NEC Versa 2400 Series Service Manual page 5

Section 3 Hardware Functional Overview
Functional Block Diagram............................................................................................ 3-2
System BIOS ............................................................................................................... 3-3
System Processor.................................................................................................. 3-3
Major Functional Blocks ....................................................................................... 3-3
System Logic Controller .............................................................................................. 3-4
Memory Subsystem...................................................................................................... 3-6
DRAM Memory.................................................................................................... 3-6
ROM Memory ...................................................................................................... 3-6
I/O Subsystem ............................................................................................................. 3-6
Video Subsystem ......................................................................................................... 3-7
Video Chipset Controller ...................................................................................... 3-7
External VGA Capability....................................................................................... 3-8
Keyboard Subsystem.................................................................................................... 3-8
PCMCIA Controller and Sockets ................................................................................. 3-9
Hard Disk Subsystem................................................................................................... 3-10
Floppy Disk Drive Subsystem ...................................................................................... 3-10
Pointing Device Subsystem .......................................................................................... 3-10
Power Subsystem......................................................................................................... 3-10
AC Power Adapter ............................................................................................... 3-11
Internal Battery Pack ............................................................................................ 3-11
Powerboard .......................................................................................................... 3-11
LCD Inverter Board Assembly .............................................................................. 3-11
Section 4 Field Service Guidelines
Preventive Maintenance ............................................................................................... 4-1
Cleaning the Notebook's Exterior ......................................................................... 4-1
Cleaning the Notebook's Interior .......................................................................... 4-2
Protecting the Disk Drives .................................................................................... 4-2
Handling the Computer Battery Packs................................................................... 4-2
Maintaining the LCD Quality ................................................................................ 4-3
Required Tools and Equipment .................................................................................... 4-3
Parts Removal and Replacement Procedures ................................................................ 4-4
Removing/Replacing the Notebook Battery Pack .................................................. 4-4
Removing/Replacing the Hard Disk Drive Module ................................................ 4-5
Removing/Replacing the Floppy Disk Drive Module ............................................. 4-5
Removing/Replacing the LCD Status Bar Cover and Hinges ................................. 4-6
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