Comtech EF Data KST-2000A/B - Manual (Page 81)

4–1
Chapter 4. FAULT INDICATION
AND ISOLATION
This section describes fault indication and isolation methods for the KST-2000A/B sys-
tem. Routine maintenance for the system consists only of assuring air flow for cooling of
the units, particularly assuring that debris does not prohibit proper fan function on HPAs
so equipped. A system fault is indicated in three ways:
• An external LED
• Form C relay contacts
• The remote M&C control
4.1 Fault Indication
The KST-2000A/B converter unit has two external LED indicators as shown pictorially
in Figure 2-1. The TX ON indicator is GREEN when illuminated, and the FAULT indi-
cator is RED.
When prime power is applied to the KST-2000A/B and the HPA is transmitting power,
the TX ON indicator is a steady GREEN. The indicator flashes when prime power is ap-
plied but the HPA is not transmitting. The FAULT indicator is a steady RED when any
fault is detected by the internal M&C processor.
The REMOTE connector (J2) has pins assigned (see Chapter 2, section 2.2 for pin as-
signments) for the contacts on two form C relays, one for the uplink and one for the
downlink. Normally open contacts close and normally closed contacts open when there
is a fault in any part of the uplink or downlink. Fault isolation requires the use of the re-
mote M&C as described in section 4.2.