User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
4
. Issue 1.6. Date3/2/99
DLP-010
Page 35 of 44 © Copyright Airspan Communications Corporation 1999
LOW NOISE AMPLIFIER (LNA) ALARMS
Alarm Indications
AS8100 (Sitespan) : ‘LowNoiseAmp:FRU Fail’
Rack: Major/Prompt
Modem Shelf Alarm Panel: Fault Alarm
Card Alarm: LNA Fail
Probable Cause
LNA failure
Consequences:
Total loss of service to all subscribers.
Maintenance Clear Strategy
Change LNA
STEP PROCEDURE
Observe full ESD precautions.
1. Press Receive Attention on the modem shelf cover to suppress alarm.
2. Change LNA. Power should be removed from the rack using the two switches at the
bottom right of the combiner shelf. Disconnect the ‘N’ Type antenna connector from the
top of the card. Use the board extractor lever to remove the card from the shelf. Replace
the card ensuring that the card is located within the shelf card guides. Use the extractor
lever to ensure that the card locates properly. Connect the N type connector.
3. When the RF card is changed the receive sensitivity will need to be set as outlined in
Section 6 (DLP-013 for 2.0 - 2.3GHZ BAND and S Band or DLP-014 for 3.4-3.6GHz
Band).
4.
STOP. THIS PROCEDURE HAS BEEN COMPLETED.
Power / Module Status OK
Fail
Amber
Red