E8257D/67D, E8663D PSG Signal Generators Service Guide 385
Assembly Replacement
A42 20 GHz Power Amp (Option 521)
A42 20 GHz Power Amp (Option 521)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-70 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover from the signal generator. Refer to “Outer
Instrument Cover” on page 258.
3. Position the signal generator with the A31 Motherboard facing you and the
RF deck on top.
4. Disconnect W135 from the A42 20 GHz Power Amp board.
5. Using the 5/16” open-ended wrench, disconnect the following RF cables
according to the signal generator you have.
Standard: Disconnect W141 and W142 from the A42 20 GHz Power Amp
board.
Option 1EM: Disconnect W141 and W143 from the A42 20 GHz Power
Amp board.
6. Using the T-10 drive, remove the three screws (1) the secure the A42
20 GHz Power Amp board to the RF deck.
7. Remove the A42 20 GHz Power Amp from the RF deck.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all T–10 screws to 9 in–lbs.
3. Perform the post–repair adjustments and performance tests that pertain
to this removal procedure.
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