7-38 Service Guide N5230-90024
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A25 and A26 60-dB Source Step Attenuators (Option 1E1) N5230C
Removing and Replacing the A25 and A26 60-dB Source Step Attenuators
(Option 1E1)
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 7-16 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6. Position the analyzer bottom side
up.
3. Identify the attenuator to be removed. To replace the attenuator, the bracket holding the attenuator must
be removed.
4. Disconnect the ribbon cable (item
①
) from the appropriate attenuator.
5. Using a 5/16-inch wrench, disconnect the RF cable (item
➁) from each end of the step attenuator.
6. With a T-10 TORX driver, remove the three mounting screws (item
③
) from the bracket holding the
attenuator.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove the assembly. Do not over-bend them.
7. Remove the bracket from the analyzer with the attenuator attached. Observe the
CAUTION above.
8. With a T-10 TORX driver, remove the mounting screws that attach the attenuator to the bracket.
Replacement Procedure
1. Reverse the order of the removal procedure using the existing attenuator ribbon cable.
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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