Removing And Replacing The A27, A28, A29, And A30 First Converters (Mixers) And Mixer Bias Board - Agilent Technologies PNA Series Service Manual

Repair and Replacement Procedures

Removing and Replacing the A27, A28, A29, and A30 First Converters (Mixers) and Mixer Bias Board

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
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
analyzer bottom side up and raise the receiver deck as shown. Refer to
Removing the Receiver Deck" on page 7-8
3. With a 5/16-inch torque wrench, disconnect the eight semirigid cables (item
four flexible cables (item
4. With a T-10 TORX driver, remove the four mounting screws (item
Be careful not to damage the center pins of the semirigid cables. Some flexing
CAUTION
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
above.
CAUTION
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
7-48
for this procedure.
"Removing the Covers" on page
②
).
Table 7-2 on page
PNA Series Microwave Network Analyzers
if necessary.
7-66.
Service Guide E8361-90001
E8361A
7-6. Position the
"Raising and
①
) and the
③
).
④
). Observe the