TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	CDP101	Open r390	Disc drawer would not open/no led indication on open/closebutton. disc indication on display would blink normally. found r390(4.7Ω) in +13v line burned open. i could not find any short or lowresistance on this line. the original resistor was 1/2
SONY	CDP101	Defective sled motor	Intermittent - would not always read toc sometimes read tocbut would not play (ejecting disc instead) other time worked properly.problem first seemed to be mechanically related since a light tap on theback would usually result in start of normal function
SONY	CDP101	Out of adjustment	Skipping, jumps tracks.
SONY	WM7	Dirty headphone jack	Remote function of unit while using head phones (mdr-w5) wasnot functioning in the fwd and reverse mode. however unit was functionmanually in all modes.
SONY	TCPB10	Ornamental plate needed repositioning	Unit would operate fine but when the stop button was depressedthe unit would stop and start again.
SONY	TCK555	Dirty pinch roller	This unit exhibited excessive wow and flutter. inspection ofthe pinch roller revealed little spots of what looked to be locktight.this same problem has been found on two other units.
SONY	TCK71	Open solenoid	The head on this unit would not pull up into the playposition. we found the solenoid to be open.
SONY	TCK5	Missing retainer clip	This unit displayed a periodic warble in the sound. a checkwith a torque cassette revealed the back tension to be erratic. we foundthe lever situated underneath the reel table to have come loose. this inturn was periodically rubbing on the reel table.
SONY	TCFX1010	Cold solder joint	Intermittently, unit would power up with wrong indications,for example, all tape type indicators would light up. also, power wouldsometimes go out completely 7-8 secs after turn on. this unit waspurchased by employee from refurb.
SONY	TCFX500R	Open grounds	Control functions (play, rec etc) are inoperative totally orintermittently, may stop operating during use or prevent use of functionswhen attempting to enter a particular mode of operation.
SONY	TCFX500R	Chassis head assy bent	When put in reverse it only cycles and you cannot remove tapeuntil ff is depressed because the head assy does not drop down completely.
SONY	TCFX500R	Worn gear assembly	Clattering in transport, especially when changing directionwas the complaint. upon my investigation i learned that the noise onlyoccurred when direction of play was changed.
SONY	TCFX500R	Stripped gears	Driving and forward cam gears stripped. head chassis appearsto be free and operation not excessively stiff when moved by hand but thedealer has only sold 3 units so i have not enough to see if it is a trendof failures.
SONY	TCFX44	Capstan shaft had to be tilted	A few seconds after engaging play mode, the tape would skewtoward the chassis and wrinkle. on two of these units, this would occurintermittently.
SONY	TCFX33	Levers out of position	In playback or fast forward, there was no tape motion andthere was the sound of gears clattering. the reverse select lever and thebushing select lever were both out of position. it appeared as if someonehad previously worked on this unit.
SONY	TCFX30	Aged resistor	Unit would slow down in rewind and fast forward modes whendolby c was turned on.
SONY	TCFX22	Idler wheel binding	Playback was very slow.
SONY	TCFX22	Bend in slider needed	Transport fails to have take-up in playback or record mode.transport is excessively noisy and will not engage into ff smoothly.all of this can be caused by slider (355) being bent causing ff lever(305) to have incorrect timing in conjunction with take-up
SONY	TCFX5	Defective regulator q602	This unit had intermittent bias osc. operation caused by theline mute (pin 21 ic501) being intermittently activated. we found thiserratic operation of the upc to be caused by a noisy voltage regulator- q602. a quick check of the b+ line revealed the pr
SONY	STR55	Defective ic101	Tuner section drifts off station intermittently.