E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
AT1 90 dB Attenuator (Option 1EM)
3-126
AT1 90 dB Attenuator (Option 1EM)
Tools Required
• T–10 driver
• 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3- 74 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 so that the RF deck is on top.
4. Disconnect the AT1W1 ribbon cable from A26J13.
5. Using the 5/16” open–ended wrench, disconnect the W81 and W94 RF cables from the
AT1 90 dB Attenuator.
NOTE Cables W81 and W94 are easily damaged. DO NOT bend them. Bending the cables can damage the center
conductor, which could result in power "holes".
6. Using the T–10 driver, remove the two screws that attach the AT1 90 dB Attenuator to the side panel.
7. Remove the AT1 90 dB Attenuator.
8. Using the T–10 driver, remove the sheet metal from the attenuator.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all T–10 screws to 9 in–lbs.
3. Torque all RF connectors to 8 in–lbs.
4. Perform the post–repair adjustments and performance tests that pertain to this removal procedure.
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