Sony Repair Tips

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Make	Model	Symptom	Problem
SONY	TCM111	Clutch spring causes noise	The mechanical vibrations of the creaking forward clutchwould be picked up by the build-in microphone when recording. the creak -creak - creak sound would be amplified and cause the audio agc to dropdown. the playback would be of the creak - creak - cr
SONY	TC630	Substitution for playback head will not fit	Original part is substituted to pp102-2902e. it will not mountin machine with supplied hardware. -hq comments: part number now correctly subs to 8-829-129-20(pp102-2902)and applies to serial numbers 124,701 and higher. for serial numbers below124,701, u
SONY	TC165	Phase capacitor must be changed	Installed new motor in the machine and after 15 minutes itoverheats. there are 3 units with the same problem. -hq comments: this unit normally operates at 108 degrees f whenreplacing original motor with replacement 8-832-414-11 (ic414s) change thevalue
SONY	TCK75	Tension incorrect	The first section of tape (5-15 minutes) is being wrinkled orcreased. after a certain amount of tape has wound on to the take-up reelof the cassette the problem is eliminated. the wrinkling (transverse)causes drop-out of signal and also loss of high fr
SONY	TCK35	Rough spot on fr limiter	In fwd or rew, when unit gets to end of tape, r1008 will gethot and twice r1008 opened for customer. found flywheel to be almoststopping drawing around 180ma.
SONY	TCK6	Lock plate binding	Eject, f/f and rewind defective, while stop, fwd, record andpause work normally.
SONY	TCK2A	Defective d306	Unit came into fsc with complaint of no record or playback,erase ok both channels bad. power supply check showed correct b+ voltagesfor amplifier circuits. muting transistors q103, 203 were not turningoff. q303 (muting driver) q103, q203 all ok. foun
SONY	TCK1A	Replacement trans don't work	Q101 and q102 (q201 and q202) are both 2sc900e transistors.these were ordered and 2sc1362 were shipped as subs. they do not worknone of the subs listed work. in the parts list of the manual a 2sc1362(8-729-665-45) is listed. -hq comments: the beta ran
SONY	TCK1A	Incorrect p/n	Listed motor on page 24 of instruction manual shows incorrectpart number.
SONY	TCK1A	Crack in pcb	Several units had no indication of record led in record mode.this is not due to defective record led. the problem is caused by a breakin plating, on the record led circuit board.
SONY	TCK1A	Same p/n for different numbers	The p/n for the record button is the same as rew/ff/play. itshould have a diferent number, as the original has a red mark on thebutton and the play/ff/rew do not. -hq comments: this information can be found in the july 1979 technicaldigest on page 4.
SONY	TAN88	Defective components on power supply board	Complaint was intermittent noise in left channel. speakerrelay would not stay on. found l-ch waveform at tp1 at b-level, r-chwaveform erratic.
SONY	TAN88	Broken pcb traces	R-ch won't work.
SONY	TAN8550	Missing connection	Dc balance circuit in class a amp board does not function.due to missing plating in ground line circuit. this in turn supplies dcvoltage on 0 volt line which in turn causes vfet failure. also i feelthat if the value of rt701 22 kΩ dc bias adjustment
SONY	TAF5A	Thermal fuse in transformer	Primary of t503 was found defective. upon removal andinspection, a thermal fuse was found in series with pin 1. there was nosign of heat anywhere in the pps. jumping the fuse restored operation -a new transformer was ordered.
SONY	TAF5A	Defective d363	Unit came into fsc with burned r360 and leaky q352. staticcheck of other components showed no gross shorts or opens.
SONY	TAF3A	Transistors shorting to heat sink	After the output transistors have been replaced, and unit hasplayed, the outputs will go out again.
SONY	TA4650	Dc balance	Dc balance on the speaker outputs is determined by matchingof q302 and q303.
SONY	TA2650	Replacement transistors are improved	Customer complained of noise with volume control at midposition, standard input levels.
SONY	TA2650	Switch out of proper location	No audio output on any function - function switch (s1) wafers180 degrees out.