Service Manual

GSM-205-523
12-monthly maintenance procedures
31st Oct 01
Maint. 1–6
Maintenance Information: Horizon macro indoor
CONTROLLED INTRODUCTION
68P02902W09-B
12-monthly maintenance procedures
Summary of
12-monthly
procedures
The 12-monthly maintenance procedures involve the following:
 6-monthly procedures.
 Checking and cleaning fans.
 Checking normal operation.
 Annual check of the installation.
WARNING Potentially lethal voltages and high energy sources are
present in the cabinet when the ac mains 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.
Checking and
cleaning fans
CAUTION If the cabinet is operational, this maintenance procedure
should be completed without delay, in order to minimize
duration of air cooling disruption.
There are three cabinet fan modules, one 4-fan unit and two identical 2-fan
units. Table 1-2 shows the three fan positions.
Table 1-2 Fan positions
Fan
reference
Type of module Cabinet position
0 4-fan unit Right side, beneath digital cage.
1 2-fan unit Middle, beneath CTUs.
2 2-fan unit Left side, beneath CTUs.
The fans can be checked and cleaned by the following procedure:
 Remove the fan module by lifting the central slide latch and pulling out.
 Use a brush and vacuum cleaner to remove any dust and dirt on the
module.
 Refit fan and check operation. Any fan not operating should be started by
using the appropriate RESET button.
 Observe the fans through the grilles to ensure correct operation. Listen for
excessive noise. If there is excessive noise, identify fan and replace fan
module (see
Maintenance Information: GSM-205-523 Replacing a fan
module.