Comtech EF Data CST-5000 - Manual (Page 112)

Rev. 9 6–1
6.
MAINTENANCE
This chapter provides information on how to use test points and LEDs on the M&C board
for troubleshooting. In addition, this chapter provides guidelines for troubleshooting
faults.
6.1 Test Points and LEDs
Test points and LEDs are included on the M&C board for quick troubleshooting
references. The LEDs are a visual reference. Test points are used when more
troubleshooting is required.
Refer to Table 6-1 for a list of LEDs and their functions. Refer to Table 6-2 for a list of
test points on the M&C board.
Table 6-1. M&C LEDs
Name Color Description
HPA FLT Red Illuminates when the HPA is faulted or turned off. This fault will cause the
transmitter to turn off.
LD IF Red Illuminates when the IF local oscillator is out of lock. This fault will cause the
transmitter to turn off.
LD UC Red Illuminates when the up converter local oscillator is out of lock. This fault will
cause the transmitter to turn off.
LD DC Red Illuminates when the down converter local oscillator is out of lock. This fault
will cause the transmitter to turn off.
LNA FLT Red Illuminates when the LNA is faulted, or LNA has not been calibrated.
RF ON Yellow Illuminates when the HPA is turned on.
12.5V Green Illuminates when 12.5V is applied to board.
5V Green Illuminates when 5V is applied to board.
Chapter