Specifications

2-38

Assembly Replacement

A18 CPU

Tools Required

• T-10 driver

Removal Procedure

Refer to Figure 2-17 for this procedure.

1. Disconnect the power cord.

2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-5

and "Inner Instrument Cover" on page 2-7.

3. Position the signal generator with the front panel facing you.

4. Using the T-10 driver, remove the four screws from the Baseband Generator cover

(E8267C Only).

5. Disconnect the following ribbon cables:

• W19 from A18J2

• W66from A18P2

• W18 from A18J1

• W64 from A14J13

• W90 from A14J21

6. Lift the retention levers and disconnect the A18 CPU from the A31 Motherboard.

7. Lift the A18 CPU out of the slot.

Replacement Procedure

• Reverse the order of the removal procedure.

• Send command "DIAG:FILE:REST", this copies data to the CPU board.

• Perform the post-repair adjustments and performance tests that pertain to this removal

procedure.