User Manual

AS4000 Operations and Maintenance

Section

605-0000-431

. Issue 1.6. Date3/2/99

DLP-011

Page 38 of 44 © Copyright Airspan Communications Corporation 1999

POWER AMPLIFIER (PA) ALARMS

Alarm Indications

AS8100 (Sitespan) : ‘Combiner:PowerAmp(N):FRU Fail’

Rack: Major/Prompt

Modem Shelf Alarm Panel: Fault Alarm

Card Alarm: PA Fail

Probable Cause

Faulty PA module

Consequences:

Loss of service to all users connected to associated modem shelf.

Maintenance Clear Strategy

Change PA

STEP PROCEDURE

Observe full ESD precautions.

1. Press Receive Attention on the modem shelf covers to suppress alarm.

2. Change PA module. Each PA Unit contains two Power Amplifiers, when the Power

Amplifier is removed the traffic from two modem shelves will be disrupted. Use a

screwdriver to release the screw twist retainers from the top and bottom of the PA (half a

turn is sufficient). Use the handles to ease the card from the backplane connector. Use

caution when handling the PA as the unit may be hot. Replace the card ensuring that the

card is located within the shelf card guides. PA2 is inserted inverted. Use the extractor

lever to ensure that the card locates properly. Use a screwdriver to secure the screw twist

retainers at the top and bottom of the PA.

3. The PA will be set to the values contained in the RF card and will adjust its power output

using the control loop.

HOT

Amber OK

Red PA1 Fail

Red PA2 Fail