I finally took my stash of pinball machines out of "storage" after sitting in my other garage for five years. Now, in my new home, I have my United Supreme Bowler (System 3), High Speed (System 11 nothing), and two EM's - El Toro and Space Mission. None of them will be plugged in until I go over every board, solenoid, fuse, lamp socket, reel, power cord, whatever I need to do.
I've been following Vid's Bullet-proofing thread and replaced almost everything recommended in the threads on the System 3 bowler. I'm still waiting for a few more parts to complete that restoration. So in the meantime, I removed the boards from High Speed and I didn't notice the extent of the damage on the CPU/Driver board until it was out of the machine. I knew about the battery issue but then looked at the bottom left corner of the board. Oh Boy! I've read about this problem and was quite disappointed at what I saw. I'm sure someone can identify the cause of this issue and before I attack that I'm upgrading the TIP42's and TIP122's. I'll also replace the .4 ohm and 27 ohm resistors, all electrolytic caps and the battery pack with NVRAM. Finally, I'll start replacing many of the lamps with LED's.
I'll need to start ordering parts for this board, so I have a few questions.
- Can I replace the TIP122's with TIP122G that I have?
- Should I replace all of the resistor network packs or just the burnt ones?
- What would cause the damage at SW2?
- While I have my soldering iron HOT, is there anything else that should be replaced on that board?
- Will anyone say "Oh! It's not that bad."?