Service Manual

GSM-204-523
Replacing TMS unit components
31st Oct 01
Maintenance Information: Horizon macro outdoor
68P02902W04-A
CONTROLLED INTRODUCTION
Maint. 3–11
Replacing TMS unit components
Introduction to
TMS unit
component
replacement
The following TMS unit internal components can be replaced as FRUs:
 TMS fans.
 TMS control board.
 TMS gasket (only needs to be checked when replacing other TMS FRUs).
The information contained here assumes that the TMS unit has been removed
from the Horizon
macro outdoor cabinet, as previously described.
Replacing a
TMS fan
Each of the four fans in the TMS can be replaced as follows (refer to
Figure 3-5):
1. Remove the fan access panel by undoing the panel retaining screws using
a Torx screwdriver.
2. Gently lift off the access panel and partially withdraw the fan. (The fan is
bolted to the rear of the access panel.)
3. Unplug the floating connector and withdraw the fan assembly from the
TMS unit.
4. Place the fan assembly on a flat surface. Undo the four mounting plate
retaining bolts and remove the fan and mounting plate from the spacers
on the access panel.
5. Remove the fan from the mounting plate by undoing the four fan securing
bolts on the underside of the mounting plate.
Replacement is a reversal of the removal procedure.
FAN ACCESS PANEL
FAN MOUNTING PLATE
FAN
SPACER
POWER CONNECTOR
Figure 3-5 TMS fan assembly