User Manual

ADCP-75-126 • Issue B • April 2002 • Section 5: Maintenance
Page 5-5
© 2002, ADC Telecommunications, Inc.
Table 5-3. Linear Power Amplifier LED Indicators and Digital Display
INDICATOR COLOR DESCRIPTION
FAIL
Off
Yellow
Indicates if the LPA is normal or faulty.
The LPA is normal.
Internal fault detected in the LPA.
SHUTDOWN
Off
Red
Indicates if the LPA has an RF output or if the RF output
is shutdown.
The LPA RF output is on.
The LPA RF output is shutdown.
DISPLAY MESSAGE DESCRIPTION
ADC1940
0 ALARMS
NORMAL OPERATION
The LPA is normal.
HUNG CHANG
ADC-1940M
Appears every time power is turned on.
RESTART AT STAND
ALONE MODE
Appears when LPA is reset.
ADC-1940S Appears when an alarm has turned off and the LPA is restart-
ing after the RESET button has been pressed or the reset com-
mand has been supplied from an external source.
PLEASE WAIT WHILE
RESTARTING
Appears while the LPA processor is rebooting.
DC +12V: +12.0V
DC +27V: +27.0V
DC +32V: +32.0V
DC -12V: -12.0V
Alternately displays the voltage flow in each part of the LPA.
TEMPER 100.0 ºC Indicates the current temperature of the LPA heat sink.
OVER POWER ALARM Output power has exceeded 100 W.
HIGH TEMPERATURE Alarm: Temperature of LPA exceeds 85 ºC.
VSWR ALARM Reflected LPA power exceeds 20 W.
LOOP FAIL General fault occurred in the LPA loops.
FANFAIL One or more fans have failed.
FORCED SHUTDOWN The RF ON/OFF switch is in the OFF position or the LPA was
set in the disable mode through the EMS computer.
Alternating FORCED SHUTDOWN
and alarm message
An alarm has remained for over 5 seconds.
DC FAIL
+12V
-12V
+32V
Volt a g e is outside the preset ranges:
+11 to +13V
-13 to -11V
+30 to +34V