manroland R306 CMOS battery

Need help. I want to change CMOS battery on a R306. When we shut down the press and restart the press date changes to 01-01-1980.
Can somebody please help with the procedure?

 

Hi sir;

If you want to change the CMOS battery, you must 1) have the same typpe of battery, NOT generic battery. 2) you have normally 20 minutes for replace the battery. 3) use Wrist strap to avoid Electrostatic Discharge from the body to the CMOS IC . 3) Use electronic cleaner contacts for the terminals of battery.

 

What year was the machine manufactured? Only last have a battery. The first are with the Dallas chip.