Space Duel Revival Log

pcjohn

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Had a DOA Space Duel.

No signs of life. Logic probe showed system was watchdogging.

Replaced the AVG - Same thing.

Replaced the CPU - Signs of life ! Coin counter was clicking and board was
resetting every couple of seconds. Powering up in test mode brought 6 low beeps
and 2 high beeps. Control test works (tones when pushing buttons) but still no
picture.

Replaced all 2114 ram. Beep sequence changed but now game controls didn't
play tones.

Oops ! Found solder bridge across a 2114 pin 8 to ground. Removed bridge and
control test now works.

Replaced buffers at B1, C1 and F2.

Powered up and board is fully functional !

This took forever. The chips were a major pain to remove. I found it
easier to clip all the legs then desolder what was left of the pins.

Hope this info helps anyone with a similar problem. It was a decent educational
experience although I hope I don't have to repeat it any time soon.

JD
 
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