Service Manual

GSM-204-523
Replacing a power supply module (PSM)
31st Oct 01
Maint. 3–20
Maintenance Information: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W04-A
Replacing a
non-redundant
PSM
The following procedure should be followed if only two PSMs are fitted in the
cabinet:
CAUTION
Only –48/60 V dc PSMs can be used in Horizon macro
outdoor cabinets. Ensure that the replacement PSM is of
the appropriate type (kit number SVPN1221).
1. Verify that the switch of the replacement PSM is set to output disable.
2. Remove the blanking assembly of the spare slot, by unscrewing the
attachment screws using an M4 Torx driver.
3. Insert the replacement PSM in spare slot.
4. Ensure the replacement PSM is firmly in position and tighten both module
attachment screws using the M4 Torx driver. Tighten to correct torque (see
Overview of FRU replacement procedures in this chapter).
5. Set the switch to OUTPUT ENABLE. Check that the green LED (ACTIVE)
is lit.
6. Set the switch on the faulty PSM to OUTPUT DISABLE. The green
ACTIVE LED will go off (the green light may already be off if PSM failure
has resulted in output failure of that PSM). The red LED, if already ON due
to alarm state, will stay ON.
7. Undo the module attachment screws using the M4 Torx driver, and remove
the module. The red LED will go OFF.
8. Fit the cover plate by tightening the attachment screws using the M4 Torx
driver. Tighten to correct torque as stated in step 4.