Operation and Maintenance Manual

385700-4006-006 MAINTENANCE AND TROUBLESHOOTING
Document use is restricted to that described on cover 4-1
CHAPTER 4
MAINTENANCE AND TROUBLESHOOTING
4.1 TROUBLESHOOTING
Before beginning any in-depth troubleshooting, ensure that power is available to the unit. Ensure
that all cable connections are secure.
Table 4-1 DLA Fault Isolation, describes the troubleshooting procedures for the DLA. Locate
the unit’s symptom in the Fault Indication column. The Fault Description column lists
components or functions that can cause faults. The last column, Corrective Action, specifies the
action necessary to correct the fault. After taking corrective action, perform the appropriate
diagnostic procedure to verify that the correction was successful.
For malfunctions that the fault isolation table does not list, contact Andrew’s technical support
personnel.
NOTE
The following table only isolates faults to
the LRU level. The test procedures in
Section III of this chapter provide
assistance for further fault isolation. If an
LRU fails, return it to the equipment
manufacturer for maintenance or repair.
Step Fault Indication Fault Description Corrective Action
1 No output signal No input power Verify power input cable
2 No output signal No power in amplifier Replace fuses
3 No output signals Poor connections Verify connections
4
RADIAX

Alarm
No BDR input signal Verify cables connections to J4 (forward
direction) or J3 (reverse direction)
5
RADIAX

Alarm
No BDR input signal Verify preceding cascaded amplifier is
operational
6
RADIAX

Alarm
No BDR input signal If valid inputs, replace amplifier
7 Amplifier Alarm No BDR and/or MDR
output RF signals
If valid inputs, replace amplifier
8 Direction Control
invalid status
Direction control status
is opposite of direction
control input control
If valid inputs, replace amplifier
Table 4-1 DLA Fault Isolation