Nortel North American DMS-100 Instruction Manual page 58

1-42 Trouble locating and clearing procedures (continued)
Repairing FAN faults on an LCEI frame;
cooling unit replacement
At the front of the frame
17
At the PDC
18
At the back of the frame
19
At the front of the frame
20
21
22
At the back of the frame
23
297-8021-544 Standard 14.02 May 2001
(continued)
If you
you do not want to repair the
cooling unit while the unit is in
the frame
Locate the fan fuses in the front of the cooling unit. Remove the 0.5-amp
fuses, (numbered 1 through 5).
Remove the cooling unit fuses (cooling unit 0 or 1).
WARNING
Damage to the cooling unit
Instead of a plug, the cooling unit can have leads that end on
a terminal strip. If the cooling unit has leads, label the leads
before you disconnect them. If you reconnect the leads to the
wrong connector, damage to the cooling unit can result.
WARNING
Loss of frame cooling
Disconnection of the cooling unit for an extended period of
time can cause the equipment in the frame to overheat.
Disconnect the power plug or power leads at the back of the cooling unit.
Remove the cooling unit from the frame.
Obtain a replacement NTBX63AA cooling unit. Refer to company procedures
on repairs to damaged units. The company procedures can direct you to
repair the damaged cooling unit in-house. Refer to procedure Repairing a
NTBX63AA cooling unit in this document.
Push the replacement cooling unit into the frame.
Replace the three mounting screws at the back center of the cooling unit
removed in step 12. Secure the screws in position.
Do
step 17