The two CPU boards I have don't behave the same. Lets call them A and B. When A is in slot CPU0, we consistently get SYSTEM RESET displayed on the Operator Console Panel (but no other signs of booting). When B is in slot CPU0, we get nothing shown on the OCP (and no other signs of booting). This is the same behaviour when A or B is in slot CPU1 and CPU0 is left empty. In both cases, the above behaviour is the same if slot CPU1 is also populated or empty.
Can we conclude that one of A or B is broken? I've cleaned the contacts of both boards (and the memory, and the IO board) with Isopropyl alcohol, but haven't see any changes in behaviour.
Both CPUs get warm when connected in either slot, so they're both alive to some degree.
I also started work on removing some of the rust from the cabinet.
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| A really rusty rear. |
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| Rusty brown is this year's black, apparently. |
I removed the divider tray from the main compartment and scrubbed it clean of rust. Here's the backplate board unobstructed.
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| Backplate: 54-23149-01 |
I'm also managing to power up successfully every time now, by switching off PSU #1 and leaving PSU #2 to do all the work (with jumper J3 enabled).
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