A22 Preamplifier; A27 Electronic Attenuator - Agilent Technologies PSA Series Service Manual

A22 Preamplifier

Removal
1. Refer to Figure 11-26. Remove the semi-rigid cables W48 and W50.
2. Refer to Figure 11-25. Using the T-10 driver, remove the 2 screws
(5).
3. The preamplifier assembly can now be removed from the RF section.
Replacement
1. Place the preamplifier assembly into position in the RF section.
2. Using the T-10 driver, replace the 2 screws that attach the assembly
to the bracket. Torque to 9 inch pounds.
3. Replace the semi-rigid cables to the correct locations. Torque to
10 inch pounds.

A27 Electronic Attenuator

Removal
1. Refer to Figure 11-26. Remove the semi-rigid cables W51 and W52.
2. Remove the ribbon cable from the attenuator assembly.
3. Refer to Figure 11-25. Using the T-10 driver, remove the 2 screws
(6).
4. The attenuator assembly can now be removed from the RF section.
5. To remove the attenuator assembly from the bracket, remove the
four screws on the back.
Replacement
1. If the attenuator was removed from the bracket, replace the four
screws on the back. Torque to 9 inch pounds.
2. Place the attenuator assembly into position in the RF section.
3. Using the T-10 driver, replace the 2 screws that attach the assembly
to the RF section. Torque to 9 inch pounds.
4. Replace the ribbon cable.
5. Replace the semi-rigid cables to the correct locations. Torque to
10 inch pounds.
Chapter 11
Assembly Replacement Procedures
RF Section E4446A, E4447A, E4448A
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