Nortel Networks BCM200/400 - Manual (Page 332)

332 Chapter 25 Replacing or installing a cooling fan
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Figure 177 Cooling fan replacement overview
Removing a BCM400 cooling fan
Use this procedure to remove the cooling fans in a BCM400 standard or redundant feature option
(RFO) configuration. The BCM400 standard main unit has one fan. The BCM400 RFO has two
fans.
Before you shut down the system, determine if a fan (in the redundant version) has failed. Refer to
Table 86 .
To remove a BCM400 cooling fan
1 Shut down the system (see “Performing a system shutdown” on page 239 ).
2 Disconnect the BCM system from the AC power outlet.
3 Attach one end of the grounding strap to your wrist and the other end to a grounded metal
surface.
4 Remove the fan access panel at the rear of the BCM400 main unit (see Figure 178 ):
a Remove the fan access panel screws at the top and bottom of the panel. Place the screws in
a safe location.
b Tip the top of the fan access panel toward you.
c Grasp the fan access panel with both hands and lift the away from the main unit. Do not
stretch the fan cables.
Warning: Protect the hardware components against damage from electrostatic discharge.
Always wear a grounded wrist strap before you handle components. Always place the
components in a static-free container.
Set up unit for
maintenance
Install new fan.
Connect fan
cables to power
Restore unit to
operation
Check fan LED
FAN LED and/or
temp. LED
indicate problem
Disconnect and
remove failed fan