Chapter 11 385
Assembly Replacement Procedures
A26 CPU Assembly
A26 CPU Assembly
CAUTION Use ESD precautions when performing this replacement procedure.
NOTE The CPU assembly consists of three separate boards: the A26 CPU
(processor) board, the A26A1 DRAM board, and the A26A2 Flash 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 three smaller boards over to the new CPU board.
Refer to the “A26A1 DRAM and A26A2 Flash Boards” removal and
replacement procedure. After the boards are installed on the new
processor board, refer to the procedure in Chapter 12 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 A7 Digital IF assembly. Refer to the “Vertical Board
Assemblies (Standard Instrument)” removal procedure.
3. Remove the A6 SCSI board. Refer to the “A6 SCSI Board” removal
procedure.
4. Using the T-10 driver, remove the 14 screws (1) from the rear panel
as shown in Figure 11-48.
5. Read the
Warning on the rear dress panel before removing the CPU
assembly from the deck.
6. Refer to Figure 11-49. Use the handle (2) to slide the A26 assembly
(3) out of the deck by pulling towards the rear of the instrument.
7. If you need to replace the battery, go to “Battery Replacement” on
page 387.
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