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Make	Model	Symptom	Problem
SONY	TCFX44	Defective ry301	This 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.
SONY	TAAX500	Fractured ground lug	With the volume control set at minimum there is an imbalancein the sound level and static in one or both channels.
SONY	STRVX550	Missing part number in manual	No part number for fm tuner in s/m. fm tuner number isa-434-402-9a.
SONY	STP75	Defective control upc - ic603	This unit did not light any display segments and there wasno tuning. a check of - control upc - ic603 revealed that the ic wasinoperative.
SONY	RS30	Short on secondary of t901	No power. spring connector was bent towards pc board,shorting to ground the secondary of t-901 (power trans).
SONY	PSLX500	Audible noise	Low level thump or rumble like noise is heard when everhorizontal drive motor moves tonearm.
SONY	PSF5	Instructions in manual	Page 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
SONY	PCMF1	Defective ic531	Sound 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.
SONY	MTL10B	Defective q511	All 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.
SONY	M205A	Defective panasonic cassettes	I 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.
SONY	ICF2001	Defective ic201	The 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.
SONY	ICF2001	Defective filters q32/q51	The fm muted above 89.20mc. am worked fine we found the pwmnot being properly filtered out of pll-1.
SONY	CFS99	Substitute part was smaller	Substitute 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.
SONY	CFS45	Replacement part is smaller	Replaced 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.
SONY	CDP701ES	Dead unit	The 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.
SONY	CDP101	Fusible resistors r390 and r391	Door opens slow. r390 and r391 was charred and ic304 wasreplaced as precaution.
SONY	CDP101	Defective crystal	1) 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.
SONY	XR85	Loading drive belt stretches	Loading drive belt stretches and belt will slip. when thebelt slips the cassette will not load.
SONY	XR85	Incorrect part number in manual	A 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.
SONY	WM10	Cold solder joint on flexible board	Unit 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.