312 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A24 20 GHz Highband Coupler (Options 503, 509, 513, 520, and 521)
A24 20 GHz Highband Coupler
(Options 503, 509, 513, 520, and 521)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-30, Figure 3-31, Figure 3-32 or Figure 3-33 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 following assembly
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 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:
Options 503, 509, 513, and 520: Disconnect W74 and W24 or W133
(instruments without Option 1E1, not shown) RF cables from the A24 20
GHz Highband Coupler’s input and output.
Option 521: Disconnect W142 and W144 RF cables from the A24 20 GHz
Highband Coupler’s input and output.
Option 1EM:
Options 503, 509, 513, and 520: Disconnect W71 and W72 RF cables from
the A24 20 GHz Highband Coupler’s input and output.
Option 521: Disconnect W143 and W147 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.
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