Baby Pac-Man
Bally, 1982You're currently viewing posts by Pinsider jt-pinball.
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I am working on a Baby Pac-Man it was working fine, then it started to crash after it was running a few hours. The light on the Vidiot would stay on solid green. If i reboot it it would flash twice and stop. If I let it cool off the game will boot then after a game or two same thing. I twist the socket and it dose not seem to make a difference. I can't see it being the Vidiot EProms? Thoughts?
So when this happens you usually are playing the game and the video goes haywire and the play field about half stops working.
Quoted from ForceFlow:Sounds like it could be either overheating issue or expansion due to heat issue.
The first thing I would do is see how hot U16 gets, and possibly add a heatsink to it.
The second thing would be to check for cracked solder joints
After that, since the traces and pads are rather fragile on the vidiot board, I'd inspect for lifted traces or pads. And also hold the board up to a strong light to see if there are any broken traces. Sometimes this is the best way to catch those.
I have looked the board over pretty good but will do it again. I have experience in having a small nic cause big issues... Between you and jj44114 i am inclined to think this is probably a failing u16.... Thanks
ForceFlow
Quoted from jj44114:I think it’s the power diodes where the 12v comes in. I think there are three. Lower left corner of the board.
Ill check these out too just to be safe.
Quoted from jj44114:As your last resort I do repair these boards.
How about I pay you for your time and you help me out if I get in a jam? The fun of this for me is bringing life back into these games I loved as a kid for my kids and there kids to enjoy. The more I learn the easier it is for me to do that. Thanks for all your help on Pinside! Its nice having folks like you here.
Quoted from alexanr1:I am by no means even an intermediate level repair guy when it comes to pin boards. That said, one thing I look for first, is stable 5v and 12v. When I hear reboot, that’s what I immediately think. A simple multimeter can check both. Too low 5v and the MPU can act up. Many times the capacitors that provide a stable flow of power just wear out.
Additionally, any chance I get to reflow connectors, I do as well. Tends to fix many ghosts in the machine....
One final thing. If you have the original MPU in the machine, i hope it doesn’t still have the original battery on it, does it?
- My MPU was destroyed when I bought my machine years ago and I put in an ultimate MPU.
If you don’t have this, a great reference tool as well.
http://www.pinrepair.com/bally/babypac.htm
Go with jj44114 suggestions first though, much more knowledgeable on boards than I am!
Thanks alexanr1 I guess i could have mentioned a few other things about the game. I have rebuilt the power supply in this game and power is stable. I have also repined the male and female connectors on almost the entire game. All power and signal connectors have been rebuilt for sure. I have a replacement MPU in the game so no worries on that. Im pretty sure this is limited to the vidiot
Quoted from Robotworkshop:Are leads on the large video chip tarnished to black? They may also be brittle. I had one of these machines MANY years ago and had to do some work on the same board. If the leads are tarnished you will want to carefully clean them. You need to be really careful since leads that are blackened are also rotted and the leads will break off. Also some of the DIP sockets aren't the greatest. My chip was flaky so I had put in a new socket, fresh chip, and slipped on a 40-pin DIP heat sink to help ensure that chip stayed cool.
I'm sure that there are a few people on here that repair them if you get completely stuck.
Thanks Robotworkshop Yeah I have had my fill of crappy sockets. I am working to fix a Williams System 6 and had to pull every corroded gold contact RN Socket. Used up my supply of 24 pin EProm sockets and had to get more just in case the socket on the Vidiot was bad. I'm going to pull it out of game here this afternoon. I ordered a new chip for the TMS9928 at U16. Ill order a heatsink too as you and
ForceFlow have suggested. Yes I know plenty of people repair them, but expanding my knowledge to repair them myself is part of the fun.
Quoted from jj44114:It always helps to post clear closeup pics of the board here. We might see a problem.
Ill pull it out and post a few pics this afternoon.
Quoted from jj44114:I agree on the 5v for the video section. Might be failing. Power on, let it sit, see how hot the regulator gets.
Thanks jj44114 I will set it up on the bench when I get it out. this afternoon. I was going to test the power diodes and the output of the power supply as you and
alexanr1 have suggested. I mentioned rebuilding the power supply earlier that was the -132 not the one on the Vidiot.
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