CIB_SR 3.3V Power Supply Not Present

What does PWR/3.3V Off (CIB_SR) mean?

The PWR/3.3V Green LED for the CIB_SR module is OFF, indicating a lack of 3.3V supply voltage to the module. This absence of critical operating voltage prevents the CIB_SR module from functioning correctly and could result in the non-operation of interconnected I/O nodes.

1. 1

   Check fuse F17.3 on the CCU_SR for continuity and proper rating.

2. 2

   Verify the presence and correct seating of jumper plug X308.

3. 3

   Check fuse F308 on the CCU_SR for continuity and proper rating.

4. 4

   If an external supply is used via X308, check the external power supply to ensure it provides the rated voltage of 24 V.