TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TC207	Part number missing - head deck assy	Need part number for head deck assy, as shown on page 17 ofservice manual. -hq comments: please order a replacement assembly by p/n a-3164-130-a.will issue a s/b.
SONY	CDP302	Intermittent operation - bad soldering c905	Intermittent operation. when not operating correctly, the+10.8 volt line is 8.2 volts. all other supplies are normal.
SONY	STRVX550	Schematic discrepancy	Auto stop circuit in unit is different from schematic. -hq comments: there is a difference as you pointed out. the diode1s1555 is a recent addition and there are units that do not have it. ifthere is no diode, add it in. the diode ensures that protec
SONY	CCDV8	Unit shuts off intermittently	Sometimes a battery would last 30 min and the unit would shutoff. sometimes the unit would not come on right away. the customer wouldhave to press the power button several times for it to work.
SONY	STRAV460	Premature shutdown	Normal operation at low volume, protection operates at 20dblevel. memory disappears. c801 leaked electrolyte onto pcb.
SONY	KV2665	Sound mute intermittently, "m" board ic-001	The unit would intermittently mute the sound. proper opera-tion could be restored by pushing the enter button.
SONY	XR33	Service manuals - car stereo	The s/m for the new car stereo are still not in kc. the dis-tributor has some product being returned for service. the manuals thatthey need are: xr-33/33a/44/66/80/740/780/900 and xm-300/700/120 supp. -hq comments: due to heavy work load, the npc must
SONY	CDXR7	Disc will not load	The disc will not load. the chucking arm gets below its guidepin blocking disccdx-5.
SONY	KV1957R	No remote or manual operation, solder blob removed	Set would turn on immediately when plugged into ac. no func-tion buttons would operate and the set could not be turned off unless itwas unplugged.
SONY	SLHF300	No play operation	Unit would load tape, but no power lamp and when play buttonwas pushed, no tape movement. drum motor would not turn and neither wouldthe capstan motor, found cold solder joint on cn3/ps-39 board, terminalno. 4. this is the 9v supply line.
SONY	CFSV2	Tape transport replacement as per s/b #125	The cfs-v2 tape transport i received from kc was incompatiblewith the original chassis. s/b #125 listed p/n x-3570-050-4 as thereplacement. the new brake levers switch arm is too short to actuate thepower switch (s304). also a portion of the brake lev
SONY	SL2000	P/n for sl-5146 capstan perpendicularity jig	The instructions provided with p/n a-6759-172-a chassis assymechanical note that an alignment jig is necessary for proper adjustmentof capstan shaft perpendicularity. what is p/n for jig (sl-5146)? -hq comments: the p/n for the sl-5146 capstan shaft pe
SONY	SLHF600	No part #	No function with remote. this ic seems to be the problem.please call with part #. see page 112, area g-20 on fu-38 board. no part# in 1985 semiconductor handbook. -hq comments: the part number (8-741-131-70) for ic bx1317 is given onpage 150 in the s
SONY	CFS7000	Model #	Service bulletin #146 tape recorder should be revised toinclude all model numbers using this gear (head rotation gear). -hq comments: we will add the model numbers in the bulletin. the gearyou are mentioning is used in cfs-7000/9000/f11. the gearbeen
SONY	WMD6C	Intermittent motor drive	Motor would stop intermittently. flexing main board wouldoccasionally cause problem, but problem was not reliably controllable.
SONY	VTX1100R	Sound faded out	Sound faded out while listening to the problem. tv audiowas weak and had excessive treble, line audio checked ok. signal aroundic205 pin 25 was good, pin 23 good, pin 27 good, pin 26 bad. bypassedcap with tweezers and audio level came up to normal.
SONY	SL2710	Video head replacement	Repetitive head clogging.
SONY	WM7	Unit dead - no operation	A technician replaced the system control circuit but the unitis still dead. noticed the switch (s807) was in ff position. put theswitch back to the stop position and applied power to the unit. theswitch went to ff position again.
SONY	WM7	The pb head does not stay in pb position	In pb mode, the pb head goes up and down three times and goes back to stop position.
SONY	WMD6	Audio very low	The audio is very low even with maximum volume. when themuting circuit unit is disengaged, the audio level is normal.