TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCFX33	Defective c580	The ams solenoid would not consistently engage which resultedin the transport not locking into the play mode. we found the solenoidpre driver not turning on hard enough. c580 had appreciably decreased invalue which did not allow the base of c580 (sol.
SONY	TCFX30	Defective reel motor	Motor noise was audible through the right channel. this was caused by excessive sparking of one of the brushes in the reel motor.
SONY	TCFX4	Defective relay	One channel intermittently records and the sound duringplayback is muddy.
SONY	TCFX4	Defective rv104	The right meter on this unit stays on with all led'silluminated. we found rv104 (meter adjust pot) open.
SONY	TAF70	Defective input jack	This unit had an intermittent hum on the phono input. wefound the input jack to be defective.
SONY	STRVX22	Defective ic301	This unit was locked on aux. we found pin 26 of ic301 have asteady 5.4v.
SONY	STRVX6	Defective ic401	This unit had no display or tuning action on am/fm.
SONY	STRVX6	Dead	Dead unit. output transistors were shorted causing pulsepower supply to fail - replaced known defective components restoredoperation but bias current, after adjustment would start to increasecausing outputs to run hot. removed power before damage resul
SONY	STRVX6	Overheating regulator	The +15v regulator overheated to the point where it burntthe board badly. after replacing the board and modifying according tothe service bulletin we still had a very hot regulator. how can we coolit down?
SONY	STRVX5	Malfunctioning mute circuit	Upon turning power off, a slight popping sound through bothspeakers will be heard. by grounding inputs of main amp the popping iseliminated. an imbalance in the decaying time of the positive andnegative supply voltages can be seen on the scope. this r
SONY	STRV25	Aged resistors	The customer has owned this unit for 16 months and has hadit serviced by an independent servicer 4 times. she said it would playfor a while and then one or both channels would go out and it would stopworking. the relay would kick out.
SONY	SRF40W	Defective headphone jack	This unit had good separation and power level but the outputwas distorted. it appeared to be an output problem. further examinationfound the headphone jack defective. although this circuit is a simpleone, this problem was misleading.
SONY	SPP11	Open foil trace	No dial out, no dial tone, squelch broken opened base unitand measured voltages. no output from bridge rectifier d-6. found openfoil pattern at output lead of d-6.
SONY	SEH310	Poor solder connection	One channel cuts out intermittently when the space soundfunction was activated.
SONY	PSX65	Defective ic106	All functions inoperative.
SONY	PSX40	Shorting q202	We found the dc amp to be open (cracked) as a result of q202shorting - thus applying 18v to the ic.
SONY	PSFL1	Noise during operation	When the turntable moves in or out there is an objectionalclicking sound.
SONY	MDRFM5	Part number for wire	Wire for connecting head-pieces to main cabinet. need blue,orange and grey colored wire that connects switch board to amp in ear-piece. has to be very small wire and stranded wire to last some time. -hq comments: p/n for 10m lengths are as follows:9-9
SONY	ICFC20W	Defective ic's	When power is turned on, display sets to 1:00 am or pm andwill not set time nor alarm functions. when powered up display will onlyindicated flashing dots - no numerial displays.
SONY	ICF2001	No am	All functions worked except am, found q41 (2sk107) withintermittent lead.