TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCFX505R	Worn thrust bearing	The unit would intermittently produce large amount of wow &flutter in the reverse direction. we traced the problem to the capstanthrust bearing. the plastic had lost its spring and was permittingexcessive thrust play.
SONY	TAV7	P/n error in manual	P/n for ic401 is incorrect in manual. ic401 = upd553c244p/n per manual 8-759-101-01 = cx10032correct p/n 8-759-101-10 = upd553c244 -hq comments: we will issue a t/n and s/b.
SONY	STRVX550	Processor lost memory	At approx. 30 day intervals, this ic would lock-up in itsprogram and require a manual resetting. this occurred even after itsreset and hold periods had been changed by 0.22mfd capacitors.
SONY	STRVX6	Missing p/n in manual	Part number for c801/c802 4700ufd 63v not listed in s/m. -hq comments: please note c801/c802 p/n for 4700mfd 63vdc mainelectrolytic capacitors. p/n is 1-123-302-00. we will issue a t/n soon.
SONY	STRVX6	Temperature sensitive components	Intermittent noise in fm mode only, noise will last for 10 to40 seconds in the first hour of use. after an hour the unit will notexhibit this problem again while playing.
SONY	STRVX4	Bad c854 capacitor	The tuner control acted erratically. sometimes the displaywould show 77mhz/fm at turn on. at other times the memory scan would beerratic. we found the reset pulse at pin 7/ic401 to be insufficient.the trouble was traced back to c854 which had dried ou
SONY	RS20	Malfunctioning rotating det	The unit does not rewind all the way to the beginning of thetape, when trying to record ogm. then the tape stops and the ready led(d601) blinks and a beep sound is emitted.
SONY	PSLX500	Incorrect connection of phono ground	When setting volume about half way up, we hear a buzzing soundfrom right channel only. the ground lead of right channel cartridge leadis connected to ground of system control board ground. we are picking upmicroprocessor noise via this ground lead.
SONY	MTL10	Loading mechanism jams	After a month or two, the loading lever does not enter intothe groove on the cam gear. this in turn causes the loading mechanism tojam and subsequent inoperation of the unit. -hq comments: check for slippage between gear a (item no. 3), o-ring(item no.
SONY	CFSF11S	Play mode will not operate	Unit locks up when put in play. head deck appears to bebinding. everything seems to be free when taken apart. need operationalprocedure and troubleshooting guide. -hq comments: check if the nr slider moves. if not, check the fwd camgear and the reve
SONY	CFSF11	Cracked gear	Cracked gear.
SONY	CDP701ES	Removal of shorting clip	Even though new opb was installed, unit did not operate.
SONY	CDP701ES	Chucking motor switch not engaged	The unit rejected the disc intermittently. opened the unitand found the chucking operation was not done, when we closed the disctable.
SONY	XR25	Replacement part is too small	Per hq's comments for my fpr, i ordered the sub. spring(p/n 3-317-637-01). but it is too small as a sub for the original(p/n 4-303-774-xx). -hq comments: 3-434-137-02 is a correct number. kcp does not have instock presently. we will issue a t/n soon.
SONY	XR15	Poor contact at connector	Intermittent audio (fm only). this was present w/radio andtape modes. i have seen two xr-15s with this problem.
SONY	WMD6	Dirty switch contacts	We have been seeing guite a few units with low voltage onplayback. the problem is caused by dirty contacts on s902/playback mute.a little emery paper and a drop of lubricant (tv tuner type) resolvedthe problem.
SONY	WM7	Switches not in place	Cp801 latches up. grounding emitter of q303 resets system,when condition appears. -hq comments: after a command such as rew is activated, feedback tothe cp801 control circuit on the flex board must return or the cp801latches up. the feedback for the c
SONY	TCK60	Loose bushings	Distortion on p/b with 3kc ws-48b. speed ok but sounds likean electronic oscillation problem.
SONY	TCK60	Bushing post cap wears off	A varying drag on the supply reel causes wow and flutter.
SONY	TCFX500	Worn capstan bearing	The customer complained of an intermittent pop in bothchannels when playing the tape in the reverse direction. we found thecapstan bearing (reverse direction) to be providing a poor ground.