TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	WM10	Screw becomes loose	Screw on control plate block assy comes loose, touchingbottom side of flywheel.
SONY	WM10	Gear needs bending	This unit had no take-up. gear #364 was not low enough toengage gear #368.
SONY	WM7	Missing part number	The part number for the key switch board is not listed in the s/m.
SONY	WM7	Replacement part needs modification	Membrane circuit board requires modifying from form in whichit is received for proper installation and working in machine (cutting ofmembrane). -hq comments: the circular foil path in the upper most right corner ofmembrane needs to be cut.
SONY	TCK777	Defective r/p head	With music, poor low freq. response with audio sweep gen.,beat freq. from low end of response up to about 2khz only if sweep washigher than 12khz on the high end.
SONY	TCFX44	Defective c505	With the cassette door open and power applied, this deckwould go into play mode, although the play led was not lighted.
SONY	TCFX30	Belt slipping	The customer complained that he intermittently could notopen the cassette door. this was due to the head assembly not completelydisengaging. we found that the belt would occasionally slip on thecapstan during the disengagement process. the belt appear
SONY	TCFX25	Improper operation with tape	When using basf professional ii, c-90 cassettes, the tapewould skew upwards just past the leader splice, ruining the tape. thecustomer claimed all other brands worked fine, including the newlydesigned basf professional ii.
SONY	STRVX750	Ic301 needed reset	Original complaint was that switched ac outlet on rear panel could not be turned off.
SONY	STRVX550	Ground loop problem	Intermittently set would shut off all displays, or would losepreset stations, or sound would be muted until any one button was touched. -hq comments: ground loops can be difficult to isolate. we would haveprobably done the same using braid wire (solder
SONY	STRVX550	Missing c654	One channel appeared to be louder than the other. looking atchannels on the scope showed left channel boost in treble when basscontrol was increased. found that c654 was not installed at the factory.
SONY	STRVX4	Defective c803	The customer complained of low volume and distortion. wetraced the problem to low b+, we found c803/c804 to have changed in valueand leaking the paste out into the chassis.
SONY	STJX44	Open resistor in pack	Unit came into shop with the complaint of no memory.checked unit, found that it would not remember channel settings.
SONY	PSFL77	Defective switch	All functions were inoperative. we found pin 26/ic201(sys con) to be high with the tonearm in the rest position. the metalfingers on the tonearm position switch were bent and not making contact.a simple way to confirm a problem with the position switch
SONY	CFS500	Transport jams	The unit's tape transport jams in the attempt to record forno apparent reason. button lock plate bar #352 is bent at the recordlever #344. -hq comments: i suspect abnormal customer force applied to the recordbutton while pressing another button at the
SONY	CDP101	Break in foil	Although the unit played discs, there was no sound, no counterdisplay. gfs was high and the eye pattern was good. but there was nodata at pin 17 of ic503 (cx7934).
SONY	XR85	Loading gear	Loading gear in unit is not being pushed back to mesh withdrive gear, therefore, the tape is not dropping. when pushed manually,the gear meshes and initiates the loading sequence. -hq comments: replacing the cassette loading gear spring (#335) shouldpe
SONY	XR70	Pinch roller shaft	Pinch roller shaft loosening from chassis assy causing to eattapes and have speed changes.
SONY	XR70	Defective q804	Tape will not load (drop) properly every time it's loaded.lever assy in question cocks the drop mechanism when it catches onthreading arm shaft (p/n 3-573-870-0). -hq comments: when the cassette springs back out a little after beingloaded into the carri
SONY	WM5	Leaky q101	One channel dead on cassette, radio works fine.