11/45-1, Jay-0

From: Tom Uban <uban_at_ubanproductions.com>
Date: Fri Feb 18 07:32:23 2005

Jay -- your next step is to make sure the ACLO and DCLO signals on the
unibus are not asserted. If they are, then the processor will be dead
in the water. My experience is that at least one of these signals is
generated on the PS board inside of the H742.

--tom

At 09:03 PM 2/17/2005 -0600, you wrote:

>Checked out my supplies and powered up. Sometimes the processor comes up
>"pause", sometimes no status light. I checked the light test and many
>lights are burned out. It doesn't seem to retain any values I store in
>memory, and "addresses error" was a frequent visitor. It's very possible
>I'm not operating the panel correctly, it's a bit different than what I'm
>used to.
>
>Just out of curiosity, I'm wondering about checking the voltages of the
>regulators at the backplane. I found the charts to decipher the pin
>references, I believe the first pin called out to check for +5 was A02A2.
>I can find that pin, but where exactly is the ground reference for that? I
>checked the voltages at the regulators instead, but was just curious for
>future reference. All the grounds appear to go to the backplane traces
>from the mate & locks so there's no obvious lead going to a pin on the
>backplane.
>
>I'm not completely sure where to head next - I feel completely uneducated
>enough to know what to look at, so I'm going to just plow through more
>manuals. My initial suspicion is something with the core setup, I wonder
>if the MF11-L assigns address space based on slot or on jumpers. I tried
>swapping boards (sorry Tony!) in the core section and the problem didn't
>seem to change at all. It's sucessive presses of DEP supposed to
>automatically increment the address? Not sure it's doing that.
>
>So, my hope that it would just "work" is gone. Let the fun begin :)
>
>Jay
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Received on Fri Feb 18 2005 - 07:32:23 GMT