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User's Manual Part 2

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Chapter 6 Maintenance
6.5.11 7/8” Long U-link/Coupler Replacement
Open or loose RF connections during operation may cause electric arcs
that can cause burns and eye injuries, as well as damage equipment.
Always ensure that the HB sub-system has been placed in standby
mode and DC power to the HB HPA has been switched OFF.
6.5.11.1 7/8” Long U-link/Coupler Removal
The 7/8” long U-link/coupler should be removed in the following sequence:
8. Open the electronics compartment front door.
9. Open the HPA compartment rear door.
10. Using the LBE GUI, place the LB sub-system in standby mode.
11. Switch OFF the LB HPA PSU circuit breaker (CB2), located on the PDU.
12. Disconnect the RF cable (SX03-10908-02) from the long U-link/coupler forward
coupling port – see Figure 6-19
.
13. Remove the two (2) 8-32 socket head cap screws (with #8 lock washers) which secure
the long U-link/coupler to the HPA compartment frame backplane – see Figure 6-19
.
14. Pull the long U-link/coupler from the HPA compartment frame backplane and set it
aside.
6.5.11.2 7/8” Long 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 7/8” long U-link/coupler should be installed in the following sequence:
8. Carefully line up the replacement long U-link/coupler with the H1 and H5 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 H5.
9. Push the long U-link coupler into the connectors until it stops – see Figure 6-19
.
10. Replace the two (2) 8-32 socket head cap screws (with #8 lock washers) which secure
the long 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.
11. Re-connect the RF cable (SX03-10908-02) to the long U-link/coupler forward coupling
port – see Figure 6-19
.
SX03-10000-01-M01 6-34