E8257D/67D, E8663D PSG Signal Generators Service Guide 389
Assembly Replacement
A44 Scan Modulation Bias Adapter (E8257D-520 and E8663D Only)
A44 Scan Modulation Bias Adapter (E8257D-520 and E8663D Only)
Tools Required
— needle-nose pliers
— 5/16” open–ended wrench
— T-10 driver
Removal Procedure
Refer to Figure 3-72 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 away from
you and the RF deck on top.
4. Using the needle-nose pliers, disconnect W148 from A44J2.
5. Using the 5/16” open–ended wrench, disconnect the following RF cables:
— W149 from the A44 assembly
— W150 from AM MOD BIAS
6. Using the T–10 driver, remove the two screws (1) that attach the A44 Scan
Modulation Bias Adapter and bracket to the side panel.
7. Disconnect the W151 ribbon cable from A26J33.
8. Remove the A44 Scan Modulation Bias Adapter from the RF deck.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post–repair adjustments and performance tests that pertain
to this removal procedure.
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