Siemens Maxum II Reference Manual page 49

Replacing A CAC3
The CAC3 memory content depends on backup-battery voltage from the SIB3. When the CAC3
is removed from the SIB3, the memory content is lost. Observe safe ESD handling procedures.
1. Disconnect the ethernet cable from the CAC3 board.
2. Remove the two 2mm screws and o-rings as shown in the illustration below. Early SIB3s
had threaded studs, with two nuts with o-rings.
3. Remove the CAC3 by gently pulling it straight up. Avoid rocking or tilting motions.
Maxum II Reference Manual
Manual, 7/2017, 2000596-001
Electronic Compartment Component Descriptions and Maintenance Procedures
2.3 System Controller Version 2.1 (SYSCON2.1)
49