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?
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?
There is no easy way out. I don't know if hacking the board you are mentioning is a whole lot easier than finding and replacing the chip. Having said that: Agilent does not support this or any procedure for the "54645D - best way to replace NVRAM battery?" case. Sorry about that.
edgardog