Arcade Collecting > Restorations & repair
Asteroids Deluxe resurrection
ChadTower:
From the Asteroids Repair Encyclopedia:
13. Problem: Game played but nothing on the screen except for a general glow that varied as the game was played blind, X and Y outputs were erratic
Fix: 7915CT voltage regulator at VR2 was bad
ChadTower:
More research turns up proper ranges:
+10V to -10V on the X out or+7.5V to -7.5V on the Y
I'm hoping that retinning the edge contacts and cleaning the harness pins take care of that...
ChadTower:
Folks on RGVAC seem to think it's bad op amps in the XY section of the PCB. Seeing as how I don't know what op amps are yet, I have some reading to do. A quick RGVAC search on "op amp" seems to turn up 90% questions about vector games, so I'm assuming at this point it's something specific to vector PCBs... will keep updating as I turn up more.
Or am I updating too often? I figured since I'd received so many PMs in support, maybe folks would be interested in following the research/learning curve as well. LMK.
SirPeale:
Updates are great. Gives a play-by-play repair log.
ChadTower:
Cool. So far, googling RGVAC has turned up that the op amps are 8 pin chips, so that should make them easy to find down by the X/Y test leads. Tempest uses a TL082, I guess, so that's another clue. Seems that nonvectors also have op amps but they fail a lot less there.
I've also seen suggestions of bad DACs... a quick google turns that up as Digital to Analog Converter, which I figured anyway.
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