Repairing And Replacing Nt3X90Ac Cooling Units - Nortel North American DMS-100 Instruction Manual

Repairing and replacing NT3X90AB cooling units
Summary of Repairing and replacing NT3X90AB cooling units
Start
Blown fuse?
N
Harness or
Y
single fan
that has
faults?
N
Air flow
Y
sensor
that has
faults?
N
This flowchart summarizes the
procedure.
Use the instructions that follow this
flowchart to perform the
procedure.
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Dirty
filter?
N
Y
Replace fuse
Row of
N
fans that
have
faults?
Y
Replace
inverter
Replace fan or
harness
Replace air
flow sensor
Clean or
Y
replace filter
FAN FAIL
lamp out?
N
Repair
Y
unit on
premises?
N
Replace
cooling unit
Next level of
support
(continued)
Y
N
Y
FAN FAIL
lamp out?
End
1-65