User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 4: maintenance
Page 4-7
© 2004, ADC Telecommunications, Inc.
3.1 Host Unit Troubleshooting
Use this section to troubleshoot alarms that originate with the Host Unit. When a Minor alarm
occurs, one (or more) of the Host Unit LED’s with turn yellow and the EMS software will
indicate a minor fault/alarm. When a Major alarm occurs, one (or more) of the Host Unit LED’s
will turn red and the EMS software will indicate a major fault/alarm. Locate the LED and the
corresponding software fault/status indicator in Table 4-4 and then take the corrective action
indicated.
Table 4-4. Host Unit Fault/Alarm Isolation Diagram
Power
Host Unit Front Panel LED
Standby
Host
Unit
Green - Normal
Yellow - Minor Alarm
Red - Major Alarm
Green - Powered
Off - Not powered
Green blinking - Standby
Yellow blinking -
Program load
Red blinking - Test
Off - Normal
Temperature - Over temperature
LO Synth Lock - Local
oscillator synthesizer out of lock
Pri Rev Synth Lock - Reverse
primary synthesizer out of lock
8 Volt - Onboard 8 Volt power
supply below threshold
3.8 Volt - Onboard 3.8 Volt power
supply below threshold
Pri Fwd Mux Lock - Forward primary
phase locked loop out-of-lock
Pri Laser Fail - Forward primary
laser failure
Hardware mismatch - Host and
Remote band mismatch
Software Fault/Status Indicator
Replace HU
Table 4-5
Problem B
Replace HU or
STM with
correct unit
Corrective Action
or Reference
Oper Mode - Operational
mode of system
No specific HU faults - Only
faults with no associated LED
are displayed
Table 4-5
Problem A
Use EMS to
change system to
required mode
Continued
20013-A