User's Manual

Lucent Technologies — Proprietary
See notice on first page
401-660-100 Issue 11 August 2000
22-21
Linear Amplifier Circuit (LAC) Maintenance
Figure 22-4. Flowchart of the Preamplifier Diagnostic Procedure
Sanity Alarm Procedure
A LAC SANITY alarm is reported to the MSC by the UN166 AFI board in the
Radio Control Frame when the alarm status of an LAC cannot be determined. It
START
NO
YES
IF FUSES
BLOW AGAIN
DONE
PREAMP
LED ON?
RECORD RADIO
TRAFFIC
CONDITIONS
REMOVE
RADIOS FROM
SERVICE
CHECK BOTH
PREAMP FUSES
FUSES
OK?
YES
NO
PERFORM THE RADIO
CONTROL PROCEDURE
RETURN AT TIME
WHEN ALARMS
ARE REPORTED
PREAMP
LED ON?
YES
NO
PREAMP
LED ON?
YES
NO
REMOVE
BOTH
FUSES
TURN OFF
ALL RADIOS
is not exhibiting a preamp alarm.
is replaced, rule out cables as a cause
by swapping or replacing cables. Also
try connecting a preamp from a LAC that
is not exhibiting a preamp alarm.
NOTE: If alarms persist after a preamp
REMOVE DC CABLE
FROM PREAMP AND
CHECK FOR SHORTS
YES
NO
CABLE
OK?
ALLOW A 30 MINUTE
WARM-UP PERIOD BEFORE
ADJUSTING THE GAIN
USE RADIO CONTROL
PROCEDURE TO VERIFY
ALARM REMAINS CLEAR
REPLACE PREAMP
TURN GAIN
ADJUST. TO MIN.
(CTR. CLKWISE)
INSERT 2
NEW FUSES
REPLACE
CABLE AND
FUSES
PREAMP
LED ON?
YES
NO