What is the voltage on pin 28 of the two socketed rams on the timing and control board in the bottom of the unit?
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On 3/15/2019 4:07 PM, Reginald Beardsley via Groups.Io wrote:
My 11801 arrived today. On power up it makes two beeps and puts up two lines of text on the screen:
Diagnostics in progress
Comm Test in progress
But does not go past that. The seller sent a picture showing an E5622 error, "passed" below that and ???? for the timebase, main acq, mcu a-d acq entries and a picture of the screen with "Self test in progress".
I have reseated all the boards and cables behind the CRT and the cables on the display board. The display board was missing the 4 corner screws. I have replaced those.
So does anyone recognize the issue? While I was pulling the boards I checked the 4 lithium cells and all were over 3 V despite 1988 date codes. That did not match the service manual for the 11801C which is a little disturbing. Is this really just a CSA803 with 4 extra ADC channels? Does anyone know of a manual for this unit? I think all the ROMs are marked 1989, but was not meticulous about that detail as I expected reseating the connectors to have an effect.
Thanks,
Reg
