E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A25B Highband Detector Bias Board
3-70
A25B Highband Detector Bias Board
Tools Required
• T–10 driver
Removal Procedure
Refer to Figure 3- 44 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 away from you and the RF deck on top.
4. Disconnect the A25BW1 bias board power cable from the A26 MID J12.
5. Using the T–10 driver, remove the two screws (1) that attach the A25B Highband Detector Bias Board to the
A24 Highband Coupler.
6. Remove the A25B Highband Detector Bias Board.
Replacement Procedure
• Reverse the order of the removal procedure.
• Torque all T–10 screws to 9 in–lbs.
• Perform the post–repair adjustments and performance tests that pertain to this removal procedure.
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