Hello, my name is Michael. I can help you with your question. If the battery was changed when there wasn't power, or if something went wrong during the change, you may have lost your programming. You can still do a reset on the register. Just be aware that you may have to program it from the start again. Here are two ways to do the reset.
1) Unplug the AC cord from the wall outlet.
2) Set the MODE switch to the (SRV ) position.
3) Plug in the AC cord to the wall outlet.
4) While holding down JOURNAL FEED key, turn to (SRV) position
from (SRV ) position.
Procedure-2 (without SRV key)
1) Turn the mode switch to the (REG) position.
2) Ensure the batteries are not installed in the battery compartment
and insert the plug into the outlet.
3) The right most decimal point will blink for a few seconds.
4) The register will sound three beeps.
5) The register will display ; L 0000
It looks like the service manual says exactly, which now that I am looking at it, doesn't make sense. Try this - it should do the same thing:
1) Set the mode switch to PGM2 position.
2) Turn off the AC switch.
3) While holding down JOURNAL FEED key and RECEIPT FEED
key, turn on the AC switch
The memory may be corrupt. This procedure will do a full clear of all the memory. If you do this, you will have to program the register again, but this might be the only option.
2) Set the MODE switch to the (SRV′) position.
4) While holding down JOURNAL FEED key, turn to (SRV) position from (SRV′) position.
And I made sense of that last line.I wasn't thinking hard enough. What it means is to start with the key in the SRV position, then at number 4, just turn it to any other position.