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Newsgroups: sci.electronics.repair
From: Archon <Chipbee40_Spa...@yahoo.com>
Date: Sat, 06 Sep 2008 23:13:00 GMT
Subject: Re: Roland HP-860 electronic piano has HUM
Gareth Magennis wrote: Thats because searching for any electronics problem on google comes up > "Josh9.0" <squalene...@hotmail.com> wrote in message > news:b5bb74fd-fccb-4579-a414-fa7ac9e673cd@c58g2000hsc.googlegroups.com... >> No I haven't! >> Thanks for the tip, and thanks for the quick reply! >> I'll go and try it now. >> It has a bunch of different voltages out, and they're labelled on the >> PCB! >> I guess I should look for ripple on what should be DC, right?? >> Then trace it back to the offending cap(s). >> Then go buy some new ones of those only. >> BTW: It has a main voltage going to all the keys of 46V which measures > You seem to be jumping to lots of conclusions for no apparent reason. > What's with this "offending caps" businsess? You seem to have decided there > You need to investigate and gather information. You start with the power > Gareth. with "check all the electrolytics", ESR is the new religion. I get so many people bringing stuff to me saying, hey its probably a cap, you got an ESR meter?, can't be more than 10 bucks to fix. Yeah right. A little bit of knowledge can be dangerous. Good luck to the OP, with a scope should be an easy fix. You must Sign in before you can post messages.
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