Service Manual

GSM-205-523
Replacing a circuit breaker module (CBM)
31st Oct 01
Maintenance Information: Horizon macro indoor
68P02902W09-B
CONTROLLED INTRODUCTION
Maint. 2–13
Replacing a circuit breaker module (CBM)
Preconditions
for CBM
replacement
The CBM controls power for the whole of the cabinet, apart from the PSMs.
Consequently, the replacement of a CBM can only take place after the cabinet
has been taken out of service and isolated, in agreement with the OMC-R.
Views of CBM
Figure 2-6 shows views of the CBM with circuit breaker buttons identified.
FRONT VIEW
ig.281.rh
6 CTUs (0 TO 5)
12 A2 A4 A 7 A
BACKPLANE CONNECTOR
M4 MODULE ATTACHMENT
SCREWS
CCB (0 AND 1) SURF FANS BPSMs (A AND B)
7 A
HANDLE-BAFFLE
Figure 2-6 Views of CBM with circuit breaker buttons identified