Arcade Collecting > Pinball
Black Knight
ChadTower:
Every .156 header on the power board replaced, all of marvin3m's recommended power board upgrades done, board recapped. Came up one 100uf 150v cap short so that's still there. Also found a disc cap that had one leg broken off, wonder which issue that has been causing. Don't have a replacement on that either so it goes on the list of things I still need to pick up.
ChadTower:
Popped the power board back in minus that missing disc cap... figured it was broken before, can't hurt anything now. Everything seems about the same, which again is good, since I wasn't fixing something I was upgrading/refreshing it.
The playfield lights DO look brighter but that could easily be my imagination. ;D It's still really dirty under the playfield as I haven't gone under there at all yet.
ChadTower:
Four new sockets on the speech board - still no speech.
ChadTower:
--- Quote from: pinballjim on June 23, 2009, 09:34:03 am ---You did check the pot on that board, didn't you? ;)
--- End quote ---
Yep, but those sockets had to go anyway. I haven't found yet what the actual resistance range should be on that pot so I'm not 100% sure it's good but I do know it's not open.
EDIT: I should note I'm also only getting one sound from the sound test too so I'm not even 100% sure the problem is the speech board yet. Individually grounding the select pins do get all sounds but the sound test only plays one of them.
--- Quote ---Steve Ritchie is currently autographing anything that will take ink and selling it on RGP, someone told me his house was in or close to foreclosure, too. Kinda sad, he was a rich man in the 90s (though I've heard it was primarily from MK2 of all things)
--- End quote ---
Yeah, been listening to the old topcasts in my car while commuting, and apparently a number of those Williams guys ended up at Midway across the street.
ChadTower:
With some guidance I have traced the sound problem to the CPU board. Haven't tracked it down to the direct cause yet but I'm getting closer.
Synopsis:
Grounding sound select pins individually on the sound board, with the CPU connector removed, generates sounds. Doing the same with the CPU connector on generates nothing. Should be 5v on each of the sound select pins (with CPU connected) but two of them are almost at ground, likely meaning they are shorted somewhere. Since it is only a problem with the CPU connected it's likely on the CPU. The harness from the CPU to the sound board tests good. Next step is to pull the CPU, replace all sockets and critical headers anyway, plus the male side of the 40 pin interconnect. In the process I'll socket the sound PIA so I can swap it.
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