Section 1 Technical Information; Desktop System Unit - NEC PowerMate V486 Series Service Manual

Section 1
Technical Information
This manual contains information for desktop and minitower PowerMate V486 Series
systems. The information applies to all models except where indicated. Models differ pri-
marily in the chassis, CD-ROM reader, and microprocessor.
This section provides an overview of the system hardware. The basic hardware for the sys-
tem includes a system unit, mouse, and keyboard.
External interface connectors are located in the rear of the system unit and are identified in
Section 2, Setup and Operation. Jumper settings for all of the internal boards are also pro-
vided in Section 2. Appendix A provides the system unit connector pin assignments and
Appendix B provides specifications.
An overview of each of the two system units are described in the following subsections.

DESKTOP SYSTEM UNIT

The desktop chassis provides an enclosure for the system board, power supply, four storage
device slots, and four expansion slots (three ISA and one ISA/PCI Bus™). A sound board
is installed in one of the expansion slots in multimedia models. The storage device slots
accommodate a 3 1/2-inch diskette drive, a 3 1/2-inch hard disk (1-inch height), and two 5
1/4-inch storage devices (1.6-inch height). The system ships with a 3 1/2-inch diskette
drive. A 3 1/2-inch hard disk drive (540-MB or 850-MB IDE) and 5 1/4-inch CD-ROM
reader are available on various models.
The following figures show front panel features on the desktop system unit.
Figure Section 1-1 Desktop System Controls and Lamps