User Manual

ADCP-75-126 • Issue B • April 2002 • Section 5: Maintenance
Page 5-17
© 2002, ADC Telecommunications, Inc.
12. Place the HU On/Off switch in the ON position (press I).
13. Verify that the fans run properly following power-up.
14. Notify the NOC or alarm monitoring system operator that the system is going back online.
5.4 Spectrum Transport Module Fan Replacement Procedure
The STM is equipped with a rear cooling fan that exhausts heated air from the STM enclosure.
Cool air enters the STM through vent openings on the side of the enclosure. Replacement of the
fan requires that the STM be turned off for a short period of time and that the STM be removed
from the cabinet. Use the following procedure to remove and replace the STM cooling fan.
1. Before working on the STM or handling a fan, slip on an Electro-Static Discharge (ESD)
wrist strap and connect the ground wire to an earth ground source. Wear the ESD wrist
strap while completing each section of the fan installation procedure.
2. Notify the NOC or alarm monitoring system operator that the system is going offline.
3. Place the STM On/Off switch in the OFF position (press O).
4. Disconnect the various power, fiber optic, service, alarm wiring, and coaxial cable
connectors from the STM front panel as specified in Figure 5-4.
Figure 5-4. Spectrum Transport Module Cable Connections
Warning: Electronic components can be damaged by static electrical discharge. To prevent
ESD damage, always wear an ESD wrist strap when working on the HU, STM, or LPA and
when handling electronic components.
17550-A
Disconnect AC
power connector
Disconnect back-up battery
DC power connector
Disconnect alarm
connector
Disconnect diversity
antenna connector
(if present)
Disconnect antenna
connector
1
2
3
4
5
6
7
Disconnect optical fiber
connectors. Place a dust
cap over each cable
connector and port adapter.
Disconnect service
connector (if present)