Nortel Networks BCM200, 400 4.0 Replacing or installing a cooling fan, Replacing a cooling fan

Chapter 25 Replacing or installing a cooling fan 323

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 323

•“Troubleshooting cooling fans” on page 334

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.

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 324

•“Installing a BCM400 cooling fan” on page 326

•“Removing a BCM200 cooling fan” on page 329

•“Installing the BCM200 cooling fan” on page 331

•“Removing an expansion unit fan” on page 332

•“Installing an expansion unit fan” on page 334

Cooling fans circulate air through the main unit and expansion unit to prevent the components from overheating.

Figure 176 provides an overview of the fan replacement process.

BCM200/400 4.0 Installation and Maintenance Guide