Assembly Replacement
A19 Power Supply
2-38
A19 Power Supply
Tools Required
• T-10 driver
• needle-nose pliers
Removal Procedure
Refer to Figure 2-18 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 and
"Inner Instrument Cover" on page 2-6.
3. Position the signal generator with the A31 Motherboard facing you.
4. Using the needle-nose pliers, disconnect the W16 flexible cable (refer to Figure 2-15 on page 2-33) from the A11
Pulse/Analog Modulation Generator J204.
5. Disconnect the W20 ribbon cable from the A20 SMI.
6. Using the T-10 driver, remove the two screws (1) that secure the A19 Power Supply to the struts located on the bottom.
7. Using the T-10 driver, remove the two additional screws (2) that are attached to the bottom frame.
8. Position the signal generator with the A31 Motherboard flat on the work surface and the rear panel facing you.
9. Remove the W18 ribbon cable from the A18 CPU J1.
10. Using the T-10 driver, remove the two screws (3) that secure the A19 Power Supply to the struts located on the top and an
additional screw (4) located on the top frame.
11. If you have Option UNJ refer to "A32 10 MHz Crystal Oscillator (Option UNJ)" on page 2-72. You must remove this
assembly before continuing to the next step.
12. Using the needle-nose pliers, disconnect A22W1 from the power supply.
13. Pull the power supply out of the chassis while guiding the A22 Line Module cable through the opening of the power
supply.
14. Remove the power supply from the signal generator’s chassis.
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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