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Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYWMF10
Motor noiseServicer has had several complaints of motor noise throughhead phones. this problem does not show up on wm-10 but only on wm-f10. -hq comments: electrical motor noise occurs when the b+ line is furthertaxed by: 1) loaded motor 2) decayed battery 3) l
SONYWMF1
Open rv-1When receiving stereo fm signals the sound was distorted.we found rv-1 to be open - vco adjust.
SONYWM10
Loose springSmall hair spring that sets in plastic groove of auto shutoff part of pinch roller comes out of groove and unit will not start toplay auto shut off taken over.
SONYTCK555
Defective ic202Unit would go into rec mode, however reel tables would notturn and it would eat tapes. found that b+ (10v) to board was low.isolated problem to shorted ic202.
SONYTCFX44
Defective ry301This unit would play back fine. however when recording therewere intermittent passages with motorboating. we found ry301 (whichswitches the head between pb and rec) to be defective. this caused a poorground connection on the head.
SONYTAAX500
Fractured ground lugWith the volume control set at minimum there is an imbalancein the sound level and static in one or both channels.
SONYSTRVX550
Missing part number in manualNo part number for fm tuner in s/m. fm tuner number isa-434-402-9a.
SONYSTP75
Defective control upc - ic603This unit did not light any display segments and there wasno tuning. a check of - control upc - ic603 revealed that the ic wasinoperative.
SONYRS30
Short on secondary of t901No power. spring connector was bent towards pc board,shorting to ground the secondary of t-901 (power trans).
SONYPSLX500
Audible noiseLow level thump or rumble like noise is heard when everhorizontal drive motor moves tonearm.
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.