E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A25 20 GHz Highband Detector (Options 503, 509, 520, & 521)
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A25 20 GHz Highband Detector (Options 503, 509, 520, & 521)
Tools Required
• 5/16” open–ended wrench
• needle–nose pliers
Removal Procedure
Refer to Figure 3- 39 or Figure 3- 40 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 A25 20 GHz Highband Detector according to the signal
generator you have.
E8257D & E8663D: Disconnect the A25 20 GHz Highband Detector from the A24 20 GHz Highband Coupler.
E8267D: Disconnect the A25 20 GHz Highband Detector from the A33 6dB PAD.
5. Using the needle–nose pliers, disconnect W15 (not shown) from the A25 20 GHz Highband Detector.
6. Remove the A25 20 GHz Highband Detector.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post–repair adjustments and performance tests that pertain to this removal procedure.
Figure 3-39 A25 20 GHz Highband Detector (Options 503, 509, & 520)
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