAND

@ OTHER-@RETRANS- RADIO

POWER I 0 0 0 0 llNSTALLATtoNSWITCH

AVOIO INPUT

TOC-2299NRC

E~'!

IIJSlll

DO NOT TRY TO PUll OR GRAB THE "INDIVIDUAL

IF PfJ:SSI'BlE TURN D'FF THE ELECTRICAL POWER, ,

IF VOI[;J"CANNOT TUR'N OFF THE ELECTRICALPOW6;B~!:PU.L,L, PUSH ·,oR LI FT THE PE,RSON TOSAFETY USI'NG A WO'ODEN POLE OR AROPE ORSOME OTHER INSULATING MATERIAL

+r;I1:.1

11;",1'\'.<

mS

TSAFETY STEPS TO FOLLOW,IF SOMEONEIS THE VICTIM OF .E1ECT,ijICAl SHOCK

TM 11·5830.340·31

+

SEND FOR HELP AS SOON AS POSSIBLE

AFTER THE INJURED PERSQN IS FREE OFCONTACT WITH tHE SOURCE OF ELECTRICALSHOCK, MOVE THE PERSON f!. SHORT DISTANCEAWAY AND IMMEDIATELY START ARTIFICIALRESUSC'ITATION

LINE binding postsAUDIO INPUT binding postsRadio transmitter microphone

input circuitRadio receiver audio output circuits

Operating voltage requirements

CONTROL BOXES

C-2296/VRC, C-2297/VRC, C-2298/VRCFrequency rangeIntercom functionRadio function

C-10456/VRC (M1 ABRAMS TANK) -Modified C-2298/VRCFrequency rangeIntercom functionRadio function

Remote intercom/radio keyingfunction

TM 11·5830·340·30·

600 ohms ±20 percent5,000 ohms150 ohms ±20 percent

150 ohms ±20 percent22 to 30 Vdc

500 to 3,000 Hz (audio)Provides communication between crew membersProvides communication over all radio components

connected to AM-1780/VRC

500 to 3,000 HzProvides communication between crew membersProvides access to all radios connected to

AM-1780/VRCProvides remote keying from various M1 Abrams

tank controls

1-13. SAFETY, CARE, AND HANDLINGa. Safety

(1) You must report unsafe equipment conditions to your supervisor.

(2) If equipment electrical power is Oll, find out where shutdown switches are before beginning maintenance. You must be able to turn power off quickly in an emergency.

(3) Read and heed all WARNINGS in the maintenance procedure you are performing. They arethere to prevent injury and possible death.

b. Care

(1) Read all CAUTIONS in the maintenance procedure you are performing. They are put there tohelp you protect the equipment from damage.

(2) Keep your equipment clean and in operating condition.

c. Handling. The intercommunication set does not require any special handling.

Section III. PRINCIPLES OF OPERATION

1-14. SYSTEM OVERVIEW

,.._-------------- ~H/V'C-'(V)------""..."I

Ttr------, I

- - - -1 "AOIO ~ - - - .J

I IL ..J

AM-1780IVRC

r--t L--r-...........--"tI

II,

TELEPHONE

C·~2'7/VRC

H-to?IVRC

EXT .. -LAM'

r--t

•II

••TELEPHONE

c- tZ881V"C'S

EL9XV006

CD AM-1780/VRC. Distributes power to crew membel' control boxes. Receives intercommunication andradio audio, amplifies and distributes it to crew member c9ntrol boxes. Amplifies and routes transmitaudio to selected radio.

<ID C-2298/VRC. Selects radio or intercommunication for microphone output. Selects which radio audiois monitored.

@ C-2296/VRC. Selects radio 01' intercommunication for microphone output. Provides connection ofexternal signal (call) lamp and field telephone. Must be connected to C-2297/VRC.

@ C-2297/VRC. Selects radio or intercommunication for microphone output. Selects which radio audiois monitored. Controls operation of C-2296/VRC.

Intercommunication Set AN/VIC-l(V), Block Diagram

1-15. AM- 1780/VRCa. General. The AM-1780/VRC includes 10 jacks for connection to radios, crew member control boxes

and dc power. There are five selector switches, two sets of binding posts and an intel'phone amplifier.

Crew member control boxes are connected to J505 through J507. J505 through J507 are wired inparallel. The commander's control box is connected to J 504.

Receiver-Transmitter may be connected to J501 and/or J503. Additional receivers may be eonnectedto J510 and/01' J508.

When two receiver-transmitters are provided, automatic relay operation may be accomplished, usinga C-2299/VRC retransmission control box connected to J509 and J511.

The output of a third receiver may be connected to the AUDIO INPUT binding posts and a fieldtelephone may be connected to the LINE binding posts.

b. Power Distribution. Figure FO-2 shows dc po~er distribution to and from the AM-1780/VRC.

When radios are not used with the AM-1780/VRC, dc power is applied to J508 and the INS'rALLATION switch must be set to INT ONLY.

TM 11-5830-340-30

When radios are used, dc power is applied through J501 and th.e MAIN PWR switch must be set toNORM to supply power to the A radio set. When the POWER CKT BKR is set to ON, power isapplied to the radio-intercom system.

Crew member control boxes receive dc power from the AM-1780/VRC.

c. Radio Transmission and Keying. Figure FO-3 shows the circuits involved in microphone audio andkeying control signals.

Pressing the push-to-talk switch on an audio accessOl'Y applies a ground through the crew membercontrol box and AM·1780/VRC to the radio keying relay.Microphone audio is processed by the control box, then the AM-1780/VRC, and is sent to the radiotransmission circuits.

When intercom keying relays K501 and K502 are operated the radio keying control relays areinterrupted for all crew members except the crew commander (connected to J504).

d. Radio Reception. Figure FO-4 shows the radio reception circuits. When the crew member control boMONITOR switch is in the ALL ·position, fixed level audio from the radio is' processed by the AM1780, sent to the crew member control box and processed, and is then sent to the audio accessory.If the INT ACCENT is set to ON, an extra attenuating resistor is added to the radio reception circuit, causing the intercom audio to appear louder (accentuated).

Fixed level audio is also processed from one radio through the AM-1780/VRC, the retransmissioncontrol box, to the second radio.Variable level audio from the radios is processed by the AM-1780/VRC, sent to the crew membercontrol boxes and is processed for the audio accessories.

Receiver output attached to the AUDIO INPUT binding posts are processed the same as fixed levEaudio.

e. Intercom Circuits. Figure FO-5 shows the circuits involved in intercom audio and intercom keyingcontrol.

The commander's control box must be connected to J504 of the AM-1780/VRC. Crew member COl

trol boxes may be connected to J505, J506, or J507.

Operating the audio accessory push-to-talk switch at the commander's control box operates relaysK501, K502, and K503.

Operating the audio accessory push-to-talk switch at the crew member control boxes operates rela:K50l and K502.

Relay K503 cannot be operated when relays K501 and K502 are operated. This allows the commaer to transmit on radios when crew members have the intercom keyed.

With the relays operated, microphone audio is processed by the control box, sent to the AM-1780/VRC, processed, and sent back to the earphones.

Intercommunication, using a field telephone, functiuns the same as above. except that the push-totalk switch must be released to hear a reply.

f Interphone Amplifier. The interphone amplifier processes all audio signals except variable level raeaudio.

1-16. C·2298/VRCC-2298/VRC is one of the crew member control boxes that may be used in the AN/VIC-l (V) intercorset.a. It may be connected to AM-1780/VRC or to another C-2298/VRC.

b. All power and control voltages are passed through J80l or J804.

c. J801 and J804 are wired in parallel.

d. Audio accessory attached to J802 can control keying of either radios or intercom.

e. Audio accessory attached to J803 can control keying of intercom only.

f MONITOR switch selects audio and microphone circuit connections to J802 and J803.g. Microphone output is amplified by assembly A80.

TM 11-5830-340-30

1-17. C-2297/VRCC-2297/VRC is a crew member control box that may be used in AN/VIC-l (V) intercom set, driver'sposition.

a. Power and control voltages are received from AM-1780/VRC through J904.

b. Power and control voltages to and from C-2296/VRC are made through J901.

c. Audio accessory attached to J902 can control keying of radios or intercom.

d. Audio accessory attached to J903 can control keying of intercom only.

e. MONITOR switch selects audio and microphone circuit connections to J902, J903, and C-2296/VRC.

f Microphone output is amplified by assembly A80.

1-18. C-2296/VRCa. Power and control voltages are passed through J61 from C-2297/VRC.

b. External signal (call) lamp is attached to J62.

c. Handset H-207/VRC is part of C-2296/VRC.d. LINE binding posts provide connection to land line or field telephone.

e. RAD TRANS-INT switch provides connection of handset output to radio or intercom circuits.

f. Handset output is amplified by assembly A80.

1-19. C-10456/VRCOperates the same as C-2298/VRC with the following exceptions:

a. Remote keying of radio or intercom is provided through J805 and vehicle wiring.

b. Solid-state switch assembly A81 is used to block or pass output of microphone amplifier assemblyA80.

c. With dummy plug P805 installed, remote keying function is bypassed.

·8

TM 11-5830-340-30

CHAPTER 2

DIRECT SUPPORT MAINTENANCE

Section I. REPAIR PARTS, SPECIAL TOOLS, TMDE,AND SUP'PORT EQUIPMENT

2-1. COMMON TOOLS AND EQUIPMENT

For authorized common tools and equipment !efer to the Modified Table of Organization and Equipment (MTOE) applicable to your unit.

2-2. SPECIAL TOOLS, TMDE; AND"SUPPORT E·QUIPMENT

Refer to TM 11-5830-340-23P and appendix C of this manual for the special tools, TMDE, and supportequipment to maintain the intercommunication set.

NOTEOld TMDE is being phased out and replaced by new TMDE. Refer to the MaintenanceAllocation Cba_tin 1.'1\1,11..5830..;340-12 for replacement data.

2-3. R.EPAIR PARTS

Repair parts are listed and illustrated in the Repair Parts and Special Tools List, TM 11-5830-340-23P

Section II. TROUBLESHOOTING

2-4. GENERAL TROUBLESHOOTING

This section contains troubleshooting procedul'es for the intercom set. The following paragraphs givefault verification, troubleshooting data and troubleshooting actions for AM-1780/VRC, C-2296/VRC,C-2297/VRC, C-2298/VRC and C-I0456/VRC.This manual cannot list all malfunctions that may OCCUl\ nor all tests or inspections and correctivemeasures. If a malfunction is not listed, or is not corrected by the listed corrective actions, notify yoursupervisor.Visual inspection will locate many faults without testing the circuits. All visual signs should be observedand an attempt should be made to localize the fault.

2-5. AM-1780NRC TROUBLESHOOTING

a. Fault Verification. Fault verification for the AM-1780/VRC consists of checking the AM·1780/VRCto make sure the problem reported by organizational maintenance exists. Thjs is done by perlorminJthe operational check in 2-13a, below. You must perform the operational check to make sure that yohave solved the problem. Do this after replacing the faulty assembly.

b. Using Troubleshooting Data. When the fault symptom has been determined for the AM-1780/VRC,refer to the listing of that symptom in the following symptom index.

AM-1780/VRC SYMPTOM INDEX

Symptom

Commander cannot key intercom in C position of MONITOR switch.Crew members cannot key intercom in A, ALL 01' B position of MONITOR

switch.No control of A radio (receiver-transmitter).No control of C radio (receiver-transmitter).No audio from B receiver.

Troubleshooting paragraph

2-5c(6)2-5c(5)

2-5c(1)2-5c(2)2-5c(3)

TM 11 ~S830~340-30

Indication Obtained?Yes No

NormalIndication

A250~5A250·4

Instruction

c. Troubleshooting Actions ~ Continued

(1) Radio A Circuits ~ Continued

NOTEFor AM·1780/VRC provided with variable gain amplifier assembly A250, the required outputmay be obtained by adjusting potentiometer R260. For AM-1780/VRC with fixed gainamplifier assembly A250B, no adjustment is provided.

Step

A2S0~1 A250-2 J512 EL9XVOO8AM-1780/VRC Test Point Locations

12 Use TS-352B/U and measure +25.5 V. Go to step Go to stepdc voltage between A250~2 14. 13.(ground) and A250-4.

13 Measure dc voltage between +25.5 V. Replace Go toJ512-A and J512~E (ground) A520. 2~5c(11)

14 Use AN/USM-281A and ob- W (1 kHz signal from Go to step Repair cir~

serve waveform at J 512-7 and AN/URM~127.) 15. cuit be~note amplitude. tween

J501~K

andJ512~7.

Observe waveform at J512-K. Amplifier 1 kHz signal. Repair cir~ Go to step(Reference step 14.) cuit be- 16.

tweenJ512-Kand J504~L.

Observe waveform at A250~5. Attenuated 1 kHz signal. Go to step Go to step(Reference step 14.) 19. 17.

1M 11-5830-340-30

c. Troubleshooting Actions - Continued

(1) Radio A Circuits - Continued

Step InstructionNormal

IndicationIndication Obtained?Yes No

ReplaceA250.

ReplaceA250.

ReplaceA520.

ReplaceA4.

Go to step18.

ReplaceA520

If continuity is notobtained, repairfaulty circuit.

Go to step25.

ReplaceA520

Repair circuit betweenJ512-Land J512F (INTACCENT).

Go to step20.

Go to step21.

ReplaceA520.

EL9XV009AN/USM·281 A

oohms.

Same as step 21.

Amplified 1 kHz signal.

1 kHz signal, greater amplitudethan step 22.

Attenuated 1 kHz signal.(Reference step 14.)


Observe waveform at J512-J.

Adjust TS-723/U to measuredistortion.

Connect TS-723/U AF INPUTleads to terminals L and A oftest cable 1B.

Observe waveform at A250-1and note amplitude

Observe waveform at J512-B.

Observe waveform at J512-1.

Observe waveform at J512-F.

Less than 10% distortion andundistorted sine wave onAN/USM-281.

NOTEFor AM-1780/VRC's with fixed gain audio amplifier A250B, distortion will normally be lessthan 1%.

Turn off power and disconnectPP-ll04/G, AN/URM-127,TS-723/U and 100 ohmresistor.

Set all AM-1780/VRC switchesto full counterclockwise.

Set TS·352B/U to measureresistance, RX1.

Mesure continuity betweenthe following points (testcables may be used to facili-tate connections:

J501-A to groundJ501-H to J504-MJ501-U to J504-KJ501-T to J511·TJ501-U to J511-UJ501-S to J511-SJ501-K to J511-KJ501-U to J505-KJ501-H to J505-M

27

25

24

23

28

22 Connect AN/USM-281A to TS-723/U OSCILLOSCOPEterminals.

21

20

26

19

18

17

TM 11-5830-340-30


(2) Radio C Circuits - Continued



11

12

Connect ME-30(*)/U to outputof AN/URM-127.

Adjust output level of ANIURM-127 to obtain between11 and 13 Vae onl'S-723(*)/U.

NOTEThe ME-30(*)/U is used to measure the output level of AN/URM-127.

Between 0.170 and 0.276 Vac Go to step Go to stepread on ME-30(*)/U. 23. 13.

NOTEFor AM-1780/VRC provided with variable gain assembly A250, the required output may beobtained by adjusting potentiometer R260. For AM-1780/VRC with fixed gain amplifierassembly A250B, no adjustment is provided.

A250-4 A250·5

A250-1 A250·2AM-IiiI(J7Vkc Test Point Locations

J512 EL9XV008

!-B

13

14

15

Use TS-352B/U and measurede voltage between A250-2(ground) and A250-4.

Measure dc voltage betweenJ512-A and J512-E (ground).

Use AN/USM-281A andobseIVe waveform at J512-2and note amplitude.

+25.5 V.

+25.5 V.

'I n n n (1 kHz signal from ANIU U U L.URM-127.)

Go to step15.

ReplaceA520

Go to step16.

Go to step14.

Go to2-5c(11).

Repaircircuit betweenJ501-KandJ512-6.

1M 11-5830-340-30


(2) Radio C Circuits - Continued


IndicationIndication Obtained?

Yes No

16

17

Observe waveform at J512-K.

Observe waveform at A250-5.

Amplified 1 kHz signal.(Reference step 15.)


Repair circuit betweenJ512-Kand

J504-L.Go to step

20.

Go to step17.

Go to step18.

ReplaceA250.

RepairA250.

ReplaceA520.

ReplaceA4.

Go to step19.

ReplaceA520.

Go to step26.

EL9XV009

ReplaceA520.

Repaircircuit betweenJ512-1andJ512-F(INTACCENT).

Go to step2l.

Go to step22.

ReplaceA520.

TS-723/U

I~ AN/USM·281A I

1 kHz signal, greater amplitudethan step 20.


Same as step 20.



Observe waveform at J512-l.

Observe waveform at J512-F.

Less than 101r distortion andundistorted sine wave on AN/USM-28l.

NOTE

For AM-1780/VRC's with fixed gain audio amplifier A250B, distortion will normally be lessthan 1 %.

26 Turn off power, disconnect PP-l104/G, AN/URM-127, TS723/U, and 100 ohm resistor.

27 Set all AM-1780/VRC controlsfully counterclockwise.

28 Set TS-352B/U to measureresistance RXI.

29 Measure continuity between the 0 ohms. If continuityfollowing points (test cables is not ob-may be used to facilitate tained,connections): repair

the faultycircuit.

18

19

20 Observe waveform at A250-1and note amplitude.

21 Observe waveform at J512-B.

22 Observe waveform at J512-J.

23 ConnectAN/URM-281A to TS-723/U OSCILLOSCOPEterminals.

24 Adjust TS-723/U to measuredistortion.

25 Connect TS-723/U AF INPUTleads to terminals L and A oftest cable IE.

2·'

TM 11·5830·340-30


(3) Receiver B Circuits - Continued



11

12


Adjust output level of AN/URM·127 to obtain between11 and 13 Vac onTS-723(*)/U.

NOTEThe ME-30(*)/U is used to measure the output level of AN/URM-127.

Between 0.170 and 0.276 Vac Go to step Go to stepread on ME-30(*)/U. 23. 13.

NOTEFor AM-1780/VRC provided with variable gain assembly A250, the required output may beobtained by adjusting potentiometer R260. For AM-1780/VRC with fixed gain amplifierassembly A250B, no adjustment is provided.

A250-3 A250-4 A250·5

A250·1 A250·2

AM-1780/VRC Test Point Locations

J512 EL9XV008

13

14

15

2·12

Use TS-352B/U and measuredc voltage between A250-2(ground) and A250·4.


Use AN/USM-281A. Observewaveform at J512-6 and noteamplitude.

+25.5 V.

+25.5 V.

(1 kHz signal fromAN/URM-127.)

Go to step15.

ReplaceA520.

Go to step16.

Go to step14.

Go to2-5c(11)

RepaircircuitbetweenJ501-KandJ512- 6.

TM 11-5830-340-30

2-1


(5) Crew Member Intercom Circuits - Continued



13 Connect jumper betweentenninals H and A of testcable lB.

K501, K502 and K503 energize(relays click).

Go to step14.

Replacefaultyrelay.

NOTE

For AM-1780/VRC provided with variable gain assembly A250, the required output may beobtained by adjusting potentiometer R260. For AM-1780/VRC with fixed gain amplifierassembly A250B, no adjustment is provided.

Go to step16.

14

15


Adjust the output level of AN/URM-127 to obtain 11 to13 Vac on TS-723(*}/U.

A250-3 A250·4

NOT.E

The ME-30(*)/U is used to measure the output level of AN/URM-127.

Between 0.170 and 0.276 Vac Go to stepread on ME-30(*)/U. 24.

A250·5

A250·1 A250-2

AM-1780/VRC Test Point Lo('Uti()n.~

J512 EL9XV008

16

17

2-16

Use TS-352B/U and measure +25.5 V.dc voltage between A250-2(ground) and A250-4.

Measure de voltage between +25.5 V.J512·A and J512-E (ground).

Go to step18.

ReplaceA520.

Go to step17.

Go to2-5c(11).

TM 11-S830-340-3C


(5) Crew Member Intercom Circuits - Continued



ReplaceA250.

Repair circuitbetweenJ505-KandJ512-C.

Go to step20.

ReplaceA520.

ReplaceA250.

ReplaceA520.

ReplaceA4.

Go to step27.

Repair circuitbetweenJ512-KandJ505.

Go to step21.

Go to step22.

Go to step23.

Go to step24.

Go to step19.

EL9XV009AN/USM-281A


Same as step 21.




'ULf1fL (1 kHz signal fromAN/URM-127.)

Observe waveform atA250-1and note amplitude. .

Observe waveform at A520-Band note amplitude.

Observe waveform at J512-J.

Adjust TS-723/U to measuredistortion.

Connect TS-723 AF INPUTlead to terminals L and A oftest cable lB.

Observe waveform at A250-5.

Observe waveform at J512-K.

Use AN/USM-281A. Observewaveform at J512-C and noteamplitude.

25

24 Connect AN/USM-281A toTS-723(*)/U OSCILLOSCOPE terminals.

23

22

21

20

28

Less than 10% distortion andundistorted sine wave on AN/USM-281.

NOTE

For AM·1780NRC's with fixed gain audio amplifier A250, distortion will normally be lessthan 1%.

27 Disconnect AN/URM-127, TS-723/U, andIOO ohm resistor.

Set TS-352B/U to measureresistance RX1.

26

19

18

Repairfaultycircuit.

Go to step30.

CAUTIONTo guard against equipment damage when making measurements with power applied, makesure proper pin is selected and meter probes do not touch together.

29 Measure resistance between 0 ohms.terminals E and L of testcable 4.

Turn off power. Disconnect PPl104/G and jumper.

30

2- .

TM 11·5830·340-30


(5) Crew Member Intercom Circuits· Continued

Normal Indication Obtained?Step Instruction Indication Yes No

31 Measure continuity between oohms. If continuity is notterminals on test cable 4 and obtained, repair faultythe following points: circuit.

Terminal A and groundTerminal V and J509·UTerminal J and J503-HTerminal Nand E503

(LINE)Terminal U and E504

(LINE)Terminal M and J501-HTerminal Band J510-HTerminal J and J508-DTerminal C and J51l-C

32 Set RADIO TRANS switch toCDR & CREW.

33 Measure continuity between: oohms. Go to step Repair34. faulty

circuit.Terminal D and J504-DTerminal F and J504-F.

34 Measure resistance between Less than 200 ohms. Go to step Repairterminals C and H. 35. faulty

K501/502circuit.

35 Measure resistance between Less than 100 ohms. Go to step Repairterminal Hand J504-H. 36. faulty

K503circuit.

36 Measure resistance between Between 120 and 180 ohms. Go to step Repairterminal C and J504-H. 37. faulty

circuit.37 Set INSTALLATION switch to

OTHER.38 Measure resistance between: oohms. Go to step Repair

39. faultycircuit.

Terminal D and J501·STerminal F and J503-S.

39 Disconnect test equipment andreturn AM-1780/VRC tooperational configuration.

~-18

TM 11-5830·340·30


(6) Commander Intercom Circuits (C position of control box MONITOR switch)



Test Equipment Required

Power Supply PP·ll04/GMultimeter TS·352B/UElectronic Voltmeter ME·30/USpectrum Analyzer TS·723(*)/USignal Generator AN/URM·127Cable Assembly CG·1471/U100 ohm resistorTest cables lA and 1B (fabrication instructions

in appendix C)

12

3

4

567

8

9

Connect test cable lA to J501.Turn off PP·l104/G and con

nect positive lead to terminalC and negative lead to terminal A (ground) of test cablelA.

Turn on PP-l104/G and adjustoutput to 25.5 V.

Set AM·1780NRC switches asindicated:

MAIN PWR: NORMINSTALLATION: OTHERPOWER CKT BKR: ON

Set PWR CKT BKR to OFF.Connect test cable 1B to J504.Connect 100 ohm resistor

between terminals L and A oftest cable lB.

Connect jumper between ter·minals H and A of test cablelB.

Connect AN/URM·127 andME-30(*)/U to test cable lBas shown.

POWER indicator should light. Go to step5.

'\ l

Go to2·5c(11).

ME-30(')/U

AN/URM·127

EL9XV013

KJS07 JS06 JSOS •P/O

JSl1AM·1780 C PP·ll04/GJSOI

TEST CABLE + (2S.SVDC) -

AM·17801VRC NO.1A A

JS09

100 OHMS

Test Setup, Commander Intercom Circuits

15·723(')/U(RMS & DISTORTION)

2-1

TM 11-5830-340-30


(6) Commander Intercom Circuits - Continued



10

11

12

Connect TS-723(*)/U adjustedto measure voltage across100 ohm resistor.

Set AM-17801VRC POWERCKTBKRto ON.

Adjust AN/URM-127 outputto 1 kHz and output level toobtain 11 to 13 Vac on TS723(*)/U.

K501, K502, and K503 energize(relays click).

Between 0.170 and 0.276 Vacread on ME-30(*)/U.

Go to step12.

Go to step23.

Go to2-5c(10).

Go to step13.

NOTE

For AM-1780/VRC provided with variable gain assembly A250, the required output may beobtained by adjusting potentiometer R260. For AM-1780/VRC with fixed gain amplifierassembly A250B, no adjustment is provided.

A250·3 A250-4

A250·1

A250·5

A250-2AM-1780/VRC Test Point Locations

J512 El9XVOO8

13

14

15

2·20

Use TS-352B/U and measuredc voltage between A250-2(ground) and A250-4.


Use AN/USM-281A. Observewaveform at J512-C and noteamplitude.

+25.5 V.

+25.5 V.

(1 kHz signal fromAN/ URM-127.)

Go to step14.

ReplaceA520.

Go to step19.

Go to step15.

Go to2-5c(11).

RepaircircuitbetweenJ505-VandJ512-C.


(6) Commander Intercom Circuits - Continued

1M 11-5830-340-30


16 Observe waveform at J512-K. Amplified 1 kHz signal. Repair Go to step(Reference step 15.) circuit 17.

betweenJ512-KandJ505.

17 Observe waveform at A250-5. Attenuated 1 kHz signal. Go to step Replace(Reference step 15.) 18. A520.

18 Observe waveform at A250-1 Amplified 1 kHz signal. Go to step Replaceand note amplitude. 19. A250.

19 Observe waveform at A520-B Same as step 21. Go to step Replaceand note amplitude. 20. A520.

20 Observe waveform at J512-J. Amplitude 1 kHz signal. Go to step Replace(Reference step 22.) 21. A4.

21 Connect AN/USM-281A toTS-723(·)/U OSCILLO-SCOPE terminals. TS-723(')/U

I~ AN/USM·281A I22 Adjust TS·723/U to measure EL9XVOO9

distortion.23 Connect TS-723 AF INPUT Less than 10% distortion and Go to step Replace

lead to terminals L and A of undistorted sine wave on AN/ 25. A250.test cable 1B. USM-281.

NOTE

For AM-1780/VRC's with rlXed gain audio amplifier A250, distortion will normally be lessthan 1%.

24 Remove power, disconnect testequipment, and return AM-1780/VRC to operationalcondition.

(7) AUDIO INPUT Binding Post Circuits


1 Connect test cable 1A to J501.2 Turn offPP-1l04/G. Connect

positive lead to terminal Cand negative lead to terminalA (ground) of test cable 1A.

3 Turn on PP-1104/G and adjustoutput to 25.5 V.

4 Set AM-1780/VRC switches as POWER indicator should light. Go to step Refer toindicated: 5. 2-5c(11).

MAIN PWR: NORMINSTALLATION: OTHERPOWER CKT BKR: ON

2-~

TM 11·5830·340·30


(7) AUDIO INPUT Binding Post Circuits - Continued



PP-l104/G+ (2S.5VDC) -

NO. II


Power Supply PP-ll04/GMultimeter TS-352B/UElectronic Voltmeter ME-30/USpectrum Analyzer TS-723(*)/USignal Generator AN/URM-127Cable Assembly CG-147l/U600 ohm resistorTest cables lA and IE (fabricationinstructions in appendIX C)

PIOAM-1780

TEST CA8LENO.lA

H V• •

J50S

JSOI

600OHMS

JS06

AM·1780NRC

TS-723(')/U(RMS & DISTORTION) EL9XVOl4

Test Setup, AUDIO INPUTBinding Post Circuits

JS07

J511

ME·30I')/U

AN/URM·12717.35 VAC)

NOTE

The ME-30(*)/U is used to measure the output level of AN/URM-127.

5

6

78

9

10


Connect AN/URM-127 toAUDIO INPUT bindingposts.

Connect test cable 1B to J504.Connect 100 ohm resistor

across terminals L and A oftest cable lB.

Connect TS-723(*)/U adjustedto measure voltage across theresistor.

Adjust output of AN/URM-127to 1 kHz, and output level to7.35 V.

Between 11 and 13 V on TS723(*)/U.

Go to step16.

Go to step11.

NOTE

For AM-17801VRC provided with variable gain assembly A250, the required output may beobtained by adjusting potentiometer R260, For AM-1780/VRC with fixed gain amplifierassembly A250B, no adjustment is provided.

Z-22

TM 11-5830-340-30





A2S0·3 A2So-4 A2S0-5

A2S0·1 A2S0·2 JS12

AM-1780/VRC Test Point LocationsEL9XVOO8

11 Use TS-352B/U and measure +25.5 V. ,Go to step Go to stepdc voltage between A250-2 13. 14.(ground) and P250-4.

12 Measure dc voltage between +25.5 V. Replace Go toJ512-A and J512-E (ground). A520. 2-5c(II).

13 Use AN/URM-281A. Observe lMJl (1 kHz signal from Go to step Repairwaveform at J512-8 and note AN/URM-127.) 14. circuitamplitude. between

E502andJ512-8.

14 Observe waveform at J512-1. Attenuated 1 kHz signal. Go to step Replace(Reference step 13.) 15. A520.

15 Connect AN/USM-281A toTS-723/U OSCILLOSCOPEterminals.

AN/USM·281 A

16 Adjust TS-723/U to measure EL9XVOO9

distortion.17 Connect TS-723/U AUDIO Less than 10% distortion and Go to step Replace

INPUT leads to terminals undistorted sine wave on ANI 18. A520.L and A of test cable lB. USM-281A.

2·2

TM 11-5830-340-30




NOTE

For AM-1780/VRC's with (IXed gain audio amplifier A250, distortion will normally be lessthan 1%.

18 Disconnect the 100 ohm resistorand connect a 600 ohmresistor in its place.

19 Connect TS-723(*)/U, adjusted No less than 11 V. Go to step Replaceto measure voltage, across 20. A250.the resistor.

20 Adjust TS-723(*)/U to measure Less than 10% distortion and Go to step Replacedistortion. undistorted sine wave on AN/ 21. A520.

USM-281A.21 Turn off power, disconnect test

equipment, and returnAM-1780/VRC to operationalcondition.

(8) LINE (TEL/REMOTE) Binding Post Circuits


1 Connect test cable lA to J501.2 Turn off PP-l104/G. Connect

positive lead to terminal Cand negative lead to terminalA (ground) of test cable lA.

3 Turn on PP-l104/G and adjustoutput to +25.5 V.

4 Set AM-1780/VRC switches as POWER indicator should light. Go to step Refer toindicated: 5. 2-5c(11).

MAIN PWR: NORMINSTALLATION: OTHERPOWER CRT BRR: ON


Power Supply PP-l104/GMultimeter TS-352B/UElectronic Voltmeter ME-30/USpectrum Analyzer TS-7 23(*)/USignal Generator AN/URM-127Cable Assembly CG-147l/U100 ohm resistorTest cables lA and IB (fabrication instructionsin appendix C)

2-24

TM 11-5830-340-3(


(8) LINE (TEL/REMOTE) Binding Post Circuits - Continued



Yes No

PP·l10"/G+ (2S.SVDC) -

K•P/OAM·17BO

TEST CABLENO.IA

H V• •

TEST CABLE NO. I B

J507 J506 JSOS

ME·30(")/U JSl1

AM·1780NRC

AN/URM·127

JS09

100 OHMS

TS·723(")/U(RMS & DISTORTION) EL9XV015

Test Setup, LINE (TEL/REMOTE) Binding Post Circuits

NOTEThe ME.30(*}/U is used to measure the out·put level of AN/URM·127.

5

6

7

8

9

10

Connect ME-30(*}/U to outputof AN/URM-127.

Connect AN/URM-127 to LINE(TEL/REMOTE) bindingposts.

Connect test cable IB to J504.

Connect 100 ohm resistoracross terminals L and A oftest cable IB. .

Connect TS·723(*)/U adjustedto measure voltage across theresistor.

Adjust output of AN/URM·127 to 1 kHz, and outputlevel to 0.44 V.

Between 11 and 13 V on TS723(*}/U.

Go to step13.

Go to step11.

NOTEFor AM·1780/VRC provided with variable gain assembly A250, the required output may beobtained by adjusting potentiometer R260. For AM·1780/VRC with fixed gain amplifierassembly A250B, no adjustment is provided.

2·

TM 11·5830-340-30


(8) LINE (TEL/REMOTE) Binding Post Circuits - Continued



Use oscilloscope. Observe wave- lflfVl)l kHz signal from AN/form at J512-D and note URM-127.)amplitude.

11

12 Use oscilloscope and observewaveform at A250-5.

Attenuated 1 kHz signal fromAN/URM-127.

Go to step12.

Go to step13.

RepairfaultycircuitbetweenbindingpostsandJ512.

ReplaceA520.

A2S0-3 A2S0-4 A2S0·S

A2S0-1 A2S0·2 JS12 EL9XVOO8AM· I 780/VRC Test Point Location.~

13 Connect jumper between ter- U V on 'fS-723(*)/U. Go to step Refer tominals H and A of test cable 14. 2-5c(10).lB.

14 Disconnect jumper.15 ConnectAN/URM-127 to ter-

minals V and A of testcable lB.

16 Connect 600 ohm resistor be- oV on TS-723(*)/U. Go to step Refer totween LINE binding posts. 17. 2-5c(10).

17 Connect jumper between ter- Between 0.348 and 0.620 Vac. Go to step Refer tominals H and A of test cable 18. 2-5c(10).lB.

18 Turn off power, disconnect testequipment, and return AM-1780/VRC to operationalcondition.

2-26


(9) Retransmit Circuits

TM 11·S830·340·3C


1 Set all AM-17801VRC switchesfully counterclockwise.

2 Set TS-352B/U to measureresistance RX1.

3 Measure continuity between oohms. If continuity is notthe following points: obtained, repair the

faulty circuit.J503-S and J509-SJ503-T and J509·TJ503-U and J509-UJ503-K and J509-KJ 503-A and groundJ509-A and groundJ501-A and groundJ51l-A and groundJ501-S and J51l-SJ501-T and J51l-TJ501·U and J51l-UJ501-K and J51l-K

4 Measure resistance between Between 4960 and 7440 ohms. Go to step CheckJ509-V and ground. 5. wiring

betweenJ512-VandJ512-2.If bad,repairwiring.If wiringis good,replaceA520.

5 Turn off power, disconnect testequipment, and return AM-1780/VRC to operationalcondition.

(10) Relay Operation


1 Make the following continuity oohms. Go to step Checkchecks: 2. wil'ing

to relaysocket. Ifwiring isgood,replacerelay.

2·

1M 11-5830-340-30


(10) Relay Operation - Continued



Yes No

NOTE

The relay and relay socket pins being checked are in parentheses following the measurementpoints.


Power Supply PP-1104/GMultimeter TS-352B/UTest cable 4 (fabrication instructions inappendix C)

2

3

45

J504-V to J509-U (K503,8 and 6)

J504-J to J504-H (K501,15 and 16)

J504-K to J501-U (K503, 4and 2)

J504-M to J501-H (K501, 9and 10)

J504-B to J510-H (K501,12 and 13)

J505-K to J501-U (K502,12 and 13)

Measure resistance betweenJ505-H and J505-C (K501and K502 windings).

Measure resistance betweenJ505-H and J504-H.

Connect test cable 1A to J501.Turn offPP-ll04/G. Connect

positive lead to terminal Cand negative lead to terminalA (ground) of test cable 1A.

Less than 200 ohms.

Less than 100 ohms.

Go to step3.

Go to step4.

Replace,in tum,K501andK502.

ReplaceK503.

EL9XV016

A

PP·l104/G~f-----t + (2S.SVDC) -

H

TEST CABLENO.4

P/OAM·1780NRC

Test Setup. Relay Operation

JS03

• •J509

J510 •

KJ507 J506 J505 •P/O

AM·1780 CJ511 JSOI

TEST CABLE

AM-l 780NRC NO.1A A

2-28

c. Troubleshooting Actions· Continued

(10) Relay Operation - Continued

TM 11-5830·340·31


6 Turn onPP·1104/G and adjustoutput to 25.5 V.

7 Set AM·1780/VRC switches as POWER indicator should light. Go to step Refer toindicated: 8. 2-5c(11).

MAIN PWR: INT ONLYPOWER CKT BKR: ONRADIO TRANS: CDR &

CREWINSTALLATION: OTHER

8 Connect test cable IB to J504and test cable 4 to J505.

9 Connect jumpers between ter-minals H and A of test cablesIB and test cable 4.

CAUTIONTo g~ard against equiprnent damage when making measurements with power applied, makesure proper pin is selected and meter probes do not touch together.

10 Make the following resistance Go to step If anymeasurements to check K503: 11. check is

incorrect,replaceK503.

J504-K to J504-V oohms.J504-K to J501-U Greater than 1 megohm.J504·V to J505-V Greater than 1 megohm.

11 Make the fo~lowing resistance Go to step Hanymeasurements to check K502: 12. check is

incorrect,replaceK502.

J505·K to J501-U Greater than 1 megohm.J505-K to ground Between 120 and 180 ohms.E503 to E504 Less than 25 ohms.J505·V to J504-K oohms.

12 Make the following resistance Go to step If anymeasurements to check K501: 13. check

isincorrect,replaceK501.

J505-D to J504·D Greater than 1 megohm.J505·J to J504-J Greater than 1 megohm.J505-B to J510-H Greater than 1 megohm.J505-M to J501-H Greater than 1 megohm.J505-L to J505-E oohms.J505-L to J504-J oohms.J505-B to J505-L oohms.J505-M to J505-L oohms.

13 Remove power, disconnect testequipment, and return AM-1780/VRC to operationalcondition.

2

1M 11-5830·340-30

c. Troubleshooting Actions· Continued

(11) Power Distribution


1 Set all AM·1780/VRC switchesfully counterclockwise, PWRCKT BKR to OFF.

2 Use TS·352B/U and measure oohms. Go to step Repairresistance between J501A 3. faultyand ground. circuit.

3 Measure resistance between Infinity. Go to step RepairJ501, pin B, then pin C to 4. faultyground. circuit.

4 Set INSTALLATION switch toINTONLY.

5 Measure resistance between Infinity. Go to step RepairJ508-C and ground. 6. faulty

circuit.6 Measure continuity between oohms. 1 Go to step Repair

J508-B and J501-B. 7. faultycircuit.

7 Measure continuity between oohms. Go to step Repairthe following points (test 8. faultycables may be used to facili- circuit.tate connections):

J505-C and J506-C~

J505-C and J507·CJ505·C and J504-CJ505-C and J511-C

,

8 Measure resistance between Less than 200 ohms. Go to step RepairJ505-H and J505-C. 9. faulty

K502/K503windingcircuit.

9 Set POWER CKT BKR to ON.

NOTEThe resistance indication in steps 10 through 14 were obtained using Multimeter TS-352B/Uset to RXI scale. If any other range, or a different multimeter, is used, the resistanceindications may be different since transistors are in the circuit.

10 Measure resistance between Between 100 and 150 ohms, Go to step Go to stepJ501-B and ground, then re- and between 28 and 42 ohms 14. 11.verse leads and repeat with leads reversed.measurement.

11 Check front to back resistanceratio of Q501 and Q502 asfollows:

E toB Approximately 500 to 1. Go to step ReplaceC toB Approximately 500 to 1. 12. electricalE toC Approximately equal. assembly

A4.12 Check front to back resistance Approximately 500 to 1. Go to step Replace

ratio of CR501.I

13. electricalassemblyA4.

!-30

TM 11-5830-340-3'


(11) Power Distribution - Continued

Normal Indication Obtained?Step Instruction Indicl:\tion Yes No

13 Check front t9 back resistance Approximately 500 to 1. Go to step Replaceratio of CR502. 14. suppres-

sorassemblyAB.

14 Measure resistance between Between 100 and 150 ohms, Go to step ReplaceJ504-C and ground, then and between 36 and 54 with 15. filterreverse leads and repeat leads reversed. assemblymeasurement. A5.

15 Disconnect test equipment andreturn AM-1780/VRC tooperational condition.

C·2296NRC TROUBLESHOOTINGa. Fault Verification. Fault verification for the C·2296/VRC consists of checking the C-2296/VRC to

make sure that the problem reported by organizational maintenance exists. Thi$ is done by performing the operational check in 2-14. Also, you must perform the operational check to make sure thatyou have solved the problem.

b. Troubleshooting Actions. The following paragraphs provide tabular instructions to guide direct support maintenance personnel in fault isolation of the C-2296/VRC. Refer to the C-2296/VRCschematic diagram while troubleshooting.Before beginning to troubleshoot, remove the back cover from the C-2296/VRC by loosening fourcaptive screws. When finished troublesh()oting, apply a light coating of insulating silicone compoundto preformed packing, replace back cover and tighten four captive screws.

2

IV

iJ....,... uu

Is.61ILINEI,....

I~6-2----------------------,1

MIC AMPL A80

~

~

.tilCDCo)

oiJ~

9Co)

o

EL9XV017

NOTES:I. CIRCUIT FUNCTIONS OF J61 ARE APPLIED

THRU C-2297/VRC.2. [=::::J INDICATES EQUIPMENT MARKING.

II'NTI

561

II

I J61 (J901, C-2297/VRC) (NOTE I)

'" - - -- , ~ D INTERCOM KEYING TO AM-17801VRC

h~~sI I I ) E FIELD TELEPHONE LINE TO AM-17801VRC, C +25.5 VDC

... J AUDIO (RADIO OR INTERCOM) FROM AM-17801VRC

~YOLUMEI. / F FIELD TELEPHONE LINE TO AM-1780/VRC

R61 ~ H RADIO KEYING CONTROL TO AM-17801VRClOOK I , B +25.5 VDC FOR EXT LAMP

I '" K MIC OUTPUT (RADIO OR INTERCOM) TO AM-17801VRC

..L: I >A GROUND

T862 1 M2I 3

( >-< :H-L

1--f\[JEJI:I - IL ...J

H-Z07/VRC

I

LiI'll el ) I

-.L 11 I- T8.' J-.J- '62 __ --lI 4 Z 3 5 ~--- -- ABC 0~ _"ET" CORD l' l' -1' -1'

I I I II I__J L_,

I I, IL _~-0 EXT LAMP

C-2296/VRC. Schematic Diagram

b. Troubleshooting Actions - Continued

Step Instruction

1/ Connect test cable 5 as shown.

NormalIndication

1M 11-5830-340-30


- A- C- B

l~ f21 - 0 TEST CABLEC-2296/VRC

WH

NO.~...... J

~ H207/VRC ~j..... K~ E...... F

C·2296/VRC, Test SetupEl9XV018

2 Set the VOLUME control onthe C-2296/VRC fully clock-wise.

3 Set TS-352B/U to measureresistance RXl.

4 Make continuity readings be- oohms. If continuity is not ob-tween the terminals of the tained, repair the faultytest cable and jack as indi- circuit.cated below:

J61-A to groundJ61-B to J62-BJ61-D to J62-A

5 Set INT-RAD TRANS switch to oohms. Go to step RepairRAD TRANS and check con- 6. faultytinuity from J61-H to J62-A. circuit.

6 Connect ajumper between E61 oohms. Go to step Repairand E62 (LINE binding 7. faultyposts) and check continuity circuit.between J61-E and J61-F.

7 Remove jumper.8 Press handset switch on H-207/ Less than 15 ohms. Go to step Repair

VRC and check continuity 9. faultybetween J61-D and J61-A. circuit.

9 Set TS-352B/U to RXI000 and Greater than 10 ohms. If adverse short ischeck for adverse shorts as found, repair faultyindicated below: circuit.

J61-B to J61-AJ61-D to J61-AJ61-E to J61-AJ61-F to J61-AJ61-H to J61-A

10 Connect TS-352B/U betweenJ61-J and J61-A.

11 Rotate VOLUME control From between 0 and 35 ohms Go to step Repairthroughout its range. to between 9 and 11 ohms 12. R61

smoothly. circuit.

NOTE

In some units R61 is 100 k and terminal L is not connected: normal indication for step 11 isfrom between 0 and 35 ohms to between 90 and 110 k ohms.

12 Locate TB61. I I

2

TM 11-5830-340-30


Step Instruction

CAPTIVESCREWS

CAPTIVESCREWS

NormalIndication

EL9XV019



Power Supply PP-ll04/GMultimeter TS-352B/UElectronic Voltmeter ME-30/DSpectrum Analyzer TS-7 23 (*)/USignal Generator AN/URM-127Oscilloscope AN/USM-282150 ohm resistorTest cable 5 (fabrication instructions in

appendix C)

13

14

15

C-2296/VRC, Back Cover Removed

Connect a 150 ohm resistor toterminals K and A of testcable 5.

Turn offPP-l104/G and connect the positive lead to terminal C and the negativelead to A (ground) of testcable 5.

Connect a 150 ohm resistor tothe output of AN/URM-127.Use the ME-30(*}/U, connected across the resistor,to measure the outputsignal level of the AN/URM127.

• 150 OHMS I~AAAvvv

~ ME-30(-) -

AN/URM-127

AN/USM-281A

EL9XV020

l·34

Test Equipment Setup

Step


InstructionNormal

Indication

1M 11·5830·340-30


16 Connect AN/USM-281A to theTS-723B/U OSCILLOSCOPE terminals.

17 Connect AN/URM-127 to ter-minal30fTB61.

TB61

C-2296/VRC. TB·61 LocationEL9XV021

18 Turn on and adjust output ofPP-ll04/G to 22 Vdc.

19 Turn on and adjust output ofAN/URM-127 to 500 Hz. Setoutput signal level. to 0.007 Vas read on ME-30(*)/U.

20 Connect TS-723B/U METER Between 0.174 and 0.277 Vac. Go to step Replaceleads to terminals K and A 21. A80.(ground) of test cable 5.

21 Connect TS-723B/U AF Less than 2% distortion and Go to step ReplaceINPUT leads to terminals K undistorted sine wave on AN/ 22. A80.and A of test cable 5. USM-281.Measure distortion.

22 Adjust output of AN/URM-127to 1000 Hz at 0.007 V.

23 Connect TS-723B/U METER Between 0.174 and 0.277 Vac. Go to step Replaceleads to terminals K and A of 24. A80.test cable 5.

24 Connect TS·723B/U AF Less than 2% distortion and Go to step ReplaceINPUT leads to terminals K undistorted sine wave on AN/ 25. ABO.and A oftest cable 5. USM-281.

25 Adjust output of AN/URM-127to 3000 Hz at 0.007 V.

26 Connect TS-723B/U METER Between 0.174 and 0.277 Vac. Go to step Replaceleads to terminals K and A of 27. ABO.test cable 5.

27 Connect TS-723B/U AF Less than 2% distortion and Go to step ReplaceINPUT leads to terminals K undistorted sine wave on AN/ 28. A80.and A of test cable 5. USM-281.

28 Adjust output ofPP-ll04/G to25.5 V.

2·

TM 11-5830-340-30




30 Connect TS-723B/U AF Less than 2% distortion and Go to step ReplaceINPUT leads to terminals K undistorted sine wave on ANI 31. A80.and A of test cable 5. USM-281.

31 Adjust output of PP-ll04/G to30.0 V.


33 Connect TS-723B/U AF Less than 2% distortion and Go to step ReplaceINPUT leads to terminals K undistorted sine wave on ANI 34. A80.and A of test cable 5. USM-281.

34 Remove AN/URM-127 fromterminal 3 and connect it toterminal 5 of TB61.

35 Listen for tone in H-207/VRC 3000 Hz tone of AN/URM-127. Go to step Replaceearpiece. 36. H·2071

VRC.

36 Turn off and disconnect ANIURM-127.

37 Connect TS-723B/U METERleads to terminals K and A oftest cable 5.

38 Press push-to-talk switch on 0.004 V or greater. Go to step ReplaceH-207/VRC and talk into 39. H-207 Imouthpiece; observe indi- VRC.cation on TS-723B/U.

39 Remove power, disconnect testequipment, and returnC-2296/VRC to operationalcondition.

2-7. C-2297/VRC TROUBLESHOOTINGa. Fault Verification. Fault verification for the C-2297/VRC consists of checking the C-2297/VRC to

make sure that the problem reported by organizational maintenance exists. This is done by performing the operational check in 2-15. Also, you must perform the operational check to make sure thatyou have solved the problem.

b. Troubleshooting Actions. The following paragraphs provide tabular instructions to guide direct support maintenance personnel in fault isolation of the C-2297/VRC. Refer to FO-7, C-2297/VRCschematic diagram while troubleshooting.

Before beginning to troubleshoot, remove the back cover from the C-2297/VRC by loosening fourcaptive screws. When finished troubleshooting, apply a light coating of insulating silicone compoundto preformed packing, replace back cover and tighten four captive screws.

2-36

TM 11-5830-340-31




1 Connect the test cables asshown.

A AC 9 X9 C0 0 yH EJ F

TESTCA9LE K H TESTCA9LENo.5 E

C-2297/VRCJ NO.4

F KLhiNUV

A 8 C 0 E ABC DE

TESTCA8LENO.2

TESTCA8LENO.2

EL9XV022

C·2297/VRC, Test Setup

If continuity is not obtained, repair thefaulty circuit.

If continuity is not obtained, repair thefaulty circuit.Test Equipment Required

Power Supply PP·1104/GMultimeter TS-352B/UElectronic Voltmeter ME-30/USpectrum Analyzer TS-723(*)/USignal Generator AN/URM-127Oscilloscope AN/USM-281A150 ohm resistorTest cable 2 (fabrication instructions inappendix C)

Test cable 4 (fabrication instructions inappendix C)

Test cable 5 (fabrication instructions inappendix C)

oohms.

oohms.

Set the TS-352B/U to measur.eresistance (RX1).

Set the volume control on theC-2297/VRC fully clockwise.

Make continuity readings between the terminals of testcables connected to the jacksas indicated below:

J903-B to J902-BJ903-B to J903-EJ903-B to J902-E.

Set MONITOR switch to INTONLY and SlG-EXT-OFFswitch to EXT. Continue withcontinuity checks.

J902-C to J904-DJ903-C to J904-HJ901·C to J904-CJ901-D to J904-HJ901-E to J904-NJ901-F to J904-UJ901·J to J904-EJ901-K to J904-KJ902-C to J903-C

4

2

3

5

2-

TM 11-5830-340-30




If continuity is not ob·tained, repair faultycircuit.

If continuity is notobtained, repairfaulty circuit.

If continuity is not obtained, repairfaulty circuit.

If continuity is not ob·tained, repairfaulty circuit.

Repair/replaceVOLUMEcontrolR801.

Go to step13.

If continuity is not ob·tained, repairfaulty circuit.

oohms.

oohms.

From between 9 and 11 kohmsto between 0 and 35 ohmssmoothly.

oohms.

oohms.

oohms.Set MONITOR switch to ALLand continue continuitychecks:

J901-J to J904-LJ901-K to J904-K

Set MONITOR switch to A andcontinue continuity checks:

J901-J to J904-MJ901-K to J904·K

Set MONITOR switch to Bandcontinue continuity checks:

J901-H to J904-DJ901-J to J904-BJ901-K to J904-K

Set MONITOR switch to C andcontinue continuity checks:

J901-J to J904-JJ901-K to J904-VJ901-C to J904-F.

Set SIG-EXT-OFF switch toSIG and measure continuityfrom J901-D to J901-A.

Connect TS·352B/U to J904-Land J902-B.

Rotate VOLUME controlthroughout its range.

7

9

8

6

10

11

12

NOTE

AttachterminalL ofR801 toground.

EL9XV009

Go to step15.

TS-723B/U

I~ AN/USM-281A I

From between 9 and 11 kohmsto between 0 and 35 ohms.

Connect a 150 ohm resistor toterminals K and A of testcable 4.

ConnectAN/USM-281A tothe TS-723B/U OSCILLOSCOPE terminals.

15

In some units RB01 may be 100 k: normal indication in step 12 is from between 90 and 110kohms to between 0 and 35 ohms. Step 14 should indicate infinity. (R801 terminal L is notconnected.)

13 Connect TS-352B/U to J902-Eand J902A.

Rotate VOLUME controlthroughout its range.

14

16

2-38

TM 11-5830-340-31

b. Troubleshooting Actions· Continued



17 Connect a 150 ohm resistor tothe output of the AN/URM127, and ME-30(*)/U acrossthe resistor as shown.

NOTE

Use the ME-30(*)/U to measure the outputsignal level of the AN/URM·127 in theremainder of the procedures.

023

.. 150 OHMS IAAAvVv

'-- ME-30(')/U r--

AN/URM·127

EL9XV

18 Connect the AN/URM-127 toterminals D and A (ground)oftest cable 2 attached toJ802. Adjust the outputfrequency to 1000 Hz.

19 Adjust the AN/URM-127 out-put signal level to 0.007 V asread on the ME-30(*)/U.

20 Turn offPP-ll04/G. Connectthe positive lead to terminalC and the negative lead toterminal A of test cable 4.

21 Set the SIG-EXT-OFF switchto OFF.

22 Set the MONITOR switch toALL.

23 Turn on PP-ll04/G and adjustoutput to 22 Vdc.

24 Connect AN/URM-127 to ter-minals D and A of test cable2 connected to J902.

25 Adjust output of AN/URM-127to 500 Hz and output signallevel to 0.007 V as measuredon the ME-30(*)/U.


27 Connect TS-723B/U AF Less than 2% and undistorted Go to step ReplaceINPUT leads to terminals K sine wave on AN/USM-281A. 28. ABO.and A of test cable 4.Measure distortion.

2B Adjust AN/URM-127 outputto 1000 Hz at 0.007 V.

2-:

TM 1 1-5830-340-30




30 Connect TS-723B/U AF Less than 2% and undistorted Go to step ReplaceINPUT leads to terminals K sine wave on AN/USM-2B1A. 31. ABO.A of test cable 4. Measuredistortion.

31 Adjust AN/URM-127 output to3000 Hz at 0.007 V.


33 Connect TS-723B/U AF Less than 2% and undistorted .Go to step ReplaceINPUT leads to terminals K sine wave on AN/USM-2B1A. 34. ABO.and A of test cable 4.Measure distortion.

34 Set the PP-ll04/G to 25.5 Vdc.35 Connect the TS-723B/U Between 0.174 and 0.277 Vac. Go to step Replace

METER leads to terminals K 36. ABO.and A of test cable 4.

36 Connect the TS-723B/U AF Less than 2% and undistorted Go to step ReplaceINPUT leads to terminals K sine wave on AN/USM-2B1A. 37. ABO.and A of test cable 4.Measure distortion.

37 Set the PP-ll 04/G to 30 Vde.38 Connect the TS-723B/U Between 0.174 and 0.277 Vac. Go to step Replace

METER leads to terminals K 39. ABO.and A on test cable '1-

39 Connect the TS-723B/U AF Less than 27i and undistorted Go to step ReplaceINPUT leads to terminals K sine wave on AN/USM·2B1A. 40. A80.and A of test cable 4.Measure distortion.

40 Remove the AN/URM-127(with ME·30(*)/U and ,resis-tor) from ,J802 and connect itto terminals D and A of testcable on J803.

41 Connect the TS-723B/U Between 0.174 and 0.277 Vac. Go to step ReplaceMETER leads to terminals K 42. ABO.and A of test cable 4, recordthe reading for use in step 42to 45.

42 Connect TS·723B/U METER Same as step 41 in each position. Go to step Replace orleads to terminals K and A of 43. repairtest cable 4. Rotate faultyMONITOR switch to A, INT S901ONLY and B. circuit.

43 Set MONITOR switch to C.44 Change 150 ohm resistor con-

nection from terminal K toterminal V of test cable 4.

2·40

1M 11-5830-340-30



45 Connect TS-723B/U METER Same as step 41. Go to step Replace orleads to terminals K and A of 46. repairtest cable 4. faulty

S901circuit.

46 Remove power, disconnect testequipment, and returnC-2297/VRC to operational

Icondition.

2-8. C-2298NRC TROUBLESHOOTING

a. Fault Verification. Fault verification for the C-2298/VRC consists of checking the C-2298/VRC tomake sure that the problem reported by organizational maintenance exists. This is done by performing the operational check in 2-16. Also, you must perform the operational check to make sure thatyou have solved the problem.

b. Troubleshooting Actions. The following paragraphs provide tabular instructions to guide direct support maintenance personnel in fault isolation of the C-2298/VRC. Refer to the C-2298/VRCschematic diagram while troubleshooting.

Before beginning to troubleshoot, remove the back cover from the.C-2298/VRC by loosening fourcaptive screws. When finished troubleshooting, apply a light coating of insulating silicone compoundto preformed packing, replace back cover and tighten four captive screws.

2-.

1M 11-5830-340-30

2-9. C-1 0456/VRC TROUBLESHOOTING - Continued

a. Fault Verification. Fault verification for the C-10456/VRC consists of checking the C-I0456/VRC tomake sure that the problem reported by organizational maintenance exists. This is done by performing the operational check in 2-17. Also, you must perform the operational check to make sure thatyou have solved the problem.

b. Troubleshooting Actions. The following paragraphs provide tabular instructions to guide direct support maintenance personnel in fault isolation of the C-I0456/VRC. Refer to the C-10456/VRCschematic diagram while troubleshooting.

Before beginning to troubleshoot, remove the back cover from the C-10456/VRC by loosening fourcaptive screws. When finished troubleshooting, apply a light coating of insulating silicone compoundto preformed packing, replace back cover, and tighteu four captive screws.



1 Connect the test cables asshown.

J80Z~~,~~~~J'03

A

BC )(oEF YH TEST CABLEJ NO.4I(

LM

NUII

04

If)oCD.,

C-10456/ VRe

JeOI

NOTE~

GROUND MEASUREMENTSREQUIRED ON TEST CABLE 3MAY BE MADE FROM TEST CABLE 2

PIN A IS CHASSIS GROUND.

A

BCoEF

H

JK

LMNUV

TEST CABLENO.IA

ABC 0 E

TEST CABLENO.2

123TESTCAlLENO.3

A I CD E

TEST CABLENO.2

EL9XV027

('- J04.56/VRC, Test Setup

2

3

Set the TS·352.B/U to measureresistance RXl.

Set the VOLUME control onthe C-10456/VRC fully clockwise.

2-48

TM 11·5830·340·31



4 Make continuity reading be- oohms. If continuity is not ob-tween the terminals of test tained repair thecables connected to the jacks. faulty circuitas indicated below:

J801-A to J802-AJ801-A to J804-A Test Equipment RequiredJ801-B to J804-BJ801-C to J804-C Power Supply PP·l104/GJ801-D to J804-D Multimeter TS·352B/UJ801-F to J804-F Electronic Voltmeter ME-30/UJ801·H to J804-H Spectrum Analyzer TS·723(*)/UJ801-J to J804-J Signal Generator AN/URM-127J801·K to J804-K Oscilloscope AN/USM-281AJ801-L to J804-L 150 ohm resistorJ801-M to J804-M Test cable lA (fabrication instructions inJ801-N to J804-N appendix C)J801·U to J804·U Test cable 2 (fabrication instructions inJ801-V to J804-U appendix C)J801·E to J801-L Test cable 3 (fabrication instructions inJ804-E to J804-L appendix C)J802-B to J802-E Test cable 4 (fabrication instructions inJ802-B to J803-B appendix C)J802-D to J803-BJ802-E to J803-EJ802-C to J805-3J803-C to J805-1

5 Set MONITOR switch to ALL oto 35 ohms. Go to step Repairand measure resistance be- 6. faultytween J801-L and J802-E. circuit.

6 Set MONITOR switch to A and oto 35 ohms. Go to step Repairmeasure resistance between 7. faultyJ801-M and J802-E. circuit.

7 Set MONITOR switch to INT oto 35 ohms. Go to step RepairONLY and measure resist- 8. faultyance between J801·L and circuit.J802·E.

8 Set MONITOR switch to B oto 35 ohms. Go to step Repairand measure resistance be- 9. faultytween J801-B and J802·E. circuit.

9 Set MONITOR switch to C and oto 35 ohms. Go to step Repairmeasure resistance between 10. faultyJ801-J and J802-E. circuit.

10 Set MONITOR switch to ALL.11 Connect TS-352B/U between

terminal E of J802 and ter-minal L of J80l,

12 Rotate VOLUME control From between 9 and 11 kohms Go to step Replacethroughout its range. to between 0 and 35 ohms 13. VOL·

smoothly. UMEcontrolR80I.

2-

TM 11·5830·340.30

2-13. AM-1780/VRC MAINTENANCEa. Operational Check

This task covers the operational check of the AM-17BO/VRC.

INITIAL SETUP


Power Supply PP-ll04/GMultimeter TS-352B/UElectronic Voltmeter ME-30/USpectmm Analyzer TS-723(*)/USignal Generator AN/URM-127Cable Assembly CG-1471/U100 ohm resistor600 ohm resistorTest cable lA and lB (fabrication instructions in appendix C)Test cable 4 (fabrication instmctions in appendix C)Test cable 5 (fabrication instructions in appendix C)

Equipment Condition

Test cables, power supply, spectrum analyzer, signal generator with electronic voltmeter, and 100 ohmresistor connected as shown.

Power supply turned on and set for 25.5 Vdc.

Signal generator turned on and set for 1 kHz.

K

C

A

PIOAM·1780

TEST CABLENO.IA

JSOI

JS03

JSOSJS06

AM·1780IVRC

JS10 •• JS04 •• JS08

JS07

JS09

Hll

H V

• •

NO.IS

TS·723(")/U(RMS & DISTORTION) EL9XV007

2·56

TM 11 .. 5830·340-30

a. Operational Check .. Continued

Step Operation Normal indication COrJ.;'ective procedure

1 Set AM-1780/VRC INSTALLATION switch to OTHER, MAIN PWR to NORM, and POWERCKT EKR to ON.

POWER lamp lights.

2

Refer to troubleshootingactions,2-5c(11).

Adjust output of AN/URM-127 to obtain between 11 and 13 Vac on TS-723(*)/U. RecordTS-723(*)/U voltage.

Between 11 and 13 Vac.Refer to troubleshooting

actions, 2-5c(I).3 Read output level of AN/URM-127 on ME-30(*)/U and record it for reference.

Between 0.170 and 0.276 Vac.Refer to troubleshooting

actions,2-5c(1).

NOTEFor AM·1780/VRC provided with variable gain amplifier assembly A250, therequired output may be obtained by adjusting potentiometer R260. For AM-1780/VRC with fixed gain amplifier assembly A250B, no adjustment is provided. .

4 Adjust TS-723(*)/U to measure distortion.Less than 10% distortion.

Replace assembly A520.

56

NOTEFor AM-17801VRC with fixed gain amplifier assembly A250B, distortion will normally be less than 10%.

Set AM-1780/VRC POWER CKT BKR to OFF and readjust TS-723(*)/U to measure voltage.Connect test cable 5 to J510. Disconnect URM-127 with ME-30(*)/U from test cable 1A and con

nect it to test cable 5 as shown.

PP·ll04/G+ (25.5VDC) -

PlOAM·1780

TEST CABLENO.lA

v•H

•

TEST CABLE NO.1 B

JS03

J50l

JS05J506

AM·1780/VRC

J501

J511

J509

AN/URM.127

TS·723(")/U(RMS & DISTORTION)

El9XVO

1M 11·5830·340·30

b. Inspection of Installed Items. Do the following anytime back cover is removed from AM-1780/VRC.

(1) Inspect all sides of case for holes, dents, and gouges.

(2) Inspect inside of unit for general cleanliness.

(3) Inspect for loose or missing hardware.

(4) Inspect inside for damaged components or assemblies.

(5) Inspect for loose or broken connections.

c. Removal and Replacement

(1) Filter Assembly A·5, Old Version

REMOVAL

L Loosen eight captive screws and lift off back cover.

2. Remove three mounting screws and lift out filter assembly, A5.

MOUNTING SCREWS

MOUNTINGSCREWS

AM·1780/VRC

NOTETo replace one version ofthe filter assembly with otherversion, refir- 'to 2-13c(3).

EL9XV030

3. Use masking tape and mark which standoff(E512, E513 and E514) each lead attachesto.

4. Unsolder the leads.

REPLACEMENT

1. Solder the three leads to the properstandoffs.

2. Replace the filter assembly and tighten thethree mounting screws.

3. Apply light coatmg of insulating siliconecompound to preformed packing on back cover.

4. Replace cover and tighten eight captive screws.

(2) Filter Assembly A5, New Version E513 E514

Neu' Filter Assembly

TM 11·5830·340·30

c. Removal and Replacement - Continued

(2) Filter Assembly Af>, New Version

REMOVAL

PlO AM-/780IVRC

EL9XV032

AS

MOUNTINGSCREWS

1. Loosen eight captive screws and remove back cover.

2. Remove three mounting screws and lift out A5 assembly.

3. Use making tape and mark which standoff(E514, E515, and E516) each lead attachesto.

4. Unsolder the leads.

ES16

E:l12@{:::::::===~

Old Filt('r A.~s('mbly EL9XV033

2

1M 11-5830-340-30


(2) Filter Assembly A:"), New Version - Continued

REPLACEMENT

1. Solder the leads to proper standoffs.

2. Replace the filter assembly and tighten three mounting screws.

3. Apply a light coating of insulating silicone compound to preformed packing on back cover.

4. Replace back cover and tighten eight captive screws.

NOTETo replace the filter with one that is a different version, refer to 2-13c(3).

(3) Replacing one version of filter assembly with the other version:(a) Use 22 AWG stranded wire and prepare three 12-inch long jumper wires, 2 white-red and 1

black.(b) Remove the three wires from the defective filter.

(c) If replacement filter is old version:

• Connect a white-red jumper to E514. (E514 is connected through a brown wire toL501.)

• Connect a white-red jumper to E515. (E515 is connected through a red wire toL501.)

• Connect the black jumper wire to standoff terminal E516.

• Proceed to step (e).

E516

E512 @:{======::::;'\

Old Pilter Assembly

EL9XV033

!·66

TM 11·S830·340·3C

c. Removal and Replacement· Continued

(3) Replacing One Version of Filter Assembly with the Other Version - Continued

(d) If replacement filter is new version:

• Connect a white-red jumper to E512. (E512 is connected through a brown wire toL501.)

• Connect a white-red jumper to E513. (~513 is connected through a red wire toL501.)

• Connect the black jumper to standoff terminal E514.

• Proceed to step (e).

o E512 o

NI'U' Filter Assembly

EL9X031

(e) Install the replacement filter assembly.

(f) Run the three jumper wires along the side of chassis.

(g) Connect jumpers to same colored wires removed. from defective filter. Use spaghetti to coversolder points.

(h) Tie jumpers at convenient points along the wire form.

(i) Apply light coating of silicone insulating compound to prlilformed packing on back cover.

(j) Replace back cover and tighten eight captive screws.

(4) Assembly A520

REMOVAL

1. Loosen eight captive screws and lift off back cover.

2. Remove fou~ mounting screws.

3. Pull A520 from J512.

REPLACEMENT

1. Line up contracts on A520 with J512.

2. Gently push A520 into place.

3. Replace A520 and tighten four mounting screws.

2

TM 11·5830·340·30


(4) Assembly A520 - Continued

4. Apply light coating of insulating compound to preformed packing on back cover.


MOUNTING SCREWS

MOUNTING SCREWSEl9XV034

AM-l 780/VRC. Assembly A520 Location

(5) Heat Sink Assembly A4

REMOVAL

1. Remove A520 per 2-13c(4).

2. Use masking tape and mark four leads with their attachment point.

3. Unsolder the four leads.

4. Remove the four mounting screws and lift out the heat sink assembly.

HEAT SINKASSEMBLY

A4

EL9XV03S

MOUNTINGSCREWS

@)O'''-----"'-=1-/

AM-/7HO/VRC. Heat Sink A.~sembl."A.J

Z·68

TM 1r-5830·340·3

c. Removal and Replacement- Continued

(5) Heat Sink Assembly A4 - Continued

REPLACEMENT

1. Position the replacement heat sink assembly and tighten the four mounting screws.

2. Solder the four leads.

3. Replace A520 per 2-13c(4).

(6) Amplifier Assembly A250

REMOVAL

1. Remove A520 per 2-13c(14).

2. Loosen two A250 hole-down screws.

3. Gently pull A250 from A520.

REPLACEMENT

1. Line up A250 contacts with contacts on A520 and gently press A250 into place.

2. Tighten two hold-down screws.

3. Replace A520 per 2-13c(4).A2S0HOLD-DOWN SCREWS

@

A2S0

A520 WIRING SIDE A520 EL9XV036

(7) Relays

REMOVAL

1. Loosen eight captive screws and remove back cover.

2. Remove two hold-down screws on faulty relay.

NOTEOn AM-1780/VRC's with the latest version of filter assembly A5, the filter assembly must beremoved to gain access to K503.

3. Pull relay from its socket.

TM 11·5830-340-30


(7) Relays - Continued

REPLACEMENT

1. Check that pins on replacement relay arestraight.

2. Insert relay into its socket.


4. Apply light coating of silicone insulating compound to preformed packing on back cover.


K50J KS02 K501

AM-1780/VRC, Relay Location EL9XVOJ7

2-14. C-2296/VRC MAINTENANCEa. Operational Check

(1) Without Optional Test Box

This task covers the operational check of C-2296/VRC.

INITIAL SETUPTest Equipment Required

Power Supply PP-1l04/GSignal Generator AN/URM-127Electronic Voltmeter ME-30(*)/USpectrum Analyzer TS-723(*)/UOscilloscope AN/USM-281AMultimeter TS-352(*)/UCable Assembly CG-1471/UTest cable 5 (fabrication instructions in appendix C)150 ohm resistor, 2 watts

2·70

TM 11·5830·340·3C

a. Operational Check - Continued".

(1) Without Optional Test Box - Continued

INITIAL SETUP - ContinuedEquipment Condition

Back cover removed from C-2296/VRC.

Test cable and power supply connected to C-2296/VRC as shown.

J62

C-2296/VRC

~ H207/VRCL"- ----I

A-----~~C 22V

B +

~ TEST CABLENO.~

JKEF

PP·l104/G

EL9XV038

AN/URM-127. ME-30(*)/U. and 150 ohm resistor connected as shown.

I~ .~AAA

•v.,.,

150 OHMS II

--- ME·30(O)/U I---

AN/URM·127

AN/USM·281A

EL9XV020

Connect AN/USM-281A to TS-723(*)/U OSCILLOSCOPE terminals.

2-;

TM 11-5830-340-30

a. Operational Check - Continued


Step Operation Normal indication Corrective procedure

1 Connect 150 ohm resistor between terminals K and A of test cable 5.2 Turn on PP-l1 04/G and adjust output to 22 V.3 Connect AN/URM-127 with ME-30(*)/U and resistor to terminal 3 ofTB61 andchassis.

TB61

El9XV021

C-2296/VRC. Internal View

4 Adjust output of AN/URM-127 to 500 Hz at 0.007 V. Read AN/URM-127 output level onME-30(*)/U throughout this procedure.

5 Connect TS-723(*)/U METER leads to terminals K and A (ground) of test cable 5.Between 0.174 and 0.277 Vac.

Refer to troubleshootingactions, 2-6b.

6 Connect TS-723(*)/U AF INPUT leads to terminals K and A (ground) of test cable 5.Less than 21Jr distortion and

undistorted sine wave onAN/USM-281A.

7

8

9101112

2-72


Adjust output of AN/URM-127 to 3000 Hz at 0.007 Vac and repeat measurements in steps 5and 6.

Adjust output of AN/URM-127 to 1000 Hz at 0.007 Vac and repeat measurements in steps 5and 6.

Adjust output of PP-ll04/G to 30.0 V and repeat measurements in steps 5 and 6.Adjust output of PP·II04/G to 25.5 V and repeat measurements in steps 5 and 6.Connect output of AN/URM-127 to terminals J and A of test cable 5. . .Listen to H-207/VRC earphone while rotating C-2296/VRC VOLUME control throughout its

range.Test signal heard and no dis

tortion caused by VOLUMEcontrol.

Replace VOLUME control.

TM 11·5830·340-3(


(2) Using Optional Test Box and C-2297NRC

This task covers the operational check of the C-2296/VRC using the optional test box and C-2297/VRC.

INITIAL SETUP


Receiver-Transmitter, Radio RT-246(*)/VRCor

Receiver-Transmitter, Radio RT-524(*)/VRCMounting MT-I029/VRCCable Assembly, Power, Electrical CX-4720/VRCCable Assemby, Special Purpose, Electrical CX-4723/VRC (2 ea)Cable Assembly, RF CG-1773/UAdapter, Connector UG-201Control, Intercommunication Set C-2297/VRCPower Supply PP-l104/GWattmeter AN/URM-120Dummy Load, Electrical DA-75/UTest box (fabrication instructions in appendix C)

Equipment Condition

,Dummy antenna, wattmeter, power supply, mount, radio, C-2296/VRC, C-2297/VRC, and test box connectedas shown.

ATORMBlY

DUMMY ANTENNA

AN/URM·l20 DA·75/URECEIVER TRANSMInER --ANT I I...

0I

X·MODE

0 TEST BOXMIKE CONT

oq H

LF/VMT-l029IVRC

MT-I029IVRCL:Hf ! ONLY C-2299IVRC. CX-47:r.JIVRC CX·47?~/VRC

II HANDSET r"C·2297IVRC

ANTENNA OR 8 C·2299IVR TESTCONTROL !:.2298IVRC

CX·4722/VRC -- cX'4iiJivRC-POWER

A.lo B~HI TRANSFERCX·4720/VRC 25,5VDC 0 0 CONTROL

POWER~ C·27421VRCSOURCE FREQ

ODD EVEN CX-4723IVRC

0 0

C C-27421VRC TEST

C·2296IVRC

~:2_~)62'

CX·7621/VRC INDIC

'--{ J901 'CX·7DS8/VRC r )61 -eo "SSE

J904 J L -r " '"J903 J902''-- \

/-c-H·207IVRC

EL9XV039

2-

1M 1 1-5830-340-30


(2) Using Optional Test Box and C-2297/VRC - Continued


1 Turn on and adjust output of power supply to 25.5 V.2 Turn on receiver-transmitter. Adjust it to operate on any convenient frequency and note the low

output transmission power.3 Set receiver-transmitter SQUELCH switch to NEW OFF.4 Set C-2297/VRC SIG-EXT-OFF switch to OFF.5 Set C-2296/VRC VOLUME control to midposition.6 Press H-207/VRC push-to-talk switch several times.

Lamps on both control boxeslight each time.


7 Set C-2297/VRC SIG-EXT-OFF switch to SIG several times.Lamps on both control boxes

light each time.Refer to troubleshooting

actions, 2-6b.8 Set C·2297/VRC SIG-EXT-OFF switch to EXT.

C-2296/VRC lamp goes out andC-2297/VRC light remainslighted.


9 Set C-2297/VRC MONITOR switch to A.10 Listen to H-207/VRC earphone while rotating C-2296/VRC VOLUME control throughtout its

range.Radio rushing noise, volume

varying smoothly.Refer to troubleshooting

actions,2-6b.11 Press H-207/VRC push-to-talk switch; talk and listen for sidetone. (Intercom circuit test of

C-2296/VRC).Transmitter keyed, sidetone

heard on loudspeaker andH-207/VRC.

If transmitter keyed butno sidetone is heard,replace module ABO(2-14c(2)).lf trans-mitter is not keyed,refer to troubleshoot-,ing actions in 2-6b.

12 Hold C-2296/VRC RAD TRANS-INT switch to RAD TRANS, press H-207/VRC push-to-talkswitch, talk and listen for sidetone. (Radio circuit test of C-2296/VRC.)

Transmitter keyed, sidetoneheard on H-207/VRC.


13 Turn off power and disconnect test equipment.14 Set TS-352B/U to measure resistance RXl. Check continuity between E61 and J61-E and be-

tween E62 and J61-F.Continuity should be obtained.

Repair faulty wiring.

l-74

TM J 1-S830-340-3C


(3) Using Optional Test Box and C-2298/VRC

This task covers the operational check of the C-2296/VRC using the optional test box and a C-2298/VRC.

INITIAL SETUP

Test Equipment RequiredReceiver-Transmitter, Radio RT-246(*)/VRC

orReceiver-Transmitter, Radio RT-524(*)/VRCMounting MT-I029/VRCCable Assembly, Power, Electrical CX-4720/VRCCable Assembly, Special Purpose, Electrical CX-4723/VRC (2 ea)Cable Assembly, RF CG-1773/UAdapter, .cable assembly (fabrication instructions in appendix C)Adapter, Connector UG-201Control, Intercommunication Set C-2298/VRCPower Supply PP-l104/GWattmeter AN/URM·120Dummy Load, Electrical DA-75/UTest box (fabrication instructions in appendix C)

Equipment ConditionDummy antenna, wattmeter, power supply, mount, radio, C-2296/VRC, C-2298/VRC, and test box connectedas shown.

cx...mIVRCC-2299/VRC

TEST BOX

I

DUMMY ANTENNA

AN/URM·I20 OA 75/U

I

RECEIVER TRANSMlmR

X·MOOE 0MIKE C~T

1....,=r<=r--O-9.J..1--+-~.-...L.llP I/MT.I029IVRC,- - I 1,1' MT·l029/VRC

l-:t(~I'?~====t:=t===;;;:/}---9~~~_t---et!0NLYI.. CX·4723IVRC

C·2297IVRCOR

C'2;l98IVRC

II HANDSET ~"

25.5VDC_...;.~.;.~._"7...;.=!.O...~V...:~...~__ POWER

SOURCE

CX·..722IVRC

ANTENNA

CO~LPOWER

A·LO B·HI TRANSFERo 0 CONTROL

FREQ .. cr;> c;.27421VRC

°cr'-E8N

cx·..mIVRC

CX·...723IVRC

RADIO SETUP WITH TEST BOX

J803 J802L.J \:I L.J

C:~IYRC

C·2298~VRC ADAPTER CABLE .162 Jr h ASSEMBLY

'-----!L .JBOI .JS04" II----=-:;=:=.,---~l J61,. (SEE NOTE) h--....... \

L.------J '0)~,~,,,,,

H·207IVRC

EL9XV040

2·~

1M I 1-5830-340-30

a. Operational Check· Continued

(3) Using Optional Test Box and C-2298NRC - Continued


1 Turn on and adjust output of power supply to 25.5 V.2 Turn on receiver-transmitter, adjust it to operate on any convenient frequency, and note low out-

put transmission power.3 Set receiver-transmitter SQUELCH switch to NEW OFF.4 Rotate C-2296/VRC VOLUME control throughout its range, listen to H-207/VRC earphone.

(C-2298/VRC MONITOR switch may be in any position.)Radio rushing noise, volume

varying smoothly.

5

6


Press H-207NRC push-to-talk switch, talk and listen for sidetone.Transmitter keyed, sidetone

heard on loudspeaker and H207/VRC. (Intercom circuittest of C-2296NRC.)

If transmitter keyed butno sidetone is heard,replace module ABO(2-14c(2)). If transmitter is not keyed,refer to troubleshooting actions, 2-6b.

Hold H·207/VRC RAD TRANS-INT switch to RAD TRANS, press H-207NRC push-to-talkswitch, talk and listen for sidetone. (Radio circuit test of C-2296/VRC.)

Transmitter keyed and sidetoneheard on loudspeaker andH-207/VRC.


7 Set TS-352B/U to measure resistance, RXl. Make the following continuity checks:E61 to J61-EE62 to J61-FJ62-A to J61-DJ62-B to J61-B

Continuity should be obtained. Repair faulty wiring.

b. Inspection of Installed Items. Do the following anytime back cover is removed from C-::!296/VRC:





(5) Inspect for loose 01' broken connections.

!-76

TM 11-5830-340-30

2-14. C-2296/VRC MAINTENANCE - Continuedc. Removal and Replacement

(1) H·207/VRC

This task covers removal and replacement of H-207/VRC of the C-2296/VRC.

INITIAL SETUP

Tools

Tool Kit TS-IOO/G

Materials/Parts

Handset H-207/VRC SCDL415575Silicone compound, item 7, appendix B,Masking tape\ item 10, appendix B.

REMOVAL

1. Loosen four screws and remove back cover.

2. Loosen gland nut and two retaining nuts.

3. Use masking tape and mark five leads and their point of attachment to TB61.

4. Remove the five screws from TB61 and remove H-207/VRC and cord.

El9XV041

RETAINING NUTSC·2296/VRC, Internal V;e!l'

5. Remove gland nut and retaining hardware, noting the order of removal.

REPLACEMENT

1. Place gland nut and retaining hardware on H-207/VRC cord in the order noted during removal.

2. Attach the five leads to TB61.

3. Ensure that the rubber pad is in place on back cover.

4. Apply a light coating of silicone compound to preformed packing on back covel'.

5. Replace back cover and tighten four hold-down screws.

2-7:

1M I 1-:)830-340-30


(2) Microphone Amplifier Assembly ABO

This task covers removal and replacement of microphone amplifier assembly ABO of C-2296/VRC.

INITIAL SETUP

Tools

Tool Kit TK-I00/G

Materials/Parts

Microphone Amplifier Assembly ABOSMC415198 Silicone compound, item7, appendix B.

REMOVAL

1. Loosen four screws and remove back cover.

2. Loosen two ABO hold-down screws.

3. Carefully remove ABO from receptacle.

HOLD·DOWN SCREWS

C-2296/VRC, Internal View

RUBBERPAD ON

STUD

EL9XV042

REPLACEMENT

1. Ensure that rubber pads are attached to back cover, and stud on chassis.

2. Carefully line up pins on ABO with receptacle and press ABO into place. Tighten two hold-down screws.

3. Apply a light coating of insulating silicone compound to preformed packing on back cover.

4. Replace back covel' and tighten four screws.

2-15. C-2297/VRC MAINTENANCEa. Operational Check


This task covers the operational check of C-2297/VRC.

INITIAL SETUPTest E quipment Required

Power Supply PP-ll04/GSignal Generator AN/URM-127Electronic Voltmeter ME-30(*)/USpectrum Analyzer TS-723(*)/UOscilloscope AN/USM-2BIACable Assembly CG-1471/UTest cable lA (fabrication instructions in appendix C)Test cable 2 (2 ea) (fabrication instructions in appendix C)Test cable 5 (fabrication instructions in appendix C)Resistor, 150 ohms, 2 watts (3 each)Multimeter TS-352B/U

2-78


(1) Without Opt.ional Test Box· Continued

INITiAL SETUP - Continued

Equipment Conditions

Test cables and power supply connected to C-2297/VRC as shown.

TM 11·5830·340·30

,.... A -eA r-"'" 25.5Ve C i--o r- 8 - +e8 f- -- Ce XeO i--o r- Oe PP·l104/GeH f- -- Ee y.~ f- J9~ r!f04 ....... Fe

TEST CABLE e K i--o C-2297/VRC .- He TEST CABLE

NO.5 eE I-- L W '- Je NO.4

eF r- "-- Ke'- Le

J902LJ L..JJ903 "-- Me

'-- Ne'-- Ue

'- Ve

I " I r 1 I 1 IABC 0 E ABC 0 E

TE,ST CABLE TEST CABLE

NO.2 NO.2

EL9XV043

Connect 150 ohm resistor, AN/URM-127, and ME-30(*)/U as shown.

•• 150 OHMS •AAA¥yy

- ME-30(')/U -

AN/URM·127

AN/UsM·281 A

EL9XV020

Connect AN/USM·281A to TS-723(*)/U OSCILLOSCOPE terminals.

Connect a 150 ohm resistor between terminals K and A of test cable 1A.Turn on PP-ll04/G and set output for 25.5 V.

2·'

1M I 1-)IUO·J4U-JU




1 Set C-2297/VRC MONITOR switch to ALL and SIG-EXT-OFF switch to OFF.2 Connect AN/URM-127 to terminals D and A of test cable 2 connected to J902.3 Adjust output of AN/URM-127 to 1 kHz at O.007-Vac.4 Adjust TS-723(*)/U to measure voltage and output between terminals K and A of test cable lA.


actions, 2-7b.5 Adjust TS-723(*)/U to measure distortion and connect between terminals K and A of test cable

lA. Also observe waveform on AN/USM-28lA.Less than 2% distortion on TS-

723(*)/U and undistorted sinewave on AN/USM-281A.


6 Disconnect 150 ohm resistor from K and reconnect it to terminal V of test cable lA.7 Set MONITOR switch to C.8 Adjust TS-723(*)/U to measure voltage and output between terminals V and A of test cable lA.


actions,2-7b.9 Turn off PP-1104/G.

10 Connect 150 ohm resistor across terminals B and A of test cable 5.11 Turn on PP-1104/G.

C-2297/VRC indicator lamplights.


12 Set C-2297/VRC SIG-EXT-OFF switch to EXT.C-2297/VRC indicator lamp

lights.Refer to troubleshooting

actions,2-7b.13 Connect TS-352B/U to terminals C(+) and A (negative, ground) of test cable 5.

+25.5 V (power supply voltage).Refer to troubleshooting

actions,2-7b.14 Remove power, disconnect test equipment and return C-2297/VRC to operational condition.

2-80

TM 11-5830-340-30


(2) Using Optional Test Box and C-2296/VRC

This task covers the operational check of the C-2297/VRC using the optional test box and C-2296/VRC.

INITIAL SETUP



Receiver-Transmitter, Radio RT-524(*)/VRCMounting MT-I029/VRCCable Assembly, Power, Electrical CX-4720/VRCCable Assembly, Special Purpose, Electrical CX-4723/VRC (2 ea)Cable Assembly, RF CG-1773/UAdapter, Connector UG-201Control, Intercommunication Set C-2296/VRCPower Supply PP-l104/GWattmeter AN/URM-120Dummy Load, Electrical DA-75/UTest box (fabrication instructions in appendix C)Handset H189/GR, or similar audio accessory

Equipment Condition

Dummy antenna wattmeter, power supply, mount, radio, C-2296/VRC, C·2297/VRC, and test box connectedas shown.

CATCSEMBl

DUMMY ANTENNA

AN/URM·l:lO DA-75/URECEIVER TRANSMITIER ..

A~T I IIX·MODE 0

MIKE C~T TE5T BOX

09 0 ~ VMT-l029/VRCMT·l029/VRC

L:JLf I / ONLY C-2299/VRC, ... CX-~723/VRC CX·~723/VRC

II HANDSET r"C·22'I7/VRC

ANTENNA OR B C·2299/VR TESTCONTROl C·:l298/VRC

CX-4722/VRC -- CX·~723/VRC

POWERA·lO a·HI TRANSFER

CX·~7:lO/VRC:l5.5VDC 0 0 CONTROLPOWER

~ C·27~2/VRCSOURCE F~€9_.ODD EVEN CX-~723/VRC

0 0

C C·27~21VRC TE5T

C·2296/VRC

C·2991IVRCJ62 h CX.7621/vRC ~INDI

"-{ J904 J901 'CX-7058/VRC r J61 AS

J L~--r-",

'-- \J903 . J902 )........ 0' ........

H·:101IVRC

EL9XVO~

2-

1M 11-5830-340-30

a. Operational Check - Continued(2) Using Optional Test Box and C-2296/VRC - Continued


1 Turn on and adjust output of power supply to 25.5 V.2 Turn on receiver-transmitter, adjust it to operate on any convenient frequency; note the low out-

put transmission power.3 Set receiver-transmitter SQUELCH switch to NEW OFF.4 Set C-2297/VRC SIG-EXT-OFF switch to OFF.5 Set C-2296/VRC VOLUME control to midposition.6 Press H-207/VRC (connected to C-2296/VRC) push-to-talk switch several times.

Lamps on both control boxeslight each time.


7 Set C-2297/VRC SIG-EXT-OFF switch to SIG several times.Lamps on both control boxes

light each time.Refer to troubleshooting

actions,2-7b.8 Set C-2297/VRC SIG-EXT-OFF switch to EXT.

C-2296 lamp goes out, C-2297IVRC light remains lighted.


9 Connect handset to J903.10 Set C-2297/VRC VOLUME control to midposition.11 Set C-2297/VRC MONITOR switch to each position, in turn, and listen to handset.

Radio rushing noise should beheard at each position.


12 Listen to handset and rotate VOLUME control throughout its range.Radio rushing noise level varies

smoothly.Replace VOLUME con-

trol.13 Connect handset to J902, set MONITOR switch to each position, in turn, and listen to hand set.



14 Set MONITOR switch to ALL, press handset push-to-talk switch.Receiver-transmitter should be

keyed.Refer to troubleshooting

actions 2-7b.15 With handset push-to-talk switch operated, talk into handset and listen for sidetone.

Sidetone heard in handset andon loudspeaker.

Replace microphoneamplifier module A80(2-15d).

2-82

TM 11·5830·340·30


(2) Using Optional Test Box and C-2296/VRC - Continued

Step Opera~ion Normal indication Corrective procedme

16 Connect handset to J903 and repeat step 15 for each position of the MONITOR switch.Receiver-transmitter keyed,

sidetone heard on hangsetand loudspeaker, each position.

Refer to troubleshootingactions 2-7b.

1718

Set C·2297/VRC MONITOR switch to ALL.Press H·207/VRC (connected to C-2296/VRC) push-to-talk switch, talk into handset, and listen

for sidetone.Receiver-transmitter keyed,

sidetone heard on H·207/VRCand loudspeaker.


19 Set C·2297/VRC MONITOR switch to A.20 Hold C-2296/VRC RAD TRANS-INT switch to RAD TRANS and repeat step 18.

(3) Using Optional Test Box and C·2298/VRC

This task covers the operational check of the C-2297/VRC using the optipnal test box and a C-2298/VRC.



Receiver-Transmitter, Radio RT-524(*)/VRCMounting MT-I029/VRCCable Assembly, Power, Electrical CX-4720/VRCCable Assembly, Special Purpose, Electrical CX-4723/VRC (2 ea)Cable Assembly, RF CG-1773/UAdapter, cable assembly (fabrication instructions in appendix C)Adapter, Connector UG-201Control, Intercommunication Set C·2298/VRCPower Supply PP-l104/GWattmeter AN/URM-120Dummy Load, Electrical DA-75/UTest box (fabrication instructions in appendix C)Handset, H-189/GR, or similar audio accessory

2·8~

TM 11·5830·340·30


(:3) Using Optional Test Box and C-2298/VRC - Continued

Equipment Conditions

Dummy antenna, wattmeter, power supply, mount, radio C-2297/VRC, C-2298/VRC, and test box connectedas shown.

TEST BOX

RECEIVER TRANSMITIER

ANT

IHANDSET ~"

MT·l029/VRC

CX·4723IVRC

CX·4722/VRC

MT-l029IVRCONLY

ANTENNACONTROL

C-2299IVRC

C·2297IVRCOR

C·2JI8IVRC

CX-4.7~!VRC

B C·2299IVR TEST

CX-4723IVRC

~--~---------------

CX.4720IVRC 25.5VDC-...;;.;.;.""-""---_ POWER

SOURCE

ADAPTER CABlEASSEMBlY

(SEE NOTE)

POWERA·lO Ii·Hi TRANSFERo 0 CONTROl

FREQ ~ C·2742IVRCoDD EVENo 0

J803

CX·4723IVRC

C C·2742IVRC TEST

NOTE:TEST BOX AND CAllE lOCAllYFABRICATED.

EL9XV045


1 Turn on and output of power supply to 25.5 V.2 Turn on receiver-transmitter, adjust it to operate on any convenient frequency, and note the low

output transmission power.3 Set receiver-transmitter SQUELCH switch to NEW OFF.4 Set C-2297/VRC SIG-EXT-OFF switch to EXT.

Lamp on C-2297NRC shouldlight.


2-84

TM 11-5830-340

a. Operational Check - Continued(3) Using Optional Test Box and C-2298IYRC - Continued

Step Operation ~()nnal indication C'olTective pl'ocedme


5 Set C-2297/VRC SIG-EXT-OFF switch to SIG several times.Lamp on C-2297/VRC should

light each time.

678

9

10

11


Connect handset to J903 of C-2297/VRC.Set C-2297/VRC VOLUME control to midposition.Set C-2297/VRC MONITOR switch to each position in turn and listen to handset.


Listen to handset and rotate VOLUME control throughout its range.Radio rushing noise level varies

smoothly.Replace VOLUME con

trol.Connect handset to J902, set MONITOR switch to each position in turn and listen to handset.


Refer to troubleshootinlactions,2-7b.

Set C-2297IYRC MONITOR switch to ALL, press handset push-to-talk switch.Receiver-transmitter should be

keyed.Refer to troubleshootinl

actions,2-7b.12 With handset push-to-talk switch operated, talk into handset and listen for sidetone.

Sidetone heard in handset andon loudspeaker

Replace microphoneamplifier module A8C(2-15c).

13 Connect handset to J903 and repeat step 12 for each position of the MONITOR switch.Receiver-transmitter keyed,

sidetone heard in handset andon loudspeaker, each position.

14151617

Refer to troubleshootinactions,2-7b.

Set C-2297IYRC MONITOR switch to A (SIG-EXT-INT at EXT).Connect handset to C-2298/VRC J803.Set C-2298/vRC MONITOR switch to A.Press H-189/U push-to-talk switch, talk into handset, and listen for sidetone.

Receiver-transmitter keyed,sidetone heard on handsetand loudspeaker.

Refer to troubleshootiractions, 2-7b.

TM 11·5830·340·30

2-15. C-2297 MAINTENANCE - Continued

b. Inspection of Installed Items. Do the following anytime back cover is removed from C-2296/VRC.




(4) Inspect inside for damaged components or assemblies

(5) Inspect for loose 01' broken connections.


This task covers removal and replacement of microphone amplifier assembly ABO of C-2297/VRC.

INITIAL SETUP

Tools

Tool Kit TK-I00/G

Materials/Parts

Microphone Amplifier Assembly A80,SMC415198 Silicone compound, item7. appendix B

REMOVAL

1. Loosen four captive screws and remove back cover.

2. Loosen two A80 hold-down screws.

3. Carefully remove A80.

REPLACEMENT

1. Ensure that rubber pads are in place overstud on chassis and on back cover.

2. Carefully line up pins on ABO with receptacleand press ABO into place. Tighten two holddown screws.

3. Apply a light coating of insulating siliconecompound to preformed packing on backcover.

4. Replace back cover and tighten four screws.

HOLD·DOWNSCREWS

RUBBERPAD ONSTUD

C·2297/VRC, Internal Vieu'

16

El9XV046

TM 11-5830-340-:

2-16. C·2298/VRC MAINTENANCE

a. Operational Check


This task covers the operational check of C-2298/VRC without the optional test box.

INITIAL SETUP


Power Supply PP-l104/GSignal Generator AN/URM-127Electronic Voltmeter ME-30(*)/USpectrum Analyzer TS-723(*)/UOscilloscope AN/USM-281ACable Assembly CG-1471/UTest cables 1A and 1B (fabrication instructions in appendix C)Test cable 2 (fabrication instructions in appendix C)150 ohm resistor, 2 watts (3 each)

Equipment Condition


PP·ll04/G

A ..1-----+-1 22 VB _1-----+---4ce +oeE ef eHe TEST CABLEJ. NO.1AK.L.MeNe

U·ve

IIII\ """T""'r"T~

I I I I I

C-2298/ VRC

J804

eAeBeCeOeE

e"TEST CABLE e H

NO.18 e Jel<

e LeMeNeUeV

ABC 0 Ee • e ••

TEST CABLE

NO.2

ABC 0 E• • e ••

TEST CABU:NO.2

EL9XV04

TM 11-5830-340-30



INITIAL SETUP· Continued

Equipment Condition

Connect 150 ohm resistor AN/URM-127 and ME-30(*)/U as shown.

150 OHMS .~A. A. AV."V

---- ME-30('I/U ..--

AN/URM-127

AN/USM-28I A

EL9XV020


Connect a 150 ohm resistor between terminals K and A of test cable 1A.

Turn on PP-I104/G and set output for 22 V.


1 Set C-2298/VRC MONITOR switch to ALL.2 Connect test cable 2 to J802.3 Connect AN/URM-127 to terminals D and A of test cable 2.4 Adjust output of AN/URM-127 to 500 Hz at 0.007 V.5 Adjust TS-723(*)/U to measure voltage and measure output between terminals K and A of test

cable lA.Between 0.174 and 0.277 Vac.


6 Adjust TS-723(*)/U to measure distortion and connect between terminals K and A of test cable1A. Also observe waveform on AN/USM-281A.

Less than 211< distortion on TS723(*)/U and undistOlted sinewave on AN/USM-281A.

78

910

11

88

Refer to troubleshootingactions,2-8b.

Adjust output of AN/URM-127 to 1 kHz at 0.007 V and repeat measurements in steps 5 and 6.Adjust output of PP-11 04/G to 25.5 V and 30.0 V, in turn, and repeat measurements in steps 5

and 6.Change connection of test cable 2 to J80:l.Set MONITOR switch to A, INT ONLY and B. Repeat voltage measurement in step 5 for each

position.Disconnect 150 ohm resistor from K and reconnect it to terminal V of test cable 1A.

TM 11·5830·340·31


(1) Without Optional Test Box· Continued


12 Set MONITOR switch to C.13 Adjust TS-723(,*). to measure voltage and measure output between terminals V and A of test

cable 1A.Between 0.174 and 0.277 Vac.

Refer to troubleshootingactions, 2·8b.

14 Remove power, disconnect test equipment and return C-2298/VRC to operational condition.

(2) Using Optional Test Box

This task covers the operational check of the C·2298/VRC using the optional test box.



Receiver·Transmitter, Radio RT.524(*)/VRCMounting MT-1029/VRCCable Assembly, Power, Electrical CX·4720/VRCCable Assembly, Special Purpose, Electrical CX·4723/VRC (2 ea)Cable Assembly, RF CG-1773/UAdapter, Connector UG·201Handset H-189/GR, or similar audio accessoryPower Supply PP-ll04/GWattmeter AN/URM·120Dummy Load, Electrical DA-75/UTest box (fabrication instructions in appendix C)Multimeter TS-352B/U

Equipment Condition

Dummy antenna, wattmeter, power supply, mount, radio, C-2298/VRC, and test box connected as shown.

IRECEIVER TRANSMITTER

ANT

DUMMY ANTENNA

AN/URM·120 DA·75/U

I

TEST BOX

LOUDSPEAKERLS·454/U

II

.I

MT·l029/VRCONLY

CX·4723/VRC

ANTENNACONTROl.

o

C·2299IVRC

(Dl

C·2297IVRCOIl

C·2298/VRCC·2298/VRC

r J801 hCX.4723IVRC J804 '~

CX.4720IVRC 24.5VDC_______ POWER

SOURCE FREQoDD EVENo 0

TRANSfERCONTROl.

~ C·2742IVRC

(!)J

J803 J802.,t:r'T' _._......,

\,. --~- -I HANDSET IEL9XV04'

2·'

TM 11-5830-340-30

a. Operational Check - Continued(2) Using Optional Test Box - Continued


1 Turn on and adjust output of the power supply to 25.5 V.2 Turn on receiver-transmitter, adjust it to operate on any convenient frequency, and note the low

output transmission power.3 Set receiver-transmitter SQUELCH switch to NEW OFF.4 Set C-2298/VRC VOLUME control to midposition.5 Connect handset to J803.6 Set C-2298/VRC MONITOR switch to each position in turn and listen to handset.



7 Connect handset to J802.8 Set C-2298/VRC MONITOR switch to each position in turn and listen to handset.



9 Set C-2298/VRC MONITOR switch to ALL.10 Press handset push-to-talk switch.

Receiver-transmitter should bekeyed.


11 With handset push-to-talk switch operated, talk into handset and listen for sidetone.Sidetone heard in handset and

on loudspeaker.Replace microphone

amplifier module A80(2-16c).

12 Connect handset to J803 and repeat steps 11 and 12 for each position of MONITOR switch.Receiver-transmitter keyed, side-

tone heard on handset andloudspeaker at each position.


13 Listen to handset and rotate VOLUME control throughout its range.Radio rushing noise should

vary smoothly.Replace VOLUME con-

trol.14 Set TS-352B/U to measure resistance, RXl. Make continuity checks between J803N and J804N,

then J803U and J804U.Continuity should be obtained.

Repair faulty wiring.

b. Inspection of Installed Items. Do the following anytime back cover is removed from C-2298/VRC.






2-90

TM 11·5830·340-30

2-16. C-2298 MAINTENANCE - Continuedc. Removal and Replacement

This task covers removal and replacement of microphone amplifier assembly A80 of C-2298/VRC.

INITIAL SETUP

Tools

Tool Kit TK-IOO/G

Materials/Parts

Microphone Amplifier Assembly A80SMC415198 Silicone compound, item7, appendix B

REMOVAL

1. Loosen four captive screws and remove back cover.

2. Loosen two A80 hold-down screws.

3. Carefully remove A80.

REPLACEMENT

1. Ensure that rubber pads are in place overstud on chassis and on back cover.

2. Carefully line up pins on A80 with receptacleand press A80 into place. Tighten two holddown screws.

3. Apply a light coating of insulating siliconecompound to preformed packing on backcover.


HOLD-DOWN SCREWS

C-2298/VRC, Internal View

2-17. C-l 0456/VRC MAINTENANCEa. Operational Check


This task covers the operational check of C-I0456/VRC without the optional test box.


Power Supply PP-l104/GSignal Generator AN/URM-127Electronic Voltmeter ME-30(*)/USpectrum Analyzer TS-723(*)/UOscilloscope AN/USM-281ACable Assembly CG-1471/UTest cables lA and IB (fabrication instructions in appendix C)Test cable 2 (fabrication instructions in appendix C)150 ohm resistor, 2 watts (3 each)

2_C

TM 11·5830·340·30



INITIAL SETUP· Continued

Equipment Condition


-A f--, ,.- A- --B ~ 10- B

22 V_C ~ 10- C- +_0 r-. 10- 0-

PP·1104/0

-E I-- 10- E--." I-- J8~ hOI r-

F _

TEST CABLE - H I-- C·104S61VRC --- H _ TEST CABLE

NO.1B _J I-- L W I"- Je NO.1AeK f-- I'-- Keel f-- ~ LeeM f-- JOO3l JI 1/ IJOO2 ~ ~e

eN I-- .......... ~ NeeU ....... J80S/ ~ ueeV f-- P80S ..... ve

" I r r I I I IA 8 C 0 E ABC 0 E... -. • ••••

TEST CABLE TEST CABLENO.2 NO.2

EL9XVOS1

Connect 150 ohm resistor, AN/URM-127, and ME·30(*)/U as shown.

U 150 OHMS .~A.A.-AVvv

~ ME·30(')/U -

AN/URM·127

'--_......... AN/USM·281A

EL9XV020


Connect a 150 ohm resistor between terminals K and A of test cable 1A.

Turn on PP-l104/G and set output for 22 V.

Connect dummy plug P805 to J805.

2·92

TM 11-5830-340·3C




1 Set. C-10456/VRC MONITOR switch to ALL.2 Connect test cable 2 to J802.3 Connect AN/URM-127 to terminals D and A of test cable 2.4 Adjust output of AN/URM-127 to 500 Hz at 0.007 V.5 Adjust TS-723(*)/U to measure voltage and measure output between terminals K and A of test


6

Refer to troubleshootingactions, 2·9b.

Adjust TS-723(*)/U to measure distortion and connect between terminals K and A of testcable 1A. Also observe waveform on AN/USM-281A.

Less than 2% distortion on TS723(*)/U and undistorted sinewave on AN/USM-281A.


7 Adjust output of AN/URM-127 to 1 kHz at 0.007 V and repeat measurements in steps 5 and 6.8 Adjust output of PP-ll 04/G to 25.5 V and 30.0 V in turn and repeat measurements in steps 5

and 6.9 Change connection of test cable 2 J803.

10 Set MONITOR switch to A, INT ONLY, and B. Repeat voltage measurement in step 5 for eachposition.

11 Disconnect 150 ohm resistor from K and reconnect it to terminal V of test cable lA.12 Set MONITOR switch to C.13 Adjust TS-723(*) to measure voltage and measure output between terminals V and A of test



14 Remove power, disconnect test equipment and return C-I0456/VRC to operational condition.

(2) Using Optional Test Box

This task covers the operational check of the C-10456/VRC us,ing the optional test box.



Receiver-Transmitter, Radio RT-524(*)/VRCMounting MT-l029/VRCCable Assembly, Power, Electrical CX-4720/VRCCable Assembly, Special Purpose, Electrical CX-4723/VRC (2 ea)Cable Assembly, RF CG·1773/UAdapter, Connector UG-201Handset H-189/GR, or similar audio accessoryPower Supply PP-ll04/GWattmeter AN/URM-120Dummy Load, Electrical DA-75/UTest box (fabrication instructions in appendix C)MultimeterTS-352B/U

2·

TM 11-5830-340-30


(2) Using Optional Test Box - Continued

Equipment Condition

Dummy antenna, wattmeter, power supply, mount, radio, C-I0456/VRC, and test box connected as shown.

RECEIVER TRANSMITIER

ANT

TEST BOX

MT·l029IVRCO.NLY

CX·4723IVRC

II HANDSET r"

CX.4720/VRC 2S.SVDC------_ POWER

SOURCE

EL9XV052


1 Set TS-352B/U to measure resistance, RXl. Check continuity between pins 1 and 2 of dummyplug P805.

Continuity should be obtained. Repair dummy plug.2 Connect dummy plug P805 to J805.3 Turn on PP-l104/G and set output to 25.5 Vdc.4 Turn on receiver-transmitter, adjust it to operate on any convenient frequency, and note the low

output power.5 Set receiver-transmitter SQUELCH switch to NEW OFF.6 Connect handset to J803.7 Set C-I0456/VRC volume control to midposition.8 Set C-I0456/VRC MONITOR switch to each position in turn and listen to handset.



9 Listen to handset and rotate C-I0456/VRC VOLUME control throughout its range.Radio rushing noise level varies

smoothly.

10

-94

Connect handset to J802.

Replace VOLUME control.

TM 11·5830·340·3'


(2) Using Optional Test Box· Continued


11 Set MONITOR switch to each position in turn and listen to handset.Radio rushing noise should be

heard at each position.

12 Set MONITOR switch to ALL.13 Press handset push·to-talk switch.

Receiver-transmitter should bekeyed.


14


With handset push-to-talk switch operated, talk into handset and listen for sidetone.Sidetone should be heard on

handset and loudspeaker.Refer to troubleshooting

. actions, 2-9b.15 Connect handset to J803 and repeat steps 13 and 14 for each position of MONITOR switch.

Receiver-transmitter keyed,sidetone heard on handset, andloudspeaker at each position.

1617

Refer to trou:bleshootingactions, 2-9b.

Turn off power and disconnect C·I0456/VRC from test setup.Set TS·352B/U to measure resistance RXI. Check continuity between J803-N and J804-N, then

between J803·U and J804-U.Continuity should be obtained. Repair faulty wiring.

b. Inspection of Installed Items. Do the following anytime back cover is removed from C-I0456/VRC.







(1) Microphone Amplifier Assembly A80I

This task covers removal and replacement of microphone amplifier assembly ABO of C-I0456/VRC.

INITIAL SETUP

Tools

Tool Kit TK-I00/G

Material/Parts

Microphone Amplifier Assembly ABOSMC415198 Silicone compound, item7, appendix B

2

TM 11-5830-340-30


(1) Microphone Amplifier Assembly A80 - Continued

REMOVAL

1. Remove four screws and lift off back cover.

2. Loosen two hold-down screws.

3. Carefully remove module ABO.

REPLACEMENT

1. Ensure that robber pad is connected to studunder the ABO module and on back cover.

2. Position replacement module pins in line withthe receptacle.

3. Press module in place.


5. Apply a light coating of insulating siliconecompound to preformed packing on back covel'.


EL9XV053

C-I0456/VRC, Internal Vieu'

(2) Circuit Card Assembly AB1.

This task covers removal and replacement of circuit card assembly A81 of C-10456/VRC.

INITIAL SETUP

Tools

Tool Kit TK-100/G

Materials/Parts

Circuit Card Assembly A81B4001099 Silicone compound, item7, appendix B, Masking tape, item 10,appendix B.

REMOVAL

1. Loosen foul' screws and remove back cover.

2. Remove two nuts and washers holding AB1 in place.

3. Lift the A81 out of C-10456/VRC as far as possible.

4. Use masking tape and mark the eight leads for reconnection.

5. Unsolder the eight leads from A81 terminals.

2-96


(2) Circuit Card Assembly A8l - Continued

REPLACEMENT

1. Resolder the eight leads to the A8!terminals.

2. If necessary, tighten the two mountingscrews, then place the A8! over them.

3. Replace the two nuts and washers andtighten them.

4. Check to see that the rubber pad is attachedto the back cover.

5. Apply a light coat of insulating silicone compound to preformed packing on back cover.

6. Replace back cover and tighten four captivescrews.

TM 11-5830-340-30

NUTS AND WASHERS

C-I0466/VRC. Internal Vieu'

EL9XVO!

2.97/(2·98 blar

TM 11·5830·340·31

APPENDIX A

REFERENCES

AR 55-38 Reporting of Transportation Discrepancies in Shipments(NAVSUPINST 4610-33C; AFR 74-18; MCO P4610-19D;DLAR 4500-15).

AR 735-11-2 Reporting of Item and Packaging Discrepancies (DLAR 4140-55;NAVMATINST 4355-73A; AFR 400-54; MCO 4430 3F).

DA Pam 310-1 Consolidated Index of Army Publications and Blank Forms.DA Pam 738-750 The Army Maintenance Management System (TAMMS).DA Pam 750-10 US Army Equipment Index of Modification Work Orders.SB 11-131 Vehicular Radio Sets and Authorized Installations.SB 11-573 Painting and Preservation Supplies Available for Field Use for

Electronics Command Equipment.SB 11-624 Warning Notice for Vehicles in Which Radios Are Mounted.TB 385-4 Safety Precautions for Maintenance of Electrical/Electronic

Equipment.TB 43-0118 Field InstlUctions for Painting and Preserving Electronic Commar

Equipmf'nt Including Camouflage Pattern Painting of ElectricalEquipment Shelters.

TM 10-8400-201-23 Organizational and Direct Support Maintenance Manual: GeneralRepair Procedures for Clothing and Individual Equipment.

TM 11-5815-332-15 Operator's, Organizational, Direct Support, General SUPPOltand Depot Maintenance Manual Radio Teletypewriter SetAN/VSC-3 (NSN 5815-00-224-8130) and AN/VSC-3A (5815-0102-5916) (Reprinted W/Basic incl C1-10).

TM 11-5820-401-20-2 Organizational Maintenance Manual for Radio Sets AN/VRC-12(NSN 5820-00-223-7412), AN/YRC-43 (5820-00-223-7415),AN/VRC-44 (5820-00-223-7417), AN/VRC-45 (5820-00-223-7418), AN/VRC-46 (5820-00-223-7433), AN/VRC-47 (5820-00223-7434), AN/VRC-48 (5820-00-223-7435) and AN/VRC-49(5820-00-223-7437) (Used W/ Intercom System AN/VIC-1(V»[EE 150-JA-MMD-020/E 154-VRC-12, 431.

TM 11-5820-498-12 Operator's and Organizational Maintenance Manual Radio SetsAN/VRC-53 (NSN 5820-00-223-7467), AN/VRC-64 (5820-00-223-7475), AN/GRC-125 (5820-00-223-7411) and AN/GRC-H(5820-00-223-7473), and Amplifier Power Supply GroupsCA-3633/GRC and OA-3633A/GRC (5820-00-973-3383) (Re-printed W/Basic incl Cl-9).

TM 11-5820-667-12 Operator's and Organizational Maintenance Manual Radio SetAN/PRC-77 (NSN 5820-00-930-3724) (Including Receiver-Transmitter Radio RT-841IPRC-77) (5820-00-930-3725) (Re-printed W/Basic Incl Cl-8).

TM 11-5830-340-12 Operator's and Organizational Maintenance Manual Intercommu:cations Set AN/VIC-1 (V) Controls, Intercommunications SetC-10456/VRC (NSN 5830-01-082-0804) C-10680/VRC andAmplifier, Audio Frequency, AM-7046/VRC (Reprinted W/BaIncl Cl-3).

TM 11-5965-255-14P Operator, Organizational, Direct Support, General SUPPOlt andDepot Maintenance Repair Parts and Special Tools Lists:Loudspeaker, Permanent Magnet LS-454/U (NSN 5965-00-892-3538).

TM 11-5965-260-24P Organizational, Direct Support and General Support MaintenancRepair Parts and Special Tools Lists (Including Depot Mainte·nance Repair Parts and Special Tools) for Headset, ElectricalH-140A/U (NSN 5965-00-892-1010).

1M 11·5830·340·30

TM 11-5965-262-13

TM 11-5965-280-15

TM 11-5965-282-15

TM 11-5965-286-14

TM 11-6130·246-12

TM 11-6625-255-14

TM 11-6625-320·12

TM 11-6625-366-15

TM 11-6625-446-15

TM 11-6625-683-15

TM 11·6625-1703-15

TM 740-90-1TM 750-244-2

A-2

Organizational and Direct Support Maintenance Manual (IncludingRepair Parts and Special Tools Lists): Headset-MicrophoneH-161/U and H-161A/U (NSN 1)965-00-082-40~n and 5965-00824-4871).

Operator's Organizational, Direct Support, General Support andDepot Maintenance Manual (Including Repair Parts and SpecialTools Lists): Handset H-189/GR (NSN 5965-00-069-8886).

Organizational, Direct Support, General Support and Depot Maintenance Manual (Including Repair Parts and Special ToolsLists): Headset-Microphone Kit MK-1039/G (Reprinted W/BasicInel Cl-2).

Operator's, Organizational, Direct Support and General SupportMaintenance Manual: Headset-Microphone Kit MK-1697/G(NSN 5965-00-313-8958).

Operator's and Organizational Maintenance Manual: Power SupplyPP-1104/G (NSN 6130-00-542-6385) (With Instructions for Useas a Battery Charger). .

Operator, Organizational, Direct Support and General SupportMaintenance Manual: Spectrum Analyzer TS-723A/U,TS-723B/U, TS-723C/U and TS-723D/U (NSN 6625-00-6689418) [TO 33Al-13-170-1! (Reprinted W/Basic incl C1).

Operator and Organizational Maintenance Manual: VoltmeterME-30A/U, and Voltmeters. Electronic ME-30B/U, ME-30C/U,and ME-30E/U.

Operator's, Organizational, Direct Support, General Support andDepot Maintenance Manual: Multimeter TS-352B/U (NSN6625-00-553-0142).

Operator's, Organizational, Direct SUPPOlt. General SuPPOtt andDepot Maintenance Manual: Wattmeter AN/URM-120 (NSN6625-00-813-8430).

Operator, Organizational, Direct Support, General Support andDepot Maintenance Manual: Signal Generator AN/URM-127(NSN 6625-00-783-5965).

Operator, Organizational, Direct Support, General Support andDepot Maintenance Manual: Oscilloscope AN/USM-281A (NSN6625-00-228-2201).

Administrative Storage of Equipment.Procedures for Destruction of Electronics Materiel to Prevent

Enemy Use (Electronics Command).

TM 11-5830-340-3C

APPENDIX B

EXPENDABLE SUPPLIES AND MATERIALS LIST

Section I. INTRODUCTION

B-1. Scope

This appendix lists expendable supplies andmaterials you will need to operate and maintain the(AN/VIC-l(V). These items are authorized to you byCTA 50-970, Expendable Items (Except Medical,Class V, Repair Parts, and Heraldic Items).

B-2. Explanation of Columns

a. Column 1 - Item number. This number isassigned to the entry in the listing and is referencedin the narrative instructions to identify the material(e.g., "Use cleaning compound, item 5, app. 0").

b. Column 2 - Level. This column identifies thelowest level of maintenance that requires the listeditem.

C - Operator/Crew0- Organizational Maintenance/Aviation Unit

Maintenance

F - Direct Support Maintenance/AviationIntermediate Maintenance

H - General Support Maintenance

c. Column 3 - National Stock Number. This is theNational stock number assigned to the item; use it torequest or requisition the item.

d. Column 4 - Description. Indicates the Federalitem name and, if required, a description to identifythe item. The last line for each item indicates theFederal Supply Code for Manufacturer (FSCM) inparentheses followed by a part number.

e. Column 5 - Unit of Measure (UIM). Indicates th.measure used in performing the actual maintenancefunction. This measure is expressed by a twocharacter alphabetical abbreviation (e.g., ea, in, pr). Ifthe unit of measure differs from the unit of issue,requisition the lowest unit of issue that will satisfyyour requirements.

Section II. EXPENDABLE SUPPLIES AND MATERIALS LIST

(1) (2) (3) (4) (5)National Description Unit

Item stock ofno. Level number Part no. and FscM measure

1 F 5905-00-119-3505 Resistor, Fixed Composition: 68,000 ±lO(A eachRC07GF683K (81349)

2 F 5905-00-683-2243 Resistor, Fixed Composition: 150 ± 10(A eachRC07GF151J (81349)

3 F 5905-00-683-7721 Resistor, Fixed Composition: 100 ± 1OrA eachRC07GFI0IJ (81349)

4 F 5905-01-039-2981 Resistor, Fixed Composition: 600 ±10(A eachRC42GF601G (81349)

5 F 9150-00-145-0161 Grease, Aircraft/Instrument: 8 oz tubeMIL-G-46886/DC33LIGHT (81349/71984)

6 F 8040-01-013-0133 Silicone Sealant: 8 oz tubeDC 738RTV (71984)

7 F 6850-00-880-7616 Silicone Compound: 8 oz tubeMILS8660/DC4 (81349/71984)

8 C 6850-00-105-3084 Trichlorotrifluoroethane (81346) quart9 C 8305-00-205-3496 Cloth, Cheesecloth CCC-C-440 (81348) yard

10 F 7510-00-290-2023 Tape, Pressure Sensitive (81348) roll

B-1/{B-2 blar

TM 11·5830.340-3C

APPENDIX C

ILLUSTRATED LIST OF MANUFACTURED ITEMS

This appendix includes complete instructions for making items authorized to be manufactured or fabricated atdirect support maintenance. ..

EL9XV05:

TERMINAL BOARD DETAIL

A GROUND

8 {AUDIO8 RCIIA

US.S VDC

KEYING- A RADIO

INTERCO~ AUDIO A~-1780

KEYING - C RADiO

H ~J~I~~gN KEYING-

{AUDIO-

J C RADiO OR ReVR

K {~I~A~~g~ ;NTtIlCON

{AUDIO-ALL

L RADIOS. IfIIH"CON

M :U~~DIO

:.{FIELD TELEPHONE LINE

V{NIC AUOIO-CRADIo

TERMINAL BOAR D

CABLECONDUOTORNO. 14 Awa8TRANDED

1. NOTES:INDIVIDUAL OONTAOT8 ONTHE REOEPTAOLE CONNECTORARE CONNECTED TO LIKELETTERED TERMINALS ONTHE TERMINAL BOARD.

2. AN UNSERVICEABLE/SALVAGEDCX-4723NRC;WJTH ONECONNECTORAJ1ACHED MAYBE USED FOR TEST CABLESlA AND lB.

18-PINCONNECTOR

Tf!.~t Cables IA and lB. Fabrication Df!tai/.~

NOTEINDIVIDUAL OONTACT8 ONTHE RECEPTACLE CONNECTORARE CONNECTED TO LIKELETTERED TERMINALS ONTHE TERMINAL BOARD.

'-PIN TERMINAL BOARDCONNECTOR

U - 228/U GRoUIiO

@) ~B EARPHONE

C KEYING0D c£

NIC

E EARPHONEILouDSPEAKER

~36 INCHES~

TERM INA L 10ARD DETAIL TEST CABLE NO 2

Test Cable 2. Fabrication Details

EL9XVO!

TM 11-5830-340·30

3-PINCONNECTOR

TERMINAL BOARD

NOTES: .1. INPIVIDUAL CONTACTS ON THE

RECEPTACLE CONNECTOR ARECONNECTED TO LIKE NUMBEREDTERMINALS ON THE TERMINALBOARD.

2. SOME EARLY SETS MAY REOUIRE4- PIN LETTERED CONNECTORS.

CABLECONDUCTORNO.1" AWGSTRANDED

I'- 36 INCHES~

TEST CABLE NO.3

2

EL9XVOS7

Test Cable 3, Fabrication Details

36 INCHES -1~"-----36 INCHES

TERMINAL BOARD DETAIL

x

A GROUND

B{AUOIO B RCVR

C +25.5 VDC

D KEYING- A RADIO

E ~J~rr~~M AUDIO - 0F KEYING - C RADIO Y

H tJ~I~~gM KEYING-

{AUDIO-

.J C RADIO OR RCVR

-{MIC AUDIO-

II A RAOIO a INTERCOM

{AUDIO-ALL

L RADIOS a INTERCOM

M :Uf~%;o

N {FIELD TELEPHONE LINEUr

V{MIC AUDIOC RADIO

TERMINAL BOARD

TEST CABLE NO, 4

TERMINALS

J<s=======:::::====:====ll~c).:::{:r::Q)M AT E WITH~ 0 DC POWER SUPPLYr:U~q::fPOQ)

CABLE TERMINAL + AND-.TWO CONDUCTORNO. 14 AWGSTRANDED

CABLECONDUCTORNO. 14 AWGSTRANDED

18-PlttCONNECTOR

.,OlES;INDIVIDUAL CONTACTS ONTHE RECEPTACLE CONNECTORARE CONNECTED TO LIKELETTERED TERMINALS ONTHE TERMINAL BOARD.

!. AN UNSERVICEABLE (SALVAGED)CX·47231VRC WITH ONECONNECTOR CUT OFF MAYBE USED FOR TEST CABLE 4.AN UNSERVICEABLE (SALVAGED)CX·70S8IVRC WITH ONECONNECTOR CUT OFF MAYBE USED fOR TEST CABLE S.

Test Cable 4, Fabrication Details EL9XVOS8

-2

1-----36-INCHE.S------eI

TM 11-5830-340-3

TO C-2296/VRC:

9-"INCONNECTO"

II~~C:A:B:LE~CON..D·UC·T·OR-~-+r:(NO. 14 AViG STRANDED

A GROUND

C +25.5VDC

B +25.5VDC TO EXT LAMP

o INTERCOM KEYING - AM-I780

H RADIO KEYING

J {~~~~H~~g I~~~~COMIC {MIC AUDlOtRADIO

AND INTERCOM

:} FIELD TELEPHONE LINE

TERMINAL BOARDTUT CABLE NO. ,

Test Cable 5, Fabrication Details

Items Required for Test Box Fabrication:

Socket, relayIndicator assembly, light, indicator (4 ea)Lamp, incandescent (type MS-25237-327) (4 ea)Relay, electromagneticConnector, receptacle, electrical, 18 contacts, female (4 ea)Connector, receptacle, electrical, 9 contacts, femaleToggle switch, single pole, three positionMetal box, fabricated as shown

(10 in. wide; 12 in. long; 2lh in. deep; protective cover on bottom)

..14~----12IN.

10 IN.

El9XV05~

5935-01-139-08746120-00-882-36156240-00-155-78365945-00-823-26665935-00-133-03945935-00-892-8895

TOP AND BOTTOM

14 121N. -.I ~ tl10 IN.

I 11'· I 11,·2 SIDES 2 ENDS EX9XV(

7'e.~t Box Dimensions

TM 11·5830·340-30

1ES' lOx

'''(0000 fV[Ho 0

Test Box Fabrication Details:

Locate cable connectors, indicator lamp assemblies, and

toggle switch, approximately as shown.Use items as templates for required holes.

Stencil panel markings as shown.

Coat stenciling with clear acrylic lacquer or clear varnish.

Test Box Wiring Details:

Connect test box items as shown.

I IIndicates test box front cover marking.

All wiring is 14 AWG stranded.

Use shielded wire where indicated.

18 PINCONNECTOR

9 PINCONNECTOR

..T.IOI.....,.cOtrr!lT c·,n'NAC

"O*[AA·1.0 '·1'41o 0 ,~~~s~t...'

(l;) C."O"V'C

18 PINCONNECTOR

18 PINCONNECTOR

18 PINCONNECTOR

EL9XV061

A C J S UI""c-'·2~2"'.-=.""'1v7:R"'c'I''-I

JS02

SNO GNO

+al.1 voc 8 C +II.S VOC ]

RECD AUDIO H>t-----f-"t------+----....++-----....-+<' 'ST ACVR'

E .NTERPHONE AECD

1ST RT AADlO, 20 RCVA C ..UOIO

L IHTEAPI+DNE "NO RADIO

II ID.T A"DIO

H INTEAPHONE J' 20 AT ."010 ~~:'~O'TAL.1

xMTA KEYING S~------------+----- ...+-----...-+-<O 1ST AT 0.0

I • 1ST AT 010 "NO• I INTERPHOIII: IIIKES

MIKE ..UOIO U~--"""'1~-----_+-------..------......&-<V 10 RT A"O'O IIIKE

(ilif. CONTIlOjOI IC-2742/VRCIJIlOI JI04

SNO Ch-----------+---------~,....--""'T-< .. SHO

I,.-+<V1I10IlE,..: ..AY

~uJlI!J

, HI PWR CONTROL

II

i~CHAN S

CHAN 1

CH"N 7

CH.....

CH.... 1

I

§~CH"N 2

CH"N 4

CH"N II

CH"N •

CH"" 10

7hl Box Ass('mlJly El9XV062

~KIlOI: 5

4 ,tI ~:.....---.....-------------_+_<N LO 'WR CONTROL

lr-.

,N) I

I..>I

IIIII

IANO-.-

I 'Ll:..... ~-------------+_<II +21.5 VOCI

iANO "," ,~----+_-+''i"I

I •

+••.• VOC

[

POIIITION I 0 " : 14

ODD POSIT.ON S , ~:fJ'"...1."-----------------~81T1ON 8 J I

I

1 I

[

POlIlTlON I E11 I ;EVEN I III I

POSITION 4 H IEVDlI~~18~----------------OlllO4~

:-4

TM 11·5830·340·3

Adapter Cable Fabrication Details:

Obtain a 3·foot length of unserviceable/salvaged CX-7058/VRC, one connector attached.

Obtain a 2-foot length of unserviceable/salvaged CX-4723/VRC, one connector attached.

Splice the required wires together and solder.

CAUTION

Use care when installing resistor RI between pins Sand F of P2 to be certain that it does notshort to the center post of the connector.

Solder the resistor between pins Sand F of P2.

Cut off and tape ends of unused wires.

Cover each wire connection and wire joint with electrical insulating tape.

CX·70S8NRC CX·4723NRC

•

NOTESI. ADAPTER CABLE REQUIRED ONLY WHEN

C-2298/VRC IS USED TO TEST C-2296/VRC.2. TIE SHIELDS TOGETHER AND ATTACH TO

PIN A OF PI AND P2.3. RI NSN 5905-00-683-2243.

A

K

,co

~fT.

"J 1'1

I , T I 'I i ..I II ,,,

I~O II 0"11$ II I

: I ...I

H-J I. - I ...

I 't... I

.. l :" 'L CHOT[ II

A

coH

K

•

EL9XV063Adapter. Cable As.~emb/y

C·5/(C·6b

RECOMMENDED CHANGES TO EOUIPMENT TECHNICAL PUBLICATION~

~@IXU~v[]{]~m@ wrn®m@ WITH THIS PUBLICATION?

10 July 1975

FROM: (PAINT YQUR UNIT'S COMPLETE ADDRESS)CommanderStateside Arm~ DepotATTN: AMSTA-USStateside, N.J. 07703-5007

DATE SENT

THEN. . .jOT DOlf'{\' THE:DOPE ABOUT IT ON THISFORM. CAREFUU.Y TEAR ITOUT. FOLD IT AND DROP ITIN THE MAll..'

PUBLICATION NUMBER

TM 11-5840-340-12PUBLICATION DATE

23 Jan 74PUBLICATION TITLE

Radar Set AN/PRC-76

BE EXACT PIN-POINT WHERE IT IS IN THIS SPACE TELL WHAT IS WRONGAND WHAT SHOULD BE DONE ABOUT IT:

2-25 2-28

~

::i~

~

~c:"-

'"'"... 3-10 3-'3 3-1"~c:......,'"~f-

5-6 5-8

Recommend that the installation antenna alignment

~~~~~~~r~a~er~~~;e~h;~r~g~houttO~i~Y a 20

IFF

REASON: Experience has shown that_~~nlY a l O la.the antenna servo system is too sensitlve to windgusting in excess of 25 kno s, and has a tendency torapidly accelerate and de~ a as it hunts, causistrain to the drive train. ing is minimized byadjusting the lag to 20 witho degradation ofoperation. ~

Item 5, Function COI~ Change "2 db" to "3db."

REASON: ~stment procedure for the TRANS PO,ffFAULT in .,' aIls for a 3 db (500 watts) adjustment to Ii '" e TRANS POWER FAULT indicator.

Add new step f.1 to read, "Replace cover plate remm~p e.1. above."

RE~: To replace the cover plate.

F03 Zone C 3. On Jl-2. change "+24 VDC to "+5 VDC."

REASON: This is the output line of the 5 VDC powersupply. +24 VDC is the input voltage .

PRINTED NAME. GRADE OR TITLE. AND TELEPHONE NUMBER

SSG I. M. DeSpiritof 999-1776

PREVIOUS EDITIONSARE OBSOLETE.

P.S.--IF YOUR OUTFIT WANTS T KNOW A T YOIRECOMMENDATION MAKE A CARBON COPY OF THI~

AND GIVE IT TO YOUR HEADQUARTERS

"EVE"Sf 0" Oil "OA.. :l0:l'-2

;;:••i--- ..-- ~...

00·~

~CI•a

- IIIIIIIII,IIIIIII1II

CommanderU5.Army Comand F munlcatlons EI .ATTN- 0" Monmouth • ecfron;c. Commond

F . AMSEl-ME·MPart Monmouth, New Jersey on03-5007

--- ---DE~ARTtoIIE~T - - - - - - - r:OLD laCOF T.H£ AR'4Y - - - -~--=----- ---

RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL PUBLICATIONS

~®~~TI'oo~m@ ~~m®~® WITH THIS PUBLICATION?

THEN. .. JOT DOWN THEDOPE ABOUT IT ON THISFORM. CAREFULL Y TEARIT OUT, FOl.D IT ANDDROP IT IN THE MAIL.

FROM: (PRINT YOUR UNIT'S COMPLETE ADDRESS

DATE SENT

PUBLICATION NUMBER

TM 11-5830-340-30PUBLICATlON DATE

15 Sept 1986PUBLICATION TITlE

Intercom~~~;cat;on SetAN/VIC-ltV)

TABLE

NO.FIGURE

NO.

PARA·

GRAPHPAGE

NO.

t-_BE_EX_A..,C_T__PI_N_'PrO_IN_T_W_HTER_E_IT_IS-t IN THIS SPACE TILL WHAT IS WRONG

AND WHAT SHOULD BE DONE ABOUT IT:

PREVIOUS EDITIONS

ARE OBSOLETE

IIIIIIIIIIII PRINTED NAME GRADE OR TITLE AND TelEPHONE NUMBER

IiDA ,::~~. 2028·2

SIGN HERE

P.S.··IF YOUR OUTFIT WANTS TO KNOW ABOUT YOUR

RECOMMENDATION MAKE A CARBON COPE OF '[HISAND GIVE IT TO YOUR HEADQUARTERS,

IIEYERSE OF DA FOil ... '028·'

O,.,.ICIAL .USINESSPENALTY ,.0.. P.. IVATE USE Isoo

~OSTAGE AND ,.EES P"IDDE~ARTMENT0,. THE ARMY

DOD .II.

a:II.-;;

FOLD aACK =---------------------~

Of' THE ARMY ;o:II.-aIi...

DEPARTMENT

CommanderUS Army Communications-Electronics Command

and Fort MonmouthATIN: AMSEL·ME·MPFort Monmouth, New Jersey 07703·5007

TM 11·5830·340·30

NOTES:

I. RADIO SYSTEMS CAN CONSIST OF,,.) ONE RCVR-XMTR;(b) TWO RCVR-Xtt4TRS,(e) ONE RCVR-XMTR WITH ONE R-44ZUIlIVRC;OR(01) ONE RCVR-XItITR WITH TWO R-442l*)IVRCS.

ANY RADIO CONFIGURATION CAN 8E USED WITH ORWITHOUT RADIO-INTERCOM SYSTEM, C-ZZ"IVRCIS PROVIDED WHEN TWO RCVR -XMTRS ARE USEDIN THE RADIO SYSTE"..

2. REL'\YS K501 AND K50Z, SHOWN DEENERGIZED, AREENERGIZED WHEN ANY CREWMEMBER KEYS ON INTERCOItl.

3. (WITCH S501 IS SHOWN AT 10THERI.... MUTING 'RELAY OPERATES WHEN TRANSMIT TER IS KEYED.5. 'SOUELCH RELAY OPERATES WHEN SQUELCH SIGNAL IS RECEIVED.6. KEYING AND MIKE CIRCUITS CAN BE ANOTHER RECEIVER

TRANSMITIER (RADIO RELAY SETUP WITH MK-45&/GRC)OR RADIO/WIRE INTEGRATION (RfWl EOUIP".ENT (SUCH AS ANfGSA-n

7. ALL CIRCUITS ARE GROUNDED AT PIN A OF EACH CONNECTOR(NOT SHOWN).

8. C-ZZ98IVRCS FOR CREWIlE".BERS ARE ALSO CONNECTED TOJ505. J5D6, AND J507,

9. RESISTANCES ARE IN OH".S.10.~ INDICATES EQUIPMENT MARKING,

C-2299/VRC~OT~I

L

..,IRETRANSI [QIT]I

I S70ZR7D~1, IQHJ 150,

~III

,J70Z 7-II

I R:rOZ

>-- 150

I....

,

V

K

U

EL9XV067

Figure PO-,/. Radio Reception Circuits of AM-1780/VRC with Radio Systems and Radio-intercom Systems.

I..TO AUDIO INPUT

OF RADIO 8

., ,", "

I II I., .,

"/1 I

"

",.,I.,

r .,

V

K

_ TO AUDIO NPUTI OF RADIO A

: CX-47Z3/VRC L701

~:U

K K, I

J J

r-c:22-;8IVRC (COMMANDERlI

L mCX.4723IVRC L I ~ ~ II' I, ~ r-----O J8D3

M M~ liiiTl o (YEL) L-I I I ~ 8~

B B I I

, I ~: : I '8'0 0 E ( I ILOUDSPEAKERIJ J ~ ~ I

L[£) 8 ~ ~.. ; 'oJ '!:EARPHON£SI VOLU".E! E ~ ! - oJ .,..

ro~~ J80Z,

~-;;97fVRC (DRIVER) ICX'47Z3IVRC I ~ IMONITORI I ~ _ ........---,

LmL [!] S90Z ~ I C-2296/VRC IM I ' M~' ~ J901 IVOLUMEI I

I ,rr- l2i!ill o ~ J ~(----~~ J~618 B~ [E!] I lOOK

J ' I J~ S903 I I .... I

I I E~~PHON~D~F II ~Z07/V~

J9031 ~EARPHONES (OUTSIDE-VEHICLE)

IVOLU".E'<..-__..I....YE....,L-<l B '.,R90Z clOOK I I I

E ( ... - J ....

B~E (->---I LOUDSPEAKERI

~ *

J

AM-17eO/VRC

K,K501 (NOTE ZI

J506,, ,9

IlJ507.,H'

I'r

10"

,J >-'-- NC ,

0 II

,C:J ~R525 I R530150 , 6,200,

.... ,I I

I III,I

R53Z05BIVRC J510 I 6,Zoo

KI

I, , 12 IH,I ~ ,3, I

J)-J--- NC R523 I150

I 14

.... II

III II

I I

I,I

I, J504.,

723IVRC J503I

K' I'/ , ,~,H'

I 15 - Ii''/ S501 16I I 'IINSTALLATIONI

J >-,--NC: IRETRANSI I17

, 0 [OTHERI

(NOTE3)1~ I

I O~'fY III,

I II J511,

I I

I ----'<,J50J616/VRC I

J50BI

C rI

I II I

0'rI I

I I ,J >-,--NC I +FROM INTERCOM

,I

II TRANS~ INTERPHDNE ~ --L..(I AMPLIFIER

II lQITJ

I R529 18I 0 6,Zoo

~RY

0--- S503I mgl §] ....

R I~16

I 150 ACCENT K5DZR5ZZ (NOTE Z)Z4K,

~R531

INPUT 200K

MUTINGRELAY

(NOTE 4)

R-44Z(*)/VRC (RCVR e)

RCVR-XMTR (RADIO A)

1

B

I

E B-----E Jt

n

_-_1' ~---rI L... - - - - --L _

~ ":"

E B

1-----iTO KEYING TO MIKE

CKTS CKTS

I r;:-- -~ CX- 47231VRC

K >, nXED AUDIO < Kill' CONTROLLED i

~==--jI>------1P---....--...,.--~~ S>I /lUDIO ; <H I, I I

""":-......I..~ F>I M~TED AUDIO I <J

I ~'O~9/~

I r:-- - --:JJI4 FIXED AUDIO JIZ CX-7

K >, cdNTROLLED ' <KillI "AUDIO' I

~-D_------_>__-.....--_+4S) I 1< HI _ I I

"oZ:.......J~ F >' MOTED AUDIO I ( J

I ~'8.:?IV~

RCVR-XMTR (RADIO e) I r--~ CX-4

...-----------------....,.~K )Z14

FIXED AUDIOJ

, ( Kffi' CONTROLLED , ,

~----{>---_--_1~-........>---_t~ S ) , AUDIO I <H

MUTING I I IRELAY _~--'-.>o. F ) I MUTED AUDIO ! ( J

(NOTE 4) I ~'O=,/V~,B - ISPKRI - E J~u __~

E B

1-----fTO KEYING TO MIKE

CKTS CKTS ,

(NOTE 6)

SOUELCHRELAYK5OO2

(NOTE 5)

L_

r R-442(*)/VRC (RCVR C) I r- - ---::l CX-7

......-----------------~ K )': FIXED AUDIO ~I( KillI CONTROLLED I I

~_D'"""1>--------........>---_..--_+~S ) I AUDIO I ( H

I~ MUTING I I I

C '~~'~ __ Jr:=~B rE , AUXI~:::l

_~_~_--... --_ I R~~gl~EI AUDIO

I OUTPUT1:L~

/'----------- RADIO SYSTEMS --------------.., /'---------------------- RADIO/INTERCOM SYSTEM-------------------------.."~ (NOTEII" (NOTE I)

FP-7/(FP-8 blank)

TM 11-5830-340-30

NOTES:I. UNLESS OTHERWIS[ INDICAT[D

RESISTANC[S AA£ IN OHMS.Z. c::::::J INOICAT£S £QUIPM[NT

"ARKING.3. SWITCH S90I SHOWN AT R!!J;

SWITCH S90Z SHOWN AT 1!llJ.

1-------------------+------------------1I ; I

I 6 ::~~ : [i!if~N~] I00

'I ~ .1\-2 ' [ill] II\) ";--.1 12 '

I il II I II I

j ~ ~~";'I';;'O_., ITO J'05..J506I.QR J'07I I: j ....... ~~ ON A.. -I,BO/V",-J90l ,1 9 J904"D>-;---+-+., r-----+-..:..I--+--------i'------., ~- REAR N} TELEPHONE LINE BETWEEN[H'---~ 15901 I ,...- 4 ~8:--...... '----4--eU t-2296 a A"-178OCHf----+-+-f------+I~~ I \ I "-----I-("E INTERCOM AUDIO FRO" A"-1780

~J : 12.. I: ! I 5 6 ~7__..... '------f-(.... UNMUTED AUDIO FROM A RADIO2 _ I L------+-<L MUTED AUDIO FROM ALL RADIOS a INTERCOM

r--~==~===~~-~T-~~------~~======~"H ~TE~~K~I~roAM-~80~~IL_ _ - _ 9 II "IC ~PL A80 L.rj1~.....r7'1------++--------4_<~B UNMUTED AUDIO FROM 8 RCV~.. .----- -- g L2J ~ '-------:':"'--<HV Mit ~PUT TO C RADIOA)-&--, - - -J i 1 L------ex---11--<1C flIlC INPUT TO AfllI-I780IINTERCOM)a A RADIO

II ~ t· - t- l 0 ~ - ......-------------t-.......-<f KEYING CONTROL TO C RADIO~ ! ~ ~ '---.-----------1---<"J UNMUTED AUDIO fRO.. t RADIO OR ACVR

5 6 59018 .......: 2 .... c. ,.------+-.....-<·D KEYING CONTROL TO A RADIO, R[AR T8901 y- yo ~ ,..- -+__-<" C +25.5 YDC

I. 6 ~l...< A GROUND

-~ ~ .....-_1 r:ONT -:~ II I

j15902 _1__:-", Q II, IMONITORJ ~ I

, S9OIA os 901 J

IR[AA 10Ff J .. r"'\; 'II[ulz ~1O!-~---.~--~-....:J1W~__4--.....---......-----------J

, ~1 .~; _ >' I

I, - .~ ~'1'--J >= !~ IVOLU.,t: I

[ = '50 i ..~i -=--r--~· -~ ~ «I» ~.!~ __.J

• • CD • .c:--i ji IL....-i ~~:PHONEI LOUDSPEAKER

KEYINGSW~

TO.lGIONC-22M/vRt

INTERCOM K('tIftG fROM C-2296/VACfnD TU£PHDN£ liNt: fROM C-2296'VAC

+25.5V TO C-22961VACAUDtC) CRADIO OR INT£ACOM) TO C-22961VAC

f&£LD T£l.[PMONE LIft[ fROM C-2296IVACRAllO IC[YlNG cc.TROL FROM C-Z~VAC

+2S.SVDC TO C-ZnGlVAC (XT .l.AMPMIC INPU1' fROM C-Z29GI"VAC

SROUND

El9XV070

Figure FO-7. C-2297/VRC, Schematic Diagram.

FP-13/(FP-14 blank)

TM 11-5830-340-30

AMPLIFIER AUDIO FREQUENCY AM-7046/VRC

NOTES

5503SS04

7.SWITCH

IssollIS502 1

2876SDF9 ABEJ4310KLHC

I. UNLESS OTHERWISE STATED RESISTANCES ARE IN OHMS, AND CAPACITANCES ARE INMICROMICROFARADS.

2. CASE OF OS02 IS GRQUND.3. RELAYS SHOWN DEEN'ERGIZED; K502 AND KS03, ENERGIZED WHEN ANY CREWMEMBER

(JS05, J506. J507) KEYS ON INTERCOM; K50l, K502, K503 ENERGIZED WHENCOMMANDER (J504,K,EYS ON INTERCOM.

4. c:::::l INDICATES EQUIPMENT MARKING.

5. SUPPRESSOR ASSEMBLY. CREWMEMBER BOXES6. LAYOUT OF

AMPLIFIER (C-I06801VRC)

RECEPTACLES. I ~I t 504J""" J~ J50I" RCVR

~ 00IVV XMTR "A"C-2299/VRC (RT-S241

t J509 JS03" RCVRI' XMTR"""

(VRC-64)

I I INPUT :...- IIL q JII 2 354 I I

I C522 IR534 220UF I

I Ri2~S 220 IOUT r F'ii:TER I IN

C525 CRS21 CS24 L---.....=:~L-.!LS2.!.._J'--.....

I .IUF IN64S .IUF IR523 R524I 150 6200 I

I - II - ~~~ ~~~ I

I R530 RS32 I6200 6200 I

I R528100 R533 RS22 I

- ISO - 24K

I RI~ II I~ _J

RCVR CMDA 2nd R4'l2XMTR"" BOX(VRG64) (C-I06 8OIVRC)

J501(J22)~ E

-t< L

•---r< M

i---r< N

S RADIO "A" KEYING IGND)-i

Cf+25.5 WC (RADIOMOUNT LINK)

- I <B t2S.S VOC, COMMON

~ J"I K RADIO Y FIXED AUDIO

1< R1< F

. i I ( P

V

'I~ o RADIO "A" POWER RELAYCONTROL

IU RADIO"/( MIC

I H RADIO "A" EARPHONESI

! A GNDI T RADIO "A" RETRANS

'\~~CONTROL

J1Ol)T RADIO A RETRANS

CONTROL- K RADIO"A" FIXED AUDIOy v.L RADIO A KEYING

·1 1 RETRANS, !l

S RADIO"tt KEYING.. U RADIO "A" MIC, or I C +25.5 VOC.:J 1 A GND

~ 'I---+< EJ~ M;~ N! --r< J

----to< H

-+< R

--t< F

--r< B

---t< P

--r< D-4( V

(Jl2) I J5101

IK RADIO"B-FIXED AUDIO

:7i- H< C

H RADIO V VARIABLEAUDIO

5~1 - f-+< B,C.D.E,F.G.J8 I .-M-< l., ",M,P, R.T, V6 ~I I .J:,.

, A GNDI I

71 IK503B a 1< S RADIO"a" KEYING

3 I(U RADIO"fJ' MIC .

I

7 I

8 I

4

6~I I

/K503A3

I

IpOWERl

If --~~DS5Ol INORMI }IItNTONLYI

IN3326B rr~ I l8 ~_---lCR502 '1 L '!> ,~, r L.~ __ J I VSF=504:::::-;~).:---"\

7~~-H-I+.-4~

I t '-= - - --. R504 I REAR"'LJI_:='" _ C8501 ~ I, IOFF I

~ (Qffi I (NOTEI &t'o--.....:.....~-++-~

C===~I"Hrttt-;:::::~~:"-~ -.:::_~..J 'MAIN IIpWR CKT BKR I PWR

SAME AS J505

i' 19I 20I 15~ i6I 171 12

~ 13I 14I 9

~I I

E

i

.j!

II

5 ,..

~

IJ5I2

ITO

(A520)

9 I

.~0i·~t I~~---------iv 0502 I

Lf-H------,.------++~-----~+.._1-+_+_+-t_~E:::5:.:..:1I--....::::=========::::;---t--t--t--i--t-, OSOI JAN2N3740 I

rr:;:=======:!:;f~=F*i=f~~FF:f:========$==:f=f=l~lr,-lll WHT2N2.~ F¥--1_iII:i I I ,. CRSOll\Y r++-II+-.......---1t-<I ~ ! IN3995A Ii E502 ESOI L---+---+-+-i---j~+--+-+----':==~----JYEL I

LJ:~I~A~UD=IO=IN=PU=T=I========f===F:F=F,-ttL.=-='-tR:E:..D=-=i-- - - - - - -.J6

I 7I1",-~8_+ .....

3

II

1"....,19I1&.....0 20I 12

~13~ "14

~u: II

~......... ~4I 5I 18

.+-------,I •.•I <:502 T.JH!' - LJHI. II

IOOUF 1501 "l1 I130Wi C501 I

L I~

-

. ii

12I'TAClE

I I

~,l-ikG - - -lj;-'±-l+n- ~~"*A-·t- 1- ~ [""*F J DCA JS06 N U E M L H B V K F J DCA J507 C 0 J F K V B H L M E UNA J504

!i 2 !i U ~ (J80I, I CJ8OI. II CDR J801:;:: 0 _ g Cl J804) J804) OR J804)~:)>- I~ : ~ :i '-------rl-----

I...-----,------~Z~N~ SAME AS J50S0..a::~z

r---~)

110FFI I IiNTl____~~U_!_ltt:t-__o-I---_2 ~~

~ ~ ~SS03AREAR

L

~T;-

El9XV069

Figure FO~6. Amplifier, Audio Frequency AM-7046NRC Schematic Diagram (used with C-10680/VRC in Interim Fire Support Test Vehicle Mll3Al IFIS7').

FP-11 /(FP-12 blank)

'"I I

-1- - 1-':"~-ikG 1- 1- r-~i -r.l±nN U E M L 'H B V K'~ .I DCA -01506 N UE M L H B V K F .I D C AI 01507Ol!) ~ 0 0 C> 000 C> 0 0 0 0 (01801. (01801.

i~l~gi~gi~~g~~~ 018041 0180·~ ~ C(~1&1 C(~@)I&I c( 1&1 ~ LI -. _

ZI&l~~1&1 ¥ ¥~ IQOzc( Z ~~~No ~ 0 0 0 SAME AS 01505: ~~ ~ X

l1.

-rf

5

I

-

I

J~2

TOI (A5201

9 I

K5022

II

~J:. II

t.-2......... 4I 5II 18

.+-------,I AU

I C502 l.JHI' - 4HII III 100UF L501 CSOII 130Wt IOOUF IL =.J

II:1&1~Z

riNTl~

IIIIII

01505(01801.018041

I INSTALLATION

3

01508 (RCVR)

~J22~ ~iS -

;>-4~~N~

:fl~LL~~H HI-----I-+-4-JA)>----l....._

RCVR"c" FIXED AUDIO C)--,r-------JB>-6--------'

RCVR'C'UNMUTED AUDIO D>-I-------JGND A»--'----....04-

,J509

(017021

RADIO·C"KEYING-RETRANS L )-!::...--.......-+JRADIO'C' VARIABLE AUDIO V Hr-l-~-++-+-+-J

RADIO ·c· KEYING S >-44--+--f.....RADIO··C· FIXED AUDIO K)-l+-~

E >-; ~M><l: ~

N>of fJ~ fH )-4.' fR).;: , f-F>- f-

~t: f-c,-- ,....P >-f-I- l~ >->-4-+I-----jK-!:!::!f::!-~I=IN=T::::ON=LY~I 6 \ IRETRANS I~).JL= IOTHERI~~2~

li~gJ- ~3

IRETRANSI

RADIO 'CO VARIABLE AUDIOGND

RADIO "C"MICRADIO 'CO RETRANS CONTROL

GND

RADIO "CO RETRANS CONTROLRADIO "C·MIC

RADIO ·C" KEYINGRADIO ·C· FIXED AUDIO

@] iii ~

CREW RECEPTACLE

1M 11-5830-340-30

FROM ...25VDCPOWER SOURCE

RECEIVEDRADIOSIGNALS

AM-1780/ VRC

220220

_ _ - - - - -- --~ TO FlELD503 --- - - - TELEPHONE

NOTE 4).... .. ./r f

ITEL/REMOTE].... . ----------------+(,-- ---------.. / R502..

504 11 I 5.600

I NOTt 6 - _ T501

~dl 4

II II

: 12 ' ,.

, ,'.

I~

.+ 14I

~I

3

1I

R503 IR521

>--t- .{ 1504

',..".. + 51.600

I,

I 8I I ,

9I R528

I,10' 100

I" ,+ II ~I 1

I I 18:: I, 1 fl 19 1I.. I i+ 20,

I 12 R521

~I 12K

I ~ 13 1

( I J ,+ 14

~ I : 15 r,NTERPHONEl..~ : I.' 16~ 1 A1.PLlFIER I.. - + 11

n. -

.. .,

R524 R5234 6.200 150

.... J504 2 J, I 'It 5

I 1B

I r.... I 6,r, 1 l:+ I

I.... ! 1rt- I ~ L[}-..

I l' ,...K!S03 CR~~I K501 K502

I IN64,~.... ,

H- -L \NOTE 5)

;;::::C524 /1""- C525

( .IUF .IUFI

( I : R534 R~3~..

H

V

K

K

J505. J506.0RJ~1(NOTE 31

N

u

v

H

L..E

BJ

L..E

B

J

)AN

CX-4123/VRC

CX-70GO!VRCH

/ ~ ....

"' I 1 'I II I, I I ..

"' I I 'I I, I I ....

"' II ..I

I I "-, I ~

I (

, (

I-(..

, ,. ..~! ,0 I '

....

'I I7

I J

I I

III

I rI II II

1I

I, I F , .."' I I 'I

I II b~I II I

/ I M 1 "-.. I I

,I II B I ..I A

. ,I ....

• G I :I

J I ~

~,

-4

H

L

M

E

BJ

K

V

H

K

L

M

E

8

J

-lJ904 <

1 N

I <UI

•

S902 r-< A <:--------_...

> I • II • I, I,

II 1

I I II

I1 I

> I 0I , I, I

>I ~ I

II ,

r-.../ '1..J902 A80 I I.. T '2"4 I

~ I.... ,

I I I, ,I I.. I

f'! I' I0 I

.. i 1 <, I0, I

II 0 0 IJ903 I lilll I I

..(YEL) ,.J I!J I <' T l ...IVoLUMEI 0 I.. I UNT ON41, T 0 I (-i'olll.. I I <,

I tl'J I (.. .IMONITOR I,8

C

C

I E

D

(TYPICAL AUDIO ACCESSORIES ARE ASSHOWN CONNECTEDTO C-2298/VRC 8ELOW.)

I

LAUDIO ACCESSORIES -1 L -C-2298/VRC CREW C..O_M_M_A_N_D...E.R_'-------r-<IJ801

J802 A80 ~ IMIKE D---~) D + '

I I 2 4 I~8 ,0 (V

HEADSET6-b )1 E I I II ' ..... 0r...-----~) C '

I IJ803 : 0 1---------~) E (YEL) L

I I IVOLUMEIMIKE D---~) D >--i--I--'

':'~:-" ..._ ): C

c- H_EA_D_.E~0~ • i:~:~:_':.::-------I_M_Os_N80_IT_IO_R_1-----u

---l '90' C-2201lVRe (NOTE 31

J~' ( E ~(--'-I ~) E >>-J...,~...O_I-- ~0'1• @!!I

--,...1 ...c< F t-(-'..., -+-~> F > : J-; IEXTI, I 1--:L......( D ~(........l-----I--)~ D I, I, I

ANSi' ,I I,. I

-~:-« I< ~(--:,:----......I.-~) K

o I I "_--..L.1 -« J t-(.........' ..L-~) J

~I

I-I:I I E

EL9XV068

Figure FO-S. Intercom Transm~9sion and Reception ofAM-1780/VRC and Crewmember Control Boxes.

FP-9/(FP-10 blank)

C-2296/VRC (OUTSIDE VEHICLE)

J902

(TYPICAL AUDIO AC- CCESSORIES ARE ASSHOWN CONNECTEDTO C-2298/VRC BE-

J903LOW.) (YELlI E

DI

LC

B

TYPICAL AUDIO ACCESSORIES -1MIKE D---.....) D >-J_80...2 --

~~ B I>--I~HEADSET6-b .,1 E I~___

(KEY RADIO) '- ~ I IPUSH-TO-TALK -I~D"--------......) C >--~............--

I IJ803'--- ..~ E (YEL)ILOUDSPEAKERI- 7 >--r--~~---

MIKE D~----4.,1 0 l>--ll~..--'- I I

(KEY INTERCOM) .a "-0...----------.) C ~....-.........PUSH-TO-TALK-=~ ,..... I I

r HEADSET c5 b )1 B ,.............

____ -------.J I~_

-l... ~g.2 -_-_J'6,../.....( E ..( ...... --....__.) E >]l-J......~,...O_I _

Eli ILINEI I... - - - -0 f (F ...(.....------t~) F »)1-.......---__

IINTI ,....----....: -e( D ( ) D )11--.- _

~"="~..........------.....{ 561 :

IRAD TRANSI

Ei2A80~4 :D-\.........-, ~,-----...r....c:( K ...(--:------.1.......) k )11-.......---0] IVOLUMEI I I · IL J I <J ...(.....I~_----..) J )

_----'RA~I-I:

I EI

H-207/VRC

TO FIELDTELEPHONE

(NOTE 4)

PUSH-TO-TALK

NOTES:I. , I INDICATES EQUI PMENT MARKING.2. RESISTANCE VALUES ARE IN OHMS..3. C-2298/VRC's FOR CREWMEM8ERS ARE~LSO CONNECTED TO J505, JS06. AND J507.

4. COMMUNICATION WITH FIELD TELEPHONE ISCONDUCTED FROM AUDIO ACCES'SORIES ONIALLI POSITION OF INOHITORI SWITCHES BYt<EYING ON INTERCOM TO TALK, AND RELEASING TO HEAR TELEPHONE USER.

5. INTERCOM RELAYS 1<501, 1<502, AND K503 ARE~HOWN UNOPERATED. ALL THREE RELAYS AREOPERATED BY INTERCOM KEYING FROM CONTROLBOX CONNECTED TO J504 OF AM-17801VRC(CREW COMMANDER).. RELAYS KSOI AND K502 ARECONTROLLED BY CONTROL BOXESCONNECTED TO J505. J506. AND.;IS07 OF AM-1780/VRC (CREWMEMBERS). AND C~2296/VRC

CONNECTED TO C-2297/VRC.6 .. ITEL/REMOTEI TERMINALS ON

PREVIOUS VERSIONS WERELABELLED fidE[l.

I .

RII910

CS22220UF

R6ISI\

II

25.5 VDC J I*1 ----------'-.J

2 ~ 3 4 I

~

R52224K

RI390(I WATT)

l'!fU- t

4 3 C 5 L H 10 K , 2 8 1 6 F 0 9 A e P521(J512)

INPUT

R3820

(NOTE 15)

LATEST VERSION) (NOTE 6) (ASS'r AZl

----- ~P/OINTERPHONE AMPLIFIER (NOTE 6)

.-----J\~ -

RS2SISO

C~

100(ZOVOC)

CRIIN3026e P2('8V,IW) 12K

L

A520 (A4i'V .3)

~:XEDGAIN.! I~ --II

(J22 )~501

---

--I~ADIOTR~~N5S502 RfAR

I~--

2 .6(~ 7

3-~ 6

i rSTENING 5~SILENCE ~

'---- -- ._~

.~..,....,.....-

- (I:>:L ). 7

~@r550lBREAR

I

--------------~--/

------------_._-_.__.~---- -

N U E M LHBVKFJ DCA N U E M L H B V K F J 0 C A N UEMLHBVKFJDCA

J506 J507 J504 ~Q~~2~~~Q~g(J801,1 ---I (JeOI, , I (COR I, ~ g~ ~g~ ~;;:g;::>J804, J804,

II') JeO',~..~~ ..~~~ .. ~:::OR Il) OR 0 OR

J904) 0 J9(4) \0 J804) ....J ld J l.&J l.&J N10 .., ~~ .. ~~ E1iSGl+..,en en ~ ~ - f ~« <l ~a:: a::: a:

l.&J <l « <lw ~ w W W~ <l @] §] §l« enen

I

1 2

S50lAFRONT

~----~- ----..-4-----+--+--,-----,--------------- ---,-~~I------+--+---------'

RADIO IfC• MICGND

RADIO IfC" nXED AUDIO

f BATT OR J12)J508GND

+25.5 VDCRCVR ..C·

,FIXED AUDIO

RCVR "c" VARIABLE AUDIO

RADIO "C· KEYINGRADIO "C" VARIABLE AUDIO

J512 4 J E 3 C 5 l H 10 K I 2 8 7 6 F 0 9 A 8

I _::1 Jl .,:-t. - - ,v - ';) ''L_>->--- -_-- ---,

I

'------+---=--'I~ r P/O INTERPHONE AMPL

Ir R501 - FLECT' ASS" CHASSIS 1I A IXO" (A41( W/HEATS1NK ) I

V V v I ---,-<E

I Q501 ~ Q502 I ---,-<Lt 2N297 ~LU U( 2N3740 l ~MN l

I! WHT ( {NOTE 6)1 ·····i ~

(J702) I l-r(J

J509 E?-r I _ -:: YEL I I <5 ~ADtO ·A" KEYIN~ (GHD)

RADIO "C· KEYING~RETRANS L I ",'- ,...J 1 ;H ~ADIO"AII EARPHONES

M)-+! .--- I L ,'fNRf9°JsA / ... INORM I --t-< R ~N>-+ I '----( (NOTE 81.- ,. I 8 _ ~8F ~2a 5 VOC COMMONJ)-I- ~Ol 6 IL RE~ _,.. POWER *' riNT1ONINL;Ty n ": J

RADIO "c" KEYING S>--J-~.- ! R502:::-L- - ~ L-+-+----:;..;;-.t"'--+<K ~ADIO"Afi FIXED AUDIOH:>---!- I 5600 E502 --=- I 7 .AvAvl\.r - 05501 ~~04 ~ L"--/>-_-+--+--+--+-t--+--+-~'-</C ~Z5 5 VDC. RADIO MOUNT LINKR>-}- Nvv,:~ R503 * ~- 'L-,- 4K >-Kp 1F)-;- I 1 ~'1J~ k- _~ 750 _1~ -=- ~--+----t.-<.)u ~ADIO "A" MfC

B>-+ II :~5 ~ Ll-~~~~~B CB501 n< 5~ '~----r' A 1ND

RADIO IIC'I FIXED AvOIO OUT 6~>--'11-'-+-lJ:--:-i_":--t 101~9 II 1189 36V IPWR CKT BKRI I~~l 'o.;.5R-5E-OA-4R-+--~I-t--+--+--+--1.....--;-_r-'t"'"()~ ~ADIO "A" POWER RELAY CONTROL

Pr:- I~ -,:---,.;.-;----+--- ...----'-<; T ~ADIO "All RETRANS CONTROL~ r-+--+--+-+-+-+-+++-L~~I"Y 1 :... ....20

RADIO "ell Mle u>--f- ~_I ~I 1:_-<l-,.:.;15:;......._-+_-+-+---, ------t---+-.... I lGND A ">-+--+--+-........... A '-+-+--+-+,4""'0'"--~rr.J ~ -16 I (~10J)

0S-+ ~ v ~ : I .....~-f7~--+--+-~ .-_.- - ':: - - - - - ~E U51l

RA 010 "c" VARIABLE AUDIO v ,>---l~-+--..I---+I"\-+-+.... ~ '+---lr--~~-:'::-=,:-=-";;;1..;..8-<Jo~_:-=,:jl NOT E 14 ;:=:""~1:2==~~:1--_-+--+--+-+--' )4' ~RADIO Ifc" RETRANS CONTROL T'>--,I-+--+-+-i~ ~v - 19-~ ITEL/ I ~~""'~1.:.3__+-. 1~2 I I(LSOI -l.C502....'I""l,I-+--+--R---.I~~L ~AOIO "A" KEYING RETRANS

'. 20Q-----61 REMOTEI 1....,_<>""'-.;...;14__.. 1~8. I 130MH I'OOUFI --.!..J: .( J 2 Z ) 12 _ I E503 ~I • ....-o-:;.",,9_--t-.........t-+-+-+--t-' .-. I I ~

J503 I [Qffi I ,... .... ~ «()E504 ~ -10 ~--:r6-t-i--+-----, --=- ~ JE>-r r-+-----'-"',,;;)-<-y..,.,..... I I ~ II~ I I,S RADIO "AU KEYING

2 r. 14_·1 ~ I II --v::- I (NOTE 12) I --+.(H

MLM- -X- 81.... I I 4 F' .... 1 • 7 r I ;

r-:- [Qffi I II:i[ ~. -..--t-----'J:.l C501 : -r-'RN>+ f(\ K502 : ::K501 I K503 .. I IOOUF, ---L5eF

Jr+ V 2 I 2 I ~. Z ~ 1- _ , "s~ ( ~ L.::rl m l- ~_ _ - -= - - ..1 ~K RADIO f'lA" FIXED AUDIO

H''>--il'-l-I----+-+-........ ~~~~ 5 "-1_...+--_-+-+-.......--_....__ T501 ~ - C t25 5 VDC

R>-+-...-- r) --t-<P.F>--t- INT I U RADIO itA" MICB>-+- ACCENT .....--t---;--< A GN0

K>-+-0 +- --T-< 0C>+ I ~ 5'1p)-t- ~ T RADIO "~' RETRANS CONTROL

U" • IA)-1-r---, I I (JIZ)

0).-4-1 ~ I r ~ I J510! -- L...--.,-< A GND

I '---+---------t-~ H RCVR ItB" VARIABLE AUDIO

~~_Uil!~! ~~~,~_~'~[.~/"'_~."~_'~__!_ Jj~~~~RADIO IIC" RETRANS CONTROL

250:

"RCVRXMTR

"Btl

EL9XV064

Figure FO-I. Amplifier, Audio Frequency AM-1780/VRC, Schematic Diaqram.FP-l /(FP-2 blank)

S50lAFRONT,..------

(BATT OR J12)J508GND

+25.5 VDCRCVR "ell FIXED AUDIO

RCVR .IC" VARIA9LE AUDIO

I

(J702) IJ509

RADIO H C• KEYING-RETRANS ~?-rM>-tN)-+-J.>-J-

RADIO "c" KEYI NG s)--l..H~R>-iF>-tB}-+-

RADIO "C" FIXED AUDIO OUT ~)--l-

p>-+RADIO "c·' Mit U ,.....,I..-r--r--,

GND A >-+-+--+--t--ID)-+

RADIO "C" VARIABLE AUDIO V >-t--+-+--~.....

RADrO "cll RETRAN 5 CONTROL T >--'-+-----t--+-i-=-

I(J22) I

J503 IE>--rL)-+-

M>-fN>+J)-+-

RADIO "c· KEYING SRADIO "c" VARIABLE AUDIO H>-i'-t---+-+--+

R>-;F}-fB)-t

RADIO "cIt fiXED AUDIO Kc>+p)-f-

RADIO MC" Mleu>--1"'-+--.+--+-+--------,GND A>

D)-+-v.H

RADIO "e" RETRANS CONTROL T )--1--+0-----.1

I

i~_111fJillNUFMlHBV

J505 U; Q) ~ 0 ~ 0 e ~

~~~~: g; ~ ~g:e ~ g ~

J9g4R

) ~ Z~...J4~...J~ :~~,:z~<et ~

~ro~i ~~b~~~ ~-- <et l.LILLlLtJ LIJZZ

~~ EJzz00X:I:a..Q.LtJLtJ...J..Jl.LILIJt-t-

--RCVRXMTR"a"

.0034 PF.

_..l501

J505

.J508

- .- .. J503

120 RCVR I'C"

(OR DC PWR)

J506

J504

CMDRBOX

CREWM EMBER BOXES

J507

J510

J509 ~ - -

J

L

r J511..-

L ~ = JdJ2 5 3 4 I

1 LAYOUT OF AMPLIFIER RECEPTACLES

NOTES':I UNLESS OTHERWISE INDICATED, RESISTANCES ARE IN )HMS,

CAPACITANCES ARE IN pFc:::::::J INDICATES EQUIPMENT MARKINGREFERENCE DESIGNAThJNS IN PARENTHESES ( ) ARE NORMALDESTINA TlONS OF :ON NECTlONS

4 RELAYS K501, K502. AND 1<503 SHOWN

5 SWITCH S501 SHOWN IN ~TRAN$L 5502, IN

5503, IN IOFF LAND 5504, IN @!l].6 FOLLOWING IS ORIGINAL VERSION (VARIABLE GAIN) ASSEMBLY A250;

1STRCVR

"9"

8. IN SOME UNITS. CR501 IS TYPE INl482 OR INl420, AND Q502 IS1 YPE ~Nile 4 B OR 2N374 I

9 DESIGNAliONS IN aOXES ([@. 0. ETC I REPRESENT POSIT ION OF

CONTROL aOXES IMONI-rOR I SWITCHES

10. WITH TYPE 2 .. 1184 AHD FIXfD GAIN A250, OSCILLATIONS MAYOCCUR AT HIGH AWalENT TEWPERATURES.

II. C3 IS NOT PROVIDED IN 50WE UNITS.

(2. FILTER ASSEW8LY.

13.* CR502 AND R504 SUPPRESSOR ASSEWSLY.

14·ITEL/REMOTEITERMINALS ARE LABELLED

'LINEr ON PREVIOUS VERSIONS.I

15. IN LATER VERSIONS 01 IS TYPE 2N2740 AND C4

R~DIO SYSTEMS ----ol_-- _'( NOTE I)

B

II

I

P/OJl.RADIORECEPTACLE

Ao

EI4

c

MT-1198/VRC (RCVR C)

(SAME CIRCUIT ASRECEIVER B)

(SAME CIRCUIT AS RECEIVER BNT·1898/VRCl

R-442(tf)lVRC (RCVR B )I -------,I IPOWERI I, SWITCH

I[2f!) CAIOI I,...... ..

~H-"ESETI

L__1----1-e_J

R-442(M)/VRC (RCVR C)1-----

MT-1898/VRC (RCVA 8)

I

L

~---,J22 IRAOIO/AUDIOICONTROL IRECEPTACLE

~lJH POWER - -- - FII

A£CEPTACLE Ell 'OOAIIP..( ......---_--ao......-«~:).----.....-..o--+- .......---....

AoBC

C)(-4121/VRC

oCA

IIII

--:--..f-- --------~.,-< •t I I

- -t- - -t - - - - - - - - -t -< AI I t--.-------- -~-< C

I I

------- .l-( 0

Ao

MT-1029/VRC (RADIO 8)

I

--l--L __J

C

"AMP

CI~-'M-p----.-----II,tIII

),;'

",,,____ ..,;,1

B

K40.

:C.oNC

IIII

PIOP40'

eR411

__1-1-{u}-1_

RCVR- XMTR (RADIO 8)

RCVR- XMTA (RADIO A)

( SAME CIRCUIT AS RADIO A )

PIO ,...------1I POWER I I ~SWITCH .#~

" , I OFF' I,,~------------------

L

L

II

I

~--------- -- - --'I "

,,, , " ;;c;- - --- --~i " , 1(23-- 'I " " "MAIN POWER - - - - - -- J2. - - -- POWER -- -- - -RECEPTACLE RADIO TRANSFERJ21 0 RECEPTACLE RECEPTACLE

" ~I~~'

" I:;::~C21

" F21' v;,';J E24

~£23

)l'PIVOTlINK

" I I E22 (NOTE 2)~

"L _

A

o

C

B

III,III

: L - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -1- - - - - - -,L , ,

IIIII

•II,II

•tI:L ~-,

~-------------------------------------------------------------,IIIIIII,III

•IIIII

NOTES:RADIO SYSTEM CAN CONSIST OF(AlONE RCVA-XMTR;(e) TWO RCVR-XMTRS.(C) ONE RCVR-XMTR WITH R-442U~)/VRC~ OR( 0) ONE RCVR-XMTR WITH TWO R-442(.l/VRC·SANY RADIO CONFIGURATION CAN 8E USED WITH QR WITHOUTR·AOI0-1NTERCOM SYSTEM (SEE NOTE Z l

WITH LINK IN POSITION SHOWN, POWER FOR 80TH RADIOeS)AND RADIO-INTERCOM SYSTEM IS CONTROLLED Byt "'AIN PWR I SWITCH IN AM -lrao/vRC WHEN RADIO-INTERCOMSYSTEM IS NOT USED WITH THE RADIO SYSTEM. THE LINK MUSTBE POSITIONED AS SHOWN IN OASWED LINES

3. ASSEMBLY ASO,SHOWN IN C-229S/VRC, C-2297/VRC, ANDC-22'S/VRe,IS IDENTICAL CIRCUIT DETAilS ARE SHOWNONLY IN C-2298/VRC

4 ex -4123/VRC IS USED INSTEAD OF VEHICLE WIRING ANDeX-1010/VRC'S IN SOME VEHICLE INSTALLATIONS

S. C-229S/VRC'S FOR CREWMEMBERS ARE ALSO CONNECTEDTO JSOS, JSOI. AND J501.

• ~~"1:e:'N PARENTHESES ARE USED IN HIGH GAIN VERSION

1, g:~:;I~A~~~~R:~~EI~N~;CATED, RESISTANCES ARE IN OHMS,

•. c::::::::J INDICATES EQUIPMENT MARKING.

J 8 C 0 A 8 A C D

C)(-4720/VRC

I+I ---A--r< B

(-) --tJ--l-< A

C

D

~------------ --" " , " "'PiO - --- ---" " " ,,--- --- ........------------------------- -

__ J23MAIN POWER -- -- -- - - J24 ~- POWER TRANSFERRECEPTACLE RADIO RECEPTACLE FJ21

E21 ~'" E24.~ RECEPTACLE F

( I t C210( .,

I F21,.,

~100AMP ~~';I\lOT

~ LIHK(NOTE 2)-

" I I J. F:22~

"L _ MT-I029/VRC (RADIO A)--------~..........

TM 11-5830-340-30

CX-7621/V'"

~~I :6ee ExTERNALI LAMP

A

L-_

0251-8

4

PiaT861

56

~

R2556.800

0251-C'>0252-;13

C-2296/VRC

0252-£(02-C)

R257It<(RB

>--1",--_.4,700 )

L

I•

I

PiaC)(-7056/VRC

P/O

~2,,I,

A~4III

~I

VEHICLEWIRING

AM-1780/VRC

-- - -- - -- - -- - -- - :AP~O:- - -- - -- -lAMPLlF1ER

A250 (NOTE 6 )

1-- - -- - --- -~=-----=Ol~:ll>-r----:L (RI ("2: (flt3

':'" 390) 127) I 120) I

r---------Jhy--~-J~~,--.-J,~,--~ II I .L.t ~ (RS ...-

~ 18K) r- -------'(02-1)

R251 L_ - - -- ... -- ........."'--,

2.200 i.;60) -.b-

II ~~7g~5/VRCC)(-7057/VRC

0502-8

PIO

~E- I

II

l --lr-'" ---1 ·I I ~~~ IRAO TRANS 1 101- 207/VRC I~ ~ PUSH-lO-TALK

B ~--'"I"' 8 r- .., SWITCH I

I < C~--~ C }oooooo'o-----t-.....t-""O II I I I 3 AaO I, 0 ~--~ 0 >-+,---' I ,(NOTE]) I~ A~--+B A )1-"'1o.o......41...----+-1""00 I ,

~ I !L_~ \ L~__L---_--~ ~

R504150

EL9XV065

Figure FO-2. Power Distribution Circuits ofAM-1780/VRC with Radio System. and Radio-intercom SJ'stem.,

O~l-B

a0~2-E

A REAR

O~I-E

A REARo

o~ B REAR

I01

II

~TO 24 VOC WHENAM-1780/VRC ISNOT USEO WITHRAOIOS

PIOJ508

C-2297/VRC (DRIVER)

R901I~O

05901

~C502

C.A50lIN33268

r-----I0---.......-41--_

I A80 t II (NOTE 3) II 0-3 ....1 ___L J

L

POWERINORM' CICT

, R504 BKR

IINT ONLY I0 i'oO----'l..Wli~."".. __................ @IT]I @E]

0 1

: IMAINIPWRI, S504_----0..

PIaS~OIB

FRONT

o

o

I INSTALLATION IIRETRANS] 0

~oe--....g..-_

liNT ONLY IPIOJ501

RAOIO- INTERCOM SYSTEM{NOTE I»

~--

PIaJ~04

C ) ,IAN

I

I

A~L ~ _

B

C

o

PIOCX-4723/VRC

PIOJ22

RAOIOI AUOtO/CONTROLRECEPTACLE

- -- -----

,..--+.....-t' C)(-4721/VRC

(SAME CIRCUIT AS RECEIVER BMT-189S/VRC)

MT-1198/VRC (RCVR C)

R-44Z(tf}/VRC (RC"R 8 )I ----II (POWERI It SWITCH

I @TIl CR 101 I,........ ..~N-AESETI •

L__l----1-£:-J

R-442(*)/VRC (RCVR C)1-----1I •

I(SAME CIRCUIT AS I

RECEIVER 8)

MT-1898/"RC (RCVR B)

II

II

L

C 0 A B A C

~--- --- -----

--- - - PIOJI4

JII RAOIOMAIN POWER FII RECEPTACLERECEPTACLE Ell tOOA..P EI4

( 0 (~

Ao

.....--------------------------

L

-;;-----,J22 IRAOIO/AUOIOICONTROL IAEC EPTACLE I

I

____J

........------- ..,...-« B

........-------------------------------""I--o( C

......-------------------------------.......-« 0I

~A

~-----------------_:~

< I

< A

< c< 0

FP-3/(FP-4 blank)

TM 11-5830-340·-3.0

YSTEMS------En , RADIO - INTERCOM SYSTEM ------------------------------------------"

C-2297/VRC(DRIVER)

- -:-1C-2296/VRC(OUTSIDE VEHICLE)

H·207/VRC I-~[!!9J :t.5901 - i <K +-(....,----------r-I..,) K >-r-------iKJ

~IH(: : )Hf.I~~2NSIIEXTI rAuoiO ACCESSoR';Esl LJ-----......., 1

Q+---t-__.........(Y......EL.....)-"9-0-e3 0 (a I I '---__-=_~

t- 1I p, irJ_

.....__J_90..2rr111( 0 (: - - a- --- - - ~

I

I PUSH.TQ-TALK I

O--..,..-------4.....---~ C (: ~ I~I _~

o

omJ

[&]0

rTNT1I.2!!br.J

AM-I780/VACSr.UTTER (RADIO A)

J

1

C-2299/VRC(NOTE It NOTES.

L:EL9XV066

I. RADIO SYSTEMS CAN CONSIST OF:

~k °T~OR~~~R~~~~~~N('A"~~~g_~~~~~~~~-45>'ANY RADIO CONFIGURATION CAN BE USED WITH ORWITHOUT RADIO/INTERCOM SYSTEM. FOR AN/VRC·49AND AN/VRC-45. C-2299/VRC IS PROVIDED.

2. KEYING AND MIKE CIRCUITS CAN BE ANOTHERRECEIVER-TRANSMITTER (RADIO RELAY SETUPWITH MK-4561GRC) OR RADiO/WIRE INTEGRATION(R/W) EQUIPMENT (SUCH AS AN/GSA·7).

3. C·2298/VRC·S FOR CREWMEMBERS ARE ALSOCONNECTED TO J505. J506, AND J507.

4. RELAYS K50l, K502, (SHOWN DfENERGlZED)ARE ENERGIZED WHEN ANY CREWMEMBER KEYSON INTERCOM.

5. POSITION ill CONTROLS RADIO A; POSITION 00CONTROLS RADIO B.

6 ALL CIRCUITS ARE GROUNDED AT PiN A OFEACH CONNECTOR (NOT SHOWN).

7. RESISTANCES ARE IN OHMS.

8.~r::=l INDICATES EQUIPMENT MARKING.fer:

o

o[i]

[C]o

I

I

III

~ 0

-' -.

-4

I & I

I 8 : :~ (HOTEl( )

I

l~== INTERPHON:J. Af OUTPUT 10...... .: AWL INTERCOMEARPHONES

CX-4723/VRC

~MITTERWD~

---, _u.1 fMT-t~P40I :r )",24 J2~<T ..._ ...._ ...... T~J503

A- " ",------..........N). I(U u'I I ,., ,

I I II I ,

t)~ .J<S s~ I

~l:~- s~E 8 C D

1 -t lI Jr I

J~H-T0;;JTAL:K

AUDIO At:,C!1SOR1E1-

Figure FO-8. Radio Transmission and Keying Circuit~ ofAM-1780/VRC with Radio System and Radio-intercom System.

FP-S/(FP-6 blank)

; _/' RADIO 5'1'5TEIII5--------~ lNOTEl1 '

CX·4723/VRC(RADIO A) I F~P"OI) ),J24 J22( ( ~ )

,. 'IT, ITI I I

~ I~ ~I 1I I N ) I 1(U (I II I ~

II I

I IRETRAN5 H) I 1 <5 (I l J I ~

I I ,RELAY I

I : I L_...J~E --I: -IA~~1:1-- -~

E 8 C 0 E 8 C 0

r-~~r-tl ~-~ttlI CXlNT~! I I r I

...~ ~ ..PUSH-TO-TALK PUlH-TOoTAL.KIAUDIO ~ESSOftIE8l~O~~ AUDIO AC~5~

I

~

ClC-41231VRC

RECEI;ER-TRANSMITTER~D~

~ ---, uJ rmO~r::~=:"'1 J-_T I MOl :r tr ,J2~ (T '

TRANSMIT I I ~ I I I I I....+--<I-+-..:...----..:----+1~~ N ) I I (U '

.. ,MANCH I I I:: I Il'mf ~ - - - - - ~ I I II- T " I I I 1 I

I ")1 1(5 '

~ IL_.J

I :- -- -,. - -1R£r::rI"t" ~ 1 SkRl~E -J..- '-;;"-A,- - ~

~kifl ct-ktflI ~~: rr II ~ r! r II PUSH-TOOTAL.KJ I PUSH-TO-TAL;K I~CE.!,SOR~E!) ~AC~SSORI!5

Documents

TM_11-5830-340-30