Technical data

7-30 Service Guide N5230-90025
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A17 QABC Board N5230C
Removing and Replacing the A17 QABC Board
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 7-12 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 A12 multiplier board and the A13 fractional-N synthesizer board. Refer to “Removing and
Replacing the A12 Multiplier and the A13 Fractional-N Synthesizer Boards” on page 7-20.
4. Remove the A17 QABC board:
a. Disconnect cables W64, W65, W67. It may be necessary to loosen each of these cables at the other
end to move them out of the way to remove the A17 QABC board.
b. Disconnect flexible cables W70, W71, W72, and W73.
c. Disconnect the A29 reference switch cable at A17J10.
d. While holding cables W64, W65, and W67 out of the way, remove the A17 QABC board from the
analyzer. Be careful not to damage cables W64, W65, and W67.
5. Remove the assemblies and cables from the A17 QABC board:
a. Remove the A18 MASSQuad from the A17 QABC board. Refer to “Removing and Replacing the A18
MASS 26.5 (MASSQuad)” on page 7-32.
b. Remove the A26 step attenuator from the A17 QABC board. Refer to “Removing and Replacing the
A26 60-dB Source Step Attenuator” on page 7-42.
c. Remove cables W74 and W75 from the A17 QABC board.
d. Remove the retainer clips from cables W76 and W77 and remove cables W76 and W77 from the A17
QABC board.
Replacement Procedure
1. Reverse the order of the removal procedure, installing the assemblies and cables removed from the old
A17 QABC board onto the new A17 QABC board. Be sure to reinstall the retainer clips on cables W76
and W77 in the locations indicated.
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.