Spy Hunter blowing fuses

Projammer

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Long story short. I picked up an old Spy Hunter standup that I was going to part out and determined that it was in too good a condition so I'm restoring it instead.

Progress so far. I've replaced a few components on the stack that were physically damaged when it fell over on the power chassis. Verified all the voltage levels on the power chassis and power supply and they're all good.

When turned on it immediately blows the 2A fuse next to the transformer. The marquee lights come on and the crt powers up to a solid magenta screen. Don't know if the monitor has a bad gun or a bad signal wire, get to that later.

I unplugged all the boards from the harness and added them back one at a time until I determined that the lamp driver board seems to be the culprit. With it unplugged I get a blinking light on the cheap squeak deluxe but no other activity.

I've set the dip switches for system tests but the led on the main stack does nothing at all.

This is my first resto and I understand that SH is one of the more finicky machines to get running.

So the questions..

Should I be getting any other activity with the lamp driver board disconnected or is that one of the system killers?

Anyone have any suggestions what I should do next? I would prefer to fix it myself of course but I'm completely willing to pull all the boards and ship them to someone with experience if that seems like the best course of action.

Thanks!
 
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Thanks. I've already downloaded the PDF from another site. While it's been useful, it looks like it was badly copied or copied from a well used original. When I was checking out the power chassis and board I discovered that on page 29 the connection from connector 1 on the chassis to 3 on the supply appears to show 8V on some lines while others are completely unreadable. Working through the circuit, the actual values should be 48V.

I picked up an original manual on eBay for cheap so it should be in shortly.

Right now I was was looking for info on whether having the lamp board disconnected should have the game completely shut down or if there are other issues I can be working on at the same time.
 
Yeah, I just deleted a 9MB Galaga manual for the one at xmission which was much smaller for the same reason, unreadable schematics!

Thanks. I've already downloaded the PDF from another site. While it's been useful, it looks like it was badly copied or copied from a well used original. When I was checking out the power chassis and board I discovered that on page 29 the connection from connector 1 on the chassis to 3 on the supply appears to show 8V on some lines while others are completely unreadable. Working through the circuit, the actual values should be 48V.
 
I'd guess that one of the drivers is shorted on the lamp driver pcb.

unplug the lamp driver and check the voltages to the pcbs. You should get +5, and +12v at the main pcb. The purple wire should also read +5v or thereabouts.
 
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