how can i fix my sam 4s er-52oom?

BATTERY change date will be on the serial number plate eg BATT NEXT APR 12.

This till has a small battery that needs changing every couple of years, or if left switched off in colder weather will fail losing your program in weeks. For saftey a dealer will need to solder on correct rating battery (genuine).

till guy
December 2015

That is usually a full loss of program. You probably need to have the battery changed by a dealer and the machine reprogrammed

Registerman
October 2015