18 Installation Note N5242-90125
Description of the Upgrade
Installation Procedure for the Upgrade
-
Step 9. Remove the A20 IF Multiplexer (IF MUX) Board
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
A20 IF Multiplexer Board” in the PDF Service Guide
Save all mounting hardware (except the stabilizer bracket) for reuse.
Step 10. Remove the A38–A41 Bias Tee Assemblies
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
A38-A41 Bias Tees” in the PDF Service Guide
1
.
The bias tee assemblies and bias cables will not be reused.
Step 11. Assemble and Install the A71 and A74 Bias Tee Combiner
Assemblies
Refer to
for this step of the procedure. New parts are listed in
1.
Assemble the 5087-7403 (x2) Bias T combiners to N5242-00050 brackets
(Ports 1 and 2) (x2) using 0515-1227 screws (x4) – (item
➀
and
➁
).
Torque to 9 in-lbs. Refer to
IMPORTANT!
This step includes disconnecting and laying aside several
gray cables. Ensure that they are labeled.
1. See
Summary of Contents for N5241BU-205
Page 59: ......
