E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A39 Directional Sweep Coupler
3-110
A39 Directional Sweep Coupler
Tools Required
• T–10 driver
• 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3- 65 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to “Outer Instrument Cover” on page 3- 4 and “Inner
Instrument Cover” on page 3- 6.
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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