E8257D/67D, E8663D PSG Signal Generators Service Guide 321
Assembly Replacement
A24 67 GHz Highband Coupler (Options 550 and 567)
A24 67 GHz Highband Coupler (Options 550 and 567)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-38 and Figure 3-39 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 A25 67 GHz
Highband Detector from the
A24 67 GHz Highband Coupler.
5. Using the 5/16” open–ended wrench, disconnect the following cables
according to the signal generator you have.
Standard: Disconnect W112 and W89 RF cables from the A24 67 GHz
Highband Coupler’s input and output.
Option 1EM: Disconnect W112 and W81 RF cables from the A24 67 GHz
Highband Coupler’s input and output.
Option 1EM without Option 1E1: Disconnect W112 and W91 (not shown)
RF cables from the A24 67 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 67 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 67 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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