Arcade Collecting > Pinball
Black Knight
ChadTower:
Definitely. Manual says the two drivers are Q9 and Q19. Could be either, I guess, since Q19 is matrixed to one of the unused coils so there isn't a second dead coil to point it out.
ChadTower:
Q19, definitely bad. So are two of the three resistors right above it. Interestingly, I found a broken off resistor a few spaces away, and didn't get anything in test that would indicate a problem on that coil...
...anyway, I have a TIP120 on hand but not the right resistors. So I'll have to see if Rat Shack has them otherwise it's a weekend trip to You Do It.
ChadTower:
Heh. On boards I don't want as keepers I'd do that. I'd rather just hold off a bit and use the right parts on a full project, though. Looking back I would have been better off swapping boardsets with the Laser Cue and doing the upgrades on that one. I had totally forgotten how clean that boardset is until I pulled the sound board the other day.
I cut out the 2N440 above that transistor too. There is some burn damage to the PCB under the TIP20 that you couldn't see with it folded down. I had rebuilt an iffy trace repair on the backside of this transistor already and forgotten. I think I'm going to run a couple short wire jumpers here for the other traces off this transistor just to be sure they aren't going to fry when I run current through it again. They are beeping out but are burned right off the board. I might have to use a dab of glue on the topside to secure the TIP20 in place, too.
BTW, I know I go way too far into the details in these threads. I do that because these are my project notes. I work on these things in 20-30 minute intervals that aren't always close together. If I don't keep notes like this I spend too much time trying to remember exactly what needed to be done next.
shardian:
--- Quote from: ChadTower on October 28, 2009, 09:06:53 am ---
BTW, I know I go way too far into the details in these threads. I do that because these are my project notes. I work on these things in 20-30 minute intervals that aren't always close together. If I don't keep notes like this I spend too much time trying to remember exactly what needed to be done next.
--- End quote ---
I do the same thing. It is nice to have a time-stamped log of what all you have done. My wife thinks I'm silly that I'll do troubleshooting for a bit then immediately get on the pc to type out my results and thoughts.
ChadTower:
It was really helpful in the Tank II thread. I got a lot of great feedback and probably wouldn't have figured out the monitor brightness issue otherwise.
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