TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1201	No color, resoldered r356	No color. checked cw signal at the collector of q307 whichwas not there. signal was present at the base. i checked the dcvoltage - collector was 18v, that told me that the transistor was notconducting. base voltage was normal (3v) emitter was 2.8v.
SONY	KP5000	Green picture, replaced c323	Severe bright green screen no control.
SONY	KP5000	Shut down, replaced c5112	Immediate shut down - no high voltage.
SONY	KP5000	Dead, bushing on vert output was carbonized	Unit cannot be turned on. when the power switch is activated,unit comes on for 2 seconds and goes off. checked and f6103 was foundopen. 120v line was loaded. when i checked resistance from 120v b+ toground, i read 150Ω both ways. ga-9 (plug) pin
SONY	FX310	No audio	No audio - any function. acts like bad function switchbecause if applied additional pressure on knob volume works - releaseknob - no audio.
SONY	TPSL2	Defective motor	Tape player would not run. motor seemed to draw excesscurrent. a check of the motor revealed the fg winding was shorted to themain winding.
SONY	TPSL2	Weak battery spring	Customer complaints of wow while tapping the unit (i found 4units with the same problem).
SONY	TCM280	Misprint in s/m	On page 23 of tcm-280/280b service manual a part numbermisprint exists. -hq comments: the correct part numbers for two diodes are as follows:dm-101 8-745-101-01dm-101a 8-745-101-11the dm-101 substitutes for the dm-101. thus, in this case, the part
SONY	TCK96R	Connection error in manual	The connection point shown for the white wire is incorrect.this should go to the other end of r719. the wiring diagram in themanual supplement #2 is not clear on where this wire connects. also, theblack jumper wire and r707 to the connecting point of t
SONY	TCK96R	Open d604	Unit will only go into fwd plays - all other modesnonfunctional.
SONY	TCK71	Alignment of tape path	Found back tension 3.5 gcm and tape path high at pinch rollerand low at head, causing tape wrinkle.
SONY	TCK61	Missing 2.5mm steel balls	The head deck assy will not move fully into the cassette. inthe case of the tc-k81, the assy jammed in the cassette case, chippingthe erase head.
SONY	TAN88B	Defective c409	Dead. found signs of overheating around c413 and c423 asusual. also found area around r419 scorched from heat.
SONY	SRF80W	Poor connection at q502, d501	Radio would not work on batteries. it would work if placedin case with speakers. power was taken from amplifier unit.
SONY	PST33	Magnet out of position	Platter would not turn. magnet fell out of solenoid detectinglever.
SONY	HMK119	Warped turntable	Record rubs on frame causing drag.
SONY	CFS67	Open r308, motor and function switch	No power in any function. resistor 308 is open, switchfunction is shorted in tape mode and tape motor is at first shorted andthen open. -hq comments: charging current for c305 (1000uf) through the r308 burnsthe r308. we should replace it with other va
SONY	TR3230	Defective q1	No sound output. no sound with tracer at volume control.voltages of emitter to base of q1 were improper.
SONY	TPSL2	Typical wow and flutter on this model	Excess speed variations when the unit was used for jogging.units measured about 0.3% to 0.4% wow anf flutter while at rest, and wouldvary between 0.5% and 0.8% while jogging around the test equipment.
SONY	TCK65	Defective motor	Customer complained that intermittently, unit would lock up,no functions would work. found that intermittently, capstan motor wouldnot start up when power was applied to the unit.