Keysight N5241BU-205, Installation Note

Page: 46 / 60

46 Installation Note N5242-90125
Description of the Upgrade
Installation Procedure for the Upgrade
-
Step 26. 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.
Step 27. Install the Front Panel Overlay and Nameplate
To see an image of the front panel overlay, keypad overlay, and power button
overlay, click the Chapter 6 bookmark “Front Panel Assembly, Front Side, All
Options” in the PDF Service Guide
1
. New parts are listed in Table 1 on page 10 .
1. Remove the protective backing from the new front panel overlay
(N5222-80016).
2. Loosely place the overlay in the recess on the front panel.
3. Placing two fingers at the middle, press the overlay firmly onto the frame
while sliding your fingers in opposite directions towards the ends of the
overlay. Repeat on all areas of the overlay.
4. Remove the protective backing and Install the nameplate. New parts are
listed in Table 1 on page 10 .
Step 26. Install the Front Panel Jumper Cables
For instructions on installing the W30 front panel jumpers, click the Chapter 7
bookmark “Removing and Replacing the Front Panel Assembly” in the PDF
Service Guide
1 .
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 gray cables installed in “Step 20. Install the New Bias Tee
Combiner’s Semirigid Test Set Cables and the Blue Cables, and
Install Cable Clamps on the Ferrite Beads” on page 36 and “Step 22.
Install the A71 and 74 bias-Tee combiner’s Gray Low Frequency
Extension (LFE) DC bias Cables and Route Cables” on page 41 are
connected correctly and not open or shorted.