TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	XR550R	Tape has no take-up	The clutch assembly is a press fit, spring loaded plate thatcracks and comes apart. as a result, there is no take-up torque.although the clutch can be repaired, it takes approximately one hour. -soluyion: replaced clutch assembly. -hq comments: thanks
SONY	KV10FMR20	No picture	Y signal not passing through q-302. q-304 is on, should beoff. d-301 and d-303 reverse - biased.
SONY	FD35A	Reg/drive, replaced ic601 and q602	Unit is dead. we found ic-601 to be dead. in addition,q-602 had a b-c short. we suspect that q-602 was the cause of ic-601'sfailure. replacement resolved the problem. -hq comments: in addition to q-602 replacement, rc protective circuitcan be added
SONY	SL2406	Intermittent drum speed	Intermittent drum speed caused by aged yellow glue on the pgsensor located on the drum stator. after glue has aged, it starts to actas a conductor.
SONY	STRAV310	Unit shuts off when volume change with remote	Unit would shut off when volume was changed up or down withremote. when remote was released, unit would immediately power back up.
SONY	KV32XBR10	Voltage discrepancies in service manual ic-651, correction 1	Discrepancies have been found between service manual and theset as follows: on page 1, ic-651 in service manual: 128v, in set: 75v* service manual shows q-305, d-309, and - 7v regulator circuit - but itis not actually in set. -hq comments: kv-32xbr10,
SONY	EVS700U	Wrinkles tapes - tracking off	Lines in picture look like the tracking may also wrinkle oreat tape.
SONY	CDXR79	Will not play or disc skips or sticks	Unit came in with complaint of after accepting disc, it willnot play or disc skips or sticks after unit plays for a while. anothersymptom is the md base will work upside down and all adjustments look ok.
SONY	CCDV101	Mechanical noise when threading or unthreading	Metallic rattling noise during eject or threading modes.
SONY	CCDF35	No camera video signal	Ic-802 pin 31 had 0 voltage and would not open switchesq-810 and q-809 to get clk, and data to ic-804 (evr ic). all outputs ofic were 0 volts. iris was not opening.
SONY	SSTL5	No output	No output from speaker.
SONY	CFD64	Intermittent audio in tape mode	Intermittent audio in tape mode. too much pressure on functionselector switch in tape mode, due to the position of the audio pcb, wascausing intermittent loss of audio, this because switch failed to close.
SONY	CDP350	Incorrect waveforms and frequency	Ic-3, cxd1130q, pins 76 and 80 have incorrect timing for pin80 and incorrect timing and waveshape for pin 76. -hq comments: thanks for the info. the correct waveforms are in the d3service manual, which utilizes the same chip.
SONY	STRAV900	No power control	Unit had previously been worked on for power surge. three ics(ic-404, control computer/ic-301, display control/ic-302-geq, displaycontrol) had been changed for no turn on. checking the must havesrevealed +5vdc ok but the osc. signal stop signals were i
SONY	STRAV900	Service manual correction	Service manual schematic and pcb layout diagrams are quitedifferent from the pcb in this unit (especially in the systems controlarea).
SONY	CDX6020	No operation	Transistor q-409 shorts, damaging the board.
SONY	CCDF70	Part number for (fp-134) flex board	Need part number for fp-134 flex board. it is the flexboard that goes between ss-93 board and ja-42 board. -hq comments: the part number is 162622911
SONY	SPP90	No operation	No operation. unit had power.
SONY	CFD454	Intermittent shutdown of cassette player	Erratic operation of cassette player. there are two commoncauses for this. one is that the shutoff lever loses its spring tension.the second is that the belt (ref #255) stretches.
SONY	KV27HFR	No color, replace c-508	Pin 12 of ic-301 was about 1 volt dc, waveform was ok. thehorizontal pulse at this pin is also used for burst flag inside this ic.c-508, connected to pin 12 of ic-301 was leaky.