Comtech EF Data CPA - Manual (Page 119)

CPA C-Band Indoor Solid State Power Amplifier Revision 1
Appendix A MN/CPA-IN.IOM
A–3
A.3.1 Troubleshooting Guide
Issue Possible Cause(s) Solution(s)
Unit does not turn on
(No front panel display, no
front panel LEDs lit, no fans)
1. Check power cord connections.
2. Faulty wiring to 28V power supply.
3. 28V power supply fault. 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.
Fan(s) do not turn On. Faulty wiring or bad connections. 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 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 faulty or return to factory
for repair.
Firmware not properly seated. 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.
Faulty 28V power supply. Check the output voltage of the 28V power supply:
1. Either via the front panel SELECT: Monitor
 PS menu, Web Server Interface ‘Status |
Status’ page, or by using a voltmeter.
2. Ensure that 28V is present.
Failed fan or faulty control circuitry. Fan defective:
1. Replace fan.
2. Return to factory for repair re replacement.
Display not turning on,
missing text, or incorrect
backlighting.
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.
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.