2-62
Assembly Replacement
A24 20 GHz Highband Coupler (Option 520 Only)
A24 20 GHz Highband Coupler (Option 520 Only)
Tools Required
• T-10 driver
• 5/16” open ended wrench
Removal Procedure
Refer to Figure 2-28 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-5
and "Inner Instrument Cover" on page 2-7.
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 following assembly according to the signal
generator you have.
E8247C/57C: Disconnect the A25 Highband Detector from the A24 20 GHz Highband Coupler.
E8267C: Disconnect the A33 6dB PAD from the A24 20 GHz Highband Coupler.
5. Using the 5/16” open ended wrench, disconnect the following RF cables according to the signal
generator you have.
Standard: Disconnect W74 and W24 RF cables from the A24 20 GHz Highband Coupler’s input
and output.
Option 1EM: Disconnect W71 and W72 RF cables from the A24 20 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 20 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 20 GHz Highband 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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