Nortel North American DMS-100 Instruction Manual page 91

-4 Trouble locating and clearing procedures
Repairing and replacing NT3X90AF cooling units
Summary of Repairing and replacing NT3X90AF cooling units
Start
Blown
fuse?
N
Repair
unit?
Y
Harness
has
faults?
N
Fan has
faults?
N
297-8021-544 Standard 15.01 March 2003
Y
Replace fuse
N
Replace
cooling unit
Repair harness
Y
or connections
Replace fan
Y
(continued)
This flowchart summarizes the
procedure.
Use the instructions that follow
this flowchart to perform the
procedure.
Y
FAN FAIL
lamp out?
N
Y
FAN FAIL
lamp out?
N
Contact next
level of support
End