E8257D/67D, E8663D PSG Signal Generators Service Guide 343
Assembly Replacement
A29 20 GHz Doubler
A29 20 GHz Doubler
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-51 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 you and the
RF deck on top.
4. Using the 5/16” open–ended wrench, disconnect the following RF cables:
— W39 from A29J4
— W40 from A29J3
5. Using the 5/16” open–ended wrench, disconnect the following RF cable
according to the signal generator you have.
E8257D & E8663D: Disconnect the W41 RF cable from A29J2 and the W38
RF cable from A29J1.
E8267D: Disconnect the W77 RF cable from A29J2 and the W115 RF cable
from A29J1.
6. Using the T–10 driver, remove the two screws (1) that attach the A29
20 GHz Doubler to the RF deck.
7. Disconnect the W33 ribbon cable from A29J10.
8. Remove the A29 20 GHz Doubler 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. Torque all RF connectors to 8 in–lbs.
4. Perform the post–repair adjustments and performance tests that pertain
to this removal procedure.
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