At1 115 Db Attenuator; Tools Required; Removal Procedure; Replacement Procedure - Keysight Technologies E8257D Service Manual

Assembly Replacement

AT1 115 dB Attenuator

AT1 115 dB Attenuator

Tools Required

— T–10 driver
— 5/16" open–ended wrench

Removal Procedure

Refer to
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to
3. Position the signal generator with the A31 Motherboard facing you so that
4. Using the 5/16" open-ended wrench, disconnect the following RF cables
Cables W24, W25, W143, and W145 are easily damaged. DO NOT bend them.
Bending the cables can damage the center conductor, which could result in
power "holes".
5. Using the T–10 driver, remove the two screws (1) that attach the AT1
6. Disconnect the AT1W1 ribbon cable from A26J13.
7. Remove the attenuator from the A26 MID bracket.
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
E8257D/67D, E8663D PSG Signal Generators Service Guide
Figure 3-74 for this procedure.
Cover" on page 258 and
the RF deck is on top.
according to the signal generator you have.
Option 513, 520, 532, 540, 544 or E8257N: Disconnect W24 and W25 from
the AT1 115 dB Attenuator.
Option 521: Disconnect W143 and W145 from the AT1 115 dB Attenuator.
115 dB Attenuator to the side panel.
to this removal procedure.
"Inner Instrument Cover" on page
"Outer Instrument
260.
393