Sony TV Repair: Common Faults and Solutions.

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Sony Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	STRV55	Wire numbers are reversed	Incorrect wire number. numbers #1 and #3 reversed.
SONY	STRV35	Defective outputs	The npn output transistor opened on one channel of each of these receivers. no other problems found.
SONY	STRV2	P/n for glass	Cases of concealed damage to front glass on these models havebeen reported. present solution is to replace entire front panel assemblybut it is costly. -hq comments: a similar situation developed on the str-4800sd, -5800sd,-6800sd models 3 years ago.
SONY	STR7065	Protection transistors reversed	Burned main amplifier board was replaced (x-482-232-50).amplifier clipped at 1 watt out.
SONY	STR212	Defective ic20, 301, q301, 302	No am or fm - ic201 voltages incorrect, q301 collector read 11volts. replacement of individual ic, would knock the other chip out.
SONY	STC7000	Adjustment needed	The maximum deflection on tuner input meter did not correspondto center channel on tuning meter. adjustment of fm discriminator and fmif was unsuccessful.
SONY	SQA2030	Defective q701	Noise in back channel outputs. -hq comments: replaced regulator transistor q701, 2sc1124.
SONY	PSX70	Weak motor	Tone arm would not complete return and play cycle wouldstop widway most times.
SONY	PSX40	Defective mgh	Turntable speed erratic. maximum output from mgh was 15-20mvp-p. even slight readjustment of the head caused it to scrape theplatter.
SONY	PSX30	Loose lead on c101	Frequent slowing down of motor. found one lead of c101loose.
SONY	PSX30	Defective detection lever	Scraping noise. cause: detection lever had been jammed underprotrusion on bottom of cam gear in shipping and was permanently warped.this was touching the top of the magnet ass'y on the motor shaft.
SONY	PSX20	Defective ic101	In play mode turntable operates normally, in stop mode (poweron) turntable rotates backwards. in stop mode, ic102-2 output goesnegative 2.1v and inverting input remains slightly positive (pin 6). theoutput of logic pin 6 of ic101 remains at +1 volt. g
SONY	PSX7	Defective q203	Automatic function engages when power is turned on or off, andspeed varies. this only occurs when unit is cold.
SONY	PSX7	Replacement motor will not mount	During troubleshooting, we found that replacement motor(a-460-801-9a) would not mount properly. dimensions of motor shaft andspindle were different.
SONY	PSX6	Open cap c205	After several minutes of operation platter slows down and getsprogressively slower.
SONY	PST25	Spacers to remove	Platter scrapes on side opposite tonearm.
SONY	PS212	Leaky q3	Turntable speed is too fast.
SONY	PS20F	Replacing stylus	The stylus of the moving coil cartridge for the ps-20f isreplaceable. the part number is nd206.
SONY	MDR3L2	Wires break	The distributor (norcal) has reported to me several brokenwires on these units. the wires break at the plug end.
SONY	M200	Spring out of location	Switch sw3 did not move to off position when stop buttonengaged. problem was spring (3-561-626-00) was off at stud end, not slideend.