Chapter 4; Troubleshooting; Table 4-1 Dla Fault Isolation - Andrew 2400 Operation And Maintenance Manual

385700-4006-006
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.
Step Fault Indication
1 No output signal
2 No output signal
3 No output signals

4
RADIAX Alarm

5
RADIAX Alarm

6
RADIAX Alarm
7 Amplifier Alarm
8 Direction Control
invalid status
Document use is restricted to that described on cover

CHAPTER 4

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.
Fault Description
No input power
No power in amplifier
Poor connections
No BDR input signal
No BDR input signal
No BDR input signal
No BDR and/or MDR
output RF signals
Direction control status
is opposite of direction
control input control

Table 4-1 DLA Fault Isolation

MAINTENANCE AND TROUBLESHOOTING
Corrective Action
Verify power input cable
Replace fuses
Verify connections
Verify cables connections to J4 (forward
direction) or J3 (reverse direction)
Verify preceding cascaded amplifier is
operational
If valid inputs, replace amplifier
If valid inputs, replace amplifier
If valid inputs, replace amplifier
4-1