Osbourne Executive help

From: Gerald D. Pine <gpine_at_popmail.mcs.net>
Date: Sat May 10 10:25:18 1997

At 11:36 AM 5/9/97 +0500, you wrote:
> I have an Osbourne Executive that is in fairly decent shape and for the
>most part works fine. There's no burn-in on the CRT and both floppies work
>great, but there seems to be a problem with the power supply or the video
>system.
>
> The system boots fine, but once it has booted, the image on the screen
>begins to jump or shimmer, and you can hear the fan on the rear of the machine
>appear to change speeds, as if there was a power fluctuation.
>
> I would really like to find out what's wrong with this machine, and repair
>it if possible, and am hesitant to run it the way it is. Any help would be
>greatly appreciated. Thanks.
>

Jeff,
I had (and still have to some extent) the same problem on my Executive. I
managed
to mitigate the problem somewhat by replacing the 12 volt muffin fan with a
117 volt
fan in order to reduce the load on the power supply. The shimmering was
reduced, but
not eliminated.
Gerald

> Jeff jeffh_at_eleventh.com
>--
>---------------------------------------------------------------------
> Sent from an Amiga 3000..the computer for the creative mind!
>---------------------------------------------------------------------
> Collector of classic home computers:
>
> Amiga 1000, Atari 800, 800XL, Mega-ST/2 and XE System, Commodore
> C-128D, Plus/4 and VIC-20, IBM 5155, Kaypro 2X, Osbourne Executive
> Radofin Aquarius, Sinclair ZX-81, TI-99/4A, Timex-Sinclair 1000,
> TRS-80 Color Computer-3 and Model 4, plus Atari Superpong and
> 2600VCS game consoles.
>
>
>
>
>
Received on Sat May 10 1997 - 10:25:18 BST