Juniper Networks M160 manual Replacing Cooling System Components, Replacing the Fan Tray

M160 Internet Router Hardware Guide

5.Orient the terminal block according to the labels to the left of the appropriate relay contact (NC means “normally closed,” C means “common,” and NO means “normally open”).

6.Plug the terminal block into the relay contact and use a 2.5 mm flat-blade screwdriver to tighten the screws on the face of the block.

7.Attach the other end of the wires to the external device.

Replacing Cooling System Components

For instructions on replacing cooling system components, see the following sections:

Replacing the Fan Tray on page 148

Replacing the Front Impeller Assembly on page 150

Replacing the Rear Lower Impeller Assembly on page 154

Replacing the Rear Upper Impeller Assembly on page 156

Replacing the Fan Tray

To replace the fan tray, perform the following procedures:

Removing the Fan Tray on page 148

Installing the Fan Tray on page 149

Removing the Fan Tray

The fan tray is located behind the cable management system on the front of the chassis, as shown in Figure 1. It weighs approximately 13 lb (5.9 kg).

To remove the fan tray, follow this procedure (see Figure 69):

1.Unwrap any PIC cables from the spools on the cable management system and remove the cables from the tray. Arrange the cables so that they do not block the front of the cable management system and tray, and secure them with temporary fasteners so that they are not supporting their own weight as they hang from the connector.

CAUTION: Do not let fiber-optic cable hang free from the connector. Do not allow fastened loops of cable to dangle, which stresses the cable at the fastening point.

148 Replacing Cooling System Components