Agilent Technologies N5242A, Руководство по обслуживанию

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7-36 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A25–A28 Bridges and Bridge Mounting Brackets N5242A
Removing and Replacing the A25–A28 Bridges and Bridge
Mounting Brackets
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 7-17 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. Disconnect three semirigid cables (item
①
) from the bridge to be replaced.
5. Remove two screws (item
②
) from the mounting bracket of the bridge to be replaced.
6. Move the disconnected semirigid cables out of the way and lift the bridge mounting
bracket, with the bridge attached, out of 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.
7. Remove two screws that attach the bridge to be replaced to the bridge mounting
bracket, and remove the bridge from the bracket.
Replacement Procedure
1. Reverse the order of the removal procedure.
Torque all RF connectors 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 7-64 .