Quoted from Arcade:
Here are the readings as of now with J114, 116,117 and 118 unplugged.
TP3 = 1.08
TP8 = 22.0
D1 = 21.5
D2 = 20.8
7812 = 11.98
Hmmm. All of those look OK, except for TP3.
It's evidence gathering time.
Remove fuse F115.
J114/6/7/8 all still off.
Game won't boot...that's OK.
Measure DC voltage at both left and right side of F115 fuse holder.
One side should have 12VDC.
The other side will have something, but its really inconsequential.
What we are gathering evidence for is a possible shorted LM339 at U6, which would be odd, but not impossible. Something on the driver board is dragging down the regulated 12V and that's about the only thing left. Your fuse holder at F115 is securely soldered, and there is no indication of alkaline damage, right?
In fact, snap and post a picture of the area left of the 7812, including the 7812. We might be able to see something
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The new place for pinball repair info