7-40 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A42–A45 Bias Tees N5227A
Removing and Replacing the A42–A45 Bias Tees
Tools Required
• T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
• T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-16 for this procedure.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove the assembly. However, do not over-bend the semirigid cables.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6.
3. Position the analyzer bottom side up.
4. The bias tees and the blocks to which they are attached, must be removed as a complete assembly.
Disconnect four semirigid cables (item
①
) from the bias tee block to be removed.
5. Disconnect the wire harness cable (item
➁) from the bias tee.
6. Remove two test set deck screws (item
③
) from the bias tee block to be removed.
7. Move the disconnected semirigid cables out of the way and remove the bias tee block from the analyzer.
It may be necessary to loosen the connector at the other end of some of the semirigid cables to allow
them to be moved enough.
8. Remove two screws from the bias tee in order to remove it from the bias tee block.
Replacement Procedure
1. Reverse the order of the removal procedure.
Orient the position of the bias tees and block as shown in Figure 7-17.
Torque all cable connections to 10 in-lbs.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-54.
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