E8257D/67D, E8663D PSG Signal Generators Service Guide 287
Assembly Replacement
A12 Pulse Modulator Board
A12 Pulse Modulator Board
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-18 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 so that the A31 Motherboard is facing you
and the RF deck is on top.
4. Using the 5/16” open–ended wrench, disconnect the W16, W75, and W76
RF cables from the A12 Pulse Modulator Board.
5. Disconnect the W69 ribbon cable from the A12 Pulse Modulator Board.
6. Using the T–10 driver, remove the two screws (1) that attach the A12
Pulse Modulator Board to the main chassis.
7. Remove the A12 Pulse Modulator Board from the RF deck.
8. Using the T–10 driver, remove the sheet metal from A12 Pulse Modulator
Board.
Replacement Procedure
— Reverse the order of the removal procedure.
— Perform the post–repair adjustments and performance tests that pertain to
this removal procedure.
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