Nortel Networks BCM200/400 - Manual (Page 331)

Chapter 25 Replacing or installing a cooling fan 331
BCM200/400 4.0 Installation and Maintenance Guide
Chapter 25
Replacing or installing a cooling fan
This chapter describes how to replace a cooling fan in the BCM200 and BCM400 main unit. This
chapter also describes how to add a second fan to the BCM400 main unit (available through the
field redundancy upgrade kit).
This chapter contains the following topics:
• “Replacing a cooling fan” on page 331
• “Troubleshooting cooling fans” on page 342
Replacing a cooling fan
This section contains procedures to replace the cooling fan in the BCM200 and BCM400 main
unit, and the expansion unit. This section contains the following topics:
• “Removing a BCM400 cooling fan” on page 332
• “Installing a BCM400 cooling fan” on page 334
• “Removing a BCM200 cooling fan” on page 337
• “Installing the BCM200 cooling fan” on page 339
• “Removing an expansion unit fan” on page 340
• “Installing an expansion unit fan” on page 342
Cooling fans circulate air through the main unit and expansion unit to prevent the components
from overheating.
Figure 177 provides an overview of the fan replacement process.
Note: For the BCM400 RFO configuration, a redundant cooling fan and power supply is
included.
Warning: You must remove all of the connections to the BCM main unit before you
power the system down. Failure to disconnect lines before you power down the system
can cause damage to the system.
Warning: Protect the hardware components against damage from electrostatic discharge.
Always wear a ground wrist strap before you handle components. Always place the
components in static-free container.