John Robertson has been helping me with a strange set of problems in my Gorgar. John seems to think that the Rottendog replacement board I installed is the problem. But I returned the first board I ordered and got another, and have the same problems. So my question is, does anyone here have a Gorgar with a Rottendog MPU-327 board and NOT have any issues? That would rule out a design defect in the Rottendog board. Note: I have the same MPU-327 board in my Firepower machine, and that works perfectly.
It's many more seemingly unrelated problems than just the rollover switches. I spoke with the company I bought it from, Pinball Life, and they were nice enough to send me a second board to try. As I mentioned. I tried to reach Rottendog but they don't answer their emails and there's no phone number listed on their web site. But surely someone somewhere must have a Gorgar with a Roittendog board in it. Hence my second post today.
you did try the Switch Test to see what switches were registering whenAha, you may be on to something! The switch test doesn't show multiple hits, but one of the affected roll-overs shows up as stuck. I press switch 27 down that and the display shows 27. Then I hit the next switch over and that displays 28. But then a few seconds later 27 displays again. Same for other switches after hitting switch 27. The display pops up 27 again rather than remain showing the last switch I hit.
you activated the switches that are giving trouble?
Hi again John. I re-ran the diagnostics, and as before it looked like one of the roll-over switches is stuck. But it's not. I checked the gaps on all three switches in the group, and also verified all three switch diodes are good and not shorted. I said earlier that another problem is the score for players 3 and 4 "slip" and lose points as the game plays. When the diags got to the score displays, players 3 and 4 were wrong showing 111111 or 222222 when players 1 and 2 were up to 777777 and 888888. So the problem is still a bunch of unrelated things. My next step is to examine closely all the Molex connectors that go to the Rottendog board, that used to go to both the CPU and driver boards. Maybe something is loose, or a single strand of stranded wire is shorting an adjacent pin. Those connectors are old, and some have been replaced and repaired and look a little messy.--- Synchronet 3.19a-Win32 NewsLink 1.113
there was a problem with rottendogs on sys3-6 games where the upper right mounting screw would ground out one row of the switch matrix.
On Tuesday, April 18, 2023 at 12:45:43 PM UTC-4, Ethan Winer wrote:--
Hi again John. I re-ran the diagnostics, and as before it looked like one of the roll-over switches is stuck. But it's not. I checked the gaps on all three switches in the group, and also verified all three switch diodes are good and not shorted. I said earlier that another problem is the score for players 3 and 4 "slip" and lose points as the game plays. When the diags got to the score displays, players 3 and 4 were wrong showing 111111 or 222222 when players 1 and 2 were up to 777777 and 888888. So the problem is still a bunch of unrelated things. My next step is to examine closely all the Molex connectors that go to the Rottendog board, that used to go to both the CPU and driver boards. Maybe something is loose, or a single strand of stranded wire is shorting an adjacent pin. Those connectors are old, and some have been replaced and repaired and look a little messy.
there was a problem with rottendogs on sys3-6 games where the upper right mounting screw would ground out one row of the switch matrix.Hopefully that's been fixed, but I will definitely check that out on my board! --- Synchronet 3.19a-Win32 NewsLink 1.113
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