7-48 Service Guide E8361-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A27, A28, A29, and A30 First Converters (Mixers) and Mixer Bias Board E8361A
Removing and Replacing the A27, A28, A29, and A30
First Converters (Mixers) and Mixer Bias Board
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 7-21 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 and
Removing the Receiver Deck” on page 7-8 if necessary.
3. With a 5/16-inch torque wrench, disconnect the eight semirigid cables (item
①) and the
four flexible cables (item
②).
4. With a T-10 TORX driver, remove the four mounting screws (item
③).
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.
5. Remove the mixer bracket and disconnect the ribbon cable (item
④). Observe the
CAUTION above.
6. If replacing a first converter (mixer):
a. Remove the defective mixer from the bracket by removing the attachment screws.
b. Install the new mixer onto the bracket using the attachment screws from the mixer
that was removed.
If replacing the mixer bias board:
a. Remove all four mixers from the bracket by removing the attachment screws.
b. Remove the mixer bias board by removing the attachment screws.
c. Install the new mixer bias board onto the bracket using the attachment screws from
the mixer bias board that was removed.
d. Reinstall the four mixers using their original attachment screws.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain
to this removal procedure. Refer to Table 7-2 on page 7-66.
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