NVRAM battery replacement

Allison ajp166 at bellatlantic.net
Fri Apr 8 22:28:17 CDT 2005

>Subject: NVRAM battery replacement
>   From: Saquinn624 at aol.com
>Ethan- the DS1287 is the one used in SGIs (I2, Indy), isn't it? how did you 
>go about fixing it? [e.g. where in it is the batt. &cet.](all of my SGIs are 
>currently working, but the clock is ticking . . .)

I've repaird DS1287s used for PCs.  The cast resin case of the chip is 
actually over a regular plastic dip package.  The battery is easy to 
locate with a small magnet. Once located you scrape or sand the resin 
in that area to expose it then pry it out. The battery used is a small
diameter 3V lithium cell and has a fairly hard steel case so it's easy
to sand or scrape down to it but, not through it.  The two leads are 
there and careful soldering will attach new leads to an external 3V 
coin cell holder.

I've done this on maybe 10 of them.  We had a rash of 486/133 PCs at 
work that were about CA 1998 and the batteries were failing (in 2002-3).


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