E8257D/67D, E8663D PSG Signal Generators Service Guide 323
Assembly Replacement
A25 20 GHz Highband Detector (Options 503, 509, 513, 520, & 521)
A25 20 GHz Highband Detector (Options 503, 509, 513, 520, & 521)
Tools Required
— 5/16” open–ended wrench
— needle–nose pliers
Removal Procedure
Refer to Figure 3-40 or Figure 3-41 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 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.
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