E8257D/67D, E8663D PSG Signal Generators Service Guide 281
Assembly Replacement
A9 YIG Driver
A9 YIG Driver
Tools Required
— needle–nose pliers
Removal Procedure
Refer to Figure 3-15 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 front panel facing you.
4. Disconnect the W12 ribbon cable from A9J5.
5. Using the needle–nose pliers, disconnect the following flexible cables:
— W54 from A9J9
— W11 from A9J4
— W10 from A9J3
6. Lift the retention levers and disconnect the A9 YIG Driver from the A31
Motherboard.
7. Lift the A9 YIG Driver out of the slot.
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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