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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Technics SU C2000
Expensive control amp/ preamp
Scratchy motorised/sevo volume control. Anyone been here before, any pifalls opening up etc ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#2
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Technics SU C2000
Not made to be taken apart. Long rivets and star circlip. Unusually ,
constant but fairly low level of crackle over 80 percent of one track. Presumably loss of plating on conductor track so varying different metal Seebeck voltage or chemical corrosion perhaps . -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#3
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Technics SU C2000
With this sort of problem cannot see resistance amisss by checking with a
DVM. Worn track but only worn down, not through. 3 sets of wipers per pot and 3 circular paths, conductor, 100 K resistor and low resistance inner ring of about 20 ohms around. Probably problem due to corrossion over most of the wiper fingers and this central contact ring. The pitfall is a not noticed/seen, presumably cartouche shape widget, that locates that shape hole in the pot paxolin to the smaller same shape of axis shaft. I must have removed both together thinking they were one part and lost the widget before placing in tray or sticking to something else and losing. Had to fashion one from a couple of transistor insulated washers and epoxy. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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