Comtech EF Data KST-12025 - Manual (Page 107)

Rev. 1 6–1
6
Chapter 6.
MAINTENANCE
This chapter provides information on how to use the 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. 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 high-power amplifier is faulted. 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.
RF ON Yellow Illuminates when the high-power amplifier is turned on.
12.5V Green Illuminates when 12.5V is applied to board.
5V Green Illuminates when 5V is applied to board.