User's Manual

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 4: MAINTENANCE
Page 4-8
© 2005, ADC Telecommunications, Inc.
Table 4-5. Remote Unit Fault/Alarm Isolation Diagram
Remote Unit LED Software Fault/Status Indicator
Off - Not powered or Normal
No Response for
Minor Alarm
Red - Major Alarm
Temperature - Over temperature
Replace RU
See Table 4-6
Problem A
Corrective Action
or Reference
Converter - Power supply
converter failure
LO Synth Lock - Local
oscillator synthesizer out of lock
Fwd Synth Lock - Forward
synthesizer out of lock
Pri Rev Synth Lock - Reverse
primary synthesizer out of lock
Ref Synth Lock - Reference
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 Rev Mux Lock - Reverse primary
phase locked loop out-of-lock
Pri Laser Fail - Reverse primary
laser failure
LPA DC Fail - LPAa
power supply failure
LPA Loop Fail - LPA
internal loop failure
LPA Low Power - LPA
internal amplifier failure
Continued
20584-B
See Table 4-6
Problem E
See Table 4-6
Problem E
See Table 4-6
Problem C
See Table 4-6
Problem B
See Table 4-6
Problem A
See Table 4-6
Problem D
Replace HU or
RU with
correct unit
LPA Temp - LPA over
temperature
LPA Over Power - LPA
signal level too high
LPA VSWR - The LPA
VSWR is too high
System VSWR - The VSWR at
the quadraplexer is too high
Pri Rx Light - No light received
over optical forward path
Pri Errors - Excessive errors
received over optical forward path
Hardware mismatch - Host and
Remote band mismatch
One LED, no
designation