202 Chapter 4
Assembly Replacement
A22 Processor Assembly
A22 Processor Assembly
CAUTION Use ESD precautions when performing this replacement procedure.
NOTE The processor assembly consists of three separate boards: the A22 CPU
(processor) board, the A22A1 DRAM board, and the A22A2 Flash board.
Earlier instruments (serial prefix US3948 and below) also have an
A22A3 GP-IB capacitor board. The Flash memory board contains data
that is pertinent to your particular instrument. If you are changing a
faulty CPU board, you must transfer the two smaller boards over to the
new CPU board. Refer to the “A22A1 DRAM, A22A2 Flash, and A22A3
GP-IB Capacitor Boards” removal and replacement procedure. After the
boards are installed on the new processor board, refer to the procedure
in Chapter 5 for information on transferring data to the new processor.
Removal
1. Remove the instrument top brace. Refer to the “Top Brace” removal
procedure.
2. Remove the A10 assembly. Refer to the “A10 Digital IF and A12
Analog IF Assemblies” removal procedure.
3. Remove the A7 assembly (if installed). Refer to the “A7 Baseband I/Q
Assembly (Option B7C)” removal procedure.
4. Remove the A25 board. Refer to the “A25 SCSI Board” removal
procedure.
5. Using the T-10 driver, remove the 14 screws (1) from the rear panel
as shown in Figure 4-22.
6. Read the
Warning on the rear dress panel before removing the
processor assembly from the deck.
7. Refer to Figure 4-23. Use the handle (2) to slide the A22 assembly
(3) out of the deck by pulling towards the rear of the instrument.
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