326 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A25 40 GHz Highband Detector (Option 540)
A25 40 GHz Highband Detector (Option 540)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-42 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 40 GHz
Highband Detector from the A24 40 GHz Highband Coupler.
5. Using the needle–nose pliers, disconnect W15 (not shown) from the A25
40 GHz Highband Detector.
6. Remove the A25 40 GHz Highband 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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