ACR350 Validator with QR Code Scanner
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User Manual
Version 1.02
www.acs.com.hk
Page 37 of 61
2.8. Replacing the Backup Battery
The backup power uses a CR2450 coin cell. This coin cell battery is shared between the RTC of main
MCU and the ACM350-PCD PCI SRED module. The security features and secure memory of
ACM350-PCD is powered by the CR2450.
To replace the CR2450 coin cell:
1. Open the 4G cover by unscrewing the 4 screws:
2. The CR2450 coin cell can be seen. Carefully remove the coin cell with tool and replace with
new coin cell.
Note
: If ACM350-PCD security feature is enabled, the coin cell has to be replaced in short
time, otherwise, tampering of ACM350-PCD will be triggered and all the keys will be erased.