[volt-nuts] HP3468A
Neil Gruending
neil at gruending.net
Sun Aug 28 05:34:22 UTC 2011
Bad power supply?
On Sat, Aug 27, 2011 at 8:48 PM, Bob Smither <smither at c-c-i.com> wrote:
> Dear All,
>
> Not sure where else to ask this question - I am hoping that a fellow
> volt-nut has experience with the 3468A.
>
> I have an EBay special, known bad when I got it, HP3468A. When powered on
> it simply cycles through what looks like a test (all / most elements of the
> lcd display turn on) and an Overload indication.
>
> I have followed the repair manual as far as I can, but since the unit never
> stabilizes - the processor is continually interrupted and the cycle repeats
> - I have not really found anything.
>
> The 3468A uses a 3 volt battery backed up RAM. The 3 volt lithium cell
> reads ~ 1.5 volts so clearly the RAM contents are gone.
>
> Could there be something in the RAM that when not present forces the
> processor to reset?
>
> If it is possible that the missing RAM information is causing the continuous
> run / rest cycle, any idea how I could I restore the RAM contents?
>
> Thanks for any pointers!
>
> Best regards,
> --
> Bob Smither, Ph.D. smither at c-c-i.com
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