TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	HST49	Incorrect p/n	Service manual shows p/n 1-548-091-xx for tape counter, thiscounter will not mount in unit.
SONY	HST48	Defective ic ha1350s	Unit turns on but no sound from speaker a or b channel. ifnew speakers are plugged in they will blow because of 28 volts comingthrough defective ha1350s output ic. this also pertains to the hst-68 andhst-69.
SONY	HMK339	Missing part number	Part designated as spring plate on exploded view page 32 ofs/m has no part number. -hq comments: the part number is 3-554-215-00.
SONY	HMK339	Defective rubber on reel assembly	The take up reel does not take up the tape properly. tapeballs up between capstan and take up reel, and get damaged. this iscaused by lack of pressure between drive pulley and take up reel rubbersurface.
SONY	HME228	Wrong value cap installed	No separation in stereo. all voltages looked ok - factoryerror.
SONY	HP219A	Boards have changed	Manual lists the part number as k-006-048-10, part beingreceived is k-0660-481-0. -hq comments: the servo amplifier and dc motor set has been changed andthe former set is no longer available. the part number of the set(k-066-048-10) remains the same.
SONY	CFSD7	Lever needed bending	Solenoids would click but tape mechanism would not move.lever a would rise over cam gear a causing the mechanism not to bepushed down into gear.
SONY	CFSD7	Link lever binding	Cannot place tape deck in any mode. forward led on all the time.
SONY	CFS55	Defective r308 and switch	B+ section of switch malfunctions either on tape or radio orboth at same time, also affects battery operation. r308 was also open.
SONY	CFS55	Defective lock plate	Buttons jammed up, lock plate too soft.
SONY	CFS45	Belt comes off	Tape would not move in any direction. found belt off motorpulley.
SONY	CFM31	Bridge on pcb	The only function that did not work was am.
SONY	CFM31	Lever breaks	Customer forces record lever down, forcing lever (a) againstlever (b) which breaks or shears lever (a) pivoting stud which is a partof sub-chassis. also this forces ff lever up breaking its guide postwhich is also a part of sub-chassis.
SONY	CF550	Incorrect sub-motor supplied	Original motor (8-834-009-01) requires 3 mounting holes whilesub-motor 8-834-009-10 needs 2. -hq comments: correct sub-motor number is x-354-931-41.
SONY	CF520	Motor will not run	R401 opens. motor will not run.
SONY	ALL AUD	Substitute transistor is incorrect	The substitute transistor for 2sd667, listed as 2sa768 onfisch card and in the computer is wrong. -hq comments: the only substitute is 2sd667a. this has been correctedin the 1988 substitution book.
SONY	ALL TVP	Replacement heads come without mounting screws	Replacement heads come without mounting screws.
SONY	ALL TVP	Servicing is dangerous	The entire inverter power supply is directly connected to theac line. when troubleshooting the power supply circuits, an isolationtransformer must be used.
SONY	TCK96R	Drive slider tab needed to be bent	Door was jammed. cass. transport locked up in play mode,consequently eject mode would not work. found 2 roller pins (p/n 3-558-448-00) had become misaligned.
SONY	STRV55	Defective capacitor	Interstation noise on am and fm. receiver will not scan orselect stations via memory presets. all segments of display tube lit up.