22 Installation Note N5222-90114
Installation Procedure for the Upgrade
-
Step 9. Remove Some Low Frequency Extension (LFE) Cables
(8120-5014 (x1), 8120-5021 (x1), N5240-60097 (x1), and
N5240-60098 (x1)) From the IF Multiplexer (IF MUX) Board
Disconnect the other end of the 8120-5014 (x1) and 8120-5021 (x1) cables on
the IF MUX board (items
and
). You disconnected the other ends of the IF
gray cables previously in the process in
“Step 7. Disconnect A71 and A74
Bias-Tee Combiner’s LFE Cables From the A70 Low Frequency Extension (LFE)
Board and the Ends of the LFE Cables Connected to the IF Multiplier (IF MUX)
). Refer to
.
— Save 8120-5014 cable for reuse.
— Discard 8120-5021 cable.
Figure 3
Disconnecting the gray cables on the IF MUX board (8120-5014 (x1) and
8120-5021 (x1))
IMPORTANT!
Before disconnecting the IF gray cables, be careful to label
where the cables connect on the IF multiplexer (IF MUX) board. Not all
cables are reused and some will move to new positions. See also,
.