Assembly Replacement
A25 20 GHz High Band Detector with A25B Detector Bias Board (E8241A and E8251A Models Only)
2-56
A25 20 GHz High Band Detector with A25B Detector Bias Board
(E8241A and E8251A Models Only)
Tools Required
• T-8 driver
• T-10 driver
• 5/16” open ended wrench
Removal Procedure
Refer to Figure 2-27 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 and
"Inner Instrument Cover" on page 2-6.
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 A25 High Band Detector from the A25 20 GHz High Band Coupler.
5. Disconnect the W30 and W24 RF cables from the A25 20 GHz High Band Coupler.
6. Disconnect the A25BW1 bias board power cable.
7. Using the T-10 driver, remove the two screws that attach the coupler to the side panel.
8. Remove the coupler with the bias board from the chassis.
9. Using the T-8 driver, remove the two screws that attach the bias board to the sheet metal.
10. Remove the bias board.
Replacement Procedure
• Reverse the order of the removal procedure.
• Torque all T-8 screws to 9 in-lbs.
• Torque all T-10 screws to 9 in-lbs.
• Torque all RF connectors to 8 in-lbs.
• Perform the post-repair adjustments and performance tests that pertain to this removal procedure.
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