TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCFX510R	Malfunctioning ic601	This unit would intermittently go into reverse and the counterwas inoperative. we found ic601/system control ic to be defective.
SONY	TC78	Leaky control transistor	There was no sound coming out in pb mode.
SONY	STRVX750	Correct setting of 4/8 ohm switch	Found l802 open twice. upon talking to customer found he wasusing 8Ω speakers. found imp sw on back of unit in 4Ω position. -hq comments: with the 4/8Ω switch in 4Ω position, a loadimpedance of t903 is lower than that in 8Ω position, ma
SONY	STRVX6	Missing p/n in manual	A servicer had a unit with open diodes d901 and d902. thesediodes are the part of the resistor/diode network (cp001) in the pps.the p/n is not listed in the s/m. -hq comments: cp (composite parts) are not stocked. repairs are to bedone by replacing ba
SONY	PSFL9	Irregular guide bar	The unit preformed very well except that when the tone armreturned to the rest position it would vibrate during the last inch oftravel. we found the guide bar to be slightly irregular causing the tonearm to slightly bind and vibrate.
SONY	D5	Malfunctioning crystal oscillator	Only noise was heard in audio.
SONY	CDP400	Malfunctioning ic501	Noise in playback (ticking noise), different frequency ofnoise from different discs.
SONY	CDP400	Loose wire in cn22	Insert disc, runs fast for 15 sec. then ejects servo.circuits check out ok.
SONY	XRM10	No tape ejection	Motor would run at all times and tape was difficult orimpossible to eject. press-fitted pin becomes loose. therefore, themotor keeps running. -hq comments: new part has no notch, which presents the pin from becominloose. you can obtain one from rpc/t
SONY	TTS81	Missing instructions in manual	No instructions are given on how to set tracking force.
SONY	TCFX600	Relay not toggling properly	In playback, when going from dolby off to dolby c, unitbreaks into oscillation in both channels. when going from dolby b, todolby c, no problem. unsoldering either pin 2 or 8 of ic001 cures theopposite channel.
SONY	TCFX7	Incomplete instructions in manual	Page 22 of s/m, instructions for servo adjustment areincomplete. step 7 should refer to pin 21 of ic902 for pulse adjustment. -hq comments: as you pointed out, the tp (silk-screened as speed) isnot shown for the #7 in the adjustment procedures. the pi
SONY	TAN88B	Incompatible v-fets	Replaced v-fets with new ones and power supply fails. butwhen a set of v-fets from another unit are used, unit worked correctly.
SONY	STRVX550	Tape deck plugged into ac outlet on back malfunctions	Tape deck plugged into this unit stops/starts/rewinds etc.automatically and randomly upon power on/off activation. it is notedthis only happens when the speaker grounds are wired together or when unitis used with a speaker switch box that does not have
SONY	PSX75	Defective hall ic d601	The turntable motor did not turn although there was a kickpulse (current) through the motor coil.
SONY	PSX75	No stylus force	The tone arm did not go down and there was no stylus force.
SONY	MTL10	Detection sensitivity adjustment misadjusted	Unit would not line up properly to load the first cassette.
SONY	M100B	Tape jams	The unit jammed the tape intermittently. when it happened,the take up reel was not turning although the capstan and the pinchroller were turning fine.
SONY	ICF7750	Open foil trace	Sound was very low and distorted or there was no sound atall. we found an open foil associated with r41. the foil looked finebut was open. foil repair resolved the problem. although this appearsto be a straight forward repair, it stumped the technici
SONY	CRF320	Bad contact on ss-6 switch	The unit came in with very poor sensitivity in am, sw and lw.checked and found there was almost no local oscillator signal at thecenter tap of ift201 in the second mixer circuit.