Star wars collapse

dethfactor

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Donor 3 years: 2011, 2013, 2021
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Picked up a Star Wars that coins up but all output is collapsed. Tested the boards in a known working cab/monitor so it is a board issue.
Any ideas what this could be?



bba94be5.jpg
 
reseat eproms first

Make sure none of them are backwards (although if you ran the game this long, you'd probably already crispied one by now and you'd smell it)

Just pull the board and make sure everything is nice and tight.
 
And check your voltages on the board.

+5V could be pulled low
+/-15 regulators could be failing/bad

Is there a 15v regulator on the board? The cab I was using works 100% I pulled a working SW board out of it and tested this board on it and this is what it was doing. I'll pull/clean reseat the chips and see where it comes up.
 
A 7815 and a 7915. The +/-22V inputs to the board are ONLY used to derive the +/-15V. See sheet 11B and 14A of the 2nd printing of schematics.

The problem could be anywhere but if your voltages are not good, you are wasting your time trying anything else, including reseating chips. :)
 
A 7815 and a 7915. The +/-22V inputs to the board are ONLY used to derive the +/-15V. See sheet 11B and 14A of the 2nd printing of schematics.

The problem could be anywhere but if your voltages are not good, you are wasting your time trying anything else, including reseating chips. :)

Sounds like a good start. I need to rebuild the brick on my cab now and get the voltage and all that figured out.
 
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