Arcade Collecting > Pinball
Request: Help with Bally Harlem Globetrotters (Resolved)
TopJimmyCooks:
I did not hit the switch on the mpu, I'll try that.
I think I am going to send the thing out for professional repair. I am looking forward to going through and servicing everything, slingshots, flippers, etc. and as a pinball beginner I would like to start with a known good computer as a baseline. On all the em stuff, there are multiples (3 pop bumpers, 2 slingshots, etc) so if I jack one up, I can look at a working example elsewhere.
I really appreciate your input. Thanks.
TopJimmyCooks:
bit the bullet and bought an alltek mpu with the test board. with my luck I'd blow $100 on board work and have some other part on the thing crap out 6 months from now.
pbgarage:
Whole bunch of corrosion on that IC in the photo....
Needs to have a strip socket installed and a new chip. That
may be the problem.
You DO need to repair/neutralize all corrosion before all else.
Only time I've encountered "slowdown" in a pin, it was a bad game ROM(s).
Fred
TX
CARGPB#8
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--- Quote from: TopJimmyCooks on July 20, 2011, 11:30:16 pm ---pic of the mpu after my work:
--- End quote ---
TopJimmyCooks:
--- Quote from: pbgarage on July 28, 2011, 01:15:00 am ---
Whole bunch of corrosion on that IC in the photo....
--- End quote ---
Do you mean the 8 pin timer chip? (between R22 and R23) or the larger IC in the top of the picture? I have ordered parts to replace all the components in that area. The corrosion looks like it was worked on in 1996 or before according to the notes on the board, and the battery had been replaced with a capacitor. Everything worked before I moved the machine. I got a replacement board and have set this aside for now, but I do want to get it working if possible. it looks nothing like the boards posted in the guides as examples of bad corrosion. I just need to get busy and check all the traces and components, etc.
I really appreciate the input and I'll be back for more as I get into this project.
pbgarage:
The small one. Any/all corrosion is bad in spite of
anything you've read, anywhere. Until it's all taken
care of, all bets are off on how long a board will
hold up.
Fred
TX
CARGPB#8
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