Installation Note N5247-90113 59
Installation Procedure for the Upgrade
Step 25. Install the New Lower Front Panel Overlay and Nameplate
Refer to
for the lower overlay and to
for the hex nuts installation for this step of the procedure. New parts
are listed in
1.
Remove the protective backing from the N5247-80028 new front panel
overlay (Option 425) or N5247-80027 (Option 425 with 029) — (item
).
2.
Starting from either side,
loosely
place the overlay in the recess on the
lower front panel, ensuring that it fits tightly against the edges of the
recess.
3.
Once the overlay is in place, press it firmly onto the frame to secure it.
4.
Reinstall all of the semirigid jumpers (item
) on the front-panel, and
tighten each of the connectors using a 5/16-in torque wrench set to
8 in-lbs. Refer to
.
5.
Remove the protective backing and Install the nameplate (N5247-80026,
item
).
Step 26. Reinstall Front Panel Jumpers
Reinstall the front panel jumper cables.
Step 27. DC Continuity Test the LFE Board and Test Ports
The DC continuity test verifies that the LFE board is installed correctly and
does not have any opens or shorts in the DC path.
1.
Using a DVM, connect one test probe to the center conductor of the RF
port 1 on the front panel.
2.
Connect the other test probe to the port 1 bias input (
BIAS 1 IN
) on the
rear panel.
3.
Verify the DVM measures
<
10
Ω
.
4.
Repeat these steps for each of the other test ports.
If the DVM value is 0
Ω
or
>
10
Ω
, then something is incorrectly installed or
there is an open or short somewhere in the LFE board/cable path:
—
Verify the cables installed in
“Step 19. Install the New Bias Tee
Combiner’s Semirigid Test Set Cables, the Blue cables, and Install
the Cable Clamps Onto the Ferrite Beads” on page 41
and
Install the A71 and 74 Bias-Tee Combiner’s Gray Low Frequency
Extension (LFE) DC Bias Cables and Route Cables” on page 51
are
connected correctly and not open or shorted.
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