304 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A20 SMI (Source Module Interface)
A20 SMI (Source Module Interface)
Tools Required
— 5.0 mm hex–nut driver
— needle–nose pliers
Removal Procedure
Refer to Figure 3-26 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. Using the needle–nose pliers, disconnect the W55 flexible cable from the
A10 ALC J303.
4. Disconnect the W20 ribbon cable from the A26 MID J20.
5. Using the 5.0 mm driver, remove the hex screws (1) and washers that
secure the A20 SMI to the rear panel.
6. Remove the A20 SMI.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all hex screws to 9 in–lbs.
3. Perform the post–repair adjustments and performance tests that pertain
to this removal procedure.
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