Arcade Collecting > Restorations & repair
Centipede Mini Restoration
SirPeale:
Years ago I bought a 2 1/4" trackball on eBay for a pittance. I'd forgotten all about it, only finding it a couple days ago in a box of other stuff.
Glad I did; the original on this needs a serious rebuild as the bearings stick and the rollers are so worn you pinch your fingers constantly. This one has nearly *no* wear on it at all, plus handles like a dream. I need to swap a couple input wires as the up/down are backwards, but that's it.
And I realized I can't rule in/out the EAROM yet because I still haven't gotten the voltage correct yet. Can anyone tell me what kind of caps are @ locations C87 & C88? They *look* okay, they're not burnt or anything, but I'm still only getting 1/2 the voltage on the -30VDC test point.
Level42:
--- Quote from: Peale on October 21, 2008, 09:15:00 pm ---Years ago I bought a 2 1/4" trackball on eBay for a pittance. I'd forgotten all about it, only finding it a couple days ago in a box of other stuff.
Glad I did; the original on this needs a serious rebuild as the bearings stick and the rollers are so worn you pinch your fingers constantly. This one has nearly *no* wear on it at all, plus handles like a dream. I need to swap a couple input wires as the up/down are backwards, but that's it.
And I realized I can't rule in/out the EAROM yet because I still haven't gotten the voltage correct yet. Can anyone tell me what kind of caps are @ locations C87 & C88? They *look* okay, they're not burnt or anything, but I'm still only getting 1/2 the voltage on the -30VDC test point.
--- End quote ---
You could also use the "old" optic boards on the new trackball, simply move them over.
About the C values: it's time you download the schematics....
http://arcarc.xmission.com/
SirPeale:
--- Quote from: Level42 on October 22, 2008, 11:31:43 am ---You could also use the "old" optic boards on the new trackball, simply move them over.
--- End quote ---
The optic boards work fine; I just have to swap the two wires in the trackball harness. Ten seconds with a Molex pin removal tool vs ten minutes of disassembly/reassembly.
--- Quote ---About the C values: it's time you download the schematics....
http://arcarc.xmission.com/
--- End quote ---
It's not the values I'm concerned with; what kind of caps are they? I already have the schematics. They say they're a ceramic disc type (.1uf), but these don't look like other ceramic disc caps.
ChadTower:
Not all ceramics are discs... learned that on the Tank II. Mine looked like corn dogs.
SirPeale:
More importantly, how do I test them?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version