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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYCDP302
Intermittent playIntermittent play, skips forward, backward, etc.
SONYTTS81
Missing part number for motor pulleyWe need the p/n for motor pulley on tts-81. see page 23 ofthe manual. -hq comments: the motor pulley is a part of the motor assy (dne-3002a).the part number is a-4608-151-a.
SONYKV5000
Video detector assembly part numberVideo detector diode (d201) is enclosed in a can with r270and c225. servicer claims that he cannot disassemble the can and wantsto know if part number for the assembly is available. -hq comments: there should be no problem with disassembling the can an
SONYWMF8
Part number for new style motorOld version wm-f8 (as in service manual) uses separate servoamp and motor. new version uses a motor with servo amp mounted on it.the old motor is type dnr6900a, p/n 8-835-105-01. new motor assembly istype dnr5700a. we need the correct p/n for this mot
SONYCFS580
Missing part number for lever, panel buttonWe need the part number for lever, panel button on page 33 ofthe manual. -hq comments: sorry, the part is no longer available.
SONYKV25XBR
Distorted right channel audio, replaced ic1108Distorted audio, right channel only.
SONYCDP302
MistrackingMistracks towards end of disc. in addition to alignment,q203 was found to be leaky. also, helpful to repeat tracking alignmentwith number of discs to find medium. -hq comments: when the tracking gain adj. is realigned to several discs,please make sure
SONYWMD6C
Irregular speedSet starts with slightly higher speed than normal. after 3-5minutes, speed changes up and down every 1-2 records. the set came backafter about one week, motor will not stop, and speed was about four timesfaster.
SONYD5A
No disc rotationScrew was broken and the screw head stopped the disc motor.
SONYPSX45
Intermittent motor movementIntermittently motor would go and stop.
SONYKV1357R
Signal drift on channels 4 and 5 only, solder splash q101After set was on about 4 to 5 hours, the signal would drifton channels 4 and 5 only, ie, severely mis-tuned. i noticed a soldersplash between gate and power supply leads of q-101. when the short wasremoved, we lost channels 4 and 5 completely. all other sta
SONYFD40A
Raster distortion when moved within any magnetic fieldWhen unit is moved, distortion occurs in raster, ie, bottom ofthe screen will bend causing distortion in scan lines and the raster willexpand and contract causing a change in size. -hq comments: the symptom you are describing is common to all crts. iti
SONYKV2670R
Different ic301, see s/b ctv0236 and tvp0025Ic301 in actual set is not the same as in the service manual.manual and schematic say ic301 is a cx-20129. same units actually use acx-20193. these parts are not interchangeable. p/n for cx-20129 is 8-752-012-91 p/n for cx-20193 is
SONYCDP302
No displayMachine functioned normally with the exception of having nodisplay. checked filament voltage and inputs and outputs to displaydrive chip and found no problems.
SONYKV25XBR
DeadUnit was dead. no functions. traced problem to shortedd1657 (pin damper diode).
SONYKV25XBR
No soundNo audio output. traced problem to ic1107 on the x board.this is the second report i know of this problem.
SONYBMC110
Distorted playback pictureRecording played back showed distorted picture only filling1/5 of the left side of screen. a white spot was in the center when theiris was opened up.
SONYSL5000
CanSometimes ejects tape when play is pushed. ant sel in wouldchange logic when button pushed but that the output stayed high. changingmicroprocessor produced no change. pins 30, 31 and 29 all were high.unsoldering these pins allowed the program select t
SONYSTRV55
No tuner or memoryNo tuner output or memory functions. tuning voltage to tunerremained at 30v regardless of frequency indication on display.external dc on tuning line resulted in good reception. dc on ic402were wrong for pins 2, 3, 8 and 14, 15. replacing ic401, ic402,
SONYSL2400
Spurious threading at turn onUnit would attempt to thread tape immediately at turn on,even without a tape inserted or loaded. problem was intermittent.