Operation and Maintenance Manual

385700-4006-006 MAINTENANCE AND TROUBLESHOOTING
Document use is restricted to that described on cover 4-4
4.3 TEST PROCEDURES
Refer to Table 4-2 Test Equipment, for a list of test equipment to perform the following test
procedures. If necessary, substitute an equivalent to the equipment listed.
The following test procedures help the user verify that a DLA is faulty. Return faulty amplifiers to
Andrew Corporation for maintenance and repair. Refer to paragraph 2.1.1 for equipment return
information.
Equipment
Qty
Part Number
Spectrum Analyzer 1 HP8561B
Power Meter 1 HP437B
Power Sensor 1 HP8481A
Power Sensor 1 HP8481D
Digital Volt Meter 1 Fluke Model 77
RF Signal Generator 1 HP 8664A
10 dB Power Attenuator As required Inmet 6N10W-10
Variable Attenuator As required HP 8495B
Coaxial Cables As required
Table 4-2 Test Equipment
4.3.1 Inoperative Distribution Line Amplifier
DANGER! High voltage shock hazard.
4.3.1.1 Input Power Verification
Disconnect the power connector to the DLA. Using a DVM verify the levels of the AC input
voltage. See Figure 2-3 DLA Input VAC Pin-outs for additional information. If the input power
level is present, reconnect the power connector to the DLA.
If the input power is available to the DLA, open the amplifier and verify that the LED on the power
supply is illuminated. See Figure 1-3 DLA Internal View. If the LED is illuminated, then verify the
coaxial and Alarm/control signal connections.
If the power supply LED is not illuminated, unscrew the two fuses at the DLA connector plate.
WARNING