Replacing M120 Cooling System Components; Replacing An M120 Fan Tray; Removing An M120 Fan Tray; Figure 62: M120 Routing Engine Interface Ports And Alarm Relay Contacts - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide
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Replacing M120 Cooling System Components

Replacing an M120 Fan Tray

134
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Plug the terminal block into the relay contact and use a 2.5-mm flat-blade screwdriver
5.
to tighten the screws on the face of the block.
Attach the other end of the wires to the external device.
6.

Figure 62: M120 Routing Engine Interface Ports and Alarm Relay Contacts

Alarm Relay Contacts on the M120 Craft Interface on page 28
Connecting the M120 Router to Management and Alarm Devices on page 81
M120 Fast Ethernet PIC 48-Port Cable Pinouts on page 254
Preventing Electrostatic Discharge Damage to an M120 Router on page 192
Routing Engine Interface Ports and Status Indicators on the M120 Craft Interface on
page 25
Replacing an M120 Fan Tray on page 134
Replacing an M120 Air Filter on page 138
The router has two front fan trays and two rear fan trays. Both the front and rear fan trays
install horizontally above and below the FPC card cage. Each front fan tray contains eight
fans. The two front fan trays are interchangeable, and the two rear fans trays are
interchangeable, but the front and rear fan trays are not interchangeable. The fan trays
are hot-insertable and hot-removable.
To replace a fan tray, perform the following procedures:
Removing an M120 Fan Tray on page 134
Installing an M120 Fan Tray on page 136

Removing an M120 Fan Tray

In the front of the chassis, the upper fan tray is located above the FPC card cage, and the
lower fan tray is located below the FPC card cage. Each fan tray weighs about 7 lb (3.2 kg).
In the rear of the chassis, the upper fan tray is located above the rear card cage, and the
lower fan tray is located below the rear card cage. Each fan tray weighs about 5.3 lb (2.4
kg).
To remove any fan tray (see Figure 63 on page 135 and Figure 64 on page 136, which
illustrate the upper front fan tray and lower rear fan tray):
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