TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCFX33	Tape transport too noisy	After using above 3 units for 6 months, customers complainedthat the tape transport is far too noisy to enjoy their units. noiseseems to be coming from the plastic gear mechanism. applying some greaseto gears seems to help but not enough to satisfy cus
SONY	TCFX33	No functions	No functions. checked and found supply reel table would notbudge. disassembled tape transport, cleaned and lubricated reel tablespindle (no part number in s/m).
SONY	TCFX7	Part number not in manual	Unit would operate 3 seconds then stop. pl802 was found tobe open. the service manual does not list a part number for the lamp.research thru kansas city located the part number to be 1-518-343-81.
SONY	TCFX4	Capstan and bearing not matched	This unit exhibited excessive wow/flutter at the beginning ofthe tape only. we found that the capstan and pinch roller were not matedcorrectly. changing flywheel and capstan bearing improved the situation.however we found it necessary to put a shim und
SONY	TAP7F	Defective ic101/102	This unit was locked in the tape position.
SONY	TAF6B	Defective attenuator assembly	This unit had intermittent noise (popping) in the left channelonly with signal applied. we found the attenuator assy (volume control)making poor connection. this was an odd problem because it did not appearto be a problem with the control assy. it onl
SONY	TAF55	All lamps open if one opens	All lamps are open. apparently when one of the lamps failsthe others also go when a peak is received.
SONY	STRV45	Poor grounding	A lot of these units were coming in for intermittent shut-down. a very common cause was poor grounding (see diagram). the bestway of checking this was to use a digital meter on the 2v range. if thereis a problem the meter usually head 0.62v or more.
SONY	PSX70	Open transistor	When unit starts cueing works. after that, the manualcueing does not work. there was a pulse at the base of q133 andcollector of q134 after that there were no pulses.
SONY	PSFL1	Worn gears	When the drawer was opened or closed, erratic and noisyoperation was noted.
SONY	HMK3000	Re-alignment of capstan gear	Tape would jam intermittently. by moving the capstan gear,unit would work.
SONY	CF450	Substitution of power transformer	The above power transformer is now substituted by1-442-513-xx with a few extra leads and no installation instructions. -hq comments: the power transformer you have is for general export.the original transformer is 1-441-762-xx. this has been substitute
SONY	XR77	Defective relay	Left channel cuts in and out during tape.
SONY	XM120	Oversized capacitors	C607, 608, 609 are all one inch tall in original unit. partssent from kc are 1 1/2 inch tall which presents a problem in installationin pps board because of height. -hq comments: we have printed a tech. newsletter giving the part numbersfor these small
SONY	TCK71	Capstan base assy	This unit ocassionally skews. we found that the left pin onthe capstan base assy was loose.
SONY	TCK65	Capstan motor	We found the capstan motor siezed as a result of the rearbearing coming loose. this locked position caused the motor drives tooverheat and short which in turn burnt the board.
SONY	TCFX1010	Error in manual	The system control schematic on page 49 shows the +5 volt lineand the -11.7 volt line connected together at the positive side of c773.the fly speck where the lines cross should not be there. -hq comments: when we need a s/b on this model for something e
SONY	TCFX500R	Gear wears	Unit makes grinding noise when reversing. intermittently willjam at same time noise is heard. gear is made of soft plastic. inreverse mode torque is too great and teeth pre-destroyed.
SONY	TCFX44	Burr on cam	No fast forward.
SONY	TCFX33	Error in manual	Several mistakes were found in the tc-fx33 preliminary s/mduring trouble-shooting use. i did not have time to check all connectionsand components but have listed the mistakes i did find obvious.