E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A12 Pulse Modulator Board
3-30
A12 Pulse Modulator Board
Tools Required
• T–10 driver
• 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3- 17 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 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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