E8257D/67D, E8663D PSG Signal Generators Service Guide 397
Assembly Replacement
AT1 115 dB Attenuator (Option 1EM)
AT1 115 dB Attenuator (Option 1EM)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3-76 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 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 following RF cables
according to the signal generator you have.
Options 503, 509, 513, 520, and 540: Disconnect the W72 and W73 RF
cables from the AT1 115 dB Attenuator.
Option 521: Disconnect the W146 and W147 RF cables from the AT1
115 dB Attenuator
Options 532 and 544: Disconnect the W93 and W85 RF cables from the
AT1 115 dB Attenuator.
6. Using the T–10 driver, remove the two screws that attach the AT1 115 dB
Attenuator to the side panel.
7. Remove the AT1 115 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.
Cables W72, W73, W85, W93, W146, and W147 are easily damaged. DO NOT
bend them. Bending the cables can damage the center conductor, which could
result in power “holes”.
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