TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	SPP11H	Open q4	Noise from hand unit in talk mode even with base-unit powered.
SONY	SPP11	Defective ic2 ne567	Base unit would not respond to any function from hand unit.in use light did not light, would not dial out. found ic2 pin 8 wouldnot go low.
SONY	RT66	Defective reel motor	This unit had poor ff/rew torque and would stall when using90 min tapes.
SONY	RS30	No shut off after the caller hung up	This unit would take one minute and sometimes more to shut offafter the caller hung up. there would be just a dial tone recorded on thetape. about every 15 seconds the unit would try to hang up. there wouldbe a click recorded on the tape but then the
SONY	PSX55	Broken contact on switch cam	The tonearm on this unit would not move in to the edge of therecord all the way or set down. we noticed a slight amount of friction inthe tonearm travel. disassembly revealed a broken contact on the switchcam (the electrical feeler that contacts the ca
SONY	PS333	Defective pitch control	Neither 33 or 45 rpm would lock in. speed was excessive.voltage were correct.
SONY	PCMF1	Defective d102	Left channel was noisy - rec level control had minimal effecton noise - input signal was weak and distorted - line amp had some dcoffset at input to lpf - found constant current diode d102 breaking down.when testing this diode on a curve tracer using a 1
SONY	ICF9540W	Defective q1	This unit had poor sensitivity and distorted output in thefm mode. we found the rf amp to be defective.
SONY	CFM200	Missing part number	The p/n for the mechanism chassis is missing from the servicemanual. however, the chassis from the cfs-400 appears to be very similar,this chassis is p/n a-3102-043-a. are these two chassis the same?the part for the cfm-200 was researched by kc with ne
SONY	CDP101	Unit out of adjustment	Unit would skip on 2nd track and 5th track.
SONY	CDP101	Would not read toc	Would not read toc. i could hear something rattling insideunit when i took it out of the box. i found one screw inside that shouldhave been in the sled motor bracket. after correcting this, it still didnot read disc. output of ic403 (eye pattern) was
SONY	CDP101	Stuck objective lens/coil assembly	The disc would eject before the toc could be read. focusdc drive out of ic204 (tp 10) was correct, but the objective lens in thetop was not moving.
SONY	XR77	Defective ry301	The left channel would intermittently cut out on am/fmfunctions during first 5-10 minutes. this at first appeared to be causedby a defective semiconductor. further examination revealed relay 301 tobe the cause. heating and cooling the relay confirmed
SONY	XR77	Defective q105	The left channel fluctuated between distorted low output andno output. we found q105 (muting transistor) leaky.
SONY	XR70	Error in manual	Terminal marking for q303 as shown on pc board incorrect(emitter and base leads reversed.) the picture on page 6 of the servicemanual (supplement #1) is correct but it does not match the silk screenon the pc board.
SONY	WMD6	Pinch roller support needed bending	C-90 tape (tdk) would not run properly through capstan andpinch roller. problem existed only on tdk 90 minute tapes. hi freq.would drop out-left channel would decrease in volume. tape wrinkleevident at capstan. pinch roller and capstan replacement do
SONY	TCK777	Poor chassis ground connection	Low level hum in output.
SONY	TCK55	Defective relay	Right channel meter erratically pegs accompanied by loud hum.
SONY	TCK44	Q310 shorted	This unit had a squeal in the left channel, about 5 khz, itfirst appeared to be a ground problem but closer examination revealedg106/q206 muting transistors to be partially turned on.
SONY	TCFX500R	Bent tab on head chassis	Head deck would cycle up and down about 3 times after fwd button was pushed, then there would be a graunchy noise and deck would go into ff.