91369 Service Manual 3-5
Theory
Printed Circuit Board Assemblies (PCBAs)
CPU PCBA
Note:
Refer to the list of Assembly Drawings and Schematics on page 6-4 for the complete system block
diagram.
The CPU PCBA runs the system software, updates the display, and communicates with peripheral devices
through the I/O PCBA.
It has four major subsystems (Figure 3-1):
• Power Supply
• Core Processor, including all 64-bit peripherals
• PCI subsystem, including 32-bit peripherals
• ISA subsystem, including 16-bit peripherals
Figure 3-1: CPU PCBA setup
Core processor Power supply
PCI subsystem ISA subsystem
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