Baby Pacman

Nexus13

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Hey all,

I've got a baby pacman that had some serious battery leakage. This machine has a few problems I'm currently working with:

1.) Leaky battery and corrosion on MPU
- I've removed the batteries and installed a 5101 NVRAM and got picture!

2.) green wavelength missing
- I had good color for about 5 minutes and now the green color is gone gone
- I've contact cleaned all my pots and tested them with a multimeter and they seem good (including the vidiot board pots)
- I've also reseated and cleaned my chips and connections but I"m thinking the MC6809P might be bad? found some replacements on ebay
- I recapped the monitor and hooked up my Test pattern generator and the monitor shows green color fine

3.) left bumper fires repeatedly when held
- i've replaced the coil and little metal piece next to the coil but it just continually fires (i'll get a video for it with a later post)
- would the corrosion to the MPU have caused a problem like this? Not sure where to start looking for fix this part of my problem

4.) sound
- no sound at all
- i can turn up sound pot and the pot at the front but i just get background hum

Thanks in advance for your suggestions/help. Pics to come soon!
 
If there's only one thing I could have told myself when I started on my Baby Pac it's to bite the bullet and repin all those IDC connectors on the harness before any other troubleshooting. They're awful.
 
Would reflowing the solder joints with flux and new solder be good enough? or did you go through the process of removing all pins and puttin in new ones?!
 
Would reflowing the solder joints with flux and new solder be good enough? or did you go through the process of removing all pins and puttin in new ones?!

Sorry, it's a complete redo - especially if you had battery leakage. I'm assuming you're getting 10 flashes?

If you haven't seen this, it's a must read: http://www.pinrepair.com/bally/babypac.htm

Vidiot Test Button SW2.
In the middle of the Vidiot board is another test button SW2. After the Vidiot board boots, pressing this button should produce a short electronic space sound, and the Vidiot LED should flash twice. The LED flashes just twice because at power-on the first two LED flashes are related to the sound section. So pressing SW2 is just running this portion of the power-on LED code. The two LED flashes shows the sound CPU is running correctly.
 
Would reflowing the solder joints with flux and new solder be good enough? or did you go through the process of removing all pins and puttin in new ones?!

You need to do all of the connectors to the boards. Headers too. I replaced them all with Molex. Got most of what I needed from Big Daddy Enterprises.
 
Thanks for responses. Will these work?

Header Pins - 0.100" Centers
36-pin header row, easily cut to desired length
Perfect for Bally solid state circuit boards

iWttOgW.jpg
 
I had to completely redo the headers to the MPU on the Xenon at work, as it had extensive battery damage. it cleaned up pretty well otherwise and it boots up every time now.

I despise those .100 headers that Midway used because the pins bend so easily. aren't the plugs all crimped on pins? I don't recall the .100 ones being IDC.

I think they still used .156s for power, which those were definitely IDC. those you'll have to redo and probably just replace all the headers everywhere. I think the biggest problem with Baby Pac is all the interconnectivity.
 
I agree with these guys. A LOT of the problems are related to the header pins. Remove them all and replace them, especially if you have had a battery leak
 
I'm curious- what did everyone do when they had to fit 2 wires into the same header pin? I joined them together and then crimped them to a single wire which I put in the housing.

I'll take a photo tonight maybe... So people can see what I'm referring to. There were a few wires that were going into the old IDC connectors that didn't terminate and needed to continue onto the wire harness.
 
I did exactly the same

I'm curious- what did everyone do when they had to fit 2 wires into the same header pin? I joined them together and then crimped them to a single wire which I put in the housing.

I'll take a photo tonight maybe... So people can see what I'm referring to. There were a few wires that were going into the old IDC connectors that didn't terminate and needed to continue onto the wire harness.
 
I'm curious- what did everyone do when they had to fit 2 wires into the same header pin? I joined them together and then crimped them to a single wire which I put in the housing.

I'll take a photo tonight maybe... So people can see what I'm referring to. There were a few wires that were going into the old IDC connectors that didn't terminate and needed to continue onto the wire harness.

If you haven't seen my Baby Pac-man repair videos yet you might want to. I had to completely rebuild my MPU and re pin all the harness connectors going to the MPU. Battery corrosion can cause many different problems which may not be all your problems but it's a good place to start.
As for getting 2 wires in one pin on the harness I show how I did it in my video #4 Baby Pac-man Part 4 Replacing IDC connectors
 
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