Service Manual

GSM-204-523
Replacing the outdoor power supply module (TOPSM)
31st Oct 01
Maint. 3–18
Maintenance Information: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W04-A
Replacing a
TOPSM
To remove a TOPSM
1. Switch OFF the appropriate circuit breaker for the TOPSM being replaced
(TOPSM 0 to TOPSM 2) on the number 2 ac distribution box.
2. Unscrew the two M6 captive fasteners that secure the TOPSM to the PSU
cage.
CAUTION
Handle the TOPSM with care; the unit weighs 4.6 kg.
3. Slide the TOPSM out of the PSU cage, supporting it from beneath with the
other hand as it emerges. Place it securely to one side.
The procedure for removing the TOPSM is now complete.
To install a replacement TOPSM
1. Repeat the removal procedure in reverse order.
2. Ensure that the TOPSM is pushed fully home into its connector on the
backplane before tightening the two M6 screws. Tighten to a torque of 3.4
Nm.
3. Switch on the circuit breaker for the TOPSM.
4. Check the operation of the TOPSM LEDs, as described in
Installation
and Configuration, Category 423.
The procedure for replacing the TOPSM is now complete.
Notify the OMC-R of base station availability and log the maintenance activity.