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Message from discussion Roland HP-860 electronic piano has HUM
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Gareth Magennis  
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  More options Sep 6 2008, 6:24 pm
Newsgroups: sci.electronics.repair
From: "Gareth Magennis" <gareth.magen...@ntlworld.com>
Date: Sun, 07 Sep 2008 00:24:14 GMT
Local: Sat, Sep 6 2008 6:24 pm
Subject: Re: Roland HP-860 electronic piano has HUM
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"Josh9.0" <squalene...@hotmail.com> wrote in message

news:c8303b5a-34a1-49ce-896d-2f0184d07eff@25g2000hsx.googlegroups.com...

>> Er, what exactly is this 46 volts supposed to be doing?  I doubt there is
>> anything like 46 volts anywhere near the keyboard.

>> Please try again.

>> Gareth.

> Yes... I checked it again. it's a common to all keys. No... there's
> little chance of electric shock, as there is a lot of plastic between
> the user and the switches.

> Sorry for jumping to conclusions. It's what I do, sometimes.
> And... as you will know, aluminum electrolytics are prone to going dry
> given a few decades (or less) !

Your measurement is incorrect.  No way is there 46 volts around the
keyboard.  Possibly 4.6 volts, a slight but possibly acceptable drop from
the 5 volt supply.

You are still wanting to find the answer in dry aluminium electrolytics or
something else.  Stop trying to make the symptoms fit your conjoured up
answer. This is not the best way to fault find.  You need to establish some
facts.  So far you have virtually none at all.   Go get some and stop
guessing.  Really.

Gareth.


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