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SONY Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYTCD5M
Defective q-901Fast forward and rewind are stopped after running a fewseconds.
SONYSRF80W
Leads of c606 needed insulationIntermittent speaker popping on left channel. problem wouldnot arise when using headphones but only when radio installed in poweredspeaker unit.
SONYPSX40
Shorted motorVery low drive torque, q103 and q104 low outputs. no signalat emitter of q103 and q104 - measure emitter of q103 and q104 to groundreading should be 38Ω. l3 and l4 of motor measure short.
SONYPST22
Motor hum at start-upAt start up of motor for about 1/2 revolution of platter thereis a hum, then a pause, as soon as the motor is up to speed hum stops.
SONYICFC310W
Modification to increase buzzer outputCustomer is complaining the buzzer is not loud enough.buzzer becomes loud enough when the sleep switch is on. at that timeq6 collector receives 12v for a louder amplification than the 6 volts itsees when the buzzer is on by itself. what can be done to
SONYICFC15W
Disconnected q9Distorted sound in audio section. used signal tracer to findbreak in landing at the collector of q9.
SONYICF7600
Loose capacitorCapacitor had pulled away on the tone control board.
SONYHMK414
Eject button out of proper locationWhen unboxed, eject button pushed inside of unit. no damageto box.
SONYHMK414
Motor fell out of proper locationCassette motor fell out of tape transport during shipment.
SONYCFS55
Stop lever not properly positionedNo audio when placed in play, but tape is erase, recordnormal.
SONYCFS55
Belt slips offIf the unit comes in with belt off my s/s advises me that oneshould change the belt along with any repair or it will come back as are-repair in a short time. -hq comments: replace the motor pulley when the capstan belt slippedoff the motor pulley in the
SONYCFS45
Pcb mounting screw breaks foil traceCircuit board mounting screw is tightened too much. cracksbreak b+ path to function switch.
SONYTPSL2
Defective motorUnit runs slow.
SONYTCM121
Mechanical modificationWhen customer presses record button with no tape inserted,pressure of record lever assy. against chassis causes the lever retainingportion to break off. since the retainer is part of the chassis assembly,the entire assy would have to be replaced.
SONYTCK55II
Defective remote chipUnit functions jammed in rewind mode voltages on pin 33 was0.37 volts. rewind mode voltage should read 10 volts. voltages ofremote chip pins 9, 5, 11 and 7 were 1.9v also should be 10 volts.remote chip affected total operation of tape deck.
SONYTC755
Cleaning stop microswitchLow playback level off tape, power supply position ok. recordsection checked ok, found playback amp was being muted by q304 and q404.base measure 1.6v all the time. lifted r437, playback level normal.traced 1.6v back into system control ckt., to emitter of q
SONYTAF3A
Pcb labelling incorrectQ103/104/153/154 - 3 and 4 reversed on pcb labelling. -hq comments: thank you for this information.
SONYPT79R
Part number errorI had ordered a power transformer, p/n 1-446-639-00, for usamodel which i copied the number directly out from the service manual. thetransformer that was sent to me was coded with the same number as was themanual but instead it was of 220 volts. later
SONYSTRV25
Error in manualPage 7 procedure 2, error adjust rt101 for 76 khz +/- 100 hz.this is opposite str-v2/-v3/-v4.
SONYSTRV25
Modification on mounting flame proof resistorsQ652 failed causing flame proof resistors r633, 664, 665 tooverheat and open. this type resistor gets very hot before opening sincethese are mounted tight against the board. damage will occur when theyget hot.