Comtech EF Data KPA - Manual (Page 85)

KPA Ku-Band Indoor Solid-State Power Amplifier Revision 1
Appendix A MN/KPA.IOM
A–5
Issue Possible Cause(s) Solution(s)
Amplifier Temperature Fault 1. Operating temperature limits
exceeded.
2. Air intake or air exhaust paths
obstructed.
3. Fan failed.
4. Defective transistors in amplifier
module.
1. Do not exceed 50 °C (122°F) ambient input
air temperature.
2. Remove obstructions 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 KPA amplifier module.
Note: The KPA amplifier module contains an internal temperature monitor that will shut off the
unit (i.e. turn off the 9V supplies) if the heat sink temperature becomes excessive. This
prevents the overheating and destruction of the transistors. After cooling down below the trip
point, the unit will automatically restart.
9V power supply fault (PS1
and/or PS2)
1. Faulty wire or connection.
2. Excessive current draw from
transistor inside amplifier module.
3. Faulty power supply.
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.
Faulty/Improper Redundancy
Switch Operation
1. Faulty wiring or connections.
2. Improper settings. 1. Ensure that the RF and control cables are
connected. Poor RF performances would
tend to indicate a faulty KPA
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.