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Scope help

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awwende:
So the story is, I'm working on a small class D tesla coil/plasma speaker and was working on testing my iphone isolation circuit, which will be using a fiber optic cable. As I was trying to measure an output my screen froze up and displayed an error code:

"Illegal Instruction: 3849F4H"

It's an HP 54600A 100MHz scope (bulky but I love the thing). I've searched google with no luck, and even though it's a copyright 1997 scope I even checked HPs website for technical support (out of desperation). I tried taking it apart to look for a CMOS battery since it displays even after I disconnect and reconnect power, but couldn't find the stupid thing.

Does anyone know what's wrong or how I can fix it?

Psi:
Dunno,
but here is the service manual with schematics
http://www.home.agilent.com/agilent/redirector.jspx?action=doc&lc=eng&cc=CA&id=1517712&ltype=External%20File

Have you looked over the pcb for anything obvious, like bulging capacitors?

w2aew:
Various manuals for the that scope can be found on this page:

http://128.238.9.201/~kurt/manuals/manuals/HP%20Agilent/

I took a brief look at the service manual there, and it didn't initially appear to provide much help with respect to any error codes.  In the Troubleshooting section, it describes a couple of built in self tests, and that if they fail, then replace the system board.  Not very helpful for doing a component level repair.  It does describe a little about checking out various systems, so maybe you'll be able to narrow it down...

awwende:
Yes, I've looked the board over for obvious problems but it all looks fine from what I can tell.

rf-loop:

--- Quote from: awwende on September 12, 2011, 02:00:21 am ---I tried taking it apart to look for a CMOS battery since it displays even after I disconnect and reconnect power, but couldn't find the stupid thing.

--- End quote ---

HP use (Dallas or equivelent ) NVRAM what includes inside Li batteries. You can not measure batt voltage.
I do not know this model NVRAM (I have not anymore these scopes) but I have fixed lot of 5450x series and this model keep cal data in NVRAM. But It can recovery just driving full selfcal routines after first defaulting cal data.

Only what I know about 54600 serie is that it have also NVRAM and typical battery life is (depending many factors) 10 - 20 years. It is HP designed lifetime limit for this product. ;)

If it tell in selfcheck nvram ok, it still do not know battery status.

But first, reset to decfalut (factory cal) and run full selfcal routines.

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