[sebhc] Reviving an H89

Mike Shields shieldsm at gmail.com
Tue Mar 20 17:27:30 CDT 2007

Good news - it was just the switch. Cleaned it out a bit then worked it back
and forth till it sounded snappy, and it's all good to go. Thanks for
everyone's suggestions.

Now I've got a 16k ram upgrade (to take it up to 64k) and a serial I/O board
to install. The serial I/O is more important, I'll probably tackle that
first. I'm sure I'll be back to bug the list again!

On 3/20/07, Peter Shkabara <peter59 at sbcglobal.net> wrote:
>  Hi Mike,
> As has already been suggested, check the power switch. Actually, any such
> troubleshooting would involve checking for power starting from the power
> cord. Also, a common failure mode on the H89 was the Molex connectors. You
> may want to disconnect and clean each of them just for preventative
> maintenance. Good luck.
>  Peter
> ----------------------------------
> peter59 at sbcglobal.net
>  ------------------------------
> A brief introduction - I'm probably a little younger than most of the
> group, but I started my career as a programmer (at 4 years old in BASIC) on
> the H89 that my father assembled. I grew up reading REMark and Sextant and
> helped to build and upgrade an H-150 along the way.
> Well, I recently took possession of the H89, did a quick interior dusting
> and exterior cleaning, and attempted to power it on. But, powering it on
> does nothing. No fan, no clicks, no smoke, nothing at all. The fuse is fine.
> I did a quick visual inspection of the power supply (without removing
> anything) but didn't see anything amiss, and there's no scent of smoke. I
> was the last one to use the machine, but I don't remember having any
> problems with it. (Although, that was 15-20 years ago, memory isn't perfect)
> Mike Shields
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