Sony Repair Tips

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Make	Model	Symptom	Problem
SONY	CFM31	Shorted connection	The only function that did not work was am.
SONY	TFM7720W	Break in pcb	Sound is unclear.
SONY	TFM6060W	Cold solder connection on t7	No fm.
SONY	ICFC410W	Incorrect substitute transistors used	When radio is turned on either no sound or a buzzing sound isheard. i have found that q5, q6 and q11, which call for 2sc1363 tran-sistors have been replaced with 2sc1634 transistors which are notsubstitutes.
SONY	ICF9650	Broken pcb	Circuit board cracked at 3 out of 4 mounting posts. novisable damage on cabinet or packing material. problem previouslyreported on icf-9650 #159305. found identical problem on icf-9650#156863, and #196273. -hq comments: we will investigate this probl
SONY	TCM121	Bracket assy out of location	This unit would eat tape because take up reel would not turn.the bracket assy was allowed to travel backwards (pulling against thespring) until it went past the plastic guide on the chassis assy. onceit went past the guide, it could not come back forwar
SONY	TCK96R	Idler wheel	At end of tape unit will not auto reverse or shutoff. in thisunit the micro processor gets it's signal off the reel motor. at the endof the tape when take up reel was stopped at tend of tape the reel motorwas still dragging sending the pulse signals to
SONY	TCK96R	Part replacement needed	Auto shutoff and bi-directional playback is intermittent.
SONY	TCK35	Rough spot on fr limiter	In fwd or rew, when unit gets to end of tape, r1008 will gethot and twice r1008 opened for customer. found flywheel to be almoststopping drawing around 180ma.
SONY	TCK15	Modification needed	This deck produces short duration pops and snaps while playingtdk tape. (same tape works ok in other sony recorders.) -hq comments: please refer the attached s/b issued in sony canada and dothe same disposition. we will issue the s/b.
SONY	TCK1A	Defective capacitors	Complaint was no pb both channels, rec vol. ok. first stageof eq amp was cut off, second stage saturated.
SONY	HMK229	Main board not grounded	With the exception of a click in both speakers when unit isengaged, dial lamps and cassette motor running, the unit is dead.
SONY	TCM121	Bracket needs bending	No take-up in fwd play mode. the latch on the idler bracketsometimes doesn't go over the stub on the chassis but goes to the sideof it and jams there.
SONY	TC630	Too much load on motor from mechanism	Servicer reports that replacement motors for tc-630 andtc-105 recorders do not have as much torque as original motor. -hq comments: we installed the motor which you sent for evaluation intotc-630d. the tape speed of the tape deck was originally +0.6t i
SONY	TAF30	Hum in headphone	When tape monitor or any input switch is engaged, a hum isnoticed in the headphone output. problem occurs due to current flowingthrough common ground connections from pilot lamps.
SONY	STRV55	Cold solder connection	Protection circuit relay, ry701 would actuate intermittentlywhen volume was turned up from about 3 click-stop positions to the 9o'clock position.
SONY	TCM121	Defective ic's 4140, upb4011	No playback and no record.
SONY	TCK1A	Drive belt gets stuck	Several units came in with no movement at all. in all casesthe drive belt was stuck between the motor pulley and motor.
SONY	STRV4	Different transistor used	Transistor 2sd666a is used in the unit. however, the partsdescription has it listed as 2sc1811. a further check with the transistorsubstitution book did not verify that one is a substitute of the other.
SONY	ICFC21W	Fragile connector	The connector used to wire the main board to the functionboard is too short and fragile. during repairing, any pressure appliedcan cause it to short or keep the radio on. it is also difficult tostrip and solder.