Pole Position ram 8 error
I've been working on my Pole Position cockpit after finally acquiring a wiring harness. After successfully repairing the Matsushita monitor I've moved onto the pcb. I won't go beyond what knowledge I have and I know this board can very possibly be a real headache, but I thought I'd try a few things. Initially when powered on, the cpu board wasn't getting 5 volts and the 5 volts was very low as measured at the ARII. Without a load I could get the 5 volts from the ARII and I got the same results when swapping them so I knew it was something on the CPU dragging the 5 volts down from its ARII board. A visual inspection found CR2 to be suspicious looking and after removing it from the board you could see it was physically damaged as well as shorted according to the meter. Definitely bad. After installing a replacement, my 5 volt leds on the cpu came on, but only briefly and the diode crapped out again. I then tested it with a diode leg taken out of circuit and was able to get 5 volts to the cpu, although it was 5.5 with the adjustment down all the way on the ARII. I can tell my edge connectors need to re replaced so that's my next task. Am I correct in thinking the bad edge connector is causing CR2 to die? The boards and harness are from separate machines so no way to really know what killed the pcb before I got it with the bad CR2. I've already rebuilt both ARII's and even replaced both Big Blue caps. I need to also get some copper foil and touch up some of the card edge pins on the cpu pcb as well. If anyone can confirm I'm on the right track or offer any other ideas I'd appreciate it. On a "positive" note, the brief seconds I ran it without the diode, I have a ram 8 error. Joy.
Thanks!
I've been working on my Pole Position cockpit after finally acquiring a wiring harness. After successfully repairing the Matsushita monitor I've moved onto the pcb. I won't go beyond what knowledge I have and I know this board can very possibly be a real headache, but I thought I'd try a few things. Initially when powered on, the cpu board wasn't getting 5 volts and the 5 volts was very low as measured at the ARII. Without a load I could get the 5 volts from the ARII and I got the same results when swapping them so I knew it was something on the CPU dragging the 5 volts down from its ARII board. A visual inspection found CR2 to be suspicious looking and after removing it from the board you could see it was physically damaged as well as shorted according to the meter. Definitely bad. After installing a replacement, my 5 volt leds on the cpu came on, but only briefly and the diode crapped out again. I then tested it with a diode leg taken out of circuit and was able to get 5 volts to the cpu, although it was 5.5 with the adjustment down all the way on the ARII. I can tell my edge connectors need to re replaced so that's my next task. Am I correct in thinking the bad edge connector is causing CR2 to die? The boards and harness are from separate machines so no way to really know what killed the pcb before I got it with the bad CR2. I've already rebuilt both ARII's and even replaced both Big Blue caps. I need to also get some copper foil and touch up some of the card edge pins on the cpu pcb as well. If anyone can confirm I'm on the right track or offer any other ideas I'd appreciate it. On a "positive" note, the brief seconds I ran it without the diode, I have a ram 8 error. Joy.
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