Service Manual

GSM-205-523
Replacing a cabinet heat sensor
31st Oct 01
Maintenance Information: Horizon macro indoor
68P02902W09-B
CONTROLLED INTRODUCTION
Maint. 2–7
Replacing a cabinet heat sensor
Overview of
heat sensors
Heat sensors plug into the backplane from the front above the CTUs. Each one
can be separately detached, and a replacement inserted. CTUs are removed to
gain access for this procedure.
There is one 70 C sensor and two 85 C sensors. Each sensor is marked with
the appropriate temperature.
Procedure for
heat sensor
replacement
To replace heat sensors:
WARNING
Before disconnecting RF cables, ensure that the RF
power is OFF by turning cabinet PSMs off. If RF power is
ON when cables are disconnected, severe burns may
result.
1. Remove the CTUs (see Replacing a CTU).
2. Identify the faulty heat sensor.
3. Remove the faulty heat sensor by pulling.
4. Install the replacement heat sensor by pushing firmly into place.
5. Install the CTUs (see Replacing a CTU).
The heat sensors should now be operational.