scotth
New member
I recently picked up a Pole Position. It's my first real arcade machine. I have a MAME machine, so I'm not totally new...
The car sprites aren't showing up in the bottom 1/3 of the screen. According to the Service manual the "large car pictures" come from Custom ICs at 12J and 13J. The text on the start finish line is missing, and the billboards go blank when you get close to them. I've listed what trouble-shooting steps I've gone through. And would like some ideas to go through before sending the boards out for professional help. Thanks.
There's a sticker with a 1994 date on the board. So it's been worked on at least once. This picture shows some of the newer looking chips on it and what is that blue wire, that is soldered to a few of the chips?
Is this the battery I need to remove? Also, is the trace to the left of there bad?
The car sprites aren't showing up in the bottom 1/3 of the screen. According to the Service manual the "large car pictures" come from Custom ICs at 12J and 13J. The text on the start finish line is missing, and the billboards go blank when you get close to them. I've listed what trouble-shooting steps I've gone through. And would like some ideas to go through before sending the boards out for professional help. Thanks.
- I ran the self-test, and it says everything is fine.
- I checked the two chips at 12 and 13J they don't show any visual signs of damage. I removed and reseated them.
- Someone put a switching power supply in the machine along the way, it powers the boards.
- I messed around with the adjustment on the power supply, it seems happiest at about 5.1v.
- When the power at the switcher power supply is 5.1v, I measure 4.5v t the +5 and ground on the side of the board. I can crank the switcher up to 5.5v to get 5v at the board, but still no large sprites.
- I need to redo the edge connectors. They have some burn marks and solder repairs.
There's a sticker with a 1994 date on the board. So it's been worked on at least once. This picture shows some of the newer looking chips on it and what is that blue wire, that is soldered to a few of the chips?
Is this the battery I need to remove? Also, is the trace to the left of there bad?
