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- Apr 16, 2012
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Hi all,
If you recall, I'm working on a Midway Space Invaders. At first I didn't get video, but on inspection, the ground on the tube was not installed properly. I removed it, cleaned and burnished the connectors, bent the bracket so it would contact the tube, and hooked it back into position. It is now in good contact with the tube, where it should be.
I pulled the A frame and cleaned all the connectors. Then I took a hard look at the board.
There are a few issues.
The diode next to (to the right of) the 7474 is broken - one leg is sheared off. I can't seem to find a parts list for the motherboard - does anyone know what the right diode is for this application?
Also, one of the chips looks like an ePROM - half the cover, including the middle is missing. I didn't know which one, and didn't find any "chip pieces" in the bottom of the cabinet, so it's likely been like this for some time.
So, two questions:
1. Does anyone have a parts list for the mother board?
2. Does anyone have experience with running a chip with "the top down?"
Please advise.
If you recall, I'm working on a Midway Space Invaders. At first I didn't get video, but on inspection, the ground on the tube was not installed properly. I removed it, cleaned and burnished the connectors, bent the bracket so it would contact the tube, and hooked it back into position. It is now in good contact with the tube, where it should be.
I pulled the A frame and cleaned all the connectors. Then I took a hard look at the board.
There are a few issues.
The diode next to (to the right of) the 7474 is broken - one leg is sheared off. I can't seem to find a parts list for the motherboard - does anyone know what the right diode is for this application?
Also, one of the chips looks like an ePROM - half the cover, including the middle is missing. I didn't know which one, and didn't find any "chip pieces" in the bottom of the cabinet, so it's likely been like this for some time.
So, two questions:
1. Does anyone have a parts list for the mother board?
2. Does anyone have experience with running a chip with "the top down?"
Please advise.


