E8257D/67D, E8663D PSG Signal Generators Service Guide 337
Assembly Replacement
A27 40 GHz Doubler (Option 540)
A27 40 GHz Doubler (Option 540)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-48 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 RF cables:
— Standard – W30 from A27 40 GHz Doubler or
Option 1EM – W83 from A27 40 GHz Doubler
— W31 from A27J3
— W32 from A27J1
5. Using the T–10 driver, remove the two screws that attach the A27 40 GHz
Doubler to the side panel.
6. Disconnect the W29 ribbon cable from the A27 40 GHz Doubler’s board.
7. Remove the A27 40 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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