[sebhc] Reviving an H89

[Barry Watzman]

Start with the power supply, obviously.  If you have no fan, that has to be
the problem.  It's an old-fashioned analog supply, so should be easy to
troubleshoot if you have the schematics.

 

  _____  

From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of
Mike Shields
Sent: Tuesday, March 20, 2007 1:07 AM
To: sebhc at sebhc.org
Subject: [sebhc] Reviving an H89

 

Hello everyone,

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)


Just looking for suggestions as to common failure modes that would result in
stone-dead behavior. I have some spare H89 parts that I'd like to upgrade it
with, but I've got to get it firing up first - I've got meters, scopes, and
experience with them, so any suggestions at all are welcome. I do have the
schematics and manuals for it, so pointers to those are fine too. 

Thanks, and long live Heath!

Mike Shields

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