Arcade Collecting > Restorations & repair
1981 Ms. Pac-Man restoration
SirPeale:
I read here:
http://www.mikesarcade.com/arcade/repairs/mspacman.html
That one of the resistor packs was broken in pieces when he unsoldered it. Check it.
Finalheaven:
Here's the current update:
I've fixed the random reset problem. I'm not sure if it was related to bad eproms at 6H and 6J, but after noticing their pins were brittle and falling apart, I replaced both eproms. This was after fixing the edge connector which didn't seem to change my status (random resets, vertical hum bar, down direction). Regardless, after updating 6H and 6J and soldering a new edge connector, the resets were gone and I was still stuck with a vertical hum bar and Ms. Pacman constantly going down (she'll accept directional inputs, but then still head down afterwards):
After that, I wanted to clear up the vertical hum bar problem. I read the paragraph about it on lawnmowerman's pac-man page, and I knew I had already fixed the edge connector, so I replaced the fuse block. Vertical hum bar is now gone:
I'm SO close to being finished, but I still have this constant down direction problem. She's still controllable, but always heads down by default and will return to that direction if no other input is given. Since I've already replaced the 74LS367 chip and socket at 8E, my last thought is a short on the board. I did notice when installing the new 16 pin socket that the traces around the sockets holes were very close together and unprotected by the usual green PCB stuff (I forget what it is, but it's not conductive). I have a logic probe coming tomorrow as well. I'm hoping a reinspection of the underside of the PCB around 8E and a logic probe will help me uncover my final problem. Then I just need to get the coin door lights working (that should be a cinch after this stuff).
saleem:
i dont know about this one.but,have you checked or replaced the down microswitch on the control stick,pretty obvious isnt it,worth a shot.
:)
SirPeale:
Did you check the resistor packs?
Also check the capacitor on that line.
I started a thread @ KLOV: http://forums.arcade-museum.com/showthread.php?t=137534
Finalheaven:
Thanks a lot for that. I should register for those forums as well.
I have done a thorough test with the down direction (which is the top switch) disconnected and the entire panel's molex disconnected as well.
I believe the resistor on the down direction path is R45 (from memory). None of the resistors look fishy though, but looks can be deceiving. As for the capacitor, checking the manual, it looks look... (checking) C20 is the capacitor responsible.
In the other forums, is that the capacitor he is suggesting I disconnect?
While I'm not through the storm yet, it makes it all bearable with help from you guys, so thanks for that.
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