Recent content by fjm_48

Can anyone tell me for sure whether a Model 8500/9500 cpu card, 820-0849-A, is compatible with the 7500 logic board?

Yes, I am in the US; in Arizona. If you are offering help or parts for loan or purchase, perhaps you will direct message me. Thanks

I do not have an ADB keyboard. I will use a wombat adb-usb adapter if I can get this power mac running. I have not cards installed other than the CPU. I have installed individual DIMMs, pairs of DIMMS, and 3 pairs of DIMMS in all combinations using paired slots specified in the user's manual...

Thanks for the response. Short Circuit, Turning into a resistor, Electrically leaky, passing DC instead of blocking are different degrees of the same thing. If they were significant enough to affect performance, a voltage droop at the capacitors' positive terminals would be measurable: no...

I re-capped to top of the logic board; I forgot to count the caps on the bottom. I can order the remaining needed caps, but I'd like to verify their performance in circuit first. I believe that the failure mode of aluminum electrolytic caps is shorting (or high current leakage). That would...

Update: no joy! I have now tried all logical combinations of two logic boards, two cpu cards, two power supplies (one of them is an ATX PSU with adapters) and three pairs of RAM modules. Either I am still missing something, or I was sold bad components that were represented as being...

Thank you for the offer. I already have a processor card coming from an ebay purchase that I made. I briefly worked in Mississauga (at Honeywell).

Thanks for the reply. That's what I thought but wanted to verify.

Thanks for the answer. Though I have a replacement processor card coming, I was hoping to do additional troubleshooting without it. I'm not getting a chime on power up. I was trying to determine what is needed to get the chime only. If replacing the processor card does not fix the problem...

While I'm waiting for a replacement/upgrade processor card, I want to continue with troubleshooting. I am not getting a chime on power up. Obviously to get the chime, I need a speaker, the logic board, and a power supply. I'm guessing also a processor card is required. Do I need RAM and/or...

Thank you for that answer and information. Right now, I'm replacing all aluminum electrolytic caps on the logic and processor boards. If that doesn't fix my power mac, I will try that replacement processor card (820-0780-A).

I own a power mac 7500/100 that seems to have a bad processor card. If I am to replace this card, I'd like to upgrade at the same time. On ebay, I have found an Apple Macintosh Mac 820-0780-A G3/G4 Computer Processor Card. Is this card compatible with my power mac?