User's Manual Part 2

Chapter 6 Maintenance
5. Switch ON the HB HPA PSU circuit breaker (CB1), located on the PDU.
6. Using the HBE GUI, place the HB sub-system in broadcast mode.
7. Close the HPA compartment rear door and the electronics compartment front door.
6.5.10.3 LB 7/8” Short U-link/Coupler Removal
The HB 7/8” short U-link/coupler should be removed in the following sequence:
1. Open the electronics compartment front door.
2. Open the HPA compartment rear door.
3. Using the LBE GUI, place the LB sub-system in standby mode.
4. Switch OFF the LB HPA PSU circuit breaker (CB2), located on the PDU.
5. Disconnect the RF cable (SX03-10908-02) from the short U-link/coupler forward
coupling port – see Figure 6-19
.
6. Remove the two (2) 8-32 socket head cap screws (with #8 lock washers) which secure
the short U-link/coupler to the HPA compartment frame backplane – see Figure 6-19
.
7. Pull the short U-link/coupler from the HPA compartment frame backplane and set it
aside.
6.5.10.4 LB 7/8” Short U-link/Coupler Installation
Any RF cable, which is terminated with a SMA connector, should be
tightened with a 5/16” torque wrench to avoid over tightening and
damaging the cable connector or mating connector.
The replacement LB 7/8” short U-link/coupler should be installed in the following sequence:
1. Carefully line up the replacement short U-link/coupler with the H1 and H4 7/8” blind
mate connectors visible on the HPA compartment frame backplane. The arrow on the
long U-link/coupler should be pointing towards connector H4.
2. Push the short U-link coupler into the connectors until it stops – see Figure 6-19
.
3. Replace the two (2) 8-32 socket head cap screws (with #8 lock washers) which secure
the short U-link/coupler to the HPA compartment frame backplane – see Figure 6-19
.
A torque rating of 10.8 Inch Lbs. must be used to tighten the screws.
4. Re-connect the RF cable (SX03-10908-02) to the lshortU-link/coupler forward coupling
port – see Figure 6-19
.
5. Switch ON the LB HPA PSU circuit breaker (CB2), located on the PDU.
6. Using the LBE GUI, place the LB sub-system in transmit_only mode.
7. Close the HPA compartment rear door and the electronics compartment front door.
SX03-10000-01-M01 6-33