Comtech EF Data KPA080 Installation And Operation Manual page 76

KPA080 Ku-Band Solid-State Power Amplifier
Symptom
Amplifier Temperature
Fault
9V power supply fault
(PS1 and/or PS2)
Faulty/Improper
Redundancy Switch
Operation
Rev. 0
Table 6-1. Troubleshooting (Continued)
Possible Cause
Note: SSPA module contains as internal temperature monitor that wilkl shut off
the unit (i.e. turn off the 9V supplies) if the Heatsink temperature becomes
excessive. This prevents the transistors from overheating and destruction. After
cooling down below the tripo point, the unit will automatically restart.
1. Operating temperature
limits exceeded.
2. Air intake or air exhaust
paths obstructed.
3. Fan failed.
4. Defective transistors in
amplifier module.
1. Faulty wire or
connection.
2. Excessive current draw
from transistor inside
amplifier module.
3. Faulty power supply.
1. Faulty wiring or
connections.
2. Improper settings.
Maintenance and Troubleshooting
Solution
1. Do not exceed 50°C (122°F) ambient input
air temperature.
2. Remove obvstructions to ensure adequate air
flow and proper amplifier cooling.
3. Check fan operation. Remove and replace
fan(s) as required.
4. Use Monitor menu to check transistor
currents. Compare readings with the
specified nominal values. Report excessive
readings to the manufacturer for repair.
There are no user serviceable parts inside
the SSPA amplifier module.
1. Check cable and connections from PS1 and
PS2 to amplifier module. On outside of
module, measure voltage.
Reading should be = 9.0 ± 0.5 VDC.
2. Use Monitor menus to check transistor
currents. Record excessive values and return
entire unit to manufacturer for repair.
3. Return failed power supply for repair.
Replace with the new power supply.
1. Ensure that the RF and control cables are
connected. Poor RF performances would
tend to indicate a faulty SSPA
cable/connector.
a. Improper switch control would indicate
a problem with the control cables.
b. Ensure the ends of the cables labeled
backup are connected to the backup
unit.
2. Check redundancy setup in Configuration
menu.
6-5