HP 54501A oscilloscope problem. Please help me!

[Gabriele]

Hello to everybody! Please help me!


I've bought an HP 54501A 100MHz digitizing oscilloscope, but it doesn't
work!

It seems to have a problem on the NON-VOLATILE RAM, so it doesn't pass the
self-tests.

Performing all the self-tests it gives 3 fails:

FAILED Protected non-volatile RAM TEST - 0000 0000 0000 0001
FAILED A/D TEST - 0000 0000 0111 1111
FAILED D/A TEST - 0000 0000 0000 1000

I think A/D and D/A fails depends on first fail, becouse CPU stores the
calibration information in this memory (this information comes from the
manuals).

Moreover, if I perform the self-calibration procedure (UTIL -> SERVICE
MENU -> CAL SELECT 3 -> START CAL), I obtain "cal ram write protected", even
if the rear calibration switch is set to UNPROTECTED mode.


Please help me! I'm looking for any information, particularly the
SCHEMATICS, the RAM position on the mainboard, the meaning of the previous
numbers, internet links, emails of
service centers, and so on...

Thank you,
Gabriele (Florence, Italy).

 

[John Fields]

On Mon, 15 Nov 2004 19:36:29 GMT, "Gabriele"
<CANCELmwicLAMI@freemail.it> wrote:

Hello to everybody! Please help me!


I've bought an HP 54501A 100MHz digitizing oscilloscope, but it doesn't
work!

It seems to have a problem on the NON-VOLATILE RAM, so it doesn't pass the
self-tests.

Performing all the self-tests it gives 3 fails:

FAILED Protected non-volatile RAM TEST - 0000 0000 0000 0001
FAILED A/D TEST - 0000 0000 0111 1111
FAILED D/A TEST - 0000 0000 0000 1000

I think A/D and D/A fails depends on first fail, becouse CPU stores the
calibration information in this memory (this information comes from the
manuals).

Moreover, if I perform the self-calibration procedure (UTIL -> SERVICE
MENU -> CAL SELECT 3 -> START CAL), I obtain "cal ram write protected", even
if the rear calibration switch is set to UNPROTECTED mode.


Please help me! I'm looking for any information, particularly the
SCHEMATICS, the RAM position on the mainboard, the meaning of the previous
numbers, internet links, emails of
service centers, and so on...

---
I had some problems with an HP54602, and even though they don't
officially support it any more, I went to http://www.agilent.com ,
searched around for everything I could find, and eventually wound up
calling their tech support folks who were helpful to the point that it
seemed like I had just bought a brand new scope. Check it out, and
good luck.

By the way, as far as I know they still repair and cal their old
stuff, so if it gets down to that at least you have a place to go...

--
John Fields