NEC Versa 2500 Series Service Manual
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NEC Versa 2500 Series Service Manual

NEC Versa 2500 Series Service Manual

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PROPRIETARY NOTICE AND LIABILITY DISCLAIMER
The information disclosed in this document, including all designs and related materials, is
the valuable property of NEC Computer Systems Division, Packard Bell NEC, Inc.
(NECCSD, PBNEC) and/or its licensors. NECCSD and/or its licensors, as appropriate, re-
serve all patent, copyright and other proprietary rights to this document, including all de-
sign, manufacturing, reproduction, use, and sales rights thereto, except to the extent said
rights are expressly granted to others.
The NECCSD product(s) discussed in this document are warranted in accordance with the
terms of the Warranty Statement accompanying each product. However, actual
performance of each such product is dependent upon factors such as system configuration,
customer data, and operator control. Since implementation by customers of each product
may vary, the suitability of specific product configurations and applications must be
determined by the customer and is not warranted by NECCSD.
To allow for design and specification improvements, the information in this document is
subject to change at any time, without notice. Reproduction of this document or portions
thereof without prior written approval of NECCSD is prohibited.
NEC is a registered trademark of NEC Corporation;
Versa is a U.S. registered trademark of NEC Technologies, Inc.;
all are used under license by NEC Computer Systems Division (NECCSD), Packard Bell NEC, Inc.
All other product, brand, or trade names used in this publication are the trademarks or registered
trademarks of their respective trademark owners.
First Printing — March 1997
Copyright 1997
NEC Computer Systems Division, Packard Bell NEC, Inc.
1414 Massachusetts Avenue
Boxborough, MA 01719
All Rights Reserved

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  • Page 1 Versa is a U.S. registered trademark of NEC Technologies, Inc.; all are used under license by NEC Computer Systems Division (NECCSD), Packard Bell NEC, Inc. All other product, brand, or trade names used in this publication are the trademarks or registered trademarks of their respective trademark owners.

  • Page 2: Preface

    2500 Series notebook computer. It also provides hardware and interface information for users who need an overview of the system’s design. The manual is written for NEC-trained customer engineers, system analysts, service center personnel, and dealers. The manual is organized as follows:...

  • Page 3: Table Of Contents

    Contents Preface......................... Abbreviations....................... xiii Section 1 Introduction Feature Highlights......................1-2 System Configuration....................1-3 Quick Tour of the Notebook..................1-4 Main Components....................1-4 Color LCD Display Panel................1-4 Power Switch/LCD Cover Switch ..............1-4 Status Panel and Power Indicator ..............1-4 Keyboard .......................1-5 VersaGlide.....................1-6 Memory Slot Compartment................1-7 The Right Side of the Notebook................1-7 Built-In Disk Drive..................1-7 PC Card Slot Compartment................1-7 Hard Disk Drive Compartment...............1-8...
  • Page 4 Contents System BIOS Upgrade Procedure ................1-20 Section 2 General Specifications Product Mix.........................2-6 System Board Specifications ..................2-7 Transfer Board Specifications ..................2-8 Converter Board Specifications..................2-8 LED Indicator Board Specifications................2-9 I/O Board Specifications ....................2-10 LCD Inverter Board Specifications ................2-12 LED Status Indicators Specifications ................2-13 Diskette Drive Specifications ..................2-13 HDD Unit Specifications....................2-14 CD-ROM Specifications ....................2-14...
  • Page 5 Removing/Replacing the LCD Status Bar Cover and Hinges .........4-6 Removing/Replacing the Keyboard................4-7 Removing/Replacing the Heat Plate...............4-7 Removing/Replacing the CPU ................4-7 Removing/Replacing the Cover-Display LCD Assembly Module ......4-8 Removing/Replacing the System Top Cover Assembly and the NEC VersaGlide Assembly......................4-8 Removing/Replacing the LED Board..............4-9...
  • Page 6 Video Modes VGA Standard Modes....................A-1 VGA Extended Modes....................A-3 VGA High Refresh Modes ...................A-5 List of Figures NEC Versa 2500 Series Notebook ..............1-1 System Configuration Diagram............... 1-3 Standard Keyboard Layout................1-5 VersaGlide..................... 1-6 Memory Slot Compartment................1-7 Inserting a PC Card..................1-8 Removing the Battery Pack................
  • Page 7 The LED Board Module Assembly..............4-10 The System Board and I/O Board..............4-11 The I/O Board Module Assembly ..............4-12 Power Board Module Assembly ..............4-12 NEC Versa 2500 Series Illustrated Parts Breakdown........4-15 List of Tables Model Configurations ..................1-1 Feature Highlights..................1-2 Fn Key Combination Summary...............
  • Page 8 2-26 Shock Specifications ..................2-22 2-27 Electro-Static Discharge (ESD) Specifications ..........2-23 NEC Versa 2500 Series Field-Replaceable Parts..........4-13 Packaging and Documentation Part Numbers ..........4-16 NEC Service and Information Telephone Numbers......... 5-1 POST Error Messages..................5-4 BIOS Informational Messages................ 5-7 Run-time Error Messages................
  • Page 9 Contents A-13 VGA High Refresh Modes (Packed Pixel Mode) ..........A-5 A-14 VGA High Refresh Modes (Planar Mode) ............A-5 A-15 VGA High Refresh Modes (Packed Pixel Mode) ..........A-5...
  • Page 10 This product is in conformity with the protection requirements of EC Council Directive 89/336/EEC on the approximation of laws of the Member States relating to electro-magnetic compatibility. This product satisfied the Class B limits of EN 55022. NEC Computer Systems Division, Packard Bell NEC, Inc. 1414 Massachusetts Avenue...

  • Page 11: Abbreviations

    xiii Abbreviations ampere disk operating system alternating current DRAM dynamic RAM advanced technology data terminal equipment (IBM PC) error checking and correction Bulletin Board System error detecting system binary-coded decimal Enhanced Graphics Adapter BIOS Customized Utility Expanded Memory BIOS basic input/output system Specification binary digit enhanced parallel port...
  • Page 12 Abbreviations Interrupt Request register printed circuit board Industry Standard Architecture plastic flat package In Service register parallel input/output input/output pixel picture element integrated peripheral controller PJQFP plastic J-lead quad flat pack inches per second PLCC plastic lead chip carrier interrupt request phase lock loop kilo (1024) peak-to-peak...
  • Page 13 Abbreviations UART universal asynchronous receiver/transmitter volt volts, direct current VESA video electronics standards association variable frequency oscillator Video Graphics Array VLSI very large-scale integration VRAM virtual RAM watt microfarad microprocessor microsecond...

  • Page 14: Introduction

    Section 1 Introduction This section focuses on providing outline features and operations of the NEC Versa 2500 Series Notebook Computer, including the BIOS Setup program. (Refer to the User’s Guide for more information on operating the notebook.) The NEC Versa 2500 Series of note- books are lightweight, compact, and fully IBM compatible.

  • Page 15: Feature Highlights

    Introduction FEATURE HIGHLIGHTS The NEC Versa 2500 Series notebook includes a variety of innovative features designed to meet the most demanding computing requirements Table 1-2 Feature Highlights Features Description Intel P54CSLM-133 MHz processor with internal 16 KB cache memory and math coprocessor...

  • Page 16: System Configuration

    Introduction SYSTEM CONFIGURATION The following diagram shows the NEC Versa 2500 Series system configuration. INTEL P54CSLM(TCP) C P U Cache RAM Color LCD L2: 256KB (800x600) write back D S T N VL Bus External B I O S Controller...

  • Page 17: Quick Tour Of The Notebook

    Main Components This section describes the main features of the NEC Versa 2500 Series computer. Color LCD Display Panel The notebook has a built-in 12.1 inch passive matrix dual scan DSTN color liquid crystal display (LCD) which you can adjust and tilt to your desired viewing position.

  • Page 18: Keyboard

    Introduction Keyboard The notebook has a built-in 87/88-key keyboard that provides complete emulation of a full- sized IBM AT-enhanced keyboard with function keys and screen/cursor control keys. Figure 1-3 Standard Keyboard Layout The notebook keyboard includes an embedded numeric keypad, and some special function keys that are activated by pressing the Fn key together with another key.

  • Page 19: Versaglide

    Introduction Table 1-3 Fn Key Combination Summary (cont’d) Key Combination Function This key combination toggles the LCD display backlighting (CCFT) Fn key + F11 key on and off. Fn key + right key This key combination increases the contrast level. Fn key + left key This key combination decrease the contrast level.

  • Page 20: Memory Slot Compartment

    Figure 1-5 Memory Slot Compartment The Right Side of the Notebook This section describes the features on the right side of the NEC Versa 2500 computer. Built-in Disk Drive The disk drive, which supports 3.5-inch 1.44 MB high density (HD) diskettes or 720 KB double-sided (DS) diskettes is on the right-front side of the notebook.

  • Page 21: Hard Disk Drive Compartment

    The system BIOS also includes Auto IDE detection and LBA mode for easy installa- tion as well as later upgrades for higher capacity disk drives. Front of the Notebook This section describes the features on the front side of the NEC Versa 2500 Series com- puter. Battery Compartment The battery compartment is in the left front corner of the notebook.

  • Page 22: Left Side Of The Notebook

    Introduction Figure 1-7 Removing the Battery Pack Left Side of the Notebook The following details the left side of the NEC Versa 2500 Series computer. DC-IN Connector Power Switch Reset Switch Figure 1-8 Left Side of the Notebook DC-IN Connector Jack The NEC Versa 2500 series provides a universal auto-switching AC adapter which con- nects the AC power cord into the power outlet.

  • Page 23: Hardware Reset Switch

    To the right of the AC adapter connector jack, you will notice a small hole which allows an easy alternative to resetting the notebook’s hardware. The Rear of the Notebook The following details the rear side of the NEC Versa 2500 Series computer. IR Port Ext. K/B and...

  • Page 24: Vga Port

    VGA port supports resolutions up to 1024x768 at 256 colors. The NEC Versa 2500 Series provides a VGA VESA driver diskette for installing different display resolution drivers for Windows Setup. You can also toggle the display between the LCD and the external monitor by pressing the Fn key + F10 key combination.

  • Page 25: Printer Port

    1-12 Introduction Printer Port The 25-pin printer port provides a parallel interface to connect a parallel printer or pocket network adapter. Many operating systems and software applications refer to this port as LPT1. You can run the BIOS Setup program to change the configuration of the parallel port to Standard or Bi-directional.

  • Page 26: Battery Module Handle And Lock

    Introduction 1-13 Figure 1-15 Bottom View of the Notebook The following describes the bottom of the NEC Versa 2500 Series computer. Battery Module Handle and Lock To release the battery module from its compartment, push the battery compartment latch as indicated by the arrow marked on it.

  • Page 27: System Bios Setup Program

    This section provides the outline features and operation of the Phoenix BIOS Setup pro- gram used in the NEC Versa 2500 Series. The BIOS (Basic Input-Output System) Setup program allows you to change the system configuration settings such as the current date and time, the disk drive and ports settings, and the power management as well.

  • Page 28: Boot Main Setup Menu

    This field reports the amount of extended memory found by the BIOS during POST. The value displayed is the amount of the memory address map. Because all models in the NEC Versa 2500 Series have a minimum of 16 MB of memory as the standard configuration, this value should not be less than 7168 KB.

  • Page 29: Boot Setup Peripherals Menu

    1-16 Introduction Table 1-4 Boot Main Setup Menu (cont’d) Item Function POST Errors This options allow the system to pause and display the error message at boot attempt. Keyboard Features Selects keyboard options. Num Lock This option toggles the Num Lock key on or off. Keyboard Repeat This option allows you to select the auto-repeat key speed.

  • Page 30: Boot Setup Security Menu

    Introduction 1-17 Table 1-6 Boot Setup Security Menu Item Function This option allows you to limit access to the computer through Password the use of a password. If you select this option, a pop-up win- dow appears asking you to set or change the password. A password can be up to seven characters in length, and is cleared by eliminating the password with the F1 key.

  • Page 31: Boot Setup Power Savings Menu

    1-18 Introduction Table 1-7 Boot Setup Power Savings Menu Item Function Power Saving This option allows you to enable or disable power manage- ment. Select , all other power management settings are ig- Disabled nored and disabled as well. Select , the power management is disabled Disabled ON AC only when the computer is powered by the AC adapter, but...

  • Page 32: System Upgrades

    This feature does not apply to PC card port modems. SYSTEM UPGRADES The NEC Versa notebook is easily upgradable to a higher capacity hard drive. In addition, you can add an optional second memory modules to increase the system memory to as much as 48 MB.

  • Page 33: System Bios Upgrade Procedure

    SYSTEM BIOS UPGRADE PROCEDURE The NEC Versa 2500 Series supports the EPROM Flash BIOS that allows you to easily update the system BIOS using the Flash Programming utility program called “PHLASH.COM & PLATFORM.BIN ”.
  • Page 34 Introduction 1-21 Copy the PHLASH.COM & PLATFORM.BIN BIOS utility program and the BIOS ROM file to the hard disk subdirectory. You can also choose to run the program from the diskette. Disable EMM386 or other memory manager programs before restarting the com- puter.

  • Page 35: General Specifications

    Section 2 General Specifications The following table lists NEC Versa 2500 Series system specifications. Table 2-1 NEC Versa 2500 Series Specifications ITEM SPECIFICATION Pentium P54CSLM-133 MHz TCP Package System RAM 16 MB On-board Upgradeable to 48 MB Memory Modules: 8 MB/16 MB/32 MB...
  • Page 36 General Specifications Table 2-1 NEC Versa 2500 Series Specifications (cont’d) ITEM SPECIFICATION CD-ROM Reader Removable CD-ROM Reader 8x speed Diskette Drive Removable Diskette Drive 720KB/1.44 MB Mode Support (Overseas version) Display 12.1” DSTN Color LCD Module: 800 x 600 in 256 colors...
  • Page 37 General Specifications Table 2-1 NEC Versa 2500 Series Specifications (cont’d) ITEM SPECIFICATION HotKey Fn + F8 = PC Beep Mute Operation Fn + Esc = Suspend Control Fn + <Right Arrow> = Contrast Up Fn + <Left Arrow> = Contrast Down Fn + <Up>...
  • Page 38 General Specifications Table 2-1 NEC Versa 2500 Series Specifications (cont’d) ITEM SPECIFICATION Audio Support external Stereo Headphone Jack Support external Stereo Line-In Jack Support external MIC. Jack Two Built-in speakers Built in microphone Status Indicator LED Display External LED Power On & Battery Low (Blinking)
  • Page 39 General Specifications Table 2-1 NEC Versa 2500 Series Specifications (cont’d) ITEM SPECIFICATION Key Components 12.1” Color DSTN SVGA LCD: EDMGR68KBF (Panasonic) CD-ROM: CDR-38E-900 Hard Disk Drive: 1.4 GB MK1401MAV (Toshiba) Diskette Drive: NEC FD1238H Keyboard: 87/88 Key Full Size (Windows 95)

  • Page 40: Product Mix

    SPECIFICATION Flash ROM: AMD AM29F002T PWM Controller: MAXIM MAX797 MOSFET: NS 9410 & 9953 AC Adapter PRODUCT MIX The following table lists the NEC Versa 2500 Series product mix. Table 2-2 Product Mix Versa 2500) ® Intel Pentium/133 MHz, P54CSLM(TCP)

  • Page 41: System Board Specifications

    General Specifications SYSTEM BOARD SPECIFICATIONS The following table lists system board specifications. Table 2-3 Main Board Specifications ITEM SPECIFICATION NS Clock Buffer CGS74CT 2524 Clock PGA Socket Cache 256KB, L2 DRAM 1M x 16-bit DRAM x 4 Video RAM 256K x 16-bit DRAM (5V / 60ns), SOJ x 2 System Chipset UMC UM8891BN, 208 Pin, PQFP UMC UM8892BN, 208 Pin, PQFP...

  • Page 42: Transfer Board Specifications

    General Specifications TRANSFER BOARD SPECIFICATIONS The following table lists Transfer board specifications. Table 2-4 Transfer Board Specifications ITEM SPECIFICATION Internal Connector To FDD: 100 Pin, AMP To second battery 100 Pin, AMP Thickness: 1.2mm Layers: 4 CONVERTER BOARD SPECIFICATIONS The following table lists Converter board specifications. Table 2-5 Converter Board Specifications ITEM SPECIFICATION...

  • Page 43: Led Indicator Board Specifications

    General Specifications LED INDICATOR BOARD SPECIFICATIONS The following table lists LED indicator board specifications. Table 2-6 LED Indicator Board Specifications ITEM SPECIFICATION Internal Connector To System PCB 50 Pin, Suyin To System PCB 40 Pin, Suyin To LCD Panel 50 Pin, KEL To Inverter 8 Pin, Molex To Left Speaker...

  • Page 44: I/O Board Specifications

    2-10 General Specifications I/O BOARD SPECIFICATIONS The following table lists I/O board specifications. Table 2-7 I/O Board Specifications ITEM SPECIFICATIONS Clock Crystal 14.318 MHz, DIP Type Crystal 32.768KHz, DIP Type Crystal 4 MHz, DIP Type Generator: AV9154-43, SOP 16 Pin Buffer: CGS74CT2524 Flash ROM for BIOS...
  • Page 45 General Specifications 2-11 Table 2-7 I/O Board Specifications (cont’d) ITEM SPECIFICATIONS Internal Connector To System PCB 100 Pin, AMP To System PCB 100 Pin, AMP To HDD Unit 50 Pin, KEL To CD ROM Unit 40 Pin, KEL To RTC Battery 2 Pin, Molex To Transfer PCB 40 Pin, Suyin...

  • Page 46: Lcd Inverter Board Specifications

    2-12 General Specifications LCD INVERTER BOARD SPECIFICATIONS The following table lists LCD inverter board specifications. Table 2-8 LCD Inverter Board Specifications ITEM Specification Color Inverter Panasonic 12.1” DSTN LMG9980ZWC Input Voltage 8V to 20V Output Voltage 500VAC Max. Contrast Voltage 28V ~ 31V 6mA (Max.) Output Load Current...

  • Page 47: Led Status Indicators Specifications

    General Specifications 2-13 LED STATUS INDICATORS The following table lists NEC Versa 2500 Series LEDs. For example, the AC IN LED lights to indicate power is on and that the battery is charging. Table 2-9 Status LED Descriptions ITEM PMU Enabled...

  • Page 48: Hdd Unit Specifications

    2-14 General Specifications HDD UNIT SPECIFICATIONS The following table lists the standard hard drive specifications. Table 2-11 Hard Disk Drive Specifications ITEM SPECIFICATION Module 2.5” Removable HDD Module Capacity 1.4 GB Interface Enhanced IDE Interface Unit Size 100mm (L) x 70mm (W) x 12.7mm (H) CD-ROM SPECIFICATIONS The following table lists the standard CD-ROM reader specifications.

  • Page 49: Dc/Dc Converter & Battery Charger Specifications

    General Specifications 2-15 DC/DC CONVERTER & BATTERY CHARGER SPECIFICATIONS The following table lists DC/DC converter & battery charger specifications. Table 2-14 DC/DC Converter & Battery Charger Specifications ITEM SPECIFICATION Input Voltage 6V -> 19V Output Voltage 12V, 5V, 3.3V Output Current 0.1A, 2.5A, 2.5A Output Ripple 150mV, 100mV, 100mV...

  • Page 50: Keyboard Specifications

    2-16 General Specifications KEYBOARD SPECIFICATIONS The following table lists keyboard specifications. Table 2-16 Keyboard Specifications ITEM SPECIFICATION Key Switch Type Membrane Key Stroke 0.5mm Operating Force 20GF Key Pitch 19.05mm AC/DC ADAPTER SPECIFICATIONS The following table lists AC/DC adapter specifications. Table 2-17 AC/DC Adapter Specifications ITEM SPECIFICATION...

  • Page 51: Bios Specifications

    General Specifications 2-17 BIOS SPECIFICATIONS The following table lists BIOS specifications. Table 2-18 BIOS Specifications ITEM Specification Floppy Disk Drive Support standard 3.5” FDD Support 720KB and 1.44 MB Modes Hard Disk Drive Support Standard IDE Hard Disk Auto-detect IDE Features Support LBA mode for larger capacity VGA Display Use Chips OC65548 VGA BIOS to support Monitor Sense or Auto...

  • Page 52: Micro-Controller Function Description

    2-18 General Specifications Table 2-18 BIOS Specifications (cont’d) ITEM Specification Suspend (To RAM) STR can be invoked by Hot-Key, Cover-Switch, Battery Low-Low Condition, & Operating System request STR can be resumed by Keyboard & Power button Save To Disk STD can be invoked by Hot-Key, Cover-Switch, Battery Low condition &...

  • Page 53: Power Management Features (Mode Definition)

    General Specifications 2-19 POWER MANAGEMENT FEATURES (MODE DEFINITION) The following table lists power management specifications. Table 2-20 Power Management Modes Mode Device Speed Full-On Mode CPU State Full speed Peripherals State Normal Doze Mode Timer On / Off CPU State Stop Grant State DRAM State Slow Refresh...

  • Page 54: Power Management Features (Mode Transition)

    2-20 General Specifications Table 2-20 Power Management Modes Mode Device Speed Suspend To Disk Timer Off/1/2/4/8/16 Min CPU State Power System Power-On Group Micro-Controller Activity Events Power Switch Battery Low CPU State CPU Clock/2 Condition LCD State Battery Low / Low CPU State Condition System Power...

  • Page 55: Hot Key Definition

    General Specifications 2-21 Fully-On Activity Events Occur Suspend Mode Time-Out Battery Low - Low Condition Resume Events Occur HOT KEY DEFINITION The following table lists hot key definitions. Table 2-22 Hot Keys FUNCTION KEY CONTENT Fn + Esc Suspend Fn + F10 LCD/CRT/SIMUL.

  • Page 56: Power Source Specifications

    2-22 General Specifications POWER SOURCE SPECIFICATIONS The following table lists system power specifications. Table 2-24 Power Specifications Input Nominal Version AC Voltage 100 ~ 250 V 90 ~ 265 V AC Frequency 50 / 60 Hz 47 ~ 63 Hz VIBRATION SPECIFICATIONS The following table lists vibration specifications.

  • Page 57: Electro-Static Discharge (Esd) Specifications

    General Specifications 2-23 ELECTRO-STATIC DISCHARGE (ESD) SPECIFICATIONS The following table lists static discharge specifications. Table 2-27 Electro-Static Discharge Specifications ITEM SPECIFICATION Contact Discharge 2, 4, 8, 12.5, 15 kV Air Discharge 2, 4, 15 kV 2, 4 kV 2, 4 kV...

  • Page 58: Hardware Functional Overview

    Section 3 Hardware Functional Overview The NEC Versa 2500 Series notebooks consist of several major functions and subsystems including: system BIOS – implemented on the system board and Flash ROM system processor – implemented on the system board system logic controller – implemented on the I/O Board memory subsystem –...

  • Page 59: Functional Block Diagram

    Hardware Functional Overview FUNCTIONAL BLOCK DIAGRAM The following figure shows the NEC Versa 2500 Series functional diagram. FLASH BIOS 256KB C A R D 0 PCMCIA Bank 0 O M E G A 82C094 (on-board) C A R D 1...

  • Page 60: System Processor

    Hardware Functional Overview The NEC Versa 2500 Series uses the Phoenix BIOS. The BIOS Setup program is an easy- to-use system utility configuration that sets system parameters and copies them on the Flash ROM chip with the system BIOS. The Flash ROM chip also includes BIOS Power-On Self Test (POST) diagnostic and boot- ing codes that tests the system components, initializes certain data structures, and boots the operating system.

  • Page 61: System Logic Controller

    Hardware Functional Overview When external memory access is required, the physical address is calculated by the Memory Management Unit and then passed to the Bus Interface Unit (BIU). The BIU provides the interface between the external system board and the processor’s internal execution and cache units.
  • Page 62 Hardware Functional Overview On-board Memory up to 48 MB Supports Three Memory Banks Supports Page Mode/Burst Mode Operation Supports 512KBx8, 1Mx4, 1Mx16, 2Mx8 and 4Mx4 type DRAM Supports 8 or 16 bit ROM configuration Programmable DRAM timing for each bank Power Management Supports up to Ten Programmable PMC Outputs Supports Multiple Power Saving Mode...

  • Page 63: Memory Subsystem

    EDO small-outline DIMM memory modules. (Refer to Chapter 1 on System Upgrades to know more about how to upgrade the system memory). ROM Memory The NEC Versa 2500 Series notebooks contains both the main system BIOS and the VGA BIOS with Shadow BIOS capability. I/O SUBSYSTEM The I/O Subsystem of the notebook is implemented on the I/O Board using the NS PC87336VLJ chipset.

  • Page 64: Video Subsystem

    Hardware Functional Overview VIDEO SUBSYSTEM The video subsystem, implemented on the system board and on the LCD Panel, controls the display output to both the LED Panel and to the external VGA port. The video subsystem utilizes the C&T 65548 High Performance Flat Panel / CRT VGA Controller.

  • Page 65: External Vga Capability

    LCD and the external CRT monitor. The notebook provides external resolution of 1024x768 by 256 colors for the NEC Versa 2500 series with 1 MB video memory. The NEC Versa 2500 Series can also provide simultaneous display at 800x600 at 256 colors with the standard VGA DSTN LCD.

  • Page 66: Pcmcia Controller And Sockets

    The NEC Versa 2500 Series notebook is equipped with a high capacity 1.4 GB hard disk drive that provides LBA (Logical Block Addressing) mode support. The I/O subsystem...

  • Page 67: Diskette Drive Subsystem

    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.

  • Page 68: Internal Battery Pack

    Hardware Functional Overview 3-11 Internal Battery Pack The NEC Versa 2500 Series notebooks utilizes NiMH (Nickel Metal-Hydride) that pro- vides DC power for the notebook The battery pack contains ten size A battery cells that provide the system with 12V. When installed in the notebook, the battery LED automatically appears and will also start to re- charge whenever the AC adapter is connected to the notebook.

  • Page 69: Field Service Guidelines

    Section 4 Field Service Guidelines This section contains preventive and corrective maintenance procedures for the NEC Versa 2500 Series notebook computers. The first part of this section describes the computer cleaning procedures and preferred handling procedures for sensitive components (i.e., disk drives, batteries).

  • Page 70: Cleaning The Notebook's Interior

    Field Service Guidelines Cleaning the Notebook’s Interior When servicing the inside of the notebook to remove dust and other foreign particles pro- ceed as follows: Remove the top cover, hinge covers, status bar, and keyboard using the disas- sembly procedures discussed later. Dust or vacuum (with a rubber-tipped nozzle) the inside of the system unit, par- ticularly the system board surface.

  • Page 71: Maintaining The Lcd Quality

    Leaving the computer cover open for about ten minutes while the heat disperses eliminates this potentially damag- ing situation. REQUIRED TOOLS AND EQUIPMENT All NEC Versa 2500 Series corrective maintenance procedures can be performed using the following tools: tweezers small flat-blade screwdriver small Phillips screwdriver small Hex-bolt screwdriver.

  • Page 72: Parts Removal And Replacement Procedures

    PARTS REMOVAL AND REPLACEMENT PROCEDURES This section contains field service-level removal/replacement procedures for the notebook. Refer to the exploded diagram later in this section to identify all relevant parts. The NEC Versa notebook is designed for optimum modularity in order to make field replacement maintenance easy and efficient.

  • Page 73: Removing/Replacing The Hard Disk Drive Module

    Field Service Guidelines Removing/Replacing the Hard Disk Drive Module The procedure for removing and replacing the hard disk drive module is as follows: Turn off the computer. Close the LCD cover and turn the whole unit over. You will find a clamp latch (lock knob) that secures the hard disk drive module to the system unit.

  • Page 74: Removing/Replacing The Lcd Status Bar Cover And Hinges

    Field Service Guidelines To replace the diskette drive, remove the four flat screws attaching it to the null diskette assembly , two attaching the diskette cover and remove the diskette drive cable. To replace the diskette drive unit, remove the four small screws attaching it to the null diskette drive assembly and remove the diskette drive cable.

  • Page 75: Removing/Replacing The Keyboard

    Field Service Guidelines Removing/Replacing the Keyboard The procedure for removing and replacing the keyboard is as follows: Turn off the computer. Follow all disassembly procedures mentioned from the start of this section. Lift the keyboard out and tilt the upper edge of the keyboard towards you, but do not lift the keyboard away.

  • Page 76: Removing/Replacing The Cover-Display Lcd Assembly Module

    Lift the Cover-Display LCD Assembly Module from off of the unit and set aside. To remount the Cover-Display LCD Assembly Module, reverse the disassembly procedure mentioned above. Removing/Replacing the System Top Cover Assembly and the NEC VersaGlide Assembly The procedure for removing and replacing the system top cover assembly and VersaGlide is...

  • Page 77: Removing/Replacing The Led Board

    Field Service Guidelines Turn off the computer and remove the Battery, Hard Disk Drive, and Diskette Drive Modules. Follow all disassembly procedures mentioned from the start of this section. Turn the System Unit upside down with the bottom facing up. Remove the nine screws securing the base unit assembly from the top unit assembly.

  • Page 78: Removing/Replacing The System Board And I/O Board

    4-10 Field Service Guidelines Remove the two screws and lift the board carefully out of the connections to the system board. Figure 4-3 The LED Board Module Assembly Removing/Replacing the System Board and I/O Board The system board and the I/O board are assembled together as one unit and must be re- moved from the base unit before being separated from each other.

  • Page 79: Separating The System Board And I/O Board

    Field Service Guidelines 4-11 Figure 4-4 The System Board and I/O Boards Separating the System Board and I/O Board The system board is attached directly to the I/O board. The following procedure should be taken to separate the two boards: Turn off the computer.

  • Page 80: Removing/Replacing The Power Board

    4-12 Field Service Guidelines Figure 4-5 The I/O Board Module Assembly Removing/Replacing the Power Board The procedure for removing the power board is as follows: Turn off the computer. Follow all disassembly procedures mentioned from the start of this section. Remove the two hex spacers from the center of the board and lift the module from the unit.

  • Page 81: Illustrated Parts Breakdown

    4-13 ILLUSTRATED PARTS BREAKDOWN This section contains the illustrated parts breakdown (IPB) and NEC part numbers for the NEC Versa 2500 Series computer. Table 4-1 lists field-replaceable parts and corresponding part numbers. Figure 4-7 shows the field-replaceable parts for the docking station.
  • Page 82 4-14 Field Service Guidelines Table 4-1 NEC Versa 2500 Series Field-Replaceable Parts (cont’d)* Item Description Part Number I/O Cover 24-40794-10 1.4 GB Hard Disk Drive Assembly 25-00371-00 Diskette Drive Assembly 25-00239-00 ROM Door 24-40810-10 Rubber Foot 24-80631-10 Bottom Cover Assembly...

  • Page 83: Nec Versa 2500 Series Illustrated Parts Breakdown

    Field Service Guidelines 4-15 Figure 4-7 NEC Versa 2500 Series Illustrated Parts Breakdown...

  • Page 84: Packaging And Documentation

    Packaging and documentation part numbers are listed in Table 4-2. Table 4-2 Packaging and Documentation Part Numbers Description Model Number NEC Versa 2500 Series User’s Guide 25-10584-00 NEC Versa 2500 Series Service and 819-200191-000 Rev. 00 Reference Manual (this guide)

  • Page 85: Troubleshooting And Repair

    NEC Technologies Technical Support Center (TSC) provides an E-mail service for Internet users besides the support listed in Table 5-1. Technical questions regarding NEC products can be sent over the Internet system to TSC. The Internet address is as follows:...

  • Page 86: Product Information

    Internet or by fax. TSC replies to all questions received by Internet or fax within one business day. PRODUCT INFORMATION NEC FastFacts is an automated electronic information service used to obtain up-to-date product application notes, installation procedures, troubleshooting tips, data sheets, techni- cal information bulletins, price lists, and other information.

  • Page 87: Helpful Starters

    Troubleshooting and Repair For international; enter the international long distance access number, the U.S. telephone number, or the U.S. extension (01-630-775-7999). Listen to the instructions provided by the automated attendant. Press 1 to skip the FastFacts introduction and jump to the automated instructions for ordering a document or catalog.

  • Page 88: Power On Self Test (Post)

    Turn the power off, then back and disable A20 on again. If the problem command. persists contact qualified NEC service personnel. Fixed disk configuration The specified Correct the fixed disk error configuration is not configuration.
  • Page 89 Troubleshooting and Repair Table 5-2 POST Error Messages (cont’d) Message Possible Cause Action No boot device available - Either diskette drive A:, Try rebooting. If problem press to retry boot, the fixed disk, or both the persists, replace the diskette for SETUP utility diskette and fixed disk are or the fixed disk.
  • Page 90 Troubleshooting and Repair Table 5-2 POST Error Messages (cont’d) Message Possible Cause Action Keyboard clock line failure The keyboard, the Make sure the keyboard keyboard cable cable and keyboard are connection, or the connected properly. Check keyboard controller is the keyboard controller and defective.

  • Page 91: Informational Messages

    Troubleshooting and Repair Informational Messages This section lists the messages that provide information to the user but require no action. Table 5-3 BIOS Informational Messages Message Meaning NCH Base Memory The amount of base memory that tested successfully. NCH Extended The amount of extended memory that tested successfully.

  • Page 92: Run-Time Error Messages

    Troubleshooting and Repair Run-time Error Messages The following table lists run-time error messages. Table 5-4 Run-time Error Messages Message Cause Action I/O card parity interrupt at Memory on a peripheral card Check the memory cards address . Type (S)hut off has failed.

  • Page 93: Quick Troubleshooting

    Troubleshooting and Repair QUICK TROUBLESHOOTING This section summarizes problems that may develop during system operation and lists sug- gested corrective actions. Table 5-5 Quick Troubleshooting Problem Corrective Actions No power Check that the AC adapter is plugged into the power connector of the system. Also, that the AC adapter is plugged into a properly grounded AC power outlet.
  • Page 94 5-10 Troubleshooting and Repair Table 5-5 Quick Troubleshooting (cont’d) Problem Corrective Actions System halts during boot sequence Check condition of selected bootload device (diskette or hard disk) for bad boot track or incorrect OS files. Try booting from a new bootable diskette and recopy or repartition hard disk.
  • Page 95 Troubleshooting and Repair 5-11 Table 5-5 Quick Troubleshooting (cont’d) Problem Corrective Actions PCMCIA card does not work Check the PCMCIA driver installation for any IRQ or IO address conflict. Check if the PCMCIA card is inserted properly and all connections are set. Replace the PCMCIA card.

  • Page 96: Appendix A Video Modes

    Appendix A Video Modes The C&T 65548 VGA chipset supports high resolution fixed frequency and variable fre- quency analog monitors in interlaced and non-interlaced modes of operation. Digital moni- tor support is also built-in. The tables in this section list all 65548 CRT monitor video modes.
  • Page 97 Video Modes Table A-2 VGA Standard Modes (Graphics Mode) No. of Text Font Pixel Reso- Horiz. Vert. Mode Colors Display Size lution Clock Freq. Freq. 40 x 25 8 x 8 320 x 200 25.175 31.5 40 x 25 8 x 8 320 x 200 25.175 31.5...

  • Page 98: Vga Extended Modes

    Video Modes VGA EXTENDED MODES The C&T 65548 VGA BIOS supports standard VESA and extended modes, listed in the following table. Table A-5 VGA Extended Modes (Text Mode) No. of Text Font Pixel Dot Clock Horiz. Vert. Mode Colors Display Size Resolution Freq.
  • Page 99 Video Modes Table A-9 VGA Extended Modes (16-Bit Linear Mode) - 1MB Video Memory Only No. of Text Font Pixel Reso- Horiz. Vert. Mode Colors Display Size lution Clock Freq. Freq. 80 x 30 8 x 16 640 x 480 50.350 31.5 Table A-10 VGA Extended Modes (24-Bit Linear Mode)

  • Page 100: Vga High Refresh Modes

    Video Modes VGA HIGH REFRESH MODES The following tables list VGA high refresh modes. Table A-13 VGA High Refresh Modes (Packed Pixel Mode) No. of Text Font Pixel Reso- Horiz. Vert. Mode Colors Display Size lution Clock Freq. Freq. 80 x 30 8 x 16 640 x 480 31.5...

  • Page 101: Battery Replacement

    A CMOS clock battery in your computer maintains system configuration information. In the event that the battery fails to maintain system configuration information, NEC recommends that you re- place the battery. Have an authorized NEC service representative replace the battery.
  • Page 102 Index heat plate, 4-7 I/O board, 4-10 keyboard, 4-7 AC adapter LCD, 4-8 connecting, 1-9 LCD status bar cover, 4-6 AC power adapter, 3-10 LED board, 4-9 AC/DC adapter specifications, 2-16 Power board, 4-12 required tools, 4-3 system board, 4-10 Battery top cover, 4-8 removing, 1-8...
  • Page 103 Setup utility, 1-14 Microprocessor, 3-3 menu, 1-14 Model configurations, 1-1 Shock specifications, 2-22 Specifications system, 2-1 NEC service telephone numbers, 5-1 Status indicators, 2-13 NiMH battery, 1-8 Status panel LEDs, 1-4 Num lock key, 1-5 Subsystems, 3-1 System board specifications, 2-7...
  • Page 104 Index-3 Technical support contacting, 5-1 Transfer board specifications, 2-8 Troubleshooting checklist, 5-3 VersaGlide subsystem, 3-10 VGA extended modes, A-3 VGA high refresh modes, A-5 VGA port, 1-11 VGA standard modes, A-1 VGA VESA driver diskette, 1-11 Vibration specifications, 2-22 Video controller, 3-7 features, 3-7 Video modes, A-1 Y-adapter, 1-10...

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