E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A24 50 GHz Highband Coupler (Options 532 and 544)
3-60
A24 50 GHz Highband Coupler (Options 532 and 544)
Tools Required
• T–10 driver
• 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3- 35 and Figure 3- 36 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 A33 10dB PAD from the A24 50 GHz Highband Coupler
5. Using the 5/16” open–ended wrench, disconnect the following cables according to the signal generator you have.
Standard: Disconnect W102 and W24 or W26 (instruments without Option 1E1, not shown) RF cables from the A24
50 GHz Highband Coupler’s input and output.
Option 1EM: Disconnect W102 and W93 RF cables from the A24 50 GHz Highband Coupler’s input and output.
Option 1EM without Option 1E1: Disconnect W102 and W82 (not shown) RF cables from the A24 50 GHz Highband
Couplers input and output.
6. Using the T–10 driver, remove the two screws that connect the A25B Highband Detector Bias Board to the A24 50
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 50 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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