Sharp VCR Manual VCA582U

7/22/2019 Sharp VCR Manual VCA582U

1/841

VC-A582VC-A582VC-H982

In the interests of user-safety (Required by safety regula-tions in some countries) the set should be restored to itsoriginal condition and only parts identical to those specifiedbe used.

SY7J5VCA582U/

MODELS

SERVICE MANUAL

This document has been published to be used for

after sales service only.The contents are subject to change without notice.SHARP CORPORATION

CONTENTSPage

1. GENERAL INFORMATION .............................. 41-1 FEATURES .................................................4

1-2 SPECIFICATIONS ..................................... 4

1-3 LOCATION OF MAJOR COMPONENTSAND CONTROL ......................................... 5

2. DISASSEMBLY AND REASSEMBLY .............. 6

2-1 DISASSEMBLY OF MAJOR BLOCKS ....... 62-2 DISASSEMBLING THE MECHANISM/

MAIN PWB ASSEMBLY ............................. 72-3 CARES WHEN REASSEMBLING.............. 8

3. FUNCTION OF MAJOR MECHANICAL

PARTS ..............................................................94. ADJUSTMENT, REPLACEMENT AND

ASSEMBLY OF MECHANICAL UNITS .......... 114-1 MECHANISM CONFIRMATION

ADJUSTMENT JIG .................................. 115. ELECTRICAL ADJUSTMENT ........................ 305-1 ADJUSTMENT OF HEAD SWITCHING

POINT .......................................................31

Page5-2 ADJUSTMENT OF FV (False Vertical Sync)

OF STILL PICTURE................................. 315-3 CHECKING OF OFF TRACK ................ 31

5-4 ADJUSTMENT OF SIF-INPUT LEVEL .... 325-5 ADJUSTMENT OF FILTER...................... 32

5-6 ADJUSTMENT OF STEREO VCO........... 325-7 ADJUSTMENT OF STEREO

SEPARATION ...........................................326. MECHANISM OPERATION FLOWCHART

AND TROUBLESHOOTING GUIDE .............. 33

7. TROUBLESHOOTING ................................... 398. BLOCK DIAGRAM ..........................................51

9. SCHEMATIC DIAGRAM AND PWB FOILPATTERN .......................................................61

10.REPLACEMENT PARTS LIST ....................... 77

11.EXPLODED VIEW OF MECHANICALPARTS ............................................................ 90

12.PACKING OF THE SET ................................. 95

VIDEO CASSETTE RECORDER

VC-A582UVC-A582U(A)VC-H982U

VC-A582U/A582U(A)

VC-H982U


2/842

C-A582UC-A582U(A)C-H982U

IMPORTANT SERVICE NOTES

WARNING :TO REDUCE THE RISK OF FIRE OR ELEC-TRIC SHOCK, DO NOT EXPOSE THIS AP-PLIANCE TO RAIN OR MOISTURE.

RISK OF ELECTRIC SHOCKDO NOT OPEN

CAUTION

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DONOT REMOVE COVER. NO USER-SERVICEABLEPARTS INSIDE. REFER SERVICING TO QUALIFIEDSERVICE PERSONNEL.

This symbol warns the user of uninsulated voltage

within the unit that can cause dangerous electric shocks.

This symbol alerts the user that there are importantoperating and maintenance instructions in the literature

accompanying this unit.

This symbol mark means fast operating fuse.

For continued protection against risk of fire, replaceonly with same type fuse F901 (1.6A, 125V).

CAUTION:

BEFORE RETURNING THE VIDEO CASSETTERECORDER

Before returning the video cassette recorder to the user,perform the following safety checks.

1. Inspect all lead dress to make certain that leads are

not pinched or that hardware is not lodged betweenthe chassis and other metal parts in the video cassetterecorder.

2. Inspect all protective devices such as non-metalliccontrol knobs, insulation materials, cabinet backs,adjustment and compartment covers or shields, isola-tion resistor/capacitor networks, mechanical insula-tors etc.

3. To be sure that no shock hazard exists, check forcurrent in the following manner.

Plug the AC line cord directly into a 120 volt AC outlet(Do not use an isolation transformer for this test).

Using two clip leads, connect a 1.5k ohm, 10 wattresistor paralleled by a 0.15F capacitor in series withall exposed metal cabinet parts and a known earth

ground, such as a water pipe or conduit. Use an SSVM or VOM with 1000 ohm per volt, or

higher, sensitivity or measure the AC voltage dropacross the resistor (See Diagram).

Move the resistor connection to earth exposed metalpart having a return path to the chassis (antenna,metal cabinet, screw heads, knobs and control shafts,

SSVMAC SCALE

1.5k ohms.10W

CONNECT TOKNOWN EARTHGROUND

TO EXPOSEDMETAL PARTS

0.15 FTEST PROBE

etc.) and measure the AC voltage drop across theresistor. Reverse the AC plug on the set and repeatAC voltage measurements for each exposed part.Any reading of 0.45V rms (this corresponds to 0.3mArms AC.) or more is excessive and indicates a poten-tial shock hazard which must be corrected beforereturning the video cassette recorder to the owner.

1.6A 125V


3/843


PRECAUTIONS IN PART REPLACEMENT

When servicing the unit with power on, be careful to the section marked white all over.

This is the primary power circuit which is live.

When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn

over the PWB with due care to the primary power circuit.

Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame.

(1) Start and end sensors: Q701 and Q702Insert the sensors projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight

enough.

(2) Photocoupler: IC901Refer to the symbol on the PWB and the anode marking of the part.

(3) Cam switches A and B: D708 and D709.Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow any looseness.

(4) Take-up and supply sensors: D707 and D706.

Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do not allow anylosseness.


4/844


1. GENERAL INFORMATION1-1 FEATURES

10.Daylight Saving Time11.3-Language OSD

12.19 m System (EP Mode)13.Universal R/C14.S picture

15.Instant Replay16.EZ Set Up (Automatically Channel set up)

17.High speed FF/REW (*360)

1. 8 Hours of Recording/Playback(T-160)

2. 181 ch Cable Ready With Frequency Synthesizer Tuner3. CM Skip Search4. Automatic Playback Function

5. Blue Screen & On Screen Set-up Programming Function

6. Full Loading System7. Simple Recording Timer8. Tamper Proof Function

9. Automatic Tracking System

1-2 SPECIFICATIONS

1) Recording systemFormat: VHS NTSC standard

Luminance signal: FM recordingChroma signal: Low frequency converted direct recording

Color system: NTSCNumber of video head: 4

Tape speed: SP (33.35mm/sec.)LP (16.67mm/sec.) (playback only)EP (11.12mm/sec.)

2) Video signalInput level: 0.5 ~ 2.0Vp-p, 75 ohm Unbalanced

Output level: 1.0Vp-p, 75 ohm UnbalancedHorizontal resolution: 220 lines (SP mode)Signal to noise ratio: 45dB (SP mode)

3) Audio signalInput level: 8dBs (309mVrms, 47k ohm)

Output level: 8dBs (309mVrms, 1k ohm)Frequency response: 80Hz ~ 10kHz (SP mode linear), 20Hz ~ 20kHz (Hi-Fi mode)Signal to noise ratio: 43dB (SP mode linear)

Hi-Fi Dynamic range: 90dB (VC-H982U)

Wow and flutter: 0.005% max. (Hi-Fi mode) with T-120 tape4) Receiving channel

VHF: Channels 2 ~ 13UHF: Channels 14 ~ 69

CATV: Channels A-8, A-5 ~ W + 84Antenna input Impedance: VHF/UHF; 75 ohm

5) Misc.Fast forward/Rewind time: Approximate 1 minute with T-120 cassette

Power source: 120V, 60HzPower consumption: 20W

Allowable ambient temperature: with T-120 tape 5C to 40C (41F to 104F)Operating humidity: below 80% RH

Dimensions: 360 (W), 261(D), 92(H) mm (14-11/64, 10-9/32, 3-5/8 inch)Weight: 2.7kg (5.8 lbs)

Accessories included: 75 ohm coaxial cable, Operation manual, Registration cardinfrared remote control, Battery (2 pcs.)

Note: Specifications may be changed for improvement without notice.


5/845


1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL

RemoteCo

ntrol

MajorComponents

ofYourVCR


6/846


SHARP

4

3

1

1110

8

9

6

5

2

7

MAIN FRAMEFRONT PANEL

MECHANISM/MAIN PWBASSEMBLY

2. DISASSEMBLY AND REASSEMBLY

2-1 DISASSEMBLY OF MAJOR BLOCKS

TOP CABINET

SHUTTLE SWITCH KNOB

TOP CABINET : Remove 3 screws1.FRONT PANEL : Remove shuttle switch knob2.

Remove 1 screw3and 7 clips4.OPERATION : Remove 1 screw 5. Take it out(SHUTTLE JOG) of connector6.PWB

DRUM SHIELD : Remove 1 screwqwith drum shield.MECHANISM/ : Remove 2 screws7, 1 screw8, 1MAIN PWB screw 9. Remove 1 screw 0with

antenna terminal cover.

ANTENNATERMINALCOVER

DRUMSHIELD

OPERATIONPWB


7/847


MECHANISM CHASSIS

MAIN PWB

2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY

4

CASSETTEHOUSING

1

3

2

1. When removing the mechanism from the main PWB,

remove the antenna cover 1 screw1, and remove theantenna cover.Remove the PWB bottom plate 1 screw2.Remove the FFC cable (AA, AD, AH)3which connectsthe PWB and the mechanism.

Take out vertically the mechanism so that it does not

damage the adjacent parts.

2. Removing the mechanism and cassette controllerRemove 2 screws4fixing the cassette controller to themechanism, and remove the cassette controller.


8/848


END SENSOR

START SENSOR

AC CONNECTOR

2-3 CARES WHEN REASSEMBLING

INSTALLING THE CASSETTE CONTROLLERWhen the cassette controller is installed on the mecha-nism, the initial setting is essential condition.There are two initial setting methods, namely electrical andmechanical.1. Electrical initial settingSo as to perform initial setting of mechanism execute the

Step 1 of Installation of cassette housing. After ascertainingthe return to the initial setting position (*1) install the

cassette controller. (Conditions: When mechanism andPWB have been installed)

2. Mechanical initial settingFeed the pulley feed gear of loading motor with screwdriver. After ascertaining the return to the initial set position(*1) install the cassette controller in the specified position.

(This method is applied only for the mechanism.)

INSTALLING THE MECHANISM ON PWBLower vertically the mechanism, paying attention to themechanism edge, and install the mechanism with due careso that the parts are not damaged. So as to fix the mecha-nism to the main PWB install two housings. (Fit the antennacover to one of them. For other, fix the vicinity of loadingmotor and solder joint side of main PWB.) Connect againthe FFC cable (AA-MH, AD-ME, AH-MH) between themechanism and the main PWB.

PARTS WHICH NEED PARTICULAR CAREWhen installing the mechanism chassis on the PWB unit,take care so as to prevent deformation due to contact ofmechanism chassis with REC TIP SW.

Pulley feed gear

Screwdriver

Tilt mark (*1)

AE CONNECTOR

AL CONNECTOR

REC TIP SW

Casecondrive gear

Drive angle ofcassette control


9/849


3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

1715 1027

11

5

9

14

12

8

161346

2

7

3

1

18

No. Function No. Function

1 Full erase head

2 Sup pole base

3 Tension arm

4 Idler assy

5 Pinch drive lever assy

6 Supply reel disk

7 Sup main brake

8 Tu main brake

9 Pinch drive cam

10 A/C Head assy

11 Reverse guide

12 Casecon drive gear

13 Take-up reel disk

14 Pinch roller lever assy


10/8410


FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)

No. Function No. Function

15 Upper and lower drum assy

16 Loading motor

17 Drum motor

18 Tu pole base assy

19 Slow brake

20 Master cam

21 Capstan D.D. motor

22 Reel belt

23 Clutch lever

24 Limiter pulley ass'y

25 Casecon drive gear

26 Shifter

27 Fixing guide

26

24

21

22

19

20

25

23


11/8411


4. MECHANISM ADJUSTMENT, REPLACEMENT, ASSEMBLING AND CLEAN-ING METHODS

The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment

and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement andadjustment service must be performed by the person who have finished the technical courses.

4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG

So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initialperformance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape isnot damaged. If adjustment needs any jig, be sure to sue the required jig.

JiGTG1200 CN

JiGMP0001 BY

1. Torque Cassette Meter JiGVHT-063 CZ

No. Jig ltem Part No. Code Configuration Remarks

JiGTG0090 CM

3. Torque Gauge Head JiGTH0006 AW

5.JiGRH0002 BR

JiGSG2000 BS

JiGSG0300 BF6.

7. JiGADP003 BK

8.

9. JiGDRiVER11055 AR

2. Torque Gauge

Tension Gauge

These Jigs are used for checking

and adjusting the reel disk height.

When fixing any part to the threaded

hole using resin with screw, use thejig. (Specified torque 5 kg)

This cassette torque meter is used for check-ing and adjusting the torque of take-up formeasuring tape back tension.

These Jigs are used for checking

and adjusting the torque of take-upand supply reel disks.

Master Plane Jig andReel Disk Height

Adjusting Jig

Pinch pressing forcemeasuring jig

Reverse guide heightadjusting box driver

This Jig is used for height adjustment of thereverse guide (for reverse guide height ad-justment).

13. JiGRVGH-F18 BU

This screwdriver is used for adjusting theguide roller height.

For X value adjustment

VROATSV CD

These tapes are especially used forelectrical fine adjustment.

VROEFZCS BG 1k 19m

This Jig is used for heightadjustment of the reverse guide.

Hex Wrench (1.5 mm) JiGHW0015 AE

Guide roller heightadjustment drive

12. JiGDRiVER-6 BM

10. Alignment Tape

X value adjustmentgear type screw driver

Reverse Guide Height

Adjusting Jig

These Jigs are used for loosening ortightening special hexagon type

screws.

This Jig is used with the tensiongauge. Rotary transformer clearance

adjusting jig.

There are two gauges used for thetension measurements, 300 g and2.0kg.

Hex Wrench (1.2 mm) JiGHW0012 AE

4. Torque Driver JiGTD1200 CB

Black Level(only SYNC) signal

11. JiGDRiVERH-4 AP

Video Audio HiFi Audio Track

525 Monoscope 7k 58m

NTSC Color Bar 1k 58m


12/8412


MAINTENANCE CHECK ITEMS AND EXECUTION TIME

Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.

Parts

Maintained 500hrs.

1000hrs.

1500hrs.

2000hrs.

Guide roller assy

Sup Guide Shaft

Retaining guide

Slant pole

Full-erase head Colour and beating

Clean tape contact part withthe specified cleaning liquid.

Abnormal rotation or significant vi-bration requires replacement.

RemarksPossible symptom

encountered

3000hrs.

Lateral noises Headoccasionally blocked

Small sound or sound

distortion

Upper and lower drum assyPoor S/N ratio, no colourPoor flatness of the enve-

lope with alignment tape

No tape running, uneven

colour

Clean rubber and rubber

contact area with thespecified cleaning liquid.

Pinch rollerNo tape running, tapeslack

No tape running, tapeslack, no fast forward/rewind motion

Capstan D.D. Motor

Reel belt

Cassette not loaded or

unloaded

Idler assy

Tension band assy Screen swaying

Loading Motor

Limiter pulley

Supply/take-up Main brake levers Tape slack

A/C head

No tape running, tapeslack

NOTE: : Part replacement. : Cleaning : Oil refilling

Cleaning liquid Industrial ethyl alcohol

* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is found, cleanor replace parts.

Clean tape contact area withthe specified cleaning liquid.


13/8413


Figure 4-1.

Reassembly1. Before installing the cassette housing control, short-

circuit TP801 provided at the center (when facing to themain PWB), press the eject button. The casecon drive

gear turns and stops when the positioning mark ap-pears. Engage two teeth of casecon drive gear with thethree teeth of casecon drive angle gear, and set on the

mechanism chassis as shown below.

Figure 4-2.

2. Install in the reverse order of removal.

Notes:1. When fitting the S/E sensor holder to the cassette

controller frame L/R, take care.

2. Misengagement of teeth of casecon drive gear and driveangle gear causes malfunction. (The cassette cannot beset, load and ejection are repeated).

3. In the case when you use the magnet screw driver, neverapproach the magnet driver to the A/C head, FE head,

and drum.

4. When installing or removing, take care so that thecassette housing control and tool do not contact theguide pin or drum.

5. After installing the cassette housing control once per-

form cassette loading operation.

TO RUN A TAPE WITHOUT THE CASSETTEHOUSING CONTROL ASSEMBLY1. Remove the full-surface panel.2. Short-circuit TP801.3. Plug in the power cord.4. Turn off the power switch.

(The pole bases move into U.L.position.)5. Open the lid of a cassette tape by hand.6. Hold the lid with two pieces of vinyl tape.7. Set the cassette tape in the mechanism chassis.8. Stabilize the cassette tape with a weight (500g) to

prevent floating.9. Turn on the power switch.10. Perform running test.

REMOVING AND INSTALLING THE CASSETTEHOUSING Removal1. In the cassette removing mode remove the cassette.2. Unplug the power cord.

3. Remove in the following numerical order.a) Remove two screws1.b) Slide and pull up the cassette housing control.

1

Casecondrive gear

Casecon driveangle gear

500g

Figure 4-3.

Mechanism chassisWeight to preventfloat (500g)

Note:The weight should not be more than 500g.

To take out the cassette tape.

1. Turn off the power switch.2. Take out the cassette tape.


14/8414


REEL DISK REPLACEMENT AND HEIGHTCHECK Removal1. Remove the cassette housing control assembly.2. Pull the tension band out of the tension arm ass'y.3. Remove the Sup/Tu main brake ass'y.4. Open the hook at the top of the reel disk, and remove the

reel disk.Note:

Take care so that the tension band ass'y and main brakeass'y (especially soft brake) are not deformed.

4. Assemble the Sup main brake ass'y.Notes:1. When installing the reel disk, take due care so that the

tension band ass'y is not deformed and grease does noadhere.

2. Do not damage the Sup main brake ass'y. Be careful so

that grease does not adhere to the brake surface.

Reassembly (Take-up reel disk)

1. Clean the reel disk shaft and apply grease (SC-141) toit.

2. Align the phase of the reel disk to that of the reel relay

gear and to install a new take-up reel disk onto the shaft.3. Check the reel disk height and reassemble the take-up

main brake ass'y.Note:1. Take care so that the Tu main brake ass'y is not

damaged. Take care so that grease does not adhere the

brake surface.2. After reassembly, check the video search rewind back

tension (see page 17), and check the brake torque (seepage 19).

Height checking and adjustmentNote:

1. Set the master plane with due care so that it does not

contact the drum.2. When putting the master plane, shift the reverse guide

a little in the loading direction. Care must be taken sinceexcessive shift results in damage.

Figure 4-6.

Note: Check that the reel disk is lower than part A but higher

than part B. If the height is not correct, readjust the reeldisk height by changing the poly-slider washer under the

reel disk.

Figure 4-4.

Note:When the tension band ass'y is pressed in the direction ofthe arrow for removal, the catch is hard to be deformed.

Figure 4-5.

Reassembly (Supply reel disk)1. Clean the reel disk shaft and apply grease (SC-141) to

it.2. Match the phases of reel disk and reel relay gear, and set

the new reel disk.3. After checking the reel disk height, wind the tension

band ass'y around the reel disk, and insert into the holeof tension arm ass'y.

Tension arm ass'y

Supply reel disk Take-up reel disk

Master plane

Reverseguide

Positionpin

Sup main brake ass'y

Tu main brake ass'y

Supply reel disk

Cassette lockrelease shaft

Take-up reel disk

Tension band ass'y


15/8415


Note:Whenever replacing the reel disk, perform the height check-ing and adjustment.

Notes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-

time measurement.

CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN REWIND MODE Remove the cassette housing control assembly.

After short-circuiting TP801 provided at the center

(facing to the main PWB), plug in the power cord.

Setting1. Set a torque gauge to zero on the scale. Place it on the

supply reel disk.2. Press the rewind button.3. To calculate the remaining capacity, slowly rotate the

take-up reel disk, and then shift it into the rewind mode.

Checking1. Turn the torque gauge slowly (one rotation every 2 to 3

seconds) by hand in the CCW direction.

2. Make sure that the indication of torque gauge is not lessthan 30mNm (306gfcm).

AB

Figure 4-7.

Master planeReel disk heightadjusting jig

Mechanism chassis

Reel disk

10 0.2mm Reel disk

CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN FAST FORWARD MODE Remove the cassette housing control assembly.

After short-circuiting TP801 provided at the center(facing to the main PWB), plug in the power cord.

Setting

1. Set a torque gauge to zero on the scale. Place it on thetake-up reel disk.

2. Press the FF button.3. To calculate the remaining capacity of the play back

mode, slowly rotate the supply reel disk, and then shiftit into the forward mode.

Checking1. Turn the torque gauge slowly (one rotation every 2 to 3

seconds) by hand in the CW direction.2. Make sure that the indication of torque gauge is not less

than 30mNm (306gfcm).

Figure 4-9.

Torque gauge

30mNm (306gfcm)or more

Supply reel disk

Idler ass'y

The gauge is held atits maximum value.

(Red mark)

Adjustment

1. If the rewind winding-up torque is less than the specifiedvalue, clean the capstan D.D. motor pulley, drive belt,

and limiter pulley with cleaning liquid, rewind again, andcheck the winding-up torque.

2. If the winding-up torque is still out of range, replace thedrive belt.

Figure 4-8.

Torque gauge

30mNm (306gfcm)or more

The gauge is held atits maximum value.(Red mark)

Idler ass'y

Adjustment1. If the FF winding-up torque is less than the specified

value, clean the capstan D.D. motor pulley, drive belt,and limiter pulley with cleaning liquid, and check again.

2. If the torque is less that the set value, replace the reelbelt.

CCW

CW


16/8416


Notes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-

time measurement.

CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN RECORD/PLAYBACK MODE Remove the cassette housing control assembly. After short-circuiting TP801 provided at the center


Turn off the power switch. Open the cassette torque meter lid, and fix it with

tape. Load the cassette torque meter into the unit. Put the weight (500g) on the cassette torque meter. Turn on the power switch. Press the picture record button, and set EP picture

record mode (x3).

CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN VIDEO SEARCH REWIND MODE Remove the cassette housing control assembly.


SettingPress the playback button and rewind button to set thevideo search rewinding mode.

Checking1. Place the torque gauge on the supply reel disk, and turn

it counterclockwise very slowly (one rotation every 1 to2 seconds) and check that the torque is within the setvalue 14.0 3.9mNm. (144 40gfcm)

Figure 4-11.

Torque gauge

Supply reel disk

Note:Surely put the torque gauge on the reel disk to measure. Ifthe torque gauge is raised, accurate measurement is

impossible.

Adjustment1. If the rewinding playback winding-up torque is not within

the setting, replace the limiter pulley assembly.

Note:

The winding-up torque fluctuates due to variation of rota-tion torque of supply reel disk. Read the center value offluctuation as setting.

CCW

Set value EP6.9 2.5mNm (70 25gfcm)

500g

Cassette torque meter

Figure 4-10.

Checking1. Make sure that value is within the setting 6.92.5mNm

(7025gfcm).2. The winding-up torque fluctuates due to variation of

rotation torque of limiter pulley ass'y. Read the center

value of fluctuation as setting.3. Set the EP record mode (x3) and make sure that the

winding-up torque is within setting.

AdjustmentIf the playback winding-up torque is not within the setting,replace the limiter pulley assembly.Note:When the torque cassette is set, put a weight (500g) toprevent rise.When the cassette torque meter is taken out.Turn off the power switch.


17/8417


Figure 4-13.

1. Detach the pinch roller from the capstan shaft.Do not separate excessively. Or the pinch lever andpinch double action lever may disengage.

2. Engage the tension gauge adapter with the pinch roller

shaft, and pull in the arrow direction.3. Gradually return the pinch roller, and measure the

pulling force when the pinch roller contacts the capstanshaft.

4. Make sure that the measured value is within setting 0.9to 11.8 N (900 to 1,200g).

CHECKING AND ADJUSTMENT OF TENSIONPOLE POSITION Remove the cassette housing control assembly.



Setting1. Turn off the power switch.2. Open the cassette tape (T-120), and fix with tape.

3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette tape.5. Turn on the power switch.

6. Make the adjustment with the beginning of a T-120 tape.

CHECKING THE VIDEO SEARCH REWINDBACK TENSION Remove the cassette housing control assembly.


Checking1. After pressing the play button, press the rewind button,

and set the video search rewind mode.2. Place the torque gauge on the take-up reel disk, and turn

it counterclockwise very slowly (one rotation every 2 to3 seconds) and check that the torque is within the setvalue 3.41.5mNm (3515gfcm).

Pinch rollerTension gauge900 - 1,200g

Capstan shaft

Tension gauge adapter

Figure 4-12.

Torque gauge

Take-up reel disk

Notes:

Set the torque gauge securely on the take-up reel disk.If it is not secure, the measurement will be incorrect.

CHECKING THE PINCH ROLLER PRESSURE Remove the cassette housing control assembly.



CheckingPress the play button to set the playback mode.

CCW

Figure 4-14.

500g

(T-120)

Weight to preventfloat (500g)

Checking1. Set a cassette tape, push the REC button to place the

unite in the SP record mode. Now check the tension poleposition.


18/8418


2. Visually check to see if the right edge of the tension poleis within the 1.5 0.25 from the right edge of the Supguide shaft.

Insert the slotted screwdriver in the tension pole adjuster,

and rotate clockwise.

Figure 4-17.

At left side from the center line

Figure 4-15.

Figure 4-16.

Insert the slotted screwdriver in the tension pole adjuster,and rotate counterclockwise.

At right side from the center line

Tension pole adjuster adjusting range

1.6-0.1-0.6

1.5 0.25

1.5 0.25

1.5 0.25

Sup guide shaft

Adjust so that the delta mark of tension pole adjuster iswithin 90range (left, right).

CHECKING AND ADJUSTMENT OF RECORD/

PLAYBACK BACK TENSION Remove the cassette housing control assembly.



Setting1. Turn off the power switch.2. Open the torque cassette meter and fix with tape.

3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette torque meter.5. Turn on the power switch.

Make the adjustment with the beginning of a T-120 tape.

Tension pole adjuster

90

90

Figure 4-18.

Tension pole

500g


Cassette torquemeter

Figure 4-19.

Checking1. Push the REC button to place the unit in the SP record

mode.2. At this time ascertain that the back tension is within the

setting (36.5 to 52gcm) by seeing the indication oftorque cassette meter.


19/8419


Adjustment1. If the indication of torque cassette meter is lower than

the setting, shift the tension spring engagement to the

part A.2. If the indication of torque cassette meter is higher than

the setting, shift the tension spring engagement to the

part B.

Checking the brake torque at the take-up side

Figure 4-22.

CCW: 8.8~23.5mNm (90~240gfcm)

CW: 4.9~11.8mNm (50~120gfcm)

Remove the cassette housing control assembly.


Setting1. Switch from the FF mode to the STOP mode.2. Disconnect the power cord.3. Set a torque gauge to zero on the scale. Place it on the

take-up reel disk.

Checking1. Turn the torque gauge at a rate of about one turn/2 sec

in the CCW direction/CW direction so that the reel diskand torque gauge pointer rotates at equal speed and

make sure that the value is within the setting (CCWdirection: 8.8 to 23.5mNm (90 to 240gfcm), CW direc-tion: 4.9 to 11.8 mNm (50 to 120gfcm).

2. Adjustment of the brake torque at the supply side and thetake-up side

Unless the supply side brake torque or take-up sidebrake torque is within the setting, clean the felt surfaceof reel disk (supply, take-up) brake lever, check again

the brake torque. If value cannot be set within the setting yet, replace the

main brake ass'y or main brake spring.

Figure 4-20.

CHECKING THE BRAKE TORQUE Checking the brake torque at the supply side

CCW: 3.9~9.8mNm (40~100gfcm)

CW: 8.8~23.5mNm (90~240gfcm)

Figure 4-21.

Remove the cassette housing control assembly.


Setting1. Set a torque gauge to zero on the scale. Place it on the

supply reel disk.

2. Switch from the FF mode to the STOP mode.3. Disconnect the power cord.

CheckingTurn the torque gauge at a rate of about one turn/2 secin the CW direction/CCW direction with respect to the

supply reel disk so that the reel disk and torque gaugepointer rotate at equal speed, and make sure that the

value is within the setting (CW direction: 8.8 to 23.5mNm(90 to 240gfcm); CCW direction: 3.9 to 9.8mNm (40 to100gfcm).

Tension arm

Tension spring

CW

CCW CW

Supply reel disk

Torque gauge

Torque gauge

CCW

Take-up reeldisk

A B


20/8420


Figure 4-24.

Replacement1. Solder the removed PWB to the new head assembly.

2. Adjust the height from the A/C head arm (lower surface)to the A/C head plate to 10.8mm with slide calipers. (3places of azimuth screw section, tilt screw section and A/C head front section) (See the figure below.)

3. Align the left end of gear of A/C head arm with thepunched mark of chassis, tentatively tighten the screws

1and2so as to ensure smooth motion of A/C headarm. Tentative tightening torque must be 0.15 to 0.20

Nm (1.5 to 2.0kgfcm).

REPLACEMENT OF A/C (Audio/Control) HEAD1. Remove the cassette housing control assembly.2. In unloading state unplug the power cord.

Removal1. Remove the screws123, Azimuth screw, Tilt screw.2. Unsolder the PWB fitted to the A/C headNotes:1. When replacing, never touch the head. If you touched,

clean with the cleaning liquid.2. When removing the screw 3, take care so that the

spring may spring out.

New A/C head ass'y

A/C head PWB

2

Spring 1

Solder

Never touch the head

10.8mm10.8mm

Azimuth screw

Height screw

Tilt screw

A/C head plate

Figure 4-25.Note:1. If the screws1and2are tighten tentatively too loose,

the azimuth and height of A/C head may change whenthey are finally tightened. Therefore care must be taken.

2. After completion of A/C head be sure to adjust taperunning. (Execute the running adjustment by the methoddescribed in Page 22, 23.)

Punched line mark on chassis

Left end of A/C head arm gear

1

2

3

Height screw

Figure 4-23.

3


21/8421


500g

Figure 4-26.

Figure 4-27.

Height screw

Azimuth screw

Tilt screw

Cassette tape


Mechanism chassis

Tape

0.3mm

A/C head

AdjustmentAdjust the height screwvisually so that the control head isvisible 0.3mm below the bottom of the tape.

1. Set the cassette tape in the unit.2. Press the PLAY button to put the unit in the playback

mode.3. Roughly adjust the height of the A/C head by turning the

height screw until the tape is in the position shownbelow.

A/C HEAD HEIGHT ROUGH ADJUSTMENT

Setting

HEIGHT ADJUSTMENT OF REVERSE GUIDE

1. Adjust the height from the mechanism chassis to the

reverse guide lower flange to 13.38 mm, using thereverse guide height adjustment jig, in tape loading

state. (Refer to Figure 4-28 (a) (b).)

Figure 4-29.

3. Set the tape, and check for tape crease near the reverseguide in the playback mode.

If crease is found, turn the reverse guide adjustment nutto remove crease. (As for crease check refer to Figure 4-30.)

(a) (b)Figure 4-28.

2. Rotate counterclockwise the reverse guide height ad-justment nut 1/10 turn. (For height adjustment use the

reverse guide height adjustment box driver (JiGDRiVER11055)).

13.38mm

Box driver

Height adjusting nut

500g

Capstanmotor shaft

Mechanismchassis

Reverse guide

En example ofcrease near thereverse guide

Weight toprevent float (500g)

Fixing guide

* Check for crease from the A direction.

Figure 4-30.

CCW

A

Reverse guide height

adjusting jigReverse guide heightadjusting jig

Reverse guide

Mechanismchassis


22/8422


ADJUSTMENT OF TAPE DRIVE TRAIN1. Tape run rough adjustment1 Remove the cassette housing control assembly.2 After shortcircuiting TP801 provided at the center

(facing to the main PWB), plug in the power cord.3 Check and adjust the position of the tension pole.

(See page 18.)4 Check and adjust the video search rewind back

tension. (See page 17.)

5 Connect the oscilloscope to the test point for PBCHROMA envelope output (TP201). Set the syn-chronism of the oscilloscope to EXT. The PBCHROMA signal is to be triggered by the headswitching pulse (TP202).

6 Set the alignment tape (VROATSV) to play. (Put a500g weight on the cassette tape to prevent lift ofcassette tape.)

Notes:1. Previously set the tracking control in the center position,

and adjust the envelop waveform to maximum with X

value adjustment nut. Thereby the tape run rough ad-justment is facilitated.

2. Especially the outlet side envelope waveform must have

higher flatness.

Figure 4-32.

2. Adjustment of A/C head height and azimuth1 Perform the initial setting of A/C head position by the

method stated in "Page 20 Replacement 3".2 Connect the oscilloscope to the audio output termi-

nal.

3 Using the alignment tape in which 1 kHz linear audiosignal has been recorded, adjust the height screw so

as to get max audio output.4 Using the alignment tape in which 7 kHz linear audio

signal has been recorded, adjust the azimuth screwso as to get max audio output.

500g

Figure 4-31.

7 Press the tracking button (+), () and change theenvelope waveform from max to min and from min tomax. At this time make sure that the envelope

waveform changes nearly parallel.8 Unless the envelope waveform changes nearly par-

allel, adjust the height of supply side and take-upside guide roller so that the envelope waveformchanges nearly parallel. (For envelop adjustment

procedure refer to Figure 4-35.)9 Turn the tilt screw to remove the tape crease at the

fixing guide flange.Play back the tape and check for tape crease at the

fixing guide flange.(1) If there is no tape crease

Turn the tilt screw clockwise so that tape crease

appears once at the flange, and then return the tiltscrew so that the crease disappears.

(2) If there is tape creaseTurn counterclockwise the tilt screw so that the

tape crease disappears.(Reference) If the tilt screw is turned clockwisecrease appears at the lower flange.

Guide roller

Weight of 500g

Cassette Tape

Figure 4-33.

For X value adjustmentAdjust the X value, turning the gear-type screwdriver.


23/8423


3. Tape run adjustment1 Connect the oscilloscope to PB CHROMA envelope

output test point, set oscilloscope sync to EXT,

trigger-input the PB CHROMA signal (head switch-ing pulse).

2 Rough adjustment of X valueTentatively fix A/C head arm screws1and2by themethod described in Page 20 "Replacement 3".Play back the alignment tape (VROATSV)(VC-

H982U), and shortcircuit TP802. As a result the auto-tracking is automatically cancelled, so that the Xvalue adjustment mode is set.

Move the A/C head with the X value adjustment geardriver (JiGDRiVER-6) by the method shown in Fig-

ure 4-33, and adjust the A/C head so as to get themaximum envelope waveform. (Note: When the A/C

head is adjusted, adjust so that the maximum en-velop waveform is obtained nearest the position ofinitial setting made in Page 20.)

3 Next, change the alignment tape to VROEFZCS toplayback. Press the tracking button (+), () and

change the envelope waveform from max to min and

PB CHROMAEnvelope

CH-1 CH-2

Head switching pulseFigure 4-34.

When the tape is above the helical lead. When the tape is below the helicallead.

Take-up side Supply side Take-up side

Adjustment

Supply side

Supply side guide rollerrotated in clockwisedirection (lowers guideroller) to flattenenvelope.

Take-up side guide rollerrotated in clockwisedirection (lowers guideroller) to flattenenvelope.

Supply side guide rollerrotated in counterclock-wise direction (raisesguide roller) to make thetape float above the helicallead. The supplyside guide roller is thenrotated in the clockwisedirection to flatten theenvelope.

Take-up side guide rollerrotated in counterclock-wise direction (raisesguide roller) to make thetape float above thehelical lead. The take-upside guide roller is thenrotated in the clockwisedirection to flatten theenvelope.

Figure 4-35.4. A/C head X value adjustment

1 Tentatively fix A/C head arm screws1and2by themethod described in Page 20 "Replacement 3".

2 Playback the alignment tape (VROEFZCS), andshortcircuit TP802. As a result the auto-tracking is

automatically cancelled, so that the X value adjust-ment mode is set.

3 Move the A/C head with the X value adjustment geardriver by the method shown in Figure 4-33, andadjust the A/C head so as to get the maximum

envelope waveform. (Note: At this time adjust so asto get the maximum envelope waveform nearest the

A/C head position which has been set in case of Xvalue rough adjustment as stated in Page 23, 3-2.)

4 Tighten finally the screws 1 and 2. Be sure totighten at first the screw1and then the screw2.

Final tightening torque is 0.6Nm (If the screw2istightened first, the X value may deviate.)

5 Adjust the playback switching point (Refer to theelectric adjustment method.)

6 Playback the self-picture-recorded tape, and checkthe flatness of envelope waveform and sound.

Note:When the A/C head X value adjustment is performed, be

sure to perform at first X value rough adjustment (refer toPage 23, 3-2). 1

2

Figure 4-36.

from min to max. At this time adjust the height ofsupply and take-up side guide roller with the adjust-ment driver (JiGDRiVERH-4) so that the envelope

waveform changes nearly parallel.4 If the tape is lifted or sunk from the helical lead

surface, the PB CHROMA envelope waveform ap-pears as shown in Figure 4-35.

5 Press the tracking button (+), () and make sure thatthe envelope waveform changes nearly parallel.

6 Finally check tape crease near the reverse guide. Iftape crease is found, remove it as stated in Page 21"HEIGHT ADJUSTMENT OF REVERSE GUIDE"

item 3.


24/8424


REPLACEMENT OF DRUM D.D. MOTOR1. Set the ejection mode.2. Withdraw the main power plug from the socket.

Removal (Perform in numerical order.)1. Disconnect the FFC cable1.2. Unscrew the D.D. stator assembly fixing screws2.3. Take out the D.D. stator assembly3.4. Unscrew the D.D. rotor assembly fixing screws4.

5. Take out the D.D. rotor assembly5.

Notes:1. In removing the D.D. stator assembly, part of the drum

earth spring pops out of the pre-load collar.

Be careful not to lose it.2. Install, so that the D.D. rotor ass'y and upper drum ass'y

mounting direction check holes align.

(Align the upper drum dent with the rotor hole.)3. Be careful not to damage the upper drum or the video

head.4. Protect the hole elements from shock due to contact with

D.D. stator or D.D. rotor ass'y.

5. After installation adjust the playback switching point foradjustment of servo circuit.

REPLACEMENT OF THE CAPSTAN D.D.(DIRECT DRIVE) MOTOR Remove the mechanism from the main PWB (refer to

Page 7 "1. When removing the mechanism from themain PWB").

Removal (Follow the order of indicated numbers.)

1. Remove the reel belt1.

Figure 4-37.

2. Remove the three screws2. Reassembly1. Taking care so that the capstan shaft does not contact

the mechanism chassis, set its position on the mecha-nism chassis, and then install with the three screws.

2. Install the reel belt.Notes:1. After installing the capstan D.D. motor, be sure to rotate

the capstan D.D. motor and check the movement.2. Set the tape, and check for the tape crease near the

reverse guide in the playback mode. Adjust the A/C

head and azimuth as stated in Page 22 item 2. If creaseis found, adjust as stated in Page 21 "HEIGHT ADJUST-MENT OF REVERSE GUIDE".

Figure 4-38.

Capstan D.D.motor

Capstan D.D. motorcontrol PWB

2

12

4

3

4

5

1

D.D. stator ass'y

D.D. rotor ass'y

FFC

Upper drum

Reel belt


25/8425


ASSEMBLING OF PHASE MATCHINGMECHANISM COMPONENTS Assemble the phase matching mechanism compo-

nents in the following order.1. Assemble the pinch roller assembly and pinch drive

cam.2. Mounting the shifter (on the back of the mechanism

chassis).3. Mounting the master cam (on the back of the mecha-

nism chassis).4. Assemble the connection gear, slow brake and loading

motor parts.

Pinch drive cam and pinch roller assemblingmethod.

(Place the following parts in position in numerical order.)

(1)Reverse drive lever1(2)Reverse guide spring2(3)Reverse guide lever assy3(4)Reverse guide height adjusting nut4(5)Pinch drive cam5

(6)Pinch roller assy6(7)Open lever7

REPLACING THE UPPER AND LOWER DRUMASSEMBLY

Replacement (Perform in the numerical order)

1Remove the motor as stated in Page 24 D.D. motorreplacement.

2Remove the drum earth brush2.3Remove the drum base3from the upper and lower

drum assembly1.

[Cares when replacing the drum]

1. Be careful so that the drum earth brush is not lost.2. Do not touch directly the drum surface.

3. Fit gently the screwdriver to the screws.4. Since the drum assembly is an extremely precise as-

sembly, it must be handled with utmost care.5. Make sure that the drum surface is free from dust, dirt

and foreign substances.

6. After replacing the drum be sure to perform the taperunning adjustment.

After that, perform also the electrical adjustment. Playback switching point adjustment

X-position adjustment and check Standard and x-3 slow tracking adjustment

7. After replacing the drum clean the drum.

Figure 4-40.

7

4

3

2

6

1

5

Figure 4-39.

2

1

3


26/8426


1Insert Reverse Guide Lever Assy

Figure 4-41-1.

Figure 4-41-3.Figure 4-41-2.

Phase Matching Point2

Pinch Roller DoubleAction Lever Ass'y Open lever

2Insert Pinch Roller/Pinch Double Action Lever Assy. 3Insert Open Lever.

Insert reverse guide lever ass'y

Align here.2Insert pinch drive cam

Pinch drive lever ass'y

Fit the pinch drive cam so that the notch of pinchdrive cam aligns with the dent of pinch drive leverassembly.

Fit the pinch drive cam so that the notch of

pinch drive lever assembly aligns with thehalf-round notch of chassis.

Turn the reverse guide leverassembly counterclockwiseto the stopper.


27/8427


Figure 4-43.

INSTALLING THE SHIFTER

Figure 4-42.

1. Make sure that the loading gear is at the point 1asshown below.

2. Install, paying attention to6 insertion points and3release points.

3. For the phase matching at the insertion point1, see thepoint2as shown below.

4. Finally fix the inserts1and4.

CapstanD.D. motor

Drum

Reel pulley

(Bottom side of mechanism chassis)

Sifter

Phase-Matchingpoint2

Insertpoint1

Half round notch

Shaft1

Round mark

Loading gear (T)

Insert

point3

Insertpoint2

Insertpoint4

Insertpoint6

Releasepoint3

Rotationpoint2

Phase-matchingpoint1

Shaft1

Shaft1

Shaft4


28/8428


INSTALLING THE MASTER CAM (AT REARSIDE OF MECHANISM CHASSIS)1. Make sure beforehand that the shifter is at the point as

shown below.2. Place the master cam in the position as shown below.

Note:See the figure below for the phase matching between themaster cam and the casecon drive gear.3. Finally fix with the E ring.

REPLACEMENT OF LOADING MOTOR Removal

Replacement1. Remove the loading motor, and install the replacement

loading motor as shown below.

Figure 4-46.

Figure 4-44-2.

When installing the master cam,align the casecon drive gearround mark with the half-roundnotch of master cam.

The loading motor pressing-in must be less than 14.7 N

(15 gf).Adjust the distance between motor and pulley to 10.2 mm).

E ring(XRESJ30-06000)

Master cam

Fully turnclockwise

Fully turn counterclockwise

Figure 4-44-1.

Face the wide tooth side ward

Master cam

Casecon drive gear

10.2 mm

Round mark

Half-round notch

+0.20.2

Apply grease

Apply grease

No grease

Figure 4-45.

+0.20.2


29/8429


2. Synchro Gear, Drive Gear L and Drive Gear R

ASSEMBLY OF CASSETTE HOUSING1. Drive Gear and R Drive angle assy

Figure 4-47.

MSPRT0381AJFJ

Apply grease

Apply grease

Apply grease

LANGF9592AJFW

Top surface should be free from scratches or soil.

Drive angle

Drive gear R

Frame

Figure 4-48.


30/8430


5. ELECTRICAL ADJUSTMENT

Notes: Before the adjustment:

Electrical adjustments discussed here are often required after replacement of electronic components and mechanicalparts such as video heads.Check that the mechanism and all electric components are in good working condition prior to the adjustments,otherwiseadjustments can not be completed.

Instruments required: Color TV monitor Dual-trace oscilloscope Audio signal generator AC milli-voltmeter Blank video cassette tape Alignment tape (VROATSV) Screwdriver for adjustment Color bar generator RF signal generator

Figure 5-1.

`1

`2

`3

`5

`4

`6`7

`8

`1 ... TP201-204`2 ... R163`3 ... TP161-163`4 ... TP168-169`5 ... TP164-165`6 ... TP801`7 ... R724`8 ... TP802


31/8431


SERVO CIRCUIT ADJUSTMENT

5-1 ADJUSTMENT OF HEAD SWITCHINGPOINT

Measuring Color TV monitorinstrument

Mode Playback still

Cassette Self-recorded tape (SP mode)

(See Note below 2)

Control Tracking control buttons(+) or ()

Specification No vertical jitter of picture

1. Play a cassette which was recorded by the unit in SPmode.

2. Press the PAUSE/STILL button to freeze the picture.3. Look at the monitor screen and adjust (+) or () TRACK-

ING buttons so that the vertical jitter of the picture isminimized.

4. Play and freeze the self-recorded tape in EP mode andmake sure vertical jitter of the picture is not noticeable.

Note:1 The FV goes back to the its initial state when the unit isput into the system controller reset mode due to powerfailure, etc.In this case, preset the FV once again.

2 Self-recorded tape is a cassette whose program wasrecorded by the unit being adjusted.

Measuring Color TV monitorinstrument

Mode Playback

Cassette Self-recorded tape (EP mode)(See Note below)

Control Tracking control buttons(+) or ()

Specification No Poor picture and Hi-Fi sound

1. Play a cassette which was recorded by the unit in EPmode.

2. Short circuit between TP802 on the main PWB, andpress both CH button (+) and CH button () at same time.

3. Press the tracking buttons (+) and () 20 times each tobring the tracking off center. Make sure that:

1) There is nothing unusual on the playback screen.2) There is nothing unusual in the Hi-Fi sound (for the Hi-Fi models only).

5. Cancel the short circuit.Note:Self-recorded tape is a cassette whose program was re-corded by the unit being adjusted.

5-2 ADJUSTMENT OF FV (False VerticalSync) OF STILL PICTURE

5-3 CHECKING OF OFF TRACK

Measuring Dual-trace oscilloscopeinstrument

Mode Playback

Cassette Alignment tape (VROABZGS)

Test point VIDEO OUT jack to CH2TP202 (Sig.)~TP203 (GND) to CH1

Control R724 Head switching point adjust-ment control

Specification 5.50.5H (lines)

1. Remove the front panel and play the alignment tape.2. Connect a dual-trace oscilloscope to the VIDEO OUT

jack and TP202 (Sig.) and TP203 (GND).(Trigger the oscilloscope with the head switching pulseon TP202.)

3. Playback the alignment tape, and then short circuitbetween TP802 on the main PWB, and press both CHbutton (+) and CH button () at same time.

4. Adjust R724 so that the leading edge of the headswitching pulse is 5.5H (lines) ahead of the vertical syncas shown in Figure 5-2.

5. Cancel the short circuited.

Figure 5-2.

5.50.5H (lines)CH-1HEADSWITCHINGPULSE

CH-2VIDEO OUT

CH-1: 1V/dev 50sec/devCH-2: 2V/dev 50sec/dev

V-sync.


32/8432


MTS CIRCUIT ADJUSTMENT.(HI-FI MODELS ONLY)

5-4 ADJUSTMENT OF SIF-INPUT LEVEL

Measuring AC milli-voltmeter and RF signalinstrument generator.

Mode E-E

Input signal RF CH-10 (at 1kHz 100%MOD.)

Test point AUDIO OUT jack

Control R141(S-IF ADJ.)

Specification 3 2dBs (1.2~2.0Vp-p)

1. Feed the RF signal CH-10 (at 1kHz 100%MOD.) toantenna terminal.

2. Connect the AC milli-voltmeter to AUDIO OUT jack.3. Adjust R141(S-IF ADJ.) so that the AC milli-voltmeter

reads 3 2dBs.

5-5 ADJUSTMENT OF FILTER

1. Make the short circuited to TP162 (Sig.)~TP163 (GND).2. Connect the AC milli-voltmeter to TP168(Sig.)~TP169

(GND).3. Make a note of the level of TP168 (Sig.)~TP169 (GND).4. Feed the 15.734kHz at 50mVrms signal to the

TP161(Sig.)~TP163 (GND).5. Adjust R163 (STEREO VCO ADJ.) so that the levels for

non signal inputed STEP 3. and inputed be just the

same.6. When the 15.734kHz at 50mVrms signal is fed confirm

the display "STEREO" is indicated on OSD.

5-7 ADJUSTMENT OF STEREO SEPARATION

5-6 ADJUSTMENT OF STEREO VCO

Measuring AC milli-voltmeterinstrument

Mode E-E

Input signal 15.734kHz at 50mVrms

Test point TP168 (Sig.),TP169 (GND)

Control R163 (STEREO VCO ADJ.)

Specification

1. Feed the RF signal CH-10 (300Hz and 3kHz 30%modulation) to antenna terminal.

2. Connect an Dual AC milli-voltmeter to left channel andright channel output terminales.

3. Set the audio signal to 300Hz and the modulation factorto 30% (Left channel only) and adjust R164 (SEPARA-

TION-1 ADJ.) so that the difference between left chan-nel and right channel outputs becomes maximized.

4. Set the audio signal to 3kHz and the modulation factorto 30% (right channel only) and adjust R165 (SEPARA-TION-2 ADJ.) so that the difference between left chan-nel and right channel outputs becomes maximized.

5. Repeat STEP 3. until obtain a specification.

1. Make the short circuited to TP162 (Sig.)~TP163 (GND).2. Connect the AC milli-voltmeter to TP164 (Sig.)~TP165

(GND).3. Feed the 22.9kHz at 245mVrms signal to the

TP161(Sig.)~TP163 (GND).4. Adjust R163 (FILTER ADJ.) so that the AC milli-voltmeter

reads minimized.

Measuring Dual AC milli-voltmeter and RFinstrument signal generator.

Mode E-E

Input signal RF CH-10 (300Hz and 3kHz 30%modulation)

Test point AUDIO OUT jack

Control R164 (SEPARATION-1 ADJ.)R165 (SEPARATION-2 ADJ.)

Specification maximized

Measuring AC milli-voltmeterinstrument

Mode E-E

Input signal 22.9kHz at 245mVrms

Test point TP164 (Sig.),TP165 (GND)

Control R163 (FILTER ADJ.)

Specification Minimized


33/8433


0510

15

20

25

Fmechanicaltiming

Mode

Rotationangle

Modecheck

Cammark

Modedetectionoutside

(D709SW

B)

Modedetectioninside

(D708SW

A)

CamgraphE

60

120

180

240

300

360

CA/END

CS/EJ

33.8

2

UL81

VSR

218

PU(LD)

188

PB

252

SLOW

269

CL

293

STOP

309

FF

325

Camswitch

0


Modedetectioninside

Ssensor

Ssensor

Moded

etectioninside

SensorA


SensorB

CS/EJ

ULD

PU

LD

VSR

PB

STILL

CL

STOP

FF

1 1 1 0 0 0 0 0 0

0 1 1 1 0 1 0 0 0

open

close

0 1EJ

UL

FF

PU

0 1 1

0 0 0

0 1 1or

0

1 1

10

1

0

0

0

0

0

1

1

1

1

1 1

VSR

PB

SLW

STP

CL

Loadingmotorturnsinreverse

direction

andmastercam

counterclockwise.

CASSETTEINSERTION

STOP

Cassette

inserting

Full-

loading

YES

YES

YES

NO

NO

NO

Unloading

Loading

motorstartsinnormal

direction

andmastercamcounter

clockwise.

Doesmechanismpositionsw.

comeoffwithin2.5

sec.?

Arestart/endsensorsatlowlevel

beforec

assetteinsertion?

Insertcassette.

Doub

leactionrackslides.

D

rummotorstarts.

Tapeloading.

Pinchrollercomesintocontact.

Cams

witchisatPBposition.

Lo

adingmotorstop.

Isdrum

FGpulseoutputted?

End

End

Cassette

isejectedandloading

motorstops.

Startsensorclose.

(Cassetteisjud

ged

caughthalfway.)

(CassetteLEDorsomeotherpart

isjudgeddefective.)

6.MECHANISMOPER

ATIONFLOWCHARTANDTROUBLESHOOTIN

GGUIDE

MECHANISMOPERATIONFLOWCHART

*Thisflowchartdescribestheo

utlineofthemechanismsoperation,butdoesnotgiveitsdetails.


34/8434


STOP

REC/PLAY

PLAY

STILL

PLAY

VSR

VSR

PLAY

Capstanmotorturns

counterclockwise.

Istake-upreelsensorsignal

outputted?

End

PressREC/PLAYkey.

Pictureappears.

Unloading

Setcapstanmotortosearch

speed.

End

PressFFkey.

PLAY

VSF

REC/PLAY

STOP

Capstanmotorturnsin

reversedirection.

Loadingmotorturnsin

counterclockwisedirection

andmastercamclockwise.

Slowbrakecomesinto

contactwithcapstanmotor.

Slowbrake

pressing

CamswitchisatSTILL

position.

End

Capstanmotorstops

.

PressSTOPkey.

Loadingmotorstops.

End

Stopcapstanmotor.

NO

YES

PressSTILLkey.

Pinch

roller

releasing

Idler

swinging

Pinch

roller

pressing

Loadingmotorturns

clockwisean

dmaster

camcounterclockwise.

Turncapstan

motorin

reversedirec

tion.

Turnloading

motor

counterclock

wise.

CamswitchisatVSR

position.

Setcapstanmotortosearch

speed.

Istake-upreelsensorsignal

outputted?

PressREWkey.

Release

pinchroller.

Camswitchis

atPU2position.

Camswitchis

atPU1position.

Stoploa

dingmotor.

Pressp

inchroller.

Loadingmotorturnsclockwise.

Releasethe

supplyauxiliary

brake.

Stoploa

dingmotor.

End

Unloading

C

amswitchisatPBposition.

End

PressPLAYKey.

L

oadingmotorturnscounter-

c

lockwiseandmastercam

c

lockwise.

C

apstanmotorturns

c

ounterclockwise.PBspeed.

NO

YES


35/8435


STOP

FF/REW

ST

OP

CASSETTEEJECT

FF/REW

STOP

NO

NO

FF/REW

operation

Brake

function

Turncapstanmotorin

normalorreversedirection,

aftertheremainingtapehas

beendetected.

Loadingmotorturnscounter-

clo

ckwise.

Ca

mswitcnisatStop

position.

End

PressSTOPkey.

PressFF/REWkey.

Stopcapstanmotor.

Loadingmotorstops.

End

Loadingmotorturn

sinclockwiseandmastercam

counterclockwise.

4supplyreelpulse

s

outputted?

Doesthetake-up

reelpulseoutput

twoedges?

Capstanmotorturns

clockwise.

Loadingmotorturn

s

clockwise.

Camswitchisat

Ejectposition.

Loadingmotor

stops.

Capstanmotor

stops.

PressEJECTkey.

Tape

unloading

Cassette

eject

End

Capstanmotorturns

clockwise.

Capstanmotorturns

counterclockwiseinabout

2seconds.

Stoploadingmotor.

Capstan

motorturnsinreversedirection.

Ca

mswitchisatULposition.

YES

YES


36/8436


MECHAN

ISMTROUBLESHOOTING

1.FF/REWF

AILURE(NOTAPEWINDING)

PressFFkey.

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

Ismastercamat

FFposition?

Doesloading

motoroperate?

Modeschang

ing

smoothlythro

ugh

camswitch?

Loadingmoto

r

controlsystem

introuble.

AreVco12V

and

Vcc5Vapplied?

Replacethe

capstanmoto

r.

Replacetheidler

assy.

Replacethereel

sensor.

Isvoltageapplied

toloadingmotor?

Loadingmotoris

damaged.Replace

it.

Voltagesupply

systemintrouble.

Modesensor

systemintrouble

ormastercam

malpositioned.

Volta

gesupply

systemintrouble.

Doescapstan

motorturninFF(or

REW)direction?

Areidlerwheel

assyandreeldisk

inmesh?

Isthepulse

outputtedfromreel

sensor?

Thecassettetape

ispresumably

damaged.

2.REC/PLAYFAILUR

E(MODERELEASE)

NONONONO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

Isthemastercam

atPBposition?

Doesloading

motoroperate?

Modeschanging

smoothlythrough

camswitch?

Loadingmotor

controlsystem

introuble.

AreVco12Vand

Vcc5Vapplied?

Replacethe

capstanmotor.

Replacetheidler

assy.

Replacethereel

sensor.

Isvoltageapplied

toloadingmotor?

Loadingmotor

is

damaged.Rep

lace

it. V

oltagesupply

systemintrouble.

Voltagesupply

systemintrouble.

Doescapstan

motorturn?

Areidlerwheel

ass'yandreeldisk

inmesh?

Isthepulse

outputtedfromreel

sensor?

CheckmainPWB.


37/8437


Replaceloadingmotorblock.

3.WINDINGFAILU

REATVSR

4.UNUSUALSOUNDINEACH

MODE

IsPlayback

functionnormal?

Mastercam

shiftingtoVSR

position?

Goto2.REC/

PLAYFAILURE

routine.

Replaceidler

gearassy.

Replacelimiter

pulleyassy.

Replacereel

sensor.

Goto2.REC/

PLAYFAILURE

routine.

Areidlerwheel

assyandsupply

reeldiskinmesh?

Issupplyreeldisk

windingtorque

normal?

Ispulseoutputted

fromreelsensor?

CheckmainPWB.

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

YES

YES

NO

NO

YES

PressREWk

ey.

4-i)Unusualsoundincassette

insertionandejectionmode

Isunusalsoundheardduring

cassettecoutrolrunning?

Unusualsoundheardwithpinch

rollerlevergoingupordown?

Isunusualsoundheardduring

loading/unloading?

Checkpinchrollerdrivecam,

pinchroller

driveleverandreverseguide

fortheiractions.

Replacedamagedonewithnewone.

Replacecassettecontrolassy.


38/8438


YES

YES

NO

NO

NO

NO

YES

YES

Replacecapstanmotor.

4-ii)UnusualsoundinFF/REWmode

Isreeldiskheightasspecified?

Thrustgapfoundatreeldisk?

Drivesystemoutofcontactwithany

partonmainPWB?

Turncapstanmotorbyhand.

Unusualsoundheard?

Checkdrivesystemsgearsfor

damage.Replacedamagedgear

withnewone.

Reeldisk

Limiterpulleyassy

Idlerwheelassy

Checkreeldiskandmaincha

ssis.

Andreplacedefectiveparts.

Adjustreeldiskheight.

Rearrangethepartsonm

ainPWB.


39/8439


7.TROUBLESHOOTIN

G

FLOWC

HARTNO.1POWERTROUBLESHOOTING(1)

Nopower

UnplugtheACpowercord.

Replugitafewminuteslater.

SeeFLOWC

HARTNO.2

POWER

TROUBLESHOOTING(2)

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

Isthefusegood?

Replacefuse.

AreAT5Vvoltagelinenormal?

Checkprimarycircuit.

AreAT44V,

AT12V,-24V,

AT18V

andfilamentvoltagelinesnormal?

Checkeachrectifiercircuits

and

short-circuitofsecondarycircuit.

Is"H"levelappliedatpin(1)of

IC701?

CheckQ905andP-FAIL(L)

signallineetc.

Checksystemcontrolcircuit(IC701)

andcamswitchcircuit.

FLOWC

HARTNO

.2POWERTROUBLESHOOTING(2)

IncaseofFuse(F901)blownout.

ReplaceF901,

Q901andQ902,

check

D921~D925asaresultofcheck,

if

poor,replaceatthesametime.

Checkshort-circuitorleak

ofD905

thrutoD909,

D918andse

condary

circuit.

FLOWC

HARTNO

.3POWERTROUBLESHOOTING(3)

Incase

ofabnormalnoise(sound)

CheckD905thrutoD909andD918.

YES

YES

YES

NO

NO

NO

FLOWC

HARTNO.4POWERTROUBLES

HOOTING(4)

Incaseofoutputvoltageatlowlevel.

ChecktheD91

4,

Q903andQ904.

ReplaceD914,

Q903andQ904.

Che

ckIC901.

ReplaceIC901

Checkshort-circuitorleakofT901.

ReplaceT901.

Checkprimaryc

ircuit,Q

901,Q

902,

C907thrutoC9

09andC930.

FLOWC

HARTNO.5TIMER(1)TROUBLE

SHOOTING

Theflourescentdisplaytubefailslightup.

Isthesupplyvoltageof5Vfeedto

pin(18)ofIC801?

CheckAT5Vline.

Isthesupplynegativevoltageof-24V

feedtopin(16)o

fIC801?

Chec

knegativevoltagelineand

powe

rcircuit.

Isthere500kH

zoscillationat

pins(19)and(20)ofIC801?

Che

ckFL801andIC801.

Isfilamentvolta

geappliedbetween

(1)/(2)and(31)/(32)ofthe

flourescentdisp

laytube?

Alsonegativevoltageapplied

betweenthesepinsandGND.

Checkpowercircuitandperipheral

circuitofD952.

Doestheflourescentdisplaytube

function?

ReplaceIC5001.

Checkforcracksontheflourescent

displa

ytube.

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO


40/8440


FLOWC

HARTN

O.6TIMER(2)TROUBLESHOOTING

Doesthekeyswitchmakegood

contact?

Checkswitchcontact.

Isthereashortinthescanoutsor

keyinputs?

CheckalltheterminalsofIC

5001

andswitchesforpoorsolder

ing.

Arepulsesreceivedatpins(26)thru

(29)ofIC801whenthekeysare

activated?

Checklinesofkeyinandscanout.

CheckIC801,

IC701andFLPdata,

FLPclock,

FLPCSandkeydata.

YES

YES

Y

ES

N

O

N

O

NO

Key-in

inputisnotreceived.

FLOWC

HARTNO.7IN

FRAREDR/CTROUBLESHOOTING

Nooperationispossiblefromtheinfraredremotecontrol.

Doestheinfraredremotecontrol

function?

Replaceinfraredremotecon

trolas

required.


Vddterminalofremotecontrol

receiver?

CheckAT5VandGNDlines.

Is"L"pulsesentoutVoutterminalof

receiverwhentheinfraredremote

controlisactivated?

Replacereceiver.

CheckbetweenatVoutterminalof

receiverthrutopin(5)ofIC701.

ReplaceIC701.

YES

N

O

NO

N

O

N

O

N

O

NO

FLOWC

HARTNO.8CASSETTECONTROLTRO

UBLESHOOTING(1)

Acassettetapeisnottakein.

Isthecassetteho

usingdistroted?

Fixorre

placethecassettehousing.

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

Ch

eckstartsensorcover.

Checkstartsensorandalltheway

upthruto

pin(79)ofIC701.

CheckIC701andallthewayup

thrutop

in(2)ofIC703.

CheckIC703.

CheckbetweenIC703andloading

motor.

Replaceload

ingmotor.

Isthespecifiedvoltageappliedatthe

loadingmotorterminalwhenthe

cassettetapeisinserted?

Doespin(5)ofIC703changeto

about10Vwhenthecassettetapeis

inserted?

Doespin(2)ofIC703gotoa"H"

(about1.7

V)levelw

henthecassette

tapeisinserted?

Doespin(79)ofIC

701changefrom

"H"to"L"levelwhe

nthecassette

tapeisinserted?

Arestartsensorco

vergotoopen

whenthecassette

tapeisinserted?

NO

NO

NO

FLOW

CHARTNO.9CASSETTECONTROLTROUBLESHOOTING(2)

Acassettetapeistakenin,butejectedatonce.

Doesthestartsensorpulseatpin

(79)ofIC701chang

efrom"L"to"H"

levelwhenthecass

ettetapeis

loaded?

Checkstartsensorandalltheway

upthrutoIC701.

Doestheendsenso

rpulseatpin(85)

ofIC701changefro

m"L"to"H"level

whenthecassettetapeisloaded?

Checkendsensorandalltheway

upthrutoIC701.

Doesthemastercammodeshifter

operatenormallywh

enthecassette

tapeisloaded?

Checkcamswitchandalltheway

upthrutoIC701.

ReplaceIC701.

YES

YES

YES


41/8441


FLOWC

HARTNO.10LOADIN

GMOTORANDEJECTTROUBLESHOOTING

Thecassettetapefailstoeject.

Doesthecapstanmotorstartwhen

theEJECTbuttonispressed?

SeeFLOWC

HARTNO.12.

(CAPSTANMOTORTROU

BLE

SHOOTING)

Doesthetake-upreeldiskturnwhen

thecapstanmotorisrunning?

Checkreeldiskandreeldriveunit.

Arepulsesappliedatpin(2)ofIC701

whenthetake-upreeldiskisturning?

Checktake-upreelsensora

ndallthe

wayupthrutoIC701.

Isa"H"(about1.7

V)levelappliedat

pin(4)ofIC703whenareelpules

hasbeeninputted?

Checkpin(92)ofIC701

.

Isthevoltageabout10Vsentoutof

pin(7)ofIC703?

CheckIC703.

Isthespecifiedvoltageappliedatthe

loadingmotorterminal?

CheckbetweenIC703and

allthe

wayupthrutotheloadingm

otor.

Dosetheloadingmotorrun?

Replaceloadingmoto

r.

Replacecassettecam,g

ear,etc.

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

FLOWC

HARTNO.11SYSTEMCONTROLTROUBLESHOOTING

Nopoweristurnedon.

Arekeydatapulses

appliedatpin

(15)ofIC701,

respectively?

CheckIC801andIC701,

andall

theway

thrubetweenthem.

AreFLPdatapulses,

FLPclockpulsesandFLPcontrolreadypulse

sappliedtopins(24),(23)

and(22)ofI801,re

spectively?

Doespowercontro

l(H)signalatpin

(94)ofIC701chan

gefrom"L"to"H"

level?

CheckIC701.

DoesthebaseofQ

951changefrom

about2.0

Vto5.0

V?

CheckQ

951andallthewayupthru

toQ952.

Is5Vsentoutofthe

emitterofQ951?

CheckQ951andtheAT5Vline.

Checkperiperalcircuitsforpoor

soldering.


42/8442


FLOWC

HARTNO.12CA

PSTANMOTORTROUBLESHOOTING

Thecap

stanmotorfailstorun.

Isthevoltagemorethanabout2.6

V

DCgivenoutofpin(32)ofIC701.

CheckIC701.

N

O

N

O

N

O

N

O

N

O

YES

YES

YES

YES

Y

ES


pin(8)ofMCconnector?

CheckPC5Vline.

Isthevoltagemorethan2.6

VDC

sentinpin(4)ofMCconnector?

CheckbetweentheMCconnector

andallthewayupthrutopin

(32)

ofIC701.

Isthevoltageatpin(3)ofMC

connector1.6~2.7

V?

Checkbetweenthepin(60)ofIC701

andallthewayupthrutopin(3)of

MCconnector.


pin(5)ofMCconnector?

CheckAT12Vlineandmotorvoltage

selectorcircuit.

(Q955~Q958).

Replacecapstanmotor

.

FLOW

CHARTNO.14DRUMMOTORTROUBLESHOOTING(2)

Thedrummotorrunsonlyforafewseconds.

IsdrumPGsignalgivenoutofpin

(5)ofMEconnector?

Checkdrummotor.

Checkbetweenpin(5)ofME

connec

torandallthewayupthruto

pin(66)ofIC701.

IsdrumPGsigna

lgivenoutofpin

(66)ofIC701?

IsdrumPGM.M.

signalgiventopin

(81)ofIC701?

CheckIC701.

ReadjustR724.

(HEAD

SWP

OINTcontrol)

IsH.S

W.

pulsegivenoutofpin(23)

ofIC701?

CheckIC701.

Replace

IC701.

YES

YES

YES

YES

NO

NO

NO

NO

YES

YES

YES

YES

YES

NO

NO

NO

FLOWC

HARTNO.15HEADSWITCHINGPULSETR

OUBLESHOOTING.

Noheadswitchingpulse.

SeeFL

OWC

HARTNO.1

3,1

4.

(DRUM

MOTOR

TROUBLESHOOTING(1),(2))

Isthedrumm

otorrotating?

IsthedrumPGsig

nalanddrumFG

signalpresentonpins(66)and(65)

ofIC701,respectively?

AretheredrumPGM.M.s

ignalatpin

(81)ofIC701?

CheckC

723andreadjustR724.

(HEADSW.

POINTcontrol.)

CouldbelinesbetweenADplug

andIC701.

Checkdrummotorandthebetween

ADtoMEharness

.

ArethedrumPGanddrumFG

signalspresenton

pins(3)and(5)of

ADconnector?

ReplaceIC701.

FLOWC

HARTNO.13DRUMMOTORTROUBLESHOOTING(1)

Thedrummotorfailstorun.


V

DCgivenoutofpin(31)ofIC701.

CheckIC701.

NO

NO

NO

YES

YES

Checkbetweenpin(31)ofIC701

andallthewayuptopin(1)

ofME

connector.


V

appliedatpin(1)ofMEconnector?


pin(4)ofMEconnector?

Replacedrummotor.

CheckAT12Vline.


43/8443


FLOWC

HARTNO.16DRUMSERVOTROUBLESHOOTING

Drumservodoesnot

function.

CheckperipheralcircuitofX701.

Isthere14.2

MHzoscilla

tionatpins

(37)and(38)ofIC701?

NO

InPB

mode

YES

InRECmode

IsthedrumFGsignalatpin(65)of

IC701present?

Isthereferencesigna

l(V-SYNC)

atpin(50)ofIC701?

YES

NO

NO

Checkcomposit-sync

signalline.

(C770-1,

R770)

CheckdrumFGsignalline.

Istheheadswitchingpulseatpin

(23)ofIC701present?

NO

SeeFLOWC

HARTNO.1

5.

(HEAD

SWITCHINGPULSETR

OUBLE

SHOOTING.)

YES

YES

Isthedrumerroroutputa

tpin(33)

ofIC701.

NO

ReplaceIC701.

YES

YES

Isthdrumcontrolvoltage

appliedto

pin(1)ofMEconnector?

NO

NO

NO

Ispin(31)ofIC701inhigh

impedance?

CheckharnessbetweenA

DandME.

ReplaceIC

701.

Replacedrummotor.


44/8444


1

2

FLOWC

HARTNO.17CAPSTANSERVOTROUBLESHOOTING

Capstanservodoesnotfunction.

AreRECand/or

PBmode

inoperative?

OnlyPBmodeinoperative

YES

YES

On

lyRECmodeinoperative

Checkcomposite-

Syncsignalline.

(C770-1,

R770)

DoestheV

-SYNC

signalappearat

pin(50)of

IC701?

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

ReplaceIC701.

IsthereRE

CCTL

signaloutp

utat

pins(74)a

nd(75)

ofIC701?

Doesthec

apstan

FGsignalappear

atpin(67)

of

IC701?

Isthereoscillated

14.2

MHzat

pins(38)and(37)

ofIC701?

Checkperipheral

circuitofX701.

Checkbetween

capstanFG

signal

lineandthe

AC-MCha

rness.

Isthereca

pstan

errorsigna

latpin

(34)ofIC7

01?

Doespin(32)of

IC701operate

normally?

Check

"1"

Check

"2"

Replace

IC701.

Checkcapstan

motorunitand/or

replace.

Istherecapstan

errorsignalatpin

(34)ofIC701?

DoesPBCTL

signalappearat

pin(76)ofIC701?

(TP204)

ReplaceIC701.

ReplaceAA-MH

harness

ReplaceA/Chead.

IsAA-MHharness

good?

DoesA/Chead

opratenormally?

Adjusttheheight

oftheA/Chead.

YES

YES

YES

YES

NO

NO

NO

NO


45/8445


PictureE-Edoesnotappear.

Isp

icturesignalinputintoIC201pins30and31?

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

1Externalinputmode

Checktheline

betweentherearvideoinputterminal

andIC201pin

30.

2U

/Vtunermode

Checktheline

betweentheU/Vtunerpin25and

IC201pin31.

Ispic

turesignaloutputtotheIC201pin52?

IspicturesignalinputintotheIC701pin49?

IspicturesignaloutputtotheIC701pin47?

CheckthelinebetweenIC201pin5

2and

IC701pin49.

CheckthelinebetweenIC201pins63and62

andIC701p

ins56and57.

Ispicturesignaloutputtotheemitterofvideoou

tput

buffe

r(Q251)?

1L

ineoutput:C

heckQ251peripheryandoutputterminalperiphery.

2R

Foutput:Ch

eckQ251peripheryandtuner(pin6)periphery.

Is5Vapplied

totheIC201pins12,61and90?

Is5VappliedtotheIC701pin51

?

CheckthePC5Vline.

ChecktheAT5Vline.

IsserialdataclocksignalappliedtotheIC201

pins63and

62?

C

heckQ251periphery.

FLOWC

HARTNO.18


46/8446


Picture(luminance)record

isimpossible(E-Emodeispossible).

Althoughpictu

rerecordispossible,

colordoesnotappear(E-Emodeispossible).

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

Isluminancesignal(approx.

0.5

Vp-p)inputtotheIC201pin19?


0.3



0.5



0.5



0.5


YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

Istheluminancesignal(approx.

0.5

Vp-p)inputandoutputtotheIC201

pins13and14,

respectively?

CheckbetweentheIC201

pin18

andpin19.

(CheckC206.)


pin21

andpin42.

(CheckC208.)

Check

betweentheIC201pin60

andpin46.

(CheckC512.)

Check


andpin35.

(CheckR505,

C512.)


pin39

andpin26.

(CheckC212.)


pin24

andpin23.

(CheckC210.)

Isvoltage5VappliedtotheCCD

sectionpowerterminalIC201pin36?

IsCCDcontrolvoltageapp

rox.

5V

appliednormallytothepin

37from

theIC201pin57?Isclock

signal

(approx.

7.1

6MHz/0.5

Vp-p)for

CCDappliednormallytoth

epin

44fromtheIC201pin69?

ChecktheIC201pins13and

14

peripheralcircuit.

(R201,

R20

2,

C203)

SPmode:IsrecordFMsignal(approx.20

mAp-p)outputtotheIC201pins88and89

(SP1)andpins86and87(SP2)?

EPmode:IsrecordFMsignal(approx.20

mAp-p)outputtotheIC201pins93and94

(EP1)andpins92and91(EP2)?

Checkorreplacethecylinder.

IsPRE/RECVcc5VappliedtotheIC201pin90

?

Isvoltage5Vappliedtothechroma

powerterminalIC

201pin61?

Ischromasigna

l(approx.

143

mVp-p/Burst)in

putintothe

IC201pin46?

Ischromasigna

l(approx.

180

mVp-p/Burst)in

putintothe

IC201pin58?

Check

theperipheryofIC201pin

61and

PC5Vline.

Check

whethertheIC201pins71

and73

oscillate(3.5

8MHz)?

Ischro

masignal(approx.

180

mVp-p

/Burst)outputtotheIC201

pin35?

FLO

WC

HARTNO.19

FLOWC

HARTNO.20


47/8447


Playbackpicturedoesnotappear(E-Emodeispossible).

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

IsV-H.SW.P.appliedto

the

IC201pin81?

Althoughpictureisplayedback,colordoesnotappear

(E-Emodeispossible).

Isvoltage5VappliedtotheCCDsectionpowerterminalIC201pin36?

Iscontrolvo

ltageapprox.5Vappliednormallytothepin37fromtheIC201pin57?IsCCDclocksignal(approx.

7.16MHz/0.5Vp-p)appliedtothepin44fromtheIC20

1pin69?

CheckbetweentheIC201pin24andpin23.(CheckC210.)

Isluminancesignal(approx.0.5








IsFMsignal(approx.0.4Vp-p)

inputtotheIC201pin78?


Vp-p)inputtotheIC201p

in79?

Isluminancesignal(appr

ox.0.5



pin39

andpin26.(CheckC212.)


pin21



pin18


Checkbetween

theIC201pin55



pin79

andpin78.

Istheluminancesignal(approx.0.25

Vp-p)inputandoutputtotheIC201

pins13and14and16,respectively?

Isvoltage5Vappliedtothechroma

powerterminalIC

201pin61?

Ischromasign

al(approx.403

mVp-p/Burst)inputintothe

IC201pin46?

Ischromasign

al(approx.508


IC201pin58?

Ischromasign

al(approx.286


IC201pin54?

Check



Check


andpin35.(CheckR505,C515.)

Check

theperipheryofIC201pin

61andPC5Vline.

ChecktheperipheryofIC

201pin

13and14and16.(CheckC203,

R201-2,L201,C205,R20

3.)

Check

whethertheIC201pins71

and73oscillate(3.58MHz)?

Ischromasignal(approx.508

mVp-p/Burst)outputtotheIC201

pin35

?

CheckV-H.SW.P.line.

ReplaceIC201.

ReplaceIC201.

FLOWC

HARTNO.21

FLOWC

HARTNO.22


48/8448


NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

FLOWC

HARTNO.23Hi-FiTROUBLESHOOTING

NoHi-FiE-E

soundheard.

Audiosignalinputfromtuner.

LineAudiosignalinput.

Isaudiosignal

inputtedtopins(6)

(L-CH),(44)

(R-CH)ofIC651?

Checkline

betweenMTS

decodercircuita

nd

theHi-Ficircuit.

Isaudiosignal

inputtedtopin(61)

(L-CH)and(52)

(R-CH)ofIC651?

Checklines

betweenthe

audioinput

terminalandHi-Fi

circiut.

Areserialdataandserial

clockatpins(31)and(32)of

IC651?

CheckIC651andIC701,and

allth

Documents

Sharp VCR Manual VCA582U