Tempest Repair

Zinfer

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Well, I was testing an AR2 board in a Tempest. Heard a humm, then a pop - aw crap.
Now when Tempest starts up, it starts with CP LED's on and 40 credits. Push 1 player, select level, then a blank screen. You can hear it attempting to play, but the picture is not there other than a couple lines up and down.
Try diag switch. And I get indications that something on my Math Box is twirped.
I don't have any harness, Cat box or anything to deal with signature analysis of this PCB. Does anyone do Tempest Mathbox repairs?
Secondly, if this is the result of testing an AR2 - I almost feel like pitching it in the trash is the better option. Not sure how to go about fixing this AR2 if this is the result of testing it.

IMG_1387.jpg
 
I changed out the CR4 and then pulled all the old solder from Q5 and Q7. Resoldered them with fresh and found a drop of solder making contact between 2 pins on Q7. Not sure if that was the culprit, but the AR2 is working great now.
Unfortunately I don't know a thing about Mathboxes.
I looked over the Tempest boards and didn't see any visible damage at all.
 
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