256 Chapter 39 Hardware procedures
NN10600-175 6.1S2
Installing a cooling unit into a Multiservice Switch 7440
Install a cooling unit into a Nortel Networks Multiservice Switch 7440 after
you remove the failed unit.
Prerequisites
• You need a cooling unit with PEC NTEP14BA.
• Multiservice Switch 7440s have two kinds of cooling units. In older
models, the fans connect when you push the cooling unit all the way into
the back of the device. In newer models, you must plug each fan into a
connector inside the cooling unit door.
•Follow “Avoiding damage from static electricity” (page 208) to protect
the unit from damage by ESD or from transferring ESD to other
hardware.
Procedure steps
1 Insert the back edges of the cooling unit tray into the tracks. Push the
cooling unit all the way into the device.
If you have the newer model cooling unit, the wires that connect the fans
to the device are at the front of the fan tray.
2 If you have the newer model, plug each wire into its connector and fasten
the wires with a tie wrap.
If you do not have the newer unit, continue to the next step.
3 Close the cooling unit door.
4 Lock the door: use a 1/4-in. slot-head screwdriver to turn the latch on the
cooling unit door one-quarter turn clockwise.
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