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HP8591C backup parts or schematic

Question asked by johnbosch on Jan 22, 2012
Latest reply on Jan 23, 2012 by MikeM
Hello All,

I have purchased an HP8591C, this was an broken analyser, but all is repaired so far.
Except the DLP memory is not working propely.
The backup is not working, already replaced backup cel CR2450 and the CAP.
I noticed that someone else tried to repair this board also, therefore I need to know wich IC U3 is.
I have a manual but that is not coresponding to my board.
The board I have is 08590-60367-01

So any information about U3 or a schematic wil help.