Service Manual

GSM-205-523
Overview of replacement procedures
31st Oct 01
Maintenance Information: Horizon macro indoor
68P02902W09-B
CONTROLLED INTRODUCTION
Maint. 2–1
Overview of replacement procedures
Field
Replaceable
Units (FRUs)
WARNING Potentially lethal voltages and high energy sources are
present in the cabinet when the external isolator switch is
set to the on position and/or batteries are connected.
Remove rings, watches and jewellery before starting these
procedures, and exercise extreme caution when working
on the equipment.
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 detailed in this chapter.
Any requirement to open or close a door, or remove and replace the optional
hood, is assumed in procedures. Shutting the door, or replacing the hood is
assumed at the end of any procedure. SURF module and Tx block replacement
may be carried out with the stacking bracket in place, but the CCB basket (if
fitted) must be removed, (see Replacing a CCB ). For door opening, or hood or
stacking bracket removal, see Routine maintenance overview.
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.
 Heat sensor modules.
 Hood.
 Stacking bracket.
 Fan units.
 Circuit breaker module (CBM).
 Power supply module (PSM).
 Hold-up battery module.
 CTU.
 Tx blocks, including feedthrough plate.
 SURF module.
 CCBs (installed in stacking bracket basket as CCB FRU).
 Digital modules (MCUFs, NIUs, FMUXs, alarm board and BPSMs).