NEC VERSA MEDIADOCK - SERVICE User manual

First Printing — March 1995
Copyright 1995 Copyright 1995
NEC Technologies, Inc. NEC Corporation
1414 Massachusetts Avenue 7-1 Shiba 5-Chome, Minato-Ku
Boxborough, MA 01719 Tokyo 108-01, Japan
All Rights Reserved All Rights Reserved
PROPRIETARY NOTICE AND LIABILITY DISCLAIMER
The information disclosed in this document, including all designs and related materials, is
the valuable property of NEC Corporation (NEC) and/or its licensors. NEC and/or its licen-
sors, as appropriate, reserve all patent, copyright and other proprietary rights to this docu-
ment, including all design, manufacturing, reproduction, use, and sales rights thereto, except
to the extent said rights are expressly granted to others.
The NEC 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 NEC.
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 NEC is prohibited.
FastFacts, and NEC SVGA, are U.S. trademarks of NEC Technologies, Inc.
All other product, brand, or trade names used in this publication are the trademarks or registered
trademarks of their respective trademark owners.

ix
Preface
This service and reference manual contains the technical information necessary to set up,
maintain, troubleshoot, and repair the NEC Versa™ Series MediaDock audio system. It
also provides hardware and interface information for users who need an overview of the
system design. The manual is written for NEC-trained customer engineers, system analysts,
service center personnel, and dealers.
The manual is organized as follows:
Section 1  Technical Information, provides an overview of the hardware and interface
components. System specifications are listed including MediaDock dimensions, environ-
ment, safety compliance, and power consumption.
Section 2  Setup and Operation,takes the user from unpacking to setup and operation.
The section includes a description of operating controls, setting parameters and accessing
the NEC bulletin board system (BBS).
Section 3  Options, provides the user with installation procedures for MediaDock op-
tions.
Section 4  Troubleshooting and Repair, includes maintenance, troubleshooting, disas-
sembly and reassembly, and illustrated parts breakdown information. NEC service and spare
parts ordering information is also provided. Included is a list of NEC service and informa-
tion telephone numbers that provide access to the NEC Bulletin Board System (BBS),
FASTFACTS, and Technical Information Bulletins.
Appendix A Software Setup for Customized Disks,provides information for using the
MediaDock in conjunction with a hard disk other than the one that shipped with the Versa
system.
Appendix B System Files, contains CONFIG.SYS and AUTOEXEC.BAT sample files.
The examples reflect the contents of the files after the MediaDock setup utility is run.
An Index is included for convenience.

xi
Abbreviations
Aampere
AC alternating current
AT advanced technology
(IBM PC)
ACU automatic configuration utility
Amp amplifier
BBS Bulletin Board System
BCD binary-coded decimal
BCU BIOS Customized Utility
BIOS basic input/output system
bit binary digit
bpi bits per inch
bps bits per second
BUU BIOS Upgrade Utility
Ccentigrade
Cache high-speed buffer storage
CAM constantly addressable memory
CAS column address strobe
CD-ROM compact disk-ROM
CGA Color Graphics Adapter
CGB Color Graphics Board
CH channel
clk clock
cm centimeter
CMOS complementary metal oxide
semiconductor
COM communication
CONT contrast
CPU central processing unit
CRT cathode-ray tube
DAC digital-to-analog converter
DACK DMA acknowledge
DC direct current
DIP dual in-line package
DLAB Divisor Latch Address bit
DMA direct memory access
DMAC DMA controller
DOS disk operating system
DRAM dynamic RAM
D/S docking station
EPROM erasable and programmable
ROM
FFahrenheit
FAX facsimile transmission
FCC Federal Communications
Commission
FG frame ground
FM frequency modulation
Fn Function
FRU field-replaceable unit
GB gigabyte
GND ground
HDD hard diskdrive
HEX hexadecimal
HGA Hercules Graphics Adapter
Hz hertz
IC integrated circuit
ID identification
IDE intelligent device electronics
IDTR interrupt descriptor table
register
IMR Interrupt Mask register
in. inch
INTA interrupt acknowledge
IPB illustrated parts breakdown
IRR Interrupt Request register
ISA Industry Standard Architecture
ISR In Service register
I/O input/output
ips inches per second
IRQ interrupt request
ISA industry standard architecture

xii Abbreviations
Kkilo (1024)
kkilo (1000)
KB kilobyte
kg kilogram
kHz kilohertz
kV kilovolt
lb pound
LED light-emitting diode
Mmega
mA milliamps
max maximum
MB megabyte
MFM modified frequency modulation
Mhz megahertz
Mic microphone
MIDI musical instrument digital
interface
mm millimeter
ms millisecond
NASC National Authorized Service
Center
NC not connected
NDP numeric data processor
NMI Non-maskable Interrupt
ns nanosecond
NSRC National Service Response
Center
PAL programmable array logic
PC personal computer
PCB printed circuit board
PFP plastic flat package
PIO parallel input/output
pixel picture element
p-p peak-to-peak
PPI programmable peripheral
interface
PQFP plastic quad flat package
PROM programmable ROM
QFP quad flat pack
RAM random-access memory
RAMDAC RAM digital-to-analog
RAS row address strobe
RGB red green blue
Rread
RTC real-time clock
R/W read/write
Sslave
SIMM single inline memory module
SOF silver package
SOP silver package
SW switch
TAC Technical Assistance Center
TSC Technical Support Center
TTL transistor/transistor logic
tpi tracks per inch
UART universal asynchronous
receiver/transmitter
Vvolt
Vdc volts, direct current
VESA video electronics standards
association
VFO variable frequency oscillator
VGA Video Graphics Array
Wwatt
Wwrite
µfmicrofarad
µPD microprocessor
µsmicrosecond
Ωohm

iii
Contents
Preface........................................................................................................................ ix
Abbreviations .............................................................................................................. xi
Section 1 Technical Information
Hardware Overview.....................................................................................................1-2
Chassis .................................................................................................................1-2
Sound Board ........................................................................................................1-4
Power Amplifier Board.........................................................................................1-6
Speakers...............................................................................................................1-6
CD-ROM Reader..................................................................................................1-7
Cables...................................................................................................................1-7
MediaDock Chipset.....................................................................................................1-7
Digital Interface...........................................................................................................1-8
Analog Interface..........................................................................................................1-9
I/O Address Map.........................................................................................................1-9
Interrupt Level Assignments........................................................................................1-10
Specifications ..............................................................................................................1-12
Section 2 Setup and Operation
Unpacking the System .................................................................................................2-1
Environment.........................................................................................................2-1
Hardware Setup...........................................................................................................2-1
Connecting the Versa............................................................................................2-2
Powering On..................................................................................................2-5
Disconnecting the Versa .......................................................................................2-6
Powering Off.................................................................................................2-6
Software Setup............................................................................................................2-9
Running the ACU.................................................................................................2-10
Running the ACU for the Versa M.................................................................2-10
Running the ACU for the Versa V .................................................................2-11
Running the ACU for the UltraLite Versa, Versa E, and Versa P ...................2-12
Creating a Start-Up Diskette.................................................................................2-13
Running the MediaDock Setup Utility...................................................................2-14

iv Contents
Software Use........................................................................................................2-15
Choosing a Configuration ..............................................................................2-16
Using the Audio Switcher Utility....................................................................2-16
Using DOS-Based Programs.................................................................................2-19
Changing the Volume ....................................................................................2-19
Changing IRQ and DMA Settings..................................................................2-20
MediaDock Controls ...................................................................................................2-21
MediaDock Connectors........................................................................................2-22
Versa Battery Charging ...............................................................................................2-23
CD-ROM USE............................................................................................................2-23
CD Loading..........................................................................................................2-25
Audio CDs ...........................................................................................................2-26
Adding the CD Audio Option ........................................................................2-26
Playing Audio CDs ........................................................................................2-27
CD Care........................................................................................................2-27
Emergency Eject............................................................................................2-28
Section 3 Options
Headphones or External Speakers.........................................................................3-1
Connecting Headphones ................................................................................3-2
Connecting External Speakers........................................................................3-2
External Microphone............................................................................................3-2
Section 4 Troubleshooting and Repair
Service ........................................................................................................................4-1
Technical Support.................................................................................................4-2
Product Information .............................................................................................4-2
Ordering Information from FastFacts....................................................................4-3
Maintenance................................................................................................................4-4
Cleaning the System's Exterior..............................................................................4-4
Cleaning the System's Interior...............................................................................4-4
Precautions....................................................................................................4-4
Troubleshooting ..........................................................................................................4-6
Diagnosing and Solving Problems.........................................................................4-6
Remote Technical Support....................................................................................4-7
NEC Communications Assistant ...........................................................................4-7

Contents v
Disassembly and Reassembly .......................................................................................4-8
Top Cover Assembly ............................................................................................4-9
Sound Board ........................................................................................................4-12
Power Amplifier Board.........................................................................................4-14
Assembly Handle, Right Latch, Left Latch............................................................4-16
CD ROM Reader..................................................................................................4-18
High-Range Speakers ...........................................................................................4-20
Mid-Range Speakers.............................................................................................4-23
Illustrated Parts Breakdown.........................................................................................4-24
Appendix A Software Setup for Customized Disks
System File Modification .............................................................................................A-1
Modifying the CONFIG.SYS File.........................................................................A-1
Modifying the AUTOEXEC.BAT File..................................................................A-3
Appendix B System Files
CONFIG.SYS .............................................................................................................B-1
AUTOEXEC.BAT ......................................................................................................B-2
List of Figures
1-1 MediaDock (Shown Connected to Versa P)...................................................1-1
1-2 MediaDock Front and Side View...................................................................1-2
1-3 MediaDock Rear and Side View....................................................................1-3
1-4 Locating Sound Board Connectors ................................................................1-4
1-5 Audio Subsystem...........................................................................................1-5
1-6 Locating Power Amplifier Board Connectors.................................................1-6
2-1 Connecting the AC Adapter...........................................................................2-2
2-2 Opening the Versa Expansion Port Cover ......................................................2-3
2-3 Stowing the Expansion Port Cover ................................................................2-3
2-4 Aligning the Versa and the MediaDock..........................................................2-4
2-5 Securing the Docking Lever...........................................................................2-4
2-6 Turning Power On.........................................................................................2-6
2-7 Turning Power Off.........................................................................................2-7
2-8 Releasing the Docking Lever .........................................................................2-8
2-9 Pressing the Release Buttons..........................................................................2-8

vi Contents
2-10 Locking Latch During Release.......................................................................2-9
2-11 Versa M Audio Switcher Welcome Screen.....................................................2-17
2-12 Audio Switcher Dialog Box...........................................................................2-18
2-13 MediaDock Controls......................................................................................2-21
2-14 MediaDock I/O Connectors...........................................................................2-22
2-15 CD-ROM Reader Controls and Indicators......................................................2-24
2-16 Pressing the Stop/Eject Button.......................................................................2-25
2-17 Loading a CD into the Reader........................................................................2-25
2-18 Wipe a Disc from the Center and Toward the Edge........................................2-17
2-19 Opening the Dust Door..................................................................................2-28
2-20 Emergency Eject Hole Behind the Dust Door.................................................2-18
3-1 Headphone Port on the MediaDock Base.......................................................3-2
3-2 Microphone Port............................................................................................3-3
4-1 Removing the Top Cover Screws...................................................................4-9
4-2 Removing Bottom Screws .............................................................................4-10
4-3 Removing Docking Cable Screw....................................................................4-11
4-4 Locating Sound Board Connectors ................................................................4-12
4-5 Removing the Sound Board Screws...............................................................4-13
4-6 Unplugging the Red/Black Speaker Cable......................................................4-14
4-7 Removing the Power Amplifier Board Screws................................................4-15
4-8 Removing Assembly Handle Screws...............................................................4-16
4-9 Locating the Left Latch and Torsion Spring...................................................4-17
4-10 Removing CD ROM Cables...........................................................................4-18
4-11 Removing the CD ROM Screws ....................................................................4-19
4-12 Disconnecting the Speaker Cable...................................................................4-20
4-13 Removing the Yellow Clasp Connectors ........................................................4-21
4-14 Removing the MediaDock Handle..................................................................4-21
4-15 Removing Mid-Range Speaker Screws ..........................................................4-22
4-16 Removing Speaker Cables from Mid-Range Speakers....................................4-23
4-17 Removing the Mid-Range Speaker Screws.....................................................4-23
4-18 Versa Series MediaDock Parts Breakdown....................................................4-26

Contents vii
List of Tables
1-1 MediaDock Chip Types and Technologies .....................................................1-7
1-2 Digital I/F Specifications................................................................................1-8
1-3 Analog I/F Specifications...............................................................................1-9
1-4 I/O Address Map...........................................................................................1-9
1-5 Interrupt Level Assignments ..........................................................................1-10
1-6 MediaDock Specifications..............................................................................1-12
2-1 I/O Connector Descriptions ...........................................................................2-22
4-1 NEC Service and Information Telephone Numbers ........................................4-1
4-2 Problems and Solutions..................................................................................4-6
4-3 MediaDock Disassembly Sequence ................................................................4-8
4-4 Versa Series MediaDock Field-Replaceable Parts*.........................................4-24

Section 1
Technical Information
The NEC Versa™ MediaDock™ offers the user the finest quality sound system available
for laptop multimedia presentations. The MediaDock works with the following NEC Versa
laptop models, providing an excellent way to integrate sound with video:
nNEC UltraLite Versa Series computer
nNEC Versa E Series computer
nNEC Versa V Series computer
nNEC Versa M Series computer
nNEC Versa P Series computer.
NOTE: If a model that does not appear on the
above list is connected to the MediaDock, the
laptop displays a configuration error.
Figure Section 1-1MediaDock (Shown Connected to Versa P)