Northern Telecom DMS-100 Series Maintenance Procedure page 25

Replacing the cooling fans
Step Action
1
At the frame supervisory panel (FSP), set the Fan Fail Override switch to
ON.
2 Remove the panel at the bottom of the cabinet by removing the nine
screws on the panel using a 1/4" nut driver. This allows you access to
the three cooling fans.
3 Locate the affected cooling fan and disconnect its four-pin connector,
visible on the underside of the plenum.
4
Slide the cooling fan out of the cabinet.
5 Slide the replacement cooling fan into place.
6 Connect the new cooling fan with the four-pin connector.
7 Re-install the panel.
8 At the FSP, set the Fan Fail Override switch to OFF.
DMS VoiceMail Routine Maintenance Procedures SPM 02
Routine maintenance procedures 1-15
Replacing the cooling fans
WARNING
Do not leave the cooling fan disconnected for an
extended period of time
Leaving the cooling fan disconnected could cause the
equipment to overheat and possibly fail.
(continued)