E8257D/67D, E8663D PSG Signal Generators Service Guide 371
Assembly Replacement
A35 3–20 GHz I/Q Modulator (E8267D Only - Standard or with Option H16/016) (Serial
Prefixes ≥ US4722/MY4722)
A35 3–20 GHz I/Q Modulator (E8267D Only - Standard or with
Option H16/016) (Serial Prefixes ≥ US4722/MY4722)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
— needle–nose pliers
Removal Procedure
Refer to Figure 3-62 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:
— W77 from A35J1
— W134 from A35 I/Q Mod
5. Using the needle–nose pliers, disconnect the following flexible cables:
— W62 from A35J7
— W63 from A35J6
— W127 from A35J109
— W128 from A35J107
— W129 from A35J108
— W130 from A35J106
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.
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