TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCFX45	Worn thrust retainer	This unit skewed tdk sa and maxell udx tapes at the verybeginning. we found that there was too much play in the capstan. thiswas caused by the plastic thrust retainer becoming slightly distorted.
SONY	TAP7F	Replacement xsistor leads too short	National parts center is substituting 2sa1141 for 2sa1097and 2sc2681 for 2sc2571. the substitute transistors have leads that aretoo short.
SONY	STA7B	Poor solder connections	Intermittent display and stations drifting.
SONY	SPP11	Malfunctioning ic4	When turning s2 to talk position on the hand unit, pin 8 ofic2 in the base unit goes low. to engage the phone line relay ry throughrelay driver q13. the relay did not click.
SONY	SPP11	Leaky diode	Even when there was an incoming signal from tell line jack tophoto coupler, the call tone did not ring.
SONY	PSFL1	Intermittent s6	The unit intermittently would not shut off after the drawerwas fully open. this resulted in the gears grinding. we found s6 to beintermittent. we have also observed that whenever we encounter thiskind of problem that it is necessary to check the mesh
SONY	CFS88S	Burnt switch	Unit has no power or appears to be running on very low supplyvoltage. type of supply (ac, dc internal, or dc external) irrelevant tosymptom. s903 (power switch) has developed high resistance due to contactburning.
SONY	CDP200	Poor contact between clutch and the disc	Unit skips. music comes and goes. noted that tracking errorand sled waveforms would go crazy when problem occurred. tracking errorwould alternate between traverse signal and servo loop signal. we foundthat the disc would wobble just before the proble
SONY	WMF10	Worn take-up reel	Take-up reel drags - causes motor current to exceed 1/2 ampin rwd, and w&f to occasionally rise over 0.25% in fwd.
SONY	WMF5	Open cap on osc circuit	No fm - subbed out osc with generator to verify the fm oscwas dead.
SONY	STRVX550	Missing p/n in manual	Many servicers ask for the part # of the capacitors used inthe hi-fi service bulletin #180.
SONY	STRVX550	Ground connection modification	Tightening ground screen on the main chassis and displayboard does not always resolve the ground problem. the easiest thing todo is to install star washer.
SONY	STRVX550	Static induced onto tv set	When the vx-550 was on and within about 10 feet of a tv (anybrand) static was induced in the picture and sound. we found the multi-vibrator which supplies power to the fluorescent tube filament to be thecause.
SONY	STRVX200	Leaky diode d302	This unit would intermittently lose station (preset) memory.
SONY	STRVX4	Thermally intermittent ic201	The am or fm would periodically become distorted and sometimesmute.
SONY	STRVX4	Open c854	There was no reset pulse for the microprocessor. therefore,the unit acted very strange. for example, memory scan does not go up tomemory 8.
SONY	MTL10	Slide plate sticks	Intermittently the cass. will not retrack back from themechanism to the cass. slider. after unit is unjammed, it will work upto 3 hrs. before failing again.
SONY	CFSF11	Gear on rph shaft cracks	The gear on rph shaft cracks and prevents the head fromturning. if the head turns only part way around, the mechanism will jamand destroy other parts. -hq comments: although the gear is mounted onto the head, the gearcomes with the part as illustrated
SONY	CDP701ES	Rf pll and clv pll out of adjustment	Unit will not track discs with visible defect in program area.some discs track on cdp-101 and cdp-200 with no problem. possible causeof this could be the auto antiskate circuit in the cdp-400 and cdp-701es. -hq comments: careful electrical alignment, p
SONY	CDP200	Rf pll out of adjustment	The unit skipped in play mode.