On Mar 1, 2025, at 18:00 , Adam R. Maxwell via groups.io <amaxwell@...> wrote:
The garbage cleared off the display at some point, but after multiple power cycles, it will occasionally show a dot that can be repositioned vertically, so I assume CRT is good.
The garbage is back. Some idiot had bent a pin while plugging one of the storage boards back in. Photo here; there is a dot moving very slowly across the horizontal line, and the line can be moved up and down with a pot on the front panel.
/g/TekScopes/photo/301031/3891788?p=Name%2C%2C%2C20%2C1%2C0%2C0The processor board "ROM 17" LED stays on after powerup, which might be a clue but I can't find a description of it in the manual.
Labeled ROM 17 on the board, but DS1044 on the board diagram, and that LED is referred to as "ROM 8" in the manual:
"Step 1. At power-up, the microcomputer vectors to the self-test in the ROM at the top of address space U2028 on the Memory board. The microcomputer first verifies the checksum of U2028. If the routine for this step runs, but doesn't obtain the correct checksum for the ROM, the routine halts and blinks the ROM 8 LED, DS1044."
DS1044 is steady, not blinking, so I'm still confused.
thanks,
Adam
