Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 369
Assembly Replacement
A5 CPU
A5 CPU
Tools Required
—T-8 driver
Removal Procedure
Refer to Figure 15-18 and Figure 15-20 for this procedure.
1. Before replacing the A5 CPU assembly see Chapter 16, “Pre and
Post-Repair Procedures” and perform the Pre-Repair Procedures outlined
for this assembly.
2. Disconnect the power cord.
3. Remove the covers from the signal generator. Refer to “Outer Cover” on
page 336 and “Inner Bottom Cover” on page 340.
4. Place the signal generator flat and upside down with the front-panel
facing you.
5. Referring to Figure 15-19, using the T-8 driver, remove the four screws (3)
that attach the A5 CPU (1) and heatsink (2) to the A3 RF assembly.
6. Remove the A5 CPU.
7. The thermal pads (4) should also be replaced.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Recommended torque for the four CPU screws is 6 in–lbs.
3. See Chapter 16, “Pre and Post-Repair Procedures” and perform the
Post-Repair Procedures outlined for the replacement of this assembly.
There is one long pin connector attaching the A5 CPU to the A3 RF
assembly. It is located on the long end of the A5 CPU board, closest to the
center of the instrument. Use caution when removing the A5 CPU board.
There are two versions of the A5 CPU assembly. The new version requires
only one thermal pad while the old version requires two. Refer to Figure
15-18 and Figure 15-19 to determine which version is being installed,
how many thermal pads are required, and where they need to be located.
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