ethyrvalve
Norman Nanoweber
Hi all,
I'm just looking at somebody else's 388 right now and I got most of the bugs worked out (it was a sick puppy) but unfortunately there's a tricky no-repro issue (input is OK) that follows cards. I got the person to order a couple spare cards off of ebay but one of those too has a repro issue. By shuffling cards around I'm able to get things down to one channel with no repro. I also have two extra cards with one good channel each.
So far I've tested the ESR of all caps and swapped the electromechanical relays with known good ones.
Just wondering if there are any known issues I should be pin-pointing? Or if anyone has already gone through the agony of mapping out the correct voltages of a known good channel?
Looking at the schematic, it seems like an issue with the solid state relay could be a possible trouble spot or maybe the quad NOR gate TC4001PB?
I'm just looking at somebody else's 388 right now and I got most of the bugs worked out (it was a sick puppy) but unfortunately there's a tricky no-repro issue (input is OK) that follows cards. I got the person to order a couple spare cards off of ebay but one of those too has a repro issue. By shuffling cards around I'm able to get things down to one channel with no repro. I also have two extra cards with one good channel each.
So far I've tested the ESR of all caps and swapped the electromechanical relays with known good ones.
Just wondering if there are any known issues I should be pin-pointing? Or if anyone has already gone through the agony of mapping out the correct voltages of a known good channel?
Looking at the schematic, it seems like an issue with the solid state relay could be a possible trouble spot or maybe the quad NOR gate TC4001PB?