E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A30 Modulation Filter (Standard and Option 1EA/1EU)
3-82
A30 Modulation Filter (Standard and Option 1EA/1EU)
Tools Required
• T–10 driver
• 5/16” open–ended wrench
Removal Procedure
Refer to Figure 3- 51 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 following flexible cables:
• W17 from A30J7
• W108 from A30J6 (Options (550 and 567 only)
5. Using the 5/16” open–ended wrench, disconnect the following RF cable according to the signal generator you have.
E8257D/E8663D: Disconnect the W41 RF cable from A30J1.
E8267D: Disconnect the W98 RF cable from A30J1.
6. Disconnect the W34 ribbon cable from the A30 Modulator Filter.
7. Using the 5/16” open–ended wrench, disconnect the following RF cable according to the signal generator you have.
Option 520, & 521 Standard: Disconnect the W74 RF cable from A30J2.
Option 540 Standard: Disconnect the W31 RF cable from A30J2.
Option 550/567 Standard: Disconnect the W107 RF cable from A30J2.
Option 1EM: Disconnect the W71 RF cable from A30J2.
8. Using the 5/16’ open–ended wrench, disconnect the following RF cables:
• W27 from A30J3
• W32 from A30J4
• W106 from A30J4 (Option 550/567 only)
9. Using the T–10 driver, remove the three screws (1) that attach the A30 Modulator Filter to the RF bracket.
10. Remove the A30 Modulator Filter from the RF deck.
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 to this removal procedure.
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