7-44 Service Guide E8361-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A23 and A24 SOMA 70s E8361A
Removing and Replacing the A23 and A24 SOMA 70s
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 7-20 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 as shown. It may be convenient to raise the receiver deck to
provide better access. If necessary, refer to “Raising and Removing the Receiver Deck”
on page 7-8.
3. Identify the SOMA 70 to be removed.
4. Disconnect the ribbon cable (item
①) from the appropriate SOMA 70.
5. With a 5/16-inch torque wrench, disconnect the three semirigid cables (item
②) from
the SOMA 70.
6. Remove the flexible cable (item
③) from the SOMA 70.
7. With a T-10 TORX driver, remove the four mounting screws (item
④).
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.
8. Remove the SOMA 70 from the analyzer. Observe the
CAUTION above.
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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