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54645D - best way to replace NVRAM battery?

Question asked by iorlovich on Aug 5, 2008
Latest reply on Sep 3, 2008 by edgardog
I have an HP 54645D scope made in 1996 that reports calibration memory checkum failure after cold boot. It then loads defaults and seems to function ok. I am guessing the Lithium battery inside the ST M48Z18-100PCI chip is finally gone and things get lost when power goes away. What would you suggest as the best way to replace that battery?
The chip is a 28 pin DIP package, soldered into the system board, so that looks rather laborish to do. I am contemplating hacking together a small board with a lithium battery holder, backup supervisor/ideal diode chip and then connecting it in series with the power pin of the existing chip. Are there easier ways out?  

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