E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A35 3–20 GHz I/Q Modulator (E8267D Only - Standard or with Option 015)
3-100
A35 3–20 GHz I/Q Modulator (E8267D Only - Standard or with Option 015)
Tools Required
• T–10 driver
• 5/16” open–ended wrench
• needle–nose pliers
Removal Procedure
Refer to Figure 3- 60 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to “Outer Instrument Cover” on page 3- 4 and “Inner
Instrument Cover” on page 3- 6.
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:
• W105 from A35J4
• W77 from A35J1
• W78 from A35 I/Q MOD
• W104 from A35J3
5. Using the needle–nose pliers, disconnect the following flexible cables:
• W62 from A35J7
• W63 from A35J6
• W79 from A35J9
• W80 from A35J106
• W97 from A35J8
6. Using the T–10 driver, remove the three screws (1) that attach the A35 I/Q MOD to the RF deck.
7. Disconnect the W70 ribbon cable from the A35 I/Q MOD.
8. Remove the A35 I/Q MOD from the RF deck.
Replacement Procedure
• Reverse the order of the removal procedure. (See the internal cover overlay for cable color codes.)
• Torque all T–10 screws to 9 in–lbs.
• Torque all RF connectors to 8 in–lbs.
• Perform the post–repair adjustments and performance tests that pertain to this removal procedure.
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