Re: Possibly the weirdest Tempest problem yet.

 I never did notice there was a short on the Mathbox. It worked
after I finshed joining the legs together. I did, however, find a
solder bridge between pins 18 and 19 of J19 on the Mainboard which
connects to the Mathbox. I think someone tried to resolder the pins
and pushed too much solder through. The solder bridge was underneath
the plastic of the connector so it was pretty tricky to find.

 Matt
 On Fri, 07 Dec 2007 18:42:30 -0800, John Robertson wrote: Matt J.
McCullar wrote: 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
Someone needs a Short Squeak! Great little tool for finding bus
shorts... It works by using a changing tone
to tell when you are
closer to the short, works in the milliohm range...
 John :-#)#
        -----Original Message-----
 From: owner-vectorlist@vectorlist.org [1]
[mailto:owner-vectorlist@vectorlist.org [1]]On Behalf Of Matt Rossiter
 Sent: Friday, December 07, 2007 12:09 PM
 To: vectorlist@vectorlist.org [2]
 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
 --
 John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
 Call
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                  www.flippers.com [3] "Old pinballers never die,
they just flip out"

Links:
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Received on Sat Dec 8 02:07:20 2007