ADC Telecommunications Inc. DLC1904B Benutzerhandbuch
ADCP-75-126 • Issue B • April 2002 • Section 5: Maintenance
Page 5-19
©
2002, ADC Telecommunications, Inc.
Figure 5-6. Removing STM Fan From Mounting Plate and Grill
14. Re-install
the STM in the cabinet and then re-connect all cables in the reverse order in
which
they were disconnected (see
15. Place
the STM On/Off switch in the ON position (press I).
16. Verify
that the fan runs properly following power-up.
17. Notify
the NOC or alarm monitoring system operator that the system is going back online.
5.5
Linear Power Amplifier Fan Replacement Procedure
The
LPA is equipped with both a front and rear cooling fan. The front fan draws cool air into the
LPA
enclosure and the rear fan exhausts heated air from the LPA enclosure. Replacement of the
fans
requires that the STM be turned off for a short period of time and that the LPA be removed
from
the cabinet. Use the following procedure to remove and replace the LPA cooling fans.
1. Before
working on the LPA 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. Loosen
the captive screws that secure the LPA to the RU cabinet mounting shelf and
carefully
withdraw the LPA from the cabinet.
5. Pull
out the four retainers that secure the front fan to the LPA as shown in
and
same
for reuse.
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.
16993-A