Keysight Technologies N9040B UXA Signal Analyzer Service Guide 397
Assembly Replacement Procedures
RF Area - Options 544, 550
Replacement
1. Inspect the chassis where the YTF Preselector mounts and remove the gap
pad if present (see Figure 15-44, item (1). The gap pad may remain
attached to the faulty YTF Preselector.
2. Refer to Figure 15-44. Install the replacement gap pad (1) (5022-7179)
into the recess in the base of the replacement YTF Preselector (2). Peel
back one corner of the clear plastic backing on the pink side of the gap
pad. Remove the blue backing from the other side of the gap pad. Install
the gap pad as shown with the pink side exposed. Carefully peel off the
clear plastic backing and smooth the gap pad into the recess.
Figure 15-44 Gap Pad Installation
3. Refer to Figure 15-43. Place the YTF Preselector into the chassis with the
ribbon cable connector toward the rear of the instrument. Replace the four
screws (1) (0515-0372). Torque to 9 inch-pounds.
4. Figure 15-42. Replace the cables W67 and W68. Torque to
10 inch-pounds.
5. Replace the wire harness W11.
6. Replace the RF bracket, front panel, and instrument outer case as
described on page 360.
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