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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYAC910
Wrong transistor in the service manualOriginal part removed is 2sa1217. in the service manual thetransistor 2sb834 is used for q1 and q2. using this transistor is notgood because the leads are reversed compared to 2sa1217 (ecb 2sa1217,bce 2sb834).
SONYCCDV8AFU
No capstan lockIn playback unit showed white noise bar moving through pic-ture. checked all voltages at ic106, all good but pin 25 showed only0.7vdc and would not change. put scope on pins 11 and 12. pin 11 was ok.pin 12 showed only noise. fl108 open.
SONYD5
Random skippingUnit is randomly skipping. when adjusting tracking balancethe waveform is low, about 2.5vpp instead of 5vpp.
SONYEVC8U
No eject and shutdown during playback1) tape unthreads during eject mode, but will not unload.after unthreading eject led blinks. 2) during playback, unit stops afterabout 10 sec and eject led blinks.
SONYKV25DXR
Interference in pictureThis unit had an interference pattern in the picture, like aherring bone.
SONYKV25DXR
No rgb operation with pc-701Inside the pc701 pin 2 is shorted to pin 28 with a shortingwire. in the dxr pin 2 is 5 volts and pin 28 is ground.
SONYKX8200CD
No analog rgb, replaced ic108Digital rgb okay, no video on analog rgb. sync was low atq130 collector, found pin 1 of ic108 shorted to ground.
SONYCCDV8AFU
ShutdownUnit shuts down in about 10 seconds any mode. checkedvoltage at ph601, 602, 603. found voltage at ph603 pin 3 to be 1.3vdc.led side of ph603 open.
SONYCCDV8
Tape counter inoperativeTape counter inoperative, all modes. all other functions normal. check voltage at ph602 pin 3, found to be 1.3vdc. compared with ph601 and ph603 pin 3 showed 0.59vdc. led side of ph602 open.
SONYSLHF400
Co-channel interference on uhf ch. 21 from ch. 27Local uhf channels are ch. 21 and ch. 27. co-channel appearsworse while viewing lower channel from the higher channel
SONYKV25XBR
White vert. lines on cableGroup w cable of chicagoline on both sides of screen about 3/4 wide.
SONYCDP70
Intermittent operationSometimes unit works and can align completely but noticewhen door is open, display is out. measured +5v supply and would loaddown to almost 0vdc when door was open.
SONYKV1722
DeadStarter transistor, q604 would not turn off after start up,so r631 would overheat and burn out.
SONYSL20
PartsThe schematic page 83 calls for q501 to be a 2sc2785. theparts list page 112 calls for q501 to be a 2sc2458. q501 in the unit hasa different transistor marking 603e or f. what is this transistor? -hq comments: the correct p/n for q501 is 8-729-245-83
SONYKV2670R
Delayed tuning, jungle ic-301When switching channels, picture flickers and audio is mutedfor several seconds. aft voltage at pins 32, 33 of ic103 bounces untilpicture stabilizes. no horiz. sync pulse from pin 3 of ic301.
SONYWM10RV
Motor noise in headsetHarlan maurer at the minneapolis ssc reports that motor noisein one channel can be caused by a defective headphone jack.
SONYCFS66
Part number for roller (ref. #34)I need the part number for the bushing designated #34 onpage 30 of the service manual. -hq comments: part number for the roller (ref. #34) is 3-578-417-00.kcp has in stock. we will issue a service bulletin.
SONYTCK8
Missing p/n for lcd displayWe need the part number for the lcd display on this model.on page 43 of the service manual it lists a panel assy for the lcd (p/nx-3555-504-1) which is no longer available. is this the lcd or is thereanother number which i am not aware of? -hq comments
SONYD5
Disc motor does not rotateThe disc motor did not rotate although the inputs (clock,servo, b+, ground) were fine. we found the hall devices to be open.
SONYPCM701ES
No playbackThe unit would not play back. ic505 was not operating due tothe clock input on pin 12 being absent. we found the trouble in the vco.q524 had a b-e short and upset regulators q525 and q526.