Removing A Fan - Nortel Passport 15000 Hardware Installation And Maintenance

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682 Chapter 17 Hardware procedures

Removing a fan

Prerequisites
241-1501-240 5.2S2
Remove a fan to replace it if it fails, or to gain access to the cooling unit
assembly for replacing the fan controller or the temperature sensors.
WARNING
Risk of electrocution from a fan cable
When replacing a fan or a fan controller, the first action to
the fan assembly is to unplug the appropriate power cable
connector at the left labelled F1, F2, or F3. Temporarily tie
it aside loosely and tape over the end. Remember the cable
still has power.
WARNUNG
Verletzungsgefahr durch Lüfterkabel
Beim Austauschen von Lüftern oder Lüftersteuerungen
muß immer zuerst die Stromversorgungsleitung der
Lüfterbaugruppe abgezogen werden. Der Anschluß
befindet sich auf der linken Seite und ist mit F1, F2 oder
F3 beschriftet. Binden Sie das Kabel vorübergehend zur
Seite, damit es nicht im Weg hängt. Denken Sie daran, daß
das Kabel noch Spannung führt.
You must be familiar with "Safety considerations and best practices"
(page 53).
For any version of a fan, you need a driver for the 4-mm (11/64-in.) hex-
head screws that fasten the fan and its grill to the cooling unit. The screws
are 65-mm long for an A0758423 in an NTHR51AA or an NTHR52AA.
The screws are 60-mm long for an A0522179 or an A0522182 in an
NTHR51AB or an NTHR52AB.
You need a flashlight and a hand-mirror to clearly see a fuse inside the
cooling unit on the fan controller.
The cause of a fan not operating can be a blown fuse on the fan controller
module. The fuse on an NTHR10AA is a 4-amp fast-acting surface-
mount technology (SMT) device, while an NTHR10AB has a 5-amp
fast-acting SMT device. The fuse is soldered to the circuit board and is

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