mecha
Well-known member
I got a Pole Position 2 boardset that was either untested or known non-working. one of the contacts on the video board edge was nuked, so I copper taped that. I plugged the boards in and noticed the LED on the CPU board was dead and measured voltage at the tabs and found it had no +5. considering the harness in this machine is damaged by way of power pins breaking off, I set out to run the test point voltage mod. here I discovered that +5 and ground were shorted.
channelmaniac suggested checking CR2 which is a diode on the +5 line, I lifted an end and saw it was reading 0.00 ohm both ways. grabbed another off a parts board and it all worked.
so in this condition if CR2 shorts both ways I guess it won't damage anything.
now to rebuild the AR2s and figure out why the steering wheel board isn't responding at all.
channelmaniac suggested checking CR2 which is a diode on the +5 line, I lifted an end and saw it was reading 0.00 ohm both ways. grabbed another off a parts board and it all worked.
so in this condition if CR2 shorts both ways I guess it won't damage anything.
now to rebuild the AR2s and figure out why the steering wheel board isn't responding at all.