Re: Help to fix a Lisa error 57

From: James MacPhail <gg__at_email.domain.hidden>
Date: Wed, 18 Oct 2006 16:17:43 -0700

>I need help to fix a Lisa error 57, that is a disk controller problem.
>I have an Apple Lisa 2 with 400 K floppy drive.
>I also get a error 82 with the internal hard drive.

I would expect the problem is dirty contacts:

Most likely:
- I/O Board card edge connector

Less likely:
- Power supply card edge connector

Clean with alcohol or electronic contact cleaner. (The latter often includes a silicone lubricant which is likely to preserve the life of the contacts by reducing friction and oxidation.)

You can use a pencil eraser on substantial corrosion/build-up, but be very gentle to avoid erasing any gold plating.

Of course there could be a more substantial problem requiring replacement of some part, but problems due to dirty contacts are now very common.

HTH, James

James MacPhail                   "Think not of engineering as art,
uo957_at_email.domain.hidden                 but of art as engineering"
Sigma Seven Systems Ltd.
james_at_email.domain.hidden        <>

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