Sony TV Repair: Common Faults and Solutions.


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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYPSF5
Instructions in manualPage 17 of service manual, in order to perform verticalbalance and horizontal balance we recommend using a 70mg, a 245mg anda 315mg weight. servicer has asked if we have a p/n for these weights. -hq comments: use the following number of washers to get
SONYPCMF1
Defective ic531Sound breaks up (muting) on e to e and on playback ofprerecorded tape. found vco drifting. found no dc change at output ofic531 pin 1 although input to pin 3 was changing.
SONYMTL10B
Defective q511All functions inoperative. unit had been worked on by dealerand microprocessor had been changed (ic502). found that there were nokey scan pulses to pins 30/31/32 and ic502.
SONYM205A
Defective panasonic cassettesI have had several instances of erratic or non-operation ofm205a at the pittsburgh fsc counter. in all of these, the customer wasusing panasonic mc60 cassettes. replacement with sony mc60 cassettescured all problems to satisfaction of customer.
SONYICF2001
Defective ic201The am was very weak and only strong stations could bleedthrough. we found the problem to be caused by incorrect bandswitching.we found ic201 to be putting out the wrong commands.
SONYICF2001
Defective filters q32/q51The fm muted above 89.20mc. am worked fine we found the pwmnot being properly filtered out of pll-1.
SONYCFS99
Substitute part was smallerSubstitute part was smaller. -hq comments: late production cfs-99s used a larger gear (an) identifiedby p/n 3-579-641-00. please make a note in your s/m.
SONYCFS45
Replacement part is smallerReplaced tape transport with x-3570-050-1. found motor switchnot being activated due to arm on brake lever being too short to reachswitch. transport p/n x-3570-050-4 has correct length arm.
SONYCDP701ES
Dead unitThe dead unit had ic108, ic109, ic110, ic801 - shorted.ic108 was physically melted, with a hole in the chip. we can duplicatethe problem by shooting c218, c214, c138 to ground for a fraction ofa second.
SONYCDP101
Fusible resistors r390 and r391Door opens slow. r390 and r391 was charred and ic304 wasreplaced as precaution.
SONYCDP101
Defective crystal1) disc motor would run at power on. 2) no loading orchucking operation. 3) sometimes pause and play, leds would light.4) sometimes drawer would open partly.
SONYXR85
Loading drive belt stretchesLoading drive belt stretches and belt will slip. when thebelt slips the cassette will not load.
SONYXR85
Incorrect part number in manualA tech. ordered a volume control (r/n 502 in the s/m) by theparts number 1-228-735-00 but he received the part 503, instead.
SONYWM10
Cold solder joint on flexible boardUnit stopped rewinding or fast forwarding several secondafter pressing rew or ff button. found cold solder on the flexible boardbetween s901 and r634 as indicated in the diagram.
SONYTCK88B
Unit out of adjustmentDealer complained of gross wow and flutter. verified problem,measured 0.6% jis weighted.
SONYTCK88B
Loose wire between servo board and syscon boardCounter was intermittently not advancing. determined thatic602 derives count from supply reel revolutions using output of q536 andq535 on servo board.
SONYTCFX77
Missing part # in manualThere is no p/n for the capacitor c134, 234 (56pf/500v),which are connected to the r/p head, in the service manual.
SONYTCFX44
Defective relayErratic system control operation. when record button isdepressed, unit will intermittently enter rewind mode after 2-3 sec(record deactivates). results from high resistance of relay contacts.
SONYSPP11
Service manual instructionsP31. lacking a linear detector, i adjust rv2 to energizebase relay.
SONYSPP11
Service manual instructionsP10 of service manual instructs tech. to turn rv6 ccw forfreq. adjustment. it is my belief that it should read rv5, instead.