7-52 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A52 and A53 Option 029 Test Port Switches N5242A
Removing and Replacing the A52 and A53 Option 029
Test Port Switches
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 7-24 for this procedure.
CAUTION
Be careful not to damage the center pins of the semirigid cables. Some flexing
of the cables is necessary, but do not over-bend the semirigid cables.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6.
3. Remove the front panel assembly. Refer to “Removing and Replacing the Front Panel
Assembly” on page 7-8.
4. Position the analyzer bottom side up.
5. The test port switch, the associated source and receiver attenuator pair, the associated
bias tee, and the bracket to which they are attached, must be removed as a complete
assembly.
6. Disconnect the ribbon cables (item
①
) from the attenuators to be removed.
7. Disconnect the wire harness cable (item
②
), for the test port switch to be removed,
from the A55 noise downconverter.
8. Disconnect the semirigid cables (item
③
) from the test port switch, each associated
step attenuator, and the bias tee to be removed.
9. Disconnect two screws (item
④
) from the bias tee to be removed. Lift the bias tee, with
its wire harness attached, and place it aside.
10. Remove three screws (item
⑤
) that secure the attenuator bracket to the test set deck.
11. Move the disconnected semirigid cables out of the way and lift the attenuator bracket
out of the analyzer, with the attenuators and bias tee attached. It may be necessary to
remove additional cables, or to remove some disconnected cables completely, to remove
the attenuator bracket. If so, note the location and orientation of each for reinstallation
later.
12. Remove two screws to remove the bias tee bracket from the switch to be replaced.
13. Remove two screws to remove the test port switch to be replaced, from the mounting
bracket.
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