On 10-May-97, classiccmp(a)u.washington.edu wrote:
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,
Then would you say the power supply is getting weak? It looks like the fan
in the back is a standard enough part...in fact, there's room there for a
larger one, as the one installed isn't even as large as the grill opening.
I'll try that though and see what happens. Thanks for the tip.
Jeff jeffh(a)eleventh.com
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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.
Jeff,
I think that the design using a 12V fan was just a bad idea. It put a
load on the power supply that need not be there. I think that the
problem was inherent in the Executive design.
Gerald