Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!oliveb!amiga!cbmvax!grr
From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: A500 hummmmmmmmmmmmmmm
Message-ID: <4006@cbmvax.UUCP>
Date: 10 Jun 88 23:15:16 GMT
References: <620009@otter.hple.hp.com> <4580005@hpscdc.HP.COM>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 19

In article <4580005@hpscdc.HP.COM> hal@hpscdc.HP.COM (Hal Work) writes:
> I also have, and am still having this problem.  I have two small Sony
> powered speakers attached to my 500 and get an intermittent hum.  Sometimes
> it's there, sometimes not.  I'd love to find out how to stop it.

As the other person suggested, check your RS232 cable for connections
to pins 11 and 18.  Snip any such wires.  Of for more the most effective
truncation, remove R339 and C502.

Any remaining noise represents either grounding problems or power
supply / ground noise within the system you can't easily defeat.

The audio connections on the RS232 connector were a gesture towards
A1000 compatibility - support for "answering machine" type applications.
Oh well...

-- 
George Robbins - now working for,	uucp: {uunet|ihnp4|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)