I wanted to instal battery socket on motherboard to save high scores. I soldered socket, blocking diode and installed new 3V battery CR2032.
On the next day when I turned on pinball display showed this:
(Missing digits are different issue, not involved)
Every score looks like that.
What I try:
- factory reset in bookkeeping (every statistic shows "8888")
- changing positions of dip switches
- desoldering socket and diode
- cleaning board
Nothing helped. In test mode I have "Memory - OK".
Did I damage Z5 RAM or it's something else?