Assembly Replacement
A24 20 GHz High Band Coupler (E8241A and E8251A Models Only)
2-52
A24 20 GHz High Band Coupler
(E8241A and E8251A Models Only)
Tools Required
• T-10 driver
• 5/16” open ended wrench
Removal Procedure
Refer to Figure 2-25 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 A24 High Band Detector from the A24 20 GHz High Band Coupler.
5. Using the 5/16” open ended wrench, disconnect the W30 and W24 RF cables from the A24 20 GHz High Band Coupler’s
input and output.
6. Disconnect the A25BW1 bias board power cable from the A26 MID J12.
7. Using the T-10 driver, remove the two screws (refer to Figure 2-24 on page 2-51, item 1) that attach the coupler to the side
panel.
8. Remove the A24 20 GHz High Band Coupler.
Replacement Procedure
• Reverse the order of the removal procedure.
• 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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