[volt-nuts] Datron 1281 NVRAM woes

[Todd Micallef]

Bert,

I did a test not that long ago for another volt-nut by disconnecting the
cable between the digital and DCV boards. I got the following error:
"9005.9 Pon tru/compl  00173A".

One of mine came with a 9005.7 00150C error and it turned out to be a
disconnected cable on one of the option boards (resistance?). Most likely
not your problem but it could indicate one of the option boards is not
responding. I could try and make some time disconnecting each of the boards
and reporting back their errors. It could narrow down your problem. Let me
know, and I will clear some bench space after work.

Also, another member had issues that were resolved by changing the EPROMs.
Let me know which version you have. The same version may be archived on
xDevs. If you have a programmer, you can verify your checksums against the
archived copy.

Agree with acbern on borked cals. A new cal and SRAM may be in your future
if you can get the other error cleared.


Todd




On Tue, Apr 12, 2016 at 3:20 AM, Bert K <bkachler at hotmail.com> wrote:

> Hello,
>
> all of a sudden my beloved Datron 1281 stopped working.
> If briefly displays the familiar
> "DCV: Auto 100mV......"
> but then
> "Secondary NV C/SUM ERROR 2101"
> and then
> "9005.7 No Rtx    001B42"
>
> The voltages from the DC board PS seem okay, also the
> battery displays only a bit less than 3.7Vol.
>
> Obviously I wonder whether anything can be done here.
> In particular I wonder about the NVRAM setup,
> namely whether "Secondary" could be just a safety copy
> of the "Primary". Or whether this is the less important
> set of self-cal constants, etc.
> I couldn't find any info in the various manuals.
>
>
> Also the second error seems to have to do with
> serial comm, and it is not evident that is has anything
> to do with with the first error. If not, then they could have
> a common underlying reason, like a faulty PS.
>
> The PS of the digital board is different than as the one
> described in the manual, so I can't really check the voltages
> meaningfully. Does anybode have schematics of this
> second (I hear common) type of digital board?
> Or knows otherwise what the voltages on the various
> test points are supposed to be?
>
> Thanks,
> Bert
>
>
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