Technical data

7-32 Service Guide N5230-90025
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A18 MASS 26.5 (MASSQuad) N5230C
Removing and Replacing the A18 MASS 26.5 (MASSQuad)
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-20 TORX driver (set to 21 in-lb)
• 5/16 inch open-end torque wrench (set to 10 in-lb)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-13 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to “Removing the Covers” on page 7-6.
3. Remove the A17 QABC board. Refer to “Removing and Replacing the A17 QABC Board” on page 7-30.
4. Remove the A18 MASSQuad from the A17 QABC board:
a. Disconnect cables W63, W74, W75, W77, W78, and W79 from the A18 MASSQuad.
b. Remove the three mounting screws (item
①
) and remove the A18 MASSQuad from the A17 QABC
board.
Replacement Procedure
1. Reverse the order of the removal procedure. Before installing the new A18 MASSQuad, remove the two
50-ohm loads from the old A18 MASSQuad and install them on the new A18 MASSQuad.
Use the tools specified for all cable connections and mounting screws.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-58.