Table 6-1. Troubleshooting - Comtech EF Data KPA080 Installation And Operation Manual

KPA080 Ku-Band Solid-State Power Amplifier
Symptom
Unit does not turn On
(No display, No front
panel lights, No fans)
Fan(s) do not turn On.
Display not turning On,
Missing text, or Incorrect
backlighting.
Rev. 0

Table 6-1. Troubleshooting

Possible Cause
1. Check power cord
connections.
2. Faulty wiring to 28V
power supply.
3. 28V power supply fault.
Faulty wiring or bad
connections.
Firmware not properly
seated.
Faulty 28V power supply.
Failed fan or faulty control
circuitry.
1. Firmware not properly
seated.
2. Faulty wiring or bad
connections.
3. Failed display or display
control card.
4. circuitry on AS/0200 or
AS/0206 PCB.
Maintenance and Troubleshooting
Solution
1. Ensure power cord is connected.
2. With input power cord disconnected, check
wiring and connections to 28V power supply.
Reconnect power cord.
3. Check output of 28 VDC power supply.
Remove and replace 28V power supply.
At power-up, the fans are sequenced on. In
Normal operation, the second fan does not turn
on until 3 seconds (approximately) after the first
fan.
1. Check AS/0206 PCB to ensure the
connections at P4 and P5 are not loose.
2. Check cable connection at the fans. There
should be 24 VDC (approximately) between
the two pins at the fan.
3. Check cable wiring if fautly or return to
factory for repair.
Fans are microprocessor controlled and
monitored.
1. Ensure U11 and U12 on AS/0200 are
properly seated.
2. Remove and replace AS/0200 PCB if
damaged.
Check the output voltage of the 28V power
supply.
1. Either via the front panel Monitort menu or
using a voltmeter.
2. Ensure that 28V is present.
Fan defective.
1. Replace fan.
2. Return to factory for repair re replacement.
1. Ensure U11 and U12 on AS/0200 are
properly seated.
2. Ensure good cable connections from M&C
cards AS/0200 and AS/0206 to display card
located behind front panel. Check cable
wiring and if required return cables to factory.
3. Return to factory for repair.
4. Return to factory for repair.
6-3