THE Hafler SE120POWER AMPLIFIER

SERVICE MANUAL

HAFLERA DIVISION OFROCKFORD CORPORATlON613 SOUTH ROCKFORD DRIVE TEMPE, ARIZONA 85281

SPECIFICATIONS

POWER RATING:Less than 0.006% total harmonic distortion at any

power level up to 60 watts continuous average power perchannel into 8 ohms at any frequency between 20 Hz and20 kHz with both channels driven.

IM DISTORTION (IHF):Less than 0.005% from 1 to 60 watts, each channel,

into 8 ohms.

TYPICAL THD AT 60 WATTS INTO 8 OHMS:20 Hz: 0.002%1 kHz: 0.002%20 kHz: 0.006%

FREQUENCY RESPONSE INTO 8 OHMS:-3dB, 4Hz to 2OOkHz at 1 watt.

+OdB, -0.5dB, 1OHz to 4OkHz at 60 watts.

TYPICAL CHANNEL SEPARATION:2OHz: > 75dB1kHz: > 85 dB20kHz: > 65dB

SIGNAL TO NOISE RATIO, UNWEIGHTED:Exceeds 1OOdB referred to 60 watts into 8 ohms.

INPUT IMPEDANCE: 22,000 ohms

INPUT SENSITIVITY:1.1 volts rms for 60 watts into 8 ohms.

DAMPING FACTOR:100 to 1kHz into 8 ohms, 50 to 1OkHz into 8 ohms.

POWER CONSUMPTION:60 watts both channels into 8 ohms: 300 VAQuiescent: 60 VA

SIZE: 3-1/4” high plus 1/2” feet, 17” wide, 9” deep.(83 mm high plus 152 mm, 432 mm wide,229 mm deep.)

NET WEIGHT: 18 lbs. (8.2 kg)

SHIPPING WEIGHT: 20 lbs. (9.1 kg)

Stereo/Mono Channel Operation:The SE120 delivers 60 watts continuous average power perchannel into 8 ohms. It can be bridged for single channeloperation producing up to 120 watts of power into 16 ohms.

Input Mode Selector:This switch will allow the user to specify the input signal tothe amplifier.

A. Stereo Mode:This allows the right and left channels to reach theirdesignated amplifier channels. This mode will delivermore than 60 watts into an 8 ohm load.

B. Mono Mode:The SE1 20 can be operated in a bridged mode which drivesboth channels with the same signal and combines to delivermore than 150 watts into 8 ohms. This disables the rightchannel input and routes the signal through the left channel.

Construction:The simplified construction of the SE120 improves relia-bility and results in consistent performance. The heavyduty case construction on the SE120 will provide years ofdurability and trouble free protection.

Gold Plated RCA Input Connectors:This provides the most accurate signal transmission andlowest possible loss. Gold-plated terminals are immune tosignal deterioration with time that can be caused by corro-sion in the connectors.

Speaker Output and Power Connectors:For minimum loss power transfer, high definition andoxidization resistance.

Protection System:The SE120 is equipped with a unique protection systemthat constantly monitors the temperature of the outputdevices and takes corrective action to prevent damage tothe amplifier as a result of excessive overheating.

ALL SPECIFICATIONS SUBJECT TO CHANGEWITHOUT NOTICE.

@ Copyright 1990. All rights reserved

-l-

LINE CONNECTIONS AND SWITCHING

The SE120 is normally wired for use on 12OV AC powerlines, as in the U.S.A. If your line voltage is different, youwill need the special Hafler export power transformerwhich accommodates many other line voltages. Be sureyour amplifier is wired for your line voltage before you plugit in.

The SEl2O’s power switch may be left on, and theamplifier switched remotely by connecting its line cord tothe preamplifier (or other control center) which provides aswitched AC outlet. Make sure that the control device cansupply a current of 5 amperes to the SE 120, in addition to thecurrent required by any other switched units. You mayinstead connect the amplifier directly to a wall outlet, andcontrol it with its own front panel power switch.

CONNECTING CABLES GROUNDING:

INPUT:Conventional shielded cables, often supplied with pre-

amplifiers, may connect the control center to the amplifier’sinput jacks. Be sure the cables are not frayed or looselyconnected to the plugs, and that the plug’s outer shieldconnection is tight on the jack, to avoid hum. If you wish toinstall the SE120 more than a few feet from the preampli-fier, the permissible cable length to avoid loss of highfrequencies is determined by the preamplifier’s output im-pedance and the internal capacitance of the cable. If theoutput impedance is 600 ohms or less, as with Haflerpreamplifiers, and the cable capacitance is less than 50picofarads per foot, up to 50- feet is acceptable. Ordinarystereo interconnecting cables often have higher capaci-tance, however, so a good quality low capacitance shieldedwire should be used. When making long runs, keep the leftand right cables close together, and avoid running themparallel to power wiring to reduce the likelihood of humpickup.

OUTPUT:The wires which connect the speakers to the amplifier

should be of sufficient size to preserve the SEl2O’s highdamping factor. Standard #18 gauge lamp cord is satisfac-tory for up to 15 feet if your speakers are of 8 ohms or higherimpedance. A heavier gauge (#16 or larger) wire should beused with 4 ohm speakers or 8 ohm speakers at a greaterdistance. Special loudspeaker cables which have adequatethickness to accommodate long runs are usually availablefrom audio dealers. The SEl2O’s red and black outputsaccept standard banana plug connectors, including thedouble ones with 3/4” spacing. These are the most conven-ient to use if you will be disconnecting the speakers occa-sionally. The terminals will also clamp a spade lug, or a barewire through the hole in the center post. Be sure there are

no frayed wire ends which could touch adjacent terminalsor the chassis. Tin bare wire ends with solder to secure allstrands.

PHASING:Consistent phase relationships are important when con-

necting speakers in order to enable full bass reproduction aswell as midrange and high frequency time alignment. Tobe sure all speakers in a system are wired in phase to theamplifier, each ground or - speaker terminal should beconnected to its black ground tenninal on the SE 120 and thespeakers + terminal to the corresponding red binding post.Speaker connecting cable identifies one wire from the otherby the color of the wire, or by marking or coloring theinsulation. NOTE: In the special case of monophonicoperation of the SE 120, (described later) different speakerconnections are employed.

The black output terminals of the SE120 are connectedtogether internally and grounded to the chassis. Thisfacilitates the use of external devices which use a commonground connection, such as some headphone junctionboxes.You must be sure that the ground or shield connection fromsuch a device goes to a black terminal on the SE1 20.NOTE: No such connection may be made when the SE120is connected for bridged mono operation.

CONVENTIONAL STEREOCONNECTIONS

It is best to make all connections with the SE120switched off. Each of the stereo speakers connects to onehorizontal pair of red and black outputs, as identified left orright on back of the SE 120. The input signals connect to thecorresponding input jacks, and the mono/stereo switchshould be set to stereo.

CONNECTIONS FOR MONOPHONICOPERATION

When you wish to drive a single loudspeaker withincreased power capability, the SE120 can be operated ina bridged mode which drives both channels with the samesignal and combines their output to deliver more than 120watts into 16 ohms. In this arrangement, the speaker isconnected only to the two red output terminals. The left redterminal is + and the right red terminal is the - connection.NO CONNECTIONS MAY BE MADE TO ANY BLACKTERMINAL!! Set the Input Mode Selector switch tomono, and connect the input signal to the left channel inputonly. IMPORTANT NOTE: Never use a speaker with animpedance of less than 8 ohms when operating the SE120

-3-

in the bridged mono mode. The increased current couldoverheat the amplifier.

OPERATION

The pilot lamp in the power switch will glow wheneverpower is applied to the SEl20. If it does not light, check fora blown AC line fuse.

The SE 120 is equipped with a unique protection systemthat constantly monitors the temperature of the outputdevices and takes corrective action to prevent damage tothe amplifier as a result of excessive overheating. Undermost conditions, the SE120 heatsinks will dissipate theheat required to maintain safe operating temperatures, andthe unit will play continuously. If the amplifier is driven athigh volumes into speakers with an impedance of less than8 ohms, and/or there is inadequate ventilation, the heatsinkscould heat to a level that would cause the protectioncircuitry to shut off the amplifier for a short time (normallyless than 15 seconds) to prevent damage. The SE120 willreturn to normal operation, and if the overheating conditionis still present, the cycle will repeat. In this case, check thesurroundings of the unit to insure sufficient air flow aroundthe heatsinks and through the vent holes. Otherwise, checkthe load impedance connected to the outputs to see if it isfar below 8 Ohms.

FUSES:

The SE120 is supplied with a 5 Ampere Slo-Blo AC linefuse and four power supply fuses. If one of these fails, it isusually indicative of a fault which will require professionalservice.

Bias current adjustment for the SE 120 needs to beperformed in the following manner:

1. No signal applied to the input, no load on the output ofthe amplifier.

2. Line voltage to the amplifier should be set at thenominal value for the area.

3. Adjust one channel at a time.4. With the unit off, remove either the + or - rail fuse

5

in the right channel. Insert the ammeter across thefuse holder. Make sure that the ammeter is set atits highest current scale.Turn the unit on and, after the unit has warmed upfor approximately one minute, adjust the ammeterreading for lOOmA. Turn the unit off. AlIow theunit to discharge before removing the ammeter andreplacing the fuse.

6. Repeat steps 4 and 5 for the left channel.

TRANSISTOR VOLTAGE VALUES-DC volts with respect to circuit ground,no signal applied.

NAME Emitter Base co llector

Ql -.755 -.130 51.5Q2 -.756 -.159 51.7Q3 52.3 51.7 51.5Q4 52.3 51.8 51.8Q5 51.4 50.9 -12.90Q6 52.1 51.5 50.5Q7 51.0 50.4 1.294Q8 -1.157 -.532 1.314Q9 -51.4 -50.7 -1.151QlO -.578 -1.153 -53.5Qll .711 1.303 53.5Q14 -.737 -.126 51.5Ql5 -.755 -.130 51.5Ql6 -.756 -.159 51-7Q17 52.3 51.7 51.5Ql8 52.3 51.8 51.5Ql9 51.4 50.9 -12.90Q20 52.1 51.5 50.5Q21 51 .0 50.4 1.294Q22 -1.157 -.532 1.314Q23 -51.4 -50.7 -1.151Q24 -.578 -1 .I53 -53.5Q27 -.518 -.088 -53.8Q28 -.737 -.126 51.5

Q12Ql3Q25Q26

Source Gate Drain.778 .087 53.8

-.518 -.088 -53.8.778 .087 53.8

-.518 -.088 -53.8

IC VOLTAGE VALUESICPIN #

1. -48.92. -52.23. -49.74. -53.96. -52.17. -48.78. -38.5

-DCV -54.0+DCV 54.0

4-

ELECTRICAL PARTS LISTSYMBOL NOa

RESISTORSR1R2R3R4R5R6R7R8R9R10R 1 1R12R13R14R15R16R17R18R19R20R21R22R23R24R25R26R27R28R29R30R31R32R33R34R35R36R37R38R39R40R41R42R43R44R45R46R47R48R49R50R51R52R53R54R55R56R57R58R59R 6 0R61R62R63R64R65R67

CAPACITORSC 1c 2c 3C4c5C6c 7C8c9C 1 0C11C 1 2C 1 3C14C15C 1 6C 1 7C 1 8C 1 9C20c21C22C23C24C25C26C27C28C29

PART DESCRIPTION PART NO.

1.1kOhms, 1/4w, 1% Metal Film22.1 k Ohms, 1 /4 w, 1% Metal Film47 Ohms, 1/4x, 5% Carbon Film47 Ohms, 1/4x, 5% Carbon Film10k OhmS, 1/4w, 1% Metal Film680 Ohms, 1/4w, 5% Carbon Film10 Ohms, 2w. 5% Metal Film680 Ohms, 1/4w, 5% Carbon Film2.2k Ohms, 1/4w, 5% Carbon Film5.1 k Ohms, 5w, 5% Wire Wound22k Ohms, 1/4w, 5% Carbon Film1 .Ok Ohms, 1/4w. 5% Carbon Film1.1kOhms, 1/4w, 1% Metal Film22.1 k Ohms, 1/4w, 1% Metal Film10 Ohms, 1w, 5% Metal Film27 Ohms, 1/4w, 5% Carbon Film47 Ohms, 1/4w, 5% Carbon Film470 Ohms, 1/4w, 5% Carbon Film10 Ohms, 2w, 5% Metal Film220 Ohms, 1/4w, 5% Metal Film68 Ohms, 1/4w, 5% Carbon Film47 Ohms, 1/4w, 5% Carbon Film10 Ohms, 2w, 5% Metal Film10 Ohms, 2w, 5% Metal Film30 Ohms, 1/2w, 5% Carbon Film2.7 Ohms, 1w, Metal Film10 Ohms, 2w, 5% Metal Film10 Ohms, 2w, 5% Metal Filml.lk Ohms, 1/4w, 1% Metal Film22,1 k Ohms, 1/4w, 1% Metal Film47 Ohms, 1/4w, 5% Carbon Film47 Ohms, 1/4w, 5% Carboon Film1Ok Ohms, 1/4w, 1% Metal Film680 Ohms, 1/4w, 5% Carbon Film10 Ohms, 2w, 5%, Metal Film680 Ohms, 1/4w, 5% Carbon Film2.2k Ohms, 1/4w, 5% Carbon Film5.1 k Ohms, 5w, 5% Wire Wound22k Ohms, 1/4w, 1% Metal Film1 .Ok Ohms, 1/4w, 5% Carbon Film1.1kOhms, 1/4w, 1% Metal Film22.1kOhms. 1/4w, 1%Metal Film10 Ohms, 2w, 5% Metal Film27 Ohms, 1/4w, 5% Carbon Film47 Ohms, 1/4w, 5% Carbon Film470 Ohms, 1/4w, 5% Carbon Film10 Ohms, 2w, 5% Metal Film220 Ohms, 2w, 5% Metal Film68 Ohms, 1/4w, 5% Carbon Film47 Ohms, 1/4w, 5% Carbon Film10 Ohms, 2w, 5% Metal Film10 Ohms, 2w, 5% Metal Film30 Ohms, 1/2w, 5% Carbon Film2.7 Ohms, 1w, Metal Film10 Ohms, 2w, 5% Metal Film10 Ohms, 2w, 5% Metal Film4.7kOhms, 1/2w, 5% Carbon Film100kOhms, 1/4w, 1% Metal Film12.1 Ohms, 1/4w, 1% Metal Film10kOhms. 1/4w. 1% Metal Film33k Ohms, 1/4w, 5% Carbon Film1Ok Ohms, 1/4w, 5% Carbon Film33k Ohms, 1/4w, 5% Carbon Film5.11 k Ohms, 1/4w, 1% Metal Film1 k Ohms, 1/4w, 1% Metal Film22k Ohms, 1/4w, 5% Carbon Film

RMPl4-1101RMPl4-2212RCl4470RCl4470RMP/4-1 W2RCl4-68 1RM2-1 Wtw4-681RCl4-222RWB5-SXZRCi4-223RCI4-102RMPi4-1101RMP/4-2212RM2-1WRC/4-270RCI4470RCI4471RM2-1 WRC/4-221RCi4-680RCi4470RM2-1 WRM2-1 WRC/2-300RMl-027RM2-1 WRM2-1 WRMPl4-1101RMP/4-2212RCl4470RCl4470RMPl4-lCKt2RC/4-681RM2-1 WRCI4-681RCI4-222RW05-502RCI4-223RC/4- 102RMP/4-1101RMPl4-2212RM2-1 WRCl4-270RCI4470RCI4471RM2-1 WRC/4-221RCl4-880RCI4470RM2-1 WRM2-1 WRCL?-300RMl-027RM2-1 WRM2-1 WRCl2472RMP&lW3RMPl4-1212RMPi4-lW2RU4-333RU4-10RCt4-333RMP/4-5111RCI4-1 W2RCI4-223

2.2 rnfd, m, 20%, Polypfcpybne220 pfd, 75~. 10%. Polflropylene330 pfd, 63Ov, 3%, Dii Mica100 tid, Non-Polar Radial47 pfd, 65Cv. 3%. D@jwd Mica220 pfd, 75~. 10% Polypwylene3pfd.5Wv.D@)edMkaO-W1 tid, 25Ov, 1% Pofypropytene100 tid, 50~. 209& Pofar/Electrolyric0.1 IT&l, 1Wv. 2Ix& Pofyester0.1 r&l, vxht, 20%$ PWesler0.33 rrtd, l%Ov, 10%. Polypqylene0.1 tnfd* lWv, m PofyesIer100 rrfd, 50~. 20% Pohr/ElecUolytic0.1 mfd, low, 20%$ PoIyeslef0.1 mfd, lUZv, m Pofyester220 pfd, 75~. 10%. Polyprcpylene330 pfd, 63Qv, 3%. Dipped Mica100 nfd, Non-Polar Radial47 pfd, 65Cv. 3%. D@ped Mica220 pfd, 75~. 10%, Polypropylene3pfd.=O’&DbpedMkaO-W1 tid, 25&, 10%. Pwene100 tid, 5@u, 209& Polar/Electrolyric0.1 mfd, lWv, 209& Polyester0.1 mfd, 1Wv. zn& pofyester0.33 rrfd, 16Ov, 10%. Pe0.1 rw, loOv, 20% Pofyester1 W tid, 50~. 20%. PotarIE~rotytic

CPP-mCPP-221CM-331CERNP-107CM470CPP-221CM-CPP-102CER-107CCP-104ACP-104ACPP-333CP-104ACER-107CCP-104ACP-104ACPP-221CM-331CERNP-107CM470CPP-221CM-030CPP-102CER-107CCP-1wACP-104ACPP-333CP-104ACER-107C

SYMBOL NO.C30c31C32C33C34c35C36Cl01Cl02

TRANSISTORS01

zQ4a 5

:

:010Q11012Q13a14Q15016a17018Q19Q20M lQ22Q23Q24Q25Q26Q27Q28

DIODESCR1CR2CR3CR4CR5CR6CR7CR8CR9CR10CR1 1CR12CR13CR14CR15CR16CR17CR18CR19CR20CR21CR22CR23CR24CR25CR26CR27CR28CR29CR30CR31

PART DESCRIPTION0.1 mfd, 100v, 20%. Polyester0.1 mfd, 100v, 20%, Polyester68W mfd, 10/75% Polar/Electrolytic68W Mfd, 1 W5% Polar/Eiectrolytic2.2 mfd, WV, 20%., Polypropylene330 pf, 500~. Mica Cap330 pf, 500~. Mica Cap0.01 nfd, 1 WV, 20%, Polyester0.01 rrfd, 1 WV, 20%, Polyester

2N5550 NPN Transistor2N5550 NPN Transistor2N5401 PNP Transistor2N5401 PNP Transistor2N5550 NPN Transistor2N5401 PNP Transistor2N5401 PNP Transistor2N2222 NPN Transistor2N5550 NPN Transistor2N5401 PNP Transistor2N5550 NPN Transistor2SK1056 N-Channel MOSFET2SJ160 P-Channel MOSFET2N5550 NPN Transistor2N5550 NPN Transistor2N5401 PNP Transistor2N5401 PNP Transistor2N5550 NPN Transistor2N5401 PNP Transistor2N5401 PNP Transistor2N2222 NPN Transistor2N5550 NPN Transistor2N5401 PNP Transistor2N5550 NPN Transistor25K1056 N-Channel MOSFET25J160 P-Channel MOSFET2N5550 NPN Transistor2N5550 NPN Transistor

1 N4148 Silicon Diode1 N4 148 Silicon Diode1N4148 Silicon Diode1 N4 148 Silicon Diode1N4148 Silicon Diode1 N4148 Silicon Diode1N4148 Silicon Diode1 N4148 Silicon D i o d e1 N4148 SiIicon Diode1N4148 Silicon Diode1N5204B 10v, 1/2w, 5% Zener1 N5204B 1 0v, 1/2w, 5% ZenerlN4148 Siliin DiodelN4148 Silian DiodelN4148 Siliin DiodelN4148Silicon DiodelN4148 Silium DiodelN4148 Silkon DiodelN4148 Si l icon Di ilN4148 Sifiw DiodelN4148SiIiwrlDiodelN4148 Silicon DiodelN4148 Siticon DiodelN4148 Silicon DiodelN4148 Silicon DiodelN5204B lm, 1/2w, 5% ZenerlN52048 10~. 1/2w, 5% ZenerlN4148 Siliam Diode1N4140SiliaxlDiodelN4148SilfaxlDiode1 N5245B 15~. lf2w. 5% Zoner

TRANSFORMERST101 Domestic TransformerT102 Export Transfomer

THERMISTORSTS1 Thermistor MEPCO#2322-640-63103TS1 Themistor MEPCO#2322-640-63103

FUSESF1 4A, AGCf3AGF2 4A. AGU3AG

E4A. AGU3AG4A. AGU3AG

F101 5A Slo-Blo AGC Fuse

MISCELLANEOUSP l 1 k Ohms, variableP2 500 Ohms, variableP3 1 k Ohms, vari&leP4 a Ohm, varwe

z6 Mkrohenry, inductor6 &rohenry, lnduuof

DBlOl DiodeBrfCbe,25ASlOl wayswitch

9-

PART NO.CP-104ACP-104ACER-698DCER-688DCPP-205CCM-331CM-331CP-103/20CP-103A

SSH-613SSH-613SSH-708SSH-708SSH-613SSH-708SSH-708SSH-611SSH-613SSH-708SSH-613SSH-710SSH-709SSH-613SSH-613SSH-708SSH-708SSH-613SSH-708SSH-708SSH-611SSH-613SSH-708SSH-613SSH-710SSH-709SSH-613SSH-613

SS-162SS-162SS-162SS-162SS-162SS-162SS-162SSl62SS-162SS-162SSH-600SSH-600SS-162SS-162SS-162SS-162SS-162SS-162SS-162SS-162SS-162SS-162SS-162SS-162SS-162SSH-600SSH-600SS-162SS-162SS-162SS-212

TT-P125TT-P125E1A

SSH-730ssn-730

FS-004FS-004FS-004FS-004FS-005SB

RVH-102RVH-501RVH-102RVH-501TT-6.0TT-6.0SSH-629SWH-144

CABINET ASSEMBLY PARTS LIST

REFERENCENO.A.

B.

C.D.

E.

F.

G.

H.

I.

J.

K.

L.

M.

PART NO. DESCRIPTION

SM-1103PlTT-P125

TT-P125E

HWH-295

WP-PC58K

SM-8103AB

HS-SEl2OP

SM-3102P3

HWH-134

SM-2103S2

HWH-295

HWH-290

SWH-144

FA-LOGO SE120

Cover - SE120

SE120 Domestic transformer screw

SE120 Export transformer

#10-32x1/2 hex socket head screw

PC-58 board kit - SE120

L-bracket - SE120

Painted heatsink - SE1 20

Faceplate - SE120

(6) 1/2 sm hex socket head screw

Chassis - SE120

#10-32x1/2 hex socket head screw

Standoff post

On/off switch

SE 120 overlay

-lO-

OPEN FACE VIEW

OF SE120

-ll-

PACKING ASSEMBLY PARTS LIST

SYMBOL PART NO. DESCRIPTIONNO.

A.

B.

C.

D.

INSTAPACK PACKING FOAM

LIT-I 20M SE1 20 INSTRUCTION MANUAL

FG-SE120 120 AMPLIFIER

PM-701 BOX-SE1 20

LIT-WAR WARRANTY CARD

0D