310 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A23 Lowband Coupler/Detector
A23 Lowband Coupler/Detector
Tools Required
— T–10 driver
— 5/16” open–ended wrench
— wire cutters
Removal Procedure
Refer to Figure 3-29 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 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 3-29).
9. Disconnect the W14 flexible cable from the A23 Lowband
Coupler/Detector (not shown in Figure 3-29).
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.
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