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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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AJ3G:
Hello:

I am not sure if you are the same person, but I spoke to someone on the HP board regarding an almost identical problem. I too had the error you speak of, and it was resolved by replacing the HDD. I pulled the old mechanical drive for a solid state drive.

Your next step seems like a good one. I had a SRAM fault, which was intermittent. It seemed to work fine for about 1/2 hour and then the display would go on the fritz, followed by the SRAM error and some really weird relay contact counts. I finally took the scope completely apart, cleaned all the connectors, and card edges, and the the scope is functioning again. I have had it running now for three days without issue, so I hope the issue is corrosion on one of the connectors.

These scopes seem to be a bit finicky. I hope this helps..

Rich
analogRF:
yes I am the same person  :D
but if you read my posts, I have already gone through all those things more than once...
playing around with RAM sticks and their place, using multiple known good hard drives and flash card drive, cleaning all boards and connectors 2-3 times....but what the hell, i;ll do that again  |O
nctnico:
Maybe the CPU got bad. Does the heatsink fit properly?
analogRF:

--- Quote from: nctnico on November 26, 2019, 03:01:30 pm ---Maybe the CPU got bad. Does the heatsink fit properly?

--- End quote ---

the cpu is stuck to its fan as you may have noticed yourself since you had the same model, and yes it fits properly. it is barely warm...
why would the cpu die on its own sitting in the corner? besides i would imagine the bios would complain if the cpu was bad...
during capacitor replacements I took it out just to be safe.
AJ3G:
That is annoying. It would seem to me if the final attempt at cleaning does not resolve the issue, the Motherboard maybe malfunctioning and need to be replaced. Not great news, but not the end of the world either.
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