E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A24 20 GHz Highband Coupler (Options 503, 509, 520, and 521)
3-54
A24 20 GHz Highband Coupler (Options 503, 509, 520, and 521)
Tools Required
• T–10 driver
• 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3- 29, Figure 3- 30, Figure 3- 31 or Figure 3- 32 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 assembly according to the signal generator you have.
E8257D & E8663D: Disconnect the A25 20 GHz Highband Detector from the A24 20 GHz Highband Coupler.
E8267D: Disconnect the A33 6dB PAD from the A24 20 GHz Highband Coupler.
5. Using the 5/16” open–ended wrench, disconnect the following RF cables according to the signal generator you have.
Standard:
Options 503, 509, and 520: Disconnect W74 and W24 or W133 (instruments without Option 1E1, not shown) RF
cables from the A24 20 GHz Highband Coupler’s input and output.
Option 521: Disconnect W142 and W144 RF cables from the A24 20 GHz Highband Coupler’s input and output.
Option 1EM:
Options 503, 509, and 520: Disconnect W71 and W72 RF cables from the A24 20 GHz Highband Coupler’s input
and output.
Option 521: Disconnect W143 and W147 RF cables from the A24 20 GHz Highband Coupler’s input and output.
6. Using the T–10 driver, remove the two screws that connect the A25B Highband Detector Bias Board to the A24 20
GHz Highband Coupler.
7. Using the T–10 driver, remove the two screws that attach the coupler to the side panel.
8. Remove the A24 20 GHz Highband Coupler.
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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