Re: Screen Stabality Fix

From: James MacPhail <gg__at_email.domain.hidden>
Date: Sun, 14 May 2006 16:11:26 -0700

>the whole screen shakes a lot
>when the hard disk power is plugged in (this is a 2/10 with a 1.8A
>unit). Does this indicate my power supply is weak?

I think this indicates there is a bad filter capacitor in the PSU, I would guess either C25 on +33V or C26 on +12V.

I suppose there could be some other causes, such as a bad rectifier CR24/CR26, or a problem with the HD.

You might be able to track down the source by measuring the AC ripple on the various outputs. If you don't have test equipment, then it may be easiest to just replace those filter caps.

With the 1.8 amp PSU repaired, the video board modification is probably unnecessary. AFAIK, it was primarily applicable to the 1.2 amp PSU.

HTH, James

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. Received on 2015-07-16 07:48:42

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