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Make	Model	Symptom	Problem
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.
SONY	TFM7720W	Broken connection on antenna	No a.m.
SONY	TCK5	Disassembly instructions are missing	No disassembly instructions are given for removal of thebutton assembly.
SONY	TCK2A	Defective record switch	Intermittent high frequency oscillation. once started, the only way to stop it was to engage record mode and return to play. problem occurred only in play mode.
SONY	TCK1A	Error in s/m	P/n 8-834-021-xx for motor (d-02162) is listed in the s/m.however, a servicer found dnf-1001b motor, p/n 8-835-006-00, in the unit.which if either of these motors is correct for this model?
SONY	PSX30	Detection lever jammed	Scraping noise. cause is detection lever had been jammedunder protrusion on bottom of cam gear in shipping and was permanentlywarped. this was touching the top of the magnet ass'y on the motor shaft.
SONY	PSX30	Incorrect spacing of cam and gear	The gear (reject cam) will not engage. cause is the spacingbetween the cam and the gear on the motor shaft was excessive preventingthe clutch assy to be pushed far enough to engage the teeth. the spacebetween these gears was visibly greater than on oth
SONY	ICFC11W	L8 disconnected	No buzzer alarm.
SONY	CF520	R401 opens	R401 opens and the motor will not run.
SONY	TCM121	Belt jumps off motor	Belt jumps off motor pulley due to lubricant getting on belt.
SONY	TAE5450	Transformer radiating 60hz	Hum in both channels. volume control had very little effecton control of hum. if volume control turned up, tone controls wouldeffect hum.
SONY	STRV2	Blown transistors	Several units came in with blown power fuses.