Arcade Collecting > Pinball
I finally got a pin...RESTORED AND LOVING IT.
ChadTower:
2n3055 is a power amp transistor... so if you're in doubt, swap it, I'd say.
Yeah, pins are a LOT more fun than cabs. You're starting with good electrical knowledge, too, which is making it pretty fast.
Be careful around those spider chips on the cpu board. IIRC they're custom to Gottlieb and the only replacements are pulls from other boards.
alexred:
I have a Gottlieb Count-Down from the same era. You should really consider replacing the power supply with a new RottenDog. All new components and all the ground mods are built in. That or get one of Pascals boards that replace everything.
ChadTower:
That will make it bulletproof - though he still has to do all of the connector refurb work. It will make it costly, as well. If I do that with my Sinbad, and I'm considering it, I will still repair all of the original boards. So he may as well keep going, IMO.
shardian:
--- Quote from: alexred on September 01, 2007, 09:50:40 am ---I have a Gottlieb Count-Down from the same era. You should really consider replacing the power supply with a new RottenDog. All new components and all the ground mods are built in. That or get one of Pascals boards that replace everything.
--- End quote ---
I'd really prefer to learn and fix the existing boards. Plus, I just don't have the finances to get the Pi1 X4 (though that would be ideal). My power supply is missing diodes and resistors in several areas, so I'm gonna have to learn to read electrical schematics REALLY good to figure out where and what to replace with.
In the end though, I might go ahead and get a replacement power supply. That is really the first line of defense.
shardian:
Ok, I did the battery acid corrosion damage control on the MPU. There were some resistors and one of the spider chips that had corrosion on their legs. I'm not too sure how much effect that will have, but I did my best, and as you can see in the first pic, most of the corrosion is gone on the spider ship, though there appears to be some white buildup down at the board level. There were some traces that were corroded as shown in the second pic. On the back, pretty much all of the bottom pins were badly corroded. You can see from the last pic that I had to sand down to copper on all but the far left few. ;D I'll tin all of those connectors over the next few days. I really, really, really hope I can salvage my MPU board as I really, really, really don't want to have to plunk down $200 on a new replacement. And I'll tell you, salvaging those spider chips from another board would be damn near impossible to do without damaging them somewhere along the line.
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