Boot Hill Project

[supadave]

This is continuing from this Thread: http://forum.arcadecontrols.com/index.php?topic=92714.0

I picked up a nice Boot Hill machine from CL and I've started some work. You can see pics below or over at http://boothillarcade.blogspot.com  I did some work on the machine and I did get the monitor to boot. It is having some issues that is similar to what I found below in the next line.

I found some valuable information over at http://www.marvin3m.com/video/seawolf.htm

"The last issue with these boards is the power supply. It gives +5, +12, -5 volts DC to the main boardset and sound board. But the power supply does more than that. There is a delay reset circuit on the power supply. If this reset circuit is bad, the boardset (even if good) will not boot. This is why it's difficult to change the original power supply with a switcher. The reset circuit provides a delay, so the 5 volt supply can statablize. On newer games (1980 and later), this delay is built into the CPU board, and is not part of the power supply. But on these older Midway games, the reset delay is part of the power supply. So even if the +5, +12, -5 volts is good, if the reset circuit is bad, the game won't boot. "

They show an example of what a good Sea Wolf board with a bad power supply reset circuit looks like and it is very similar to what my Boot Hill does. I also found another site that give you step by step directions on testing the power supply and the reset circuit. http://www.elektronforge.com/TestMdwPS.htm I"ll test and report what I find.

[RetroACTIVE]

I'm digging that cab!  It's in really good shape too! 

[RetroACTIVE]

I've no experience with this game... but if you are suspecting power supply problems... First start by checking  and cleaning all your power harness connections... Then I would definitely rebuild that power supply board... replace everything you can,  caps, transistor(s) and regulator(s).  Its not always necessary to replace everything, but that bad boy is no spring chicken so it certainly can't hurt.  You'd be surprised at how many times a complete power supply rebuild fixes these things. 

[IG-88]

Chad ought to love this sucker!