Standard operating procedure for replacing a Lithium cell whilst maintaining power to the SRAM...
1. Buy a 2 cell AA or AAA battery holder with flying lead output for connection to a PCB.
2. Fit 2 cells in the holder
3. Solder the flying leads to the supply rails that the Lithium battery maintains (observing polarity)
4. Cut the lithium battery off of the PCB
5. Desolder the lithium battery pins
6. Insert the new Lithium battery and solder its pins.
7. Desolder the battery holder flying leads.
8. Job done
Note this is all done with the power to the equipment OFF !
For the very nervous amongst you, you can usually insert a 1K resistor in series with the battery holder flying leads, though this is not normally needed in the real world.
This approach came from an OEM service manual and is not some 'hack' method
Aurora
Doesn't this require a floating soldering iron? I don't think touching an ESD-safe tip to a powered rail is a great idea...
!! I want specify better these procedure: if you change the lithium battery and you have installed the option TG (Traking Generator),
you will lost all the additional firmware for the TG and the
TG will stop to work and a error message it will appear on the display.
If someone have this problem, I have all the firmware needed to re-load again with the floppy disc, and all the procedure and password needed to load the TG firmware again. !!
I hope this can solve the problems "if" the battery it's sudden dead, otherwise if you not want losing the firmware for the TG, connect the new one battery in parallel to the old one, and after you will remove the old one.
I hope this can help someone with trouble...
Ciao