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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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JVC XP-A1000BK hall synthesizer
This unit is more than 20 years old, and has not gotten as much use as I
would have liked, for reasons I won't go into. Several years ago, when I turned it on after a long period of disuse, the VF display was scrambled and the unit didn't work. I let it "cook" for a day, and the (apparently) malformed cap that was causing the problem decided to behave itself. Several weeks ago, I finally got my rear amplifiers, so the JVC was restored to full-time service, and was working magnificently, until... You guessed it. About a half-hour ago, the display went dead and the outputs turned into a not-too-loud digital "buzz". The input is locked at "digital". (The default is analog, and you have to manually switch.) My guess -- and this is only a guess -- is that this a power supply problem. (The fact that all the channels went out does not automatically eliminate any of the LSIs, unfortunately.) I have the service manual, but before I start ordering mass quantities of electronics (or even start checking voltages), I'd like to know if anyone has any views. Please note that I don't expect anyone to diagnose what might be a messy problem from a distance. (I'll call JVC tomorrow, anyway.) I just wanted opinions. Thank you. |
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