From: "Greg Shafritz" <[EMAIL PROTECTED]> Date: Wed, 15 Oct 2003 05:55:27 -0400
What are the most common issues that could make a NuBus card "DOA"? I recently received an FWB SCSI Jackhammer that does not show up in Apple System Profiler, and Tattle Tech also cannot detect the presence of the card when installed. Essentialy, this therefore is a "dead" card.
What are the first things I should look for in trying to repair this card? I assume that I should first check to be sure that it is receiving power from the motherboard - true? Do these cards sometimes have onboard power supplies that fail? What about blown microfuses (what would a fuse look like that wasn't a conventional fuse) - is there such a thing as an SMD fuse?
I don't know much about general procedure, but I know I had a dead JackHammer that had a bad inductor. There are two of them near the bottom edge of the card between the front (front of the computer) end of the card and the NuBus connector. I was lucky enough to know that it may have been subjected to physical damage, which is how I found that problem.
Anyway, the inductors are easy to check, since the should appear as a short to DC current, so it's worth testing them. You might also check the voltage on the voltage regulator. However, I'm not sure what it should be set to output, so do a reality check on it. You'll need to find a spec sheet on it so you'll know which pin is input and which is output.
I've got another Jackhammer which is dead and I haven't been able to find the problem.
Jeff Walther
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