7-72 Service Guide E8364-90026
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A47 and A48 Couplers (Option H11) E8362B, E8363B, E8364B
Removing and Replacing the A47 and A48 Couplers
(Option H11)
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 7-34 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. Locate the coupler to be removed; the A47 RF path coupler or the A48 LO path coupler.
The A47 RF path coupler is secured to the analyzer side frame (test set deck) and the
A48 LO path coupler is secured to a bracket which also holds the A19 splitter.
4. To remove the A47 RF path coupler:
a. With a 5/16-inch wrench, disconnect the three semirigid cables from the coupler.
CAUTION
Be careful not to damage the center pins of the semirigid cables. Some flexing
of the cables is necessary for removal. Do not over-bend them.
b. With a T-10 TORX driver, remove the mounting screws holding the coupler.
5. To remove the A48 LO path coupler:
a. With a 5/16-inch wrench, disconnect the three semirigid cables from the coupler and
the three semirigid cables from the A19 splitter.
b. With a T-10 TORX driver, remove the mounting screws from the bracket that holds
the A48 LO path coupler and the A19 splitter.
6. Remove the bracket, with the A48 LO path coupler attached, from the analyzer.
Observe the
CAUTION above.
7. Remove the A48 LO path coupler from the bracket by removing the attachment screws.
Replacement Procedure
1. Reverse the order of the removal procedure using the existing cables and hardware.
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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