E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A23 Lowband Coupler/Detector
3-52
A23 Lowband Coupler/Detector
Tools Required
• T–10 driver
• 5/16” open–ended wrench
• wire cutters
Removal Procedure
Refer to Figure 3- 28 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 so that the A31 Motherboard is facing you and the RF deck is on top.
4. Using the 5/16” open–ended wrench, disconnect the W27 RF cable from the A23 Lowband Coupler/Detector.
5. Using the wire cutters, cut the tie wrap that secures the W27 RF cable to the A23 Lowband Coupler/Detector.
6. Using the 5/16” open–ended wrench, disconnect the following RF cable according to the signal generator you have.
E8257D & E8663D: Disconnect the W37 RF cable from the A23 Lowband Coupler/Detector.
E8267D: Disconnect the W75 RF cable from the A23 Lowband Coupler/Detector.
7. Using the T–10 driver, remove the two screws that attach the A23 Lowband Coupler/Detector to the side panel.
8. Disconnect the W28 ribbon cable from the A23 Lowband Coupler/Detector (not shown in
Figure 0- 6).
9. Disconnect the W14 flexible cable from the A23 Lowband Coupler/Detector (not shown in Figure 0- 6).
10. Remove the A23 Lowband Coupler/Detector.
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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