Service Manual

GSM-204-523
Replacing the outdoor power supply module (TOPSM)
31st Oct 01
Maintenance Information: Horizon macro outdoor
68P02902W04-A
CONTROLLED INTRODUCTION
Maint. 3–17
Replacing the outdoor power supply module (TOPSM)
TOPSM
replacement
This procedure describes how to remove and replace a TOPSM in an
Horizon
macro outdoor cabinet.
Up to three TOPSMs can be located in the PSU cage in the power supply
enclosure half of the cabinet.
WARNING
Potentially lethal voltages, up to 415 V ac, and other high
energy sources are present within the cabinet when the ac
supply disconnect switch is set to the ON position and/or
batteries are connected.
Replacing an TOPSM does not require the removal of power, however it is
advisable to perform this procedure during periods of low traffic, as available
power is reduced.
Notify the OMC-R of imminent repair activity.
View of TOPSM
Figure 3-8 shows a view of the TOPSM.
Figure 3-8 The outdoor power supply module (TOPSM)