E8257D/67D, E8663D PSG Signal Generators Service Guide 379
Assembly Replacement
A39 Directional Sweep Coupler
A39 Directional Sweep Coupler
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-66 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to “Outer Instrument
Cover” on page 258 and “Inner Instrument Cover” on page 260.
3. Position the signal generator with the A31 Motherboard facing away from
you and the RF deck on top.
4. Using the 5/16” open–ended wrench, disconnect the following RF cables:
— W101 from A39 (IN)
— W115 from A39 (OUT)
5. Using the T–10 driver, remove the two screws that attach the A39
Directional Sweep Coupler to the A23 Lowband Coupler/Detector.
6. Remove the A39 Directional Sweep Coupler from the RF deck.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all T–10 screws to 9 in–lbs.
3. Torque all RF connectors to 8 in–lbs.
4. Perform the post–repair adjustments and performance tests that pertain
to this removal procedure.
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