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Component Removal and Installation

75

If the T1 Modem Bank overheats or exceeds its operating range, the fan is probably malfunctioning. If this is the
case, follow the procedure below.

Wear a grounding strap while performing these procedures to prevent electrical discharge.

1.  Loosen the two captive screws on the display panel faceplate; carefully pull down the hinged display panel

faceplate to access the fan assembly.

2.  The fan assembly consists of a fan mounted on a card guide. Look into the chassis and observe the fan assembly

while the power is on. An unlit LED on the fan assembly indicates the fan is malfunctioning or the fuse is
blown.

3.  Turn off the T1 Modem Bank using the power switch on the rear of the unit.

4.  Slide the malfunctioning fan assembly out of the chassis.

5.  Slide the replacement fan assembly into the chassis.

• 

Make sure the fan assembly is installed so that the airflow will exit the chassis.

• 

Make sure the fan assembly is seated with the connector on the AC distribution board.

See Figure 26.

6.  Push up the hinged display panel faceplate and tighten the two captive screws.