User's Manual Part 3

Heat Management System – continued
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-77
PRELIMINARY
Table 9-43: Procedure to Remove HMS
Step Action
1 Notify operator that the HMS replacement procedure is starting and that alarms can be expected.
2 Turn off DC power to the TME.
3 Unlock and remove external lock
4 Use key to unlock HMS draw latch door.
5 Turn latches and slowly swing open HMS.
! CAUTION
Be aware of the heater elements, they will be hot to the touch if they have been in recent use.
Removing the HMS exposes the interior of the TME to the elements, cover the opening with a
blanket, towel, tarp, card board, or equivalent item.
6 Use an driver wrench with socket to remove two M6 nuts and washers securing ground lug to HMS
door. Disconnect DC power and HMS controller cable from HMS Controller.
7 Remove HMS and place on a flat surface, preferably a table of bench top.
! CAUTION
Be careful not to damage louvers protecting Blower Fan.
Install HMS
Follow the procedure in Table 9-44 to re–install the HMS.
Table 9-44: Procedure to Re–install HMS
Step Action
1 Carefully lift HMS and set on TME hinge pins.
2 Place ground lug on ground studs of the HMS and secure using two M6 nuts and washers. Torque nuts
to 3.4 N–M (30 in–lbs).
3 Connect DC Power and HMS controller cable to HMS Controller.
4 Close HMS be careful not to pinch any of the wiring.
5 Close HMS and secure using the two draw latches. Fold draw latch handles down. Verify that HMS is
fully closed and seated.
6 Close HMS draw latch door and lock using key.
7 Lock HMS with external lock.
8 Notify operator that replacement is complete and verify that no new alarms have been generated and
that old alarms are cleared.
9