Agilent Technologies n5181a, Service Manual, Page: 150 / 202

Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Assembly Replacement
A3 RF Assembly - Standard (N5181A/82A)
3-38
A3 RF Assembly - Standard (N5181A/82A)
WARNING Do not disconnect the RF connector cable from the A3 RF assembly or the RF connector itself. Removing the cable
will result in instrument failure.
Tools Required
• T-10 driver
• 5/16” open-ended wrench
• common screwdriver
Removal Procedure
Refer to Figure 3-20 , Figure 3-21 and Figure 3-22 for this procedure.
NOTE The RF Connector bracket will need to be disconnected from the chassis before the A3 RF assembly can be removed.
NOTE Pry slots have been provided on both sides of the A3 RF assembly to aid in removing the board.
1. Go to ”Assembly Installation and Removal Overview” on page 4-2 , and complete the ”Assembly Removal and Installation Procedure”
on page 4-3 .
2. Disconnect the power cord.
3. Remove the covers from the signal generator. Refer to ”Outer Cover” on page 3-4 , ”Inner Top Cover” on page 3-6 , and ”Inner Bottom
Cover” on page 3-8 .
4. Place the signal generator flat with the A2 Vector Module facing up and the rear panel facing you (N5182A only).
5. Using the 5/16” open-ended wrench, remove the following cables W5, W6, and W7.
6. Place the signal generator flat with the A3 RF assembly facing up.
7. Remove the following assemblies, in the order listed
a. ”A4 Internal Memory Card (N5162A/82A only)” (see page 3-52 )
b. ”A5 CPU” (see page 3-54 )
c. ”Rear Panel (N5161A/81A)” (see page 3-22 ), or ”Rear Panel (N5162A/82A)” (see page 3-24 )
d. ”Front-Panel” (see page 3-10 )
8. Using the T-10 driver, remove the 10 screws (1) that connect the A3 RF assembly to the chassis.
9. Using the T-10 driver to remove the three screws (2) that connect the RF connector bracket to the chassis.
CAUTION The RF Connector can be easily damaged. Use extreme caution when disconnecting the RF connector bracket from the
instrument chassis.
10. Place the tip of a medium common screwdriver into one of the three pry slots on the A3 RF assembly and twist the screwdriver to release
the board from the connector pins, see Figure 3-22 .
11. Repeat step 10 with the other two pry slots.
12. Remove the A3 RF assembly.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all screws to 21 in–lbs.
3. Torque all BNC connectors to 8 in–lbs.
4. Perform the post-repair service procedure and performance tests that pertain to this replacement procedure, see Chapter 4, Post-Repair
Procedures and Performance Verification .
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