Diskette Drive Subsystem; Pointing Device Subsystem; Power Subsystem; Ac Power Adapter - NEC Versa 2500 Series Service Manual

3-10 Hardware Functional Overview
The built-in controller can support any industry standard 2.5-inch IDE hard disk drive at
19mm or 17mm height. Setting up the hard disk type is done automatically by the CMOS
Setup program. Setup auto-detects the installed hard disk type settings for optimized per-
formance.

DISKETTE DRIVE SUBSYSTEM

The Diskette Drive Subsystem consists of a FDD controller provided by SMC 37C665IR
and the built-in floppy disk drive. The floppy disk drive supports standard
720KB and 1.44 MB mini-diskettes.

POINTING DEVICE SUBSYSTEM

The pointing device subsystem consists of the VersaGlide device on the system top cover
assembly, and a pre-programmed Mitsubishi M38813M4 micro-controller that interfaces the
mouse device to the system board. An external PS/2 port also supports the use of an exter-
nal PS/2 compatible mouse which the system automatically detects during system power up
and then disables the internal VersaGlide.

POWER SUBSYSTEM

The Power Subsystem consists of the following major sections:
T
External AC Power Adapter
T
Internal Battery Pack
T
Power Board (on system board)
T
LCD Inverter Board (in LCD Panel Assembly)
T
Power Conservation Logic (part of system board)

AC Power Adapter

The computer is equipped with a universal AC power adapter that converts AC voltage (90
to 265VAC, 47 to 63Hz) into DC voltage used to operate the notebook and charge the
batteries.
NOTE: Do not move the notebook when the
HDD LED is activated. This protects the hard
disk drive from any accidental damage or loss of
data.
3.5-inch