Service Manual

GSM-204-523
Overview of FRU replacement procedures
31st Oct 01
Maintenance Information: Horizon macro outdoor
68P02902W04-A
CONTROLLED INTRODUCTION
Maint. 3–1
Overview of FRU replacement procedures
Field
replaceable
units (FRUs)
WARNING Maintenance procedures on this equipment must only be
carried out by suitably qualified personnel.
This chapter provides information on replacement of Field Replaceable Units
(FRUs). Only components classed as FRUs are described in this chapter.
Any requirement to open or close a door, a lid, or remove/refit a TMS front cover
is assumed in procedures. Shutting the door, or the lid is assumed at the end of
any procedure. Detailed descriptions of cabinet access procedures are given in
Maintenance support procedures.
Where customers wish to perform a minor repair on an FRU, in order to save the
cost of full replacement, they should consult Motorola for more detailed
procedures or replacement components (see Additional replacement parts).
FRU list
The following is a list of FRUs used in this equipment:
 Door.
 Lid.
 Environmental seals.
 TMS unit.
 TMS fans.
 TMS control board.
 Main cage temperature sensors.
 DC circuit breaker panel.
 Control and alarm board (CAB).
 The outdoor power supply modules (TOPSMs).
 Power supply module (PSM).
 Circuit breaker module (CBM).
 Internal battery tray.
 CTUs.
 SURF module.
 Tx blocks including feedthrough plate.
 Krone blocks.
 Digital modules (MCUFs, NIUs, FMUXs, alarm board and also BPSMs).