Product Info

P ower Supply Modules (PSMs) Chapter 10: PSM Shelf R eplacement Procedures
Prerequisites
Before you begin
Before you begin, record the pertinent information in T able 10 -6 .
Table 10 -6 Item number replacement list
Item
Number
BTS number
F ailed –48 V DC PSM number
F ailed 220 V AC PSM number
PSM replacement procedure
The PSM weighs appro ximately 5 kg. Be careful when handling the PSM to prev ent
damage to the equipment and personal injury .
W earing anti–static wrist str aps during this procedure is not recommended.
Occasionally during this procedure, touch the fr ame ground to dissipate static
electricit y .
P erform the steps described in Procedure 10 -5 to replace either a –48 V DC PSM or a 220 V
AC PSM.
Procedure 10 -5 R eplacing a PSM
1
Notify the OMC–R operator that you are replacing the -48 V DC/220 V AC PSM.
2
It will be helpful if the OMC–R operator executes “ENABLE EVENTS” command at the CLI
session of the OMC–R to monitor alarms. This command is optional and may not be useful if
executed during a high CP U utilization time.
3
Using a T25 TORX bit and driver , loosen the captive retaining thumbscrew until it is
disengaged from the shelf .
Continued
10 -24 68P09283A64 -3
FOA SEP 2007