User's Manual Part 2

Field Replacement Procedures PAF-0813-E0-001
4-4 044-05287 Rev A
Subrack Cooling Fans
Refer to Chapter 3 - Air Conditioning for cooling-fan operating parameters before replacing fans. To replace
an inside or rear mounted cooling fan or change the fan mounting configuration, proceed as follows:
Inside Mount
To replace the inside mounted fan, shown in Figure 4-2, perform the steps in Table 4-4.
Figure 4-2 Inside Mount Cooling Fan Removal and Replacement
CAUTION: To prevent damage to MCPA rear connector, support rear of MCPA when
removing from subrack. MCPA weight is approximately 20 lbs (9.1 kg).
CAUTION: The replacement fan may operate when the power connector is connected.
Ensure that no objects (fingers, screwdrivers, etc.) intrude into the fan area.
Table 4-5 Inside Mount Cooling Fan Removal and Replacement Procedure
Step Action
1. For fan assembly located behind blank panels, rotate quarter-turn fasteners on each
panel counter-clockwise to remove panels from subrack, then proceed to Step 4
2. For fan assembly located behind MCPAs, set each front panel OFF/ON/RESET switch
to OFF
3. Read above Caution. Rotate quarter-turn fasteners on each MCPA counter-clockwise
and remove MCPAs from subrack
4. Disconnect fan power connector and pull out snap fasteners to remove fan
5. Install replacement fan assembly in reverse order of removal
Cooling
Fan
Snap
Fasteners (4)
Power/Sense
Connector
Assembly
RF OUT
ETHERNET
RS485
FILTER I/O
AMPS1 AMPS2 CDMA1 CDMA2 CDMA3 CDMA4
DIGITALANALOG