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HP 54503A scope, address error
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iblackford:
Hi All,

I have recently acquired an HP 54503A 500Mhz scope. I thought this scope had the standard NVRAM issue, so I replaced it, however the problem still exists.

I've attached the picture of this error...I can't find anything in the service manual to isolate this error. Any ideas?

Thanks, Ivan

iblackford:
I should add that I _did_ try numerous attempts at holding down a button on startup to attempt a calibration, and nothing was working. I also made sure that the calibration switch was set to unprotected while attempting a calibration.

Could this be a ROM/RAM issue? does anyone know where I can find firmware dumps for this or similar models? Schematics?
nctnico:
I'd start here. Looks like the 54501A model is related so likely many, if not all information applies to your oscilloscope as well. HP / Agilent has a habit of basing various oscilloscope models on the same hardware platform with only the last digits of the model number being different.

http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=HP_Agilent
Miek:

--- Quote from: iblackford on November 10, 2022, 01:44:19 pm ---Could this be a ROM/RAM issue? does anyone know where I can find firmware dumps for this or similar models? Schematics?

--- End quote ---

The "Address Error" a low-level processor exception meaning that the firmware tried to access memory at an odd-numbered address. I would expect the only cause of that to be some corruption happening somewhere, so yeah, I'd suspect bad ROM or RAM.
iblackford:
Cool...thanks, that's what I thought it might be.

I'm curious, how did you know that it was an odd address? Is there any further debug information that I can glean from the various numbers on the screen?

Thanks, Ivan
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