7-68 Service Guide E8364-90026
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A43 and A44 35-dB Receiver Step Attenuators (Option 016) E8362B, E8363B, E8364B
Removing and Replacing the A43 and A44 35-dB Receiver
Step Attenuators (Option 016)
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 7-26 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 and raise the receiver deck as shown. Refer to “Raising the
Receiver Deck” on page 7-8 if necessary.
3. Identify the step attenuator to be removed.
4. Disconnect the ribbon cable (item
①) from the appropriate attenuator.
5. With a 5/16-inch torque wrench, disconnect the two semirigid cables (item
②) from the
attenuator.
6. With a T-10 TORX driver, remove the two mounting screws (item
③). Support the
attenuator while removing the mounting hardware.
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 the
semirigid cables.
7. Remove the attenuator from the analyzer. Observe the
CAUTION above.
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 7-80.
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