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Re: HP54603B Software Gremlins

 

Hi Andreas,

There is two different Non-volatile/zero-power ram chips in the module.
Both have their own internal backup battery. So the battery in one of them is probably bad.

I would replace both, as the other one probably don't have much time left.

From the manual:
Saving Traces Hint
"For traces 1 to 3, the trace is saved in the non-compressed state. For traces
greater than 3, the trace is saved in 64 Kbytes of nonvolatile trace memory with
data compression. After a compressed trace is saved, the available area (in
percent) is displayed."

In my 54657A, there is one Dallas DS1244Y-120 (32kbytes) and a ST M48Z128Y-120PM1 (128kbytes). see picture.

So I would guess that its the ST part in yours that the battery is bad.

BR,
Askild



On Thu, Apr 9, 2020 at 12:00 PM Andreas Zilker via <dg7rbn=[email protected]> wrote:
Hi Matthew,
the self test menue has an explicit function that tests RAM and it runs thru without error messages.
The problems seem to occur in the nonvolatile memory of the HP54657A module. The clobbered screen display vaguely shows the original image tilted to one side. It looks more like a classical programmer's bug (wrong increments of an adress pointer while copying data).
Regards????????????? Andreas

20180525_173242_r.jpg

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