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Museum of the Game® & International Arcade Museum® Forums
Hi. I have a BZ board that was working mostly. I replaced some sockets and it seemed to be working 100% so I let it run on the bench. A few hours later I checked and it was still running in attract mode but the vectors are all over and disjointed.
Now In self test mode with no aux PCB connected I get this:
With the exact same scope settings on a working board set I get this.
I have an FPGA CATBOX so I have done all the vector gen timing tests checked ram and Rom but no errors are found.
When using the CAT box on the failed board and draw a gunsight I get this:
Again with a working PCB with the exact same setting I get a gunsight that looks like this: looking at the pictures above it seems like the X axis is kind of right but the Y axis is drawn shifted really negative and maybe with wrong polarity? Any help would be appreciated. I'm thinking maybe y axis DAC? I probed all the inputs to both DACs and I see no obvious difference with the working and not working PCB.