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Such an innocent looking Black Hole, right? Doesn't look like a machine that would kick you in the nuts every day for the past month?
With the exception of three of the pop-bumper boards, every single PCB in this game has issues.
Power supply board: No high voltage. Had original caps, so was rebuilt. I didn't realize at some point I had blown the HV fuse. So, I don't know what exact component was actually bad. The lesson I learned is to check the fuse, then check the fuse again!
MPU: Was acid damaged. I carefully removed the obviously-damaged components, carefully cleaned the board, then replaced with new components. Still doesn't work. I'm not entirely convinced that the acid-damage was the original problem. I have tried to fix acid-damage previously, without success. The lesson I have learned: Do not attempt acid-damage repair! For me anyway, I have to pick and choose what my time is better spent doing. And my time is better spent making money doing something else and using that money to buy a replacement board.
Sound Power supply: Blowing fuses. The voltage regulator was dead-shorted. Replaced.
Sound Board: No Speech, and sound quality is not great. When the board is set for speech, the sound completely goes out at the point that the speech is invoked. I have been told that the likely culprit is one, or more of the 74LS75 ICs on the bottom left, next to the 7407 chip. I'm on the fence if I want to attempt repair. Even if I fix the speech, the sound would still be tinny. Swemmer sound boards will be available next month. I'm thinking of going in that direction.
And speaking of Swemmer, I have ordered an MPU and PS board. The Rottendog is working fine, and my extensively rebuilt MPU is working fine, but I need these for another project.
Pop Bumpers: At least two aren't working. I assume the Kicker boards. Parts on order.
Driver board: Bad 2N3055 transistor. I happen to have one that I had previously ordered by mistake. I guess if I'm going to own Gottliebs, I should have more on hand. At least it was an easy fix.
Light Chaser Board: One light is locked on. The rest chase dimly. I assume a shorted transistor.
I guess I shouldn't really complain. I just was hoping that there would be fewer things wrong with this machine.
On the plus side - the cabinet looks nice. The backglasses are in really good condition. Playfields are really decent. I'm thinking Translucent Titan rings, and Comet LEDs.