20 Installation Note N5222-90114
Installation Procedure for the Upgrade
-
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) Board
1.
Disconnect the (8120-5014 (x2), 8120-5017 (x1), and 8120-5021 (x1)) IF
gray cables item
through item
as shown in
. (i.e., one end is
removed in
“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” on page 22
.)
Save: 8120-5014 (x2) and 8120 (x1) for reuse.
Discard: 8120-5021.
2.
Disconnect the N5242-60078 Source 1 and N5242-60080 LO Source
cables from the LFE board as shown – (items
and
). The other end of
the N5242-60078, N5242-60079 does
not
need to be disconnected from
the Source1 and LO Source boards. Refer to
and
Figure 1
Disconnect A71 and A74 bias-T combiners new cables to the A70 LFE board
the other ends of the LFE cables to the LFE Board (8120-5014 (x2),
8120-5017 (x1), 8120-5021 (x1), N5242-60078, and N5242-60080)