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Chapter 4 Operating the Modulator
Replace the Fan
The MQAM modulator has three dual fan units on the side panel. Each of these units
contains two fan rotors. You must replace the entire dual fan unit if one of the fan
rotors should fail. The fan units are designed to be "hot swappable," meaning that
you do not necessarily have to power down the MQAM to replace a fan unit that has
failed.
Important: In order to hot swap a dual fan unit, you must have the following:
Sufficient length in all cords and cables so you can slide the device forward in the
rack far enough to fully access the dual fan units on the side panel.
The ability to externally support the MQAM with a cart or table or with the
assistance of another person.
Notes:
The part number for the replacement fan unit is 4003088.
The part number for the kit that includes the replacement fan and instruction
sheet is 4007620-40.
If you do not have sufficient length in all cords and cables, you will have to
power off the unit, disconnect all cords and cables, and completely remove the
MQAM from the rack to replace a dual fan unit that has failed.
This section provides the procedure for replacing a dual fan unit on the MQAM by
either hot swapping the fan unit, or by powering off, disconnecting, and removing
the MQAM completely from the rack.
When Can I Perform This Procedure?
If you cannot hot swap the dual fan unit, you need to replace the fan unit during a
maintenance window. This is necessary because you will have to power off and
disconnect the MQAM to replace the fan unit, thereby temporarily disrupting all
broadcast services configured and provisioned on this MQAM.
Important! Schedule the maintenance window to replace the fan as soon as possible
to avoid damage to the MQAM.
Location of Fans
The fans are located on the MQAM side panel as follows:
Fans 1 and 2 are located nearest to the back panel.
Fans 3 and 4 are the middle fans.
Fans 5 and 6 are located nearest to the front panel.
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Troubleshooting
