Nortel North American DMS-100 Instruction Manual page 64

1-48 Trouble locating and clearing procedures (continued)
Repairing an NTBX63AA cooling unit on the bench top
Repairing an NTBX63AA cooling unit on the bench top
At your current location
1
2
3
4
5
297-8021-544 Standard 14.02 May 2001
The cooling unit configuration in the frame can differ from the following
description. If you encounter an important difference, contact your next level
of support.
Place the NTBX63AA cooling unit that has faults on a bench.
WARNING
Incorrect fuse values
Always use replacement fuses of the correct rating, or
damage to the equipment can result.
Check the five fuses at the front of the unit and replace any blown fuses
WARNING
Temporary power supply
Ensure that you have an acceptable power supply to run the
unit without damage.
Connect the unit to an acceptable 48 V dc power supply.
Inspect the fan operation.
If the fans
work correctly
do not work correctly
Inspect the unit wiring harness for damage or loose switch connections.
If the harness
is damaged or loose
is not damaged or loose
ATTENTION
Do
step 21
step 5
Do
step 6
step 6
(continued)