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I need help repairing a Yamaha SPX-90 (power supply is flaky)
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Sam Lloyd wrote: Anyone have any idea what might be wrong with mine? The PS is very "touchy" when adjusting the pot, and the voltages jump up above their proper levels (I get around 7-8 VDC on the 5V rail, and around 38VDC on the +/-18). I replaced the electrolytics and one of the optoisolators, but it's still screwy. Sounds like it jas nothing to do with the electrolytics or optoisolators. If it's jumping around when you adjust the pot, it's a strong hint that the pot itself is flaky. -- | Dick Pierce | | Professional Audio Development | | 1-781/826-4953 Voice and FAX | | | |
#2
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I need help repairing a Yamaha SPX-90 (power supply is flaky)
"Sam Lloyd" wrote in message ... Anyone have any idea what might be wrong with mine? The PS is very "touchy" when adjusting the pot, and the voltages jump up above their proper levels (I get around 7-8 VDC on the 5V rail, and around 38VDC on the +/-18). I replaced the electrolytics and one of the optoisolators, but it's still screwy. Also, apparently this overvoltage has killed some of the digital ICs because the display doesn't display properly, and there's no audio, although the op-amps seem okay. Any advice? Sorry, but supplying 8 volts to a 5 volt digital circuit is almost guaranteed to blow some chips, and from the symptoms I think you're right. I wouldn't waste any time or money trying to repair this unit and I don't think many professional repair guys would either- pick up a used one instead. Gareth. |
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