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Forum: Troubleshooting 07-11-2007, 05:47 AM
Replies: 15
Views: 43,462
Posted By phe
Problem Solved!!! There was a manufacturing...

Problem Solved!!!

There was a manufacturing defect :eek: in the board and two traces were shorted. A bit of work with an exacto knife and I was able to remove the copper bridge between the traces....
Forum: Troubleshooting 07-11-2007, 12:55 AM
Replies: 15
Views: 43,462
Posted By phe
Marty and Grant, here is what I see (with the CPU...

Marty and Grant, here is what I see (with the CPU and memory cards removed):

With the system turned on, IC W pin 1 is HIGH; pin 3 is HIGH; pin 2 is LOW; pin 4 is LOW. These are observed with the...
Forum: Troubleshooting 07-09-2007, 01:02 AM
Replies: 15
Views: 43,462
Posted By phe
Thanks for the helpful reply, Marty. I pulled the...

Thanks for the helpful reply, Marty. I pulled the switch out. The switch is OK. The problem must be in the circuit. I've been visually inspecting for solder bridges and have not seen any. I pulled...
Forum: Troubleshooting 07-07-2007, 03:12 AM
Replies: 15
Views: 43,462
Posted By phe
debugging the protect circuit

I'm trying to figure out why the flip flop in IC L on the memory board is not changing state. I've checked the voltage on lines 20 and 70 of the bus when I flip the switch to protect and unprotect....
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