TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	CDP101	Defective cx-79034	Static noise in both channels after 8 to 10 minutes. foundnoise being generated at output of cx-79034.
SONY	CDP101	Out of alignment	Rumble in audio. checked unit and found no problem. problemcould be in software or playback system. did complete alignment for unit,focus servo slightly out of range. returned to customer.
SONY	CDP101	Shorted wire	-10 volt line (from cn542 to cn536) was shorted to chassisnear bracket (bottom) to the rear of the sled assy.
SONY	XR77	Large distortion	Unit produced large distortion during tape operation withoutboard display no. 'dpl -el.
SONY	TCK81	High torque measured	After installing new take-up arm assembly, forward torquemeasures 55 to 65 q/cn. this may be contributing to tape skew problems,by requiring increased back tension.
SONY	TCFX33	Problems around ic501	Unit will not lock into play mode and the service manualschematic does not agree with its own board layout in the book andneither agree with the board in the unit. -hq comments: release from play could be initiated by reset pulseor slow oscillator (r-c
SONY	TCFX30	Grounding spring needed	Intermittent static noise was recorded when humidity levelsare low, erase and r/p heads were eliminated by grounding to chassis thisproblem occurs both on record and playback. -hq comments: 1) please apply grounding spring to erase head as outlinedin ta
SONY	TAN88	Open c410	The 78v line was reading about 110v on this unit and thesound was distorted. adjusting rt401 had little effect. we found c410to be open and causing the problem.
SONY	TAF55	Shorted d406	The 15v line was down on this unit. we found d406 shorted(located in regulator circuit).
SONY	STRVX6	Poor connections on q414	This unit had a dim display and erratic tuning q414 was found to be poorly soldered on the base and emitter leads.
SONY	PSX75	Arm needed adjustment	Cantilever of cartridge was being pulled to one side, bendingit eventually also mistracking in one channel, poor dynamic range, etc.
SONY	ICF2001	Error in pcb diagram	When rd amp fails, technician replaces q52 as labeled on pcb,diagram is incorrect.
SONY	CFS10	End of tape sensor not aligned	As tape moves in play mode - end of tape sensor is not alignedfully with width of tape causing uneven pressure and wrinkling of tape. -hq comments: the crease in the tape is indeed caused by excessivepressure as well as uneven placement of the pu lever
SONY	AUDIO GEN	T/n #8467	T/n #8467 list ic cx807-f1 and cx807-f3 as applicable to wm-2.however wm-2 uses cx808 on first and second type board an cx887 on thirdtype board. is cx807-f1 and cx807-f3 replacement for cx808 or cx887? -hq comments: cx-807 and cx-808 ics are identical
SONY	XR70	Tab adjustment needed	It will not accept tape. cause: eject lever (#387) fails toengage the pin on (#385) when tape is inserted.
SONY	XO5	Defective switch	This unit had a bad hum in the phono mode (unless the switchwas pushed in and held in hard). the small switch (muting) along side s2would not make contact unless switch was held in.
SONY	WMD6	Foil missing	No ff and rewind. motor started about 2-3 seconds after theplay switch is pressed.
SONY	TCM5	Missing parts in s/m	The mechanical layout on page 15 of the s/m is missing parts.
SONY	TCFX1010	Broken erase head wire	This unit had a distorted output at the p/b head(non-symetrical sine wave). this of course prevented the auto calibrationcircuit from functioning. we found a broken wire at the erase head to bethe problem.
SONY	TC530	Replacement motor is larger	Ic624-si motor substituted by p/n 8-832-627-00, type ic624hi. servicer states motor sub is physically larger and mounting holesare different. -hq comments: motors are direct replacement.ic624-si motor (8-832-624-09/02) = ic624-hi motor (8-832-627-00)