Speaking as a fellow service tech, I'd have to go along with Alex's response. Sounds to me like someone was trying to isolate a shorted power bus. Look very carefully at that mathbox board for something that has been replaced in the past... such as a bypass cacitor or something else that could short the +5 volt bus and ground together.
Avoid spikes!
Matt J. McCullar
-----Original Message-----
From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org]On Behalf Of Matt Rossiter
Sent: Friday, December 07, 2007 12:09 PM
To: vectorlist@vectorlist.org
Subject: VECTOR: Possibly the weirdest Tempest problem yet.
I just finished fixing a box of Tempest boards this week that I had sitting around for a long time. I came across one that had some miserable problems with the Mathbox. After careful inspection I noticed someone cut the +5v legs of most of the IC's on the board!! Someone actually went though the trouble of RUINING a tempest board. I'm happy to say I bridged all those cut legs with a clean solder bridge and repaired the main board and it's back in business.
Has anyone else had to fix a deliberate sabotage? :)
Matt
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Received on Fri Dec 7 21:05:43 2007
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