User's Manual Part 2

Fan Module – continued

MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-5

PRELIMINARY

Upon completion of the replacement procedure, have the OMC–R

operator verify that old alarms are cleared and that no new ones are

reported.

Replacement Procedure

This procedure requires working around circuitry that is

extremely sensitive to Electrostatic Discharge (ESD). Wear

a conductive, high impedance wrist strap during the

procedure.

Use appropriate safety measures.

CAUTION

If desired, record the BTS and Fan Module serial number of the failed

unit in Table 9-53 at the end of this chapter.

Remove Fan Module

Use the procedure in Table 9-1 to remove the fan module.

Table 9-1: Procedure to Remove Fan Module

Step Action

1 Notify operator that the fan replacement procedure is starting and that alarms can be expected.

2 Put on the ESD wrist strap or another approved grounding device.

3 If not already done, remove BTS front panel cover by grasping finger grooves at the top and bottom

and pulling simultaneously.

4 Lower the latch on front of the fan module while gently pulling it forward.

5 When the fan module is half–way out, support it with the other hand and remove it the rest of the way.

Figure 9-3: Fan Module