Mitsubishi Electric DR854 User manual

42" LCD Display Monitor
USER’S MANUAL
BEDIENERHANDBUCH
MANUAL DEL USUARIO
MANUEL UTILISATEUR
MANUALE UTENTE
GEBRUIKERSHANDLEIDING

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English
Deutsch
Español
Français
Italiano
Nederlands

English
English-1
Important Information................................................................................................................................... English-2
Safety Precautions, Maintenance & Recommended Use ........................................................................... English-4
Contents....................................................................................................................................................... English-5
Parts Name and Functions .......................................................................................................................... English-6
Buttons, Switch, and Indicator ....................................................................................................... English-6
Connectors and Terminals .............................................................................................................. English-7
Wireless Remote Control ............................................................................................................... English-8
< Operating Range for the Remote Control >........................................................................... English-9
< Handling the remote control > ............................................................................................... English-9
Setup Procedure .......................................................................................................................................... English-10
CAT5 video connection................................................................................................................... English-12
How to Mount and Attach Options to the LCD Monitor............................................................................... English-14
Connections ................................................................................................................................................. English-15
Wiring Diagram ............................................................................................................................... English-15
Connecting a Personal Computer .................................................................................................. English-16
Connecting with Digital Interface Equipment ................................................................................ English-17
Connecting a DVD Player with component output / HDMI output / DVI output............................. English-18
Connecting to a VCR / Stereo Amplifier ......................................................................................... English-19
Basic Operation............................................................................................................................................ English-20
Power ON and OFF Modes ............................................................................................................ English-20
Power Indicator............................................................................................................................... English-21
Using Power Management ............................................................................................................ English-21
Selecting a video source ................................................................................................................ English-21
Picture Size .................................................................................................................................... English-21
Picture Mode .................................................................................................................................. English-21
Audio Source Switching ................................................................................................................. English-21
Control Lock Mode......................................................................................................................... English-21
Information OSD ............................................................................................................................. English-22
OSD (On-Screen-Display) Controls.............................................................................................................. English-23
PICTURE......................................................................................................................................... English-24
SCREEN.......................................................................................................................................... English-26
AUDIO............................................................................................................................................. English-27
PIP (PICTURE IN PICTURE)............................................................................................................ English-27
CONFIGURATION 1........................................................................................................................ English-28
CONFIGURATION 2........................................................................................................................ English-29
ADVANCED OPTION ...................................................................................................................... English-30
NOTE .............................................................................................................................................. English-32
< IMAGE PERSISTENCE > ....................................................................................................... English-32
< For long life use of Public Display > ...................................................................................... English-32
< HOW TO SETUP SCHEDULE >............................................................................................. English-32
< PIP, POP and SIDE BY SIDE >............................................................................................... English-33
< Supplemental information of the auto brightness function > ................................................ English-33
< Remote control numbering function >................................................................................... English-34
Controlling the LCD monitor via RS-232C/RS-485 Remote Control .......................................................... English-35
Features........................................................................................................................................................ English-37
Troubleshooting............................................................................................................................................ English-38
Specifications .............................................................................................................................................. English-40
Pin Assignment ............................................................................................................................................ English-41
Index

English-2
Important Information
DECLARATION OF CONFORMITY
This device complies with Part 15 of FCC Rules. Operation is subject to the following two conditions. (1) This device may
not cause harmful interference, and (2) this device must accept any interference received, including interference that may
cause undesired operation.
U.S. Responsible Party: Mitsubishi Digital Electronics America, Inc.
Address: 9351 Jeronimo Road,
Irvine, California 92618 U.S.A.
Tel. No.: +1 - [phone]
Type of Product: Computer Monitor
Equipment Classification: Class B Peripheral
Model: MDT421S (DR854)
We hereby declare that the equipment specified above
conforms to the technical standards as specified in the FCC Rules.
Windows is a registered trademark of Microsoft Corporation. All other brands and product names are trademarks or
registered trademarks of their respective owners.
HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI
Licensing LLC.
The DisplayPort Icon is a trademark of the Video Electronics Standards Association, registered in the U.S. and other
countries.
Canadian Department of Communications Compliance Statement
DOC: This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
C-UL: Bears the C-UL Mark and is in compliance with Canadian Safety Regulations according to CAN/CSA C22.2
No. 60950-1.
FCC Information
1. Use the attached specified cables with the MDT421S (DR854) color monitor so as not to interfere with radio and television
reception.
(1) Please use the supplied power cord or equivalent to ensure FCC compliance.
(2) Please use the supplied shielded video signal cable, 15-pin mini D-SUB to 15-pin mini D-SUB.
2. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the
FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult your dealer or an experienced radio/TV technician for help.
If necessary, the user should contact the dealer or an experienced radio/television technician for additional suggestions.
The user may find the following booklet, prepared by the Federal Communications Commission, helpful: “How to Identify
and Resolve Radio-TV Interference Problems.” This booklet is available from the U.S. Government Printing Office,
Washington, D.C., 20402, Stock No. 004-000-00345-4.

English
English-3
Important Information
TO REDUCE THE RISK OF ELECTRIC SHOCK, MAKE SURE POWER CORD IS UNPLUGGED FROM
WALL SOCKET. TO FULLY DISENGAGE THE POWER TO THE UNIT, PLEASE DISCONNECT THE
POWER CORD FROM THE AC OUTLET. DO NOT REMOVE COVER (OR BACK). NO USER
SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
This symbol warns user that uninsulated voltage within the unit may have sufficient magnitude to cause
electric shock. Therefore, it is dangerous to make any kind of contact with any part inside this unit.
This symbol alerts the user that important literature concerning the operation and maintenance of this unit
has been included. Therefore, it should be read carefully in order to avoid any problems.
CAUTION
TO PREVENT FIRE OR SHOCK HAZARDS, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. ALSO, DO NOT USE THIS
UNIT’S POLARIZED PLUG WITH AN EXTENSION CORD RECEPTACLE OR OTHER OUTLETS UNLESS THE PRONGS CAN BE
FULLY INSERTED.
REFRAIN FROM OPENING THE CABINET AS THERE ARE HIGH VOLTAGE COMPONENTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
This LCD Monitor uses a lamp that contains mercury. Disposal of the lamp or the LCD Monitor with the lamp
may be regulated due to environmental considerations. For disposal or recycling information, please contact
your local authorities or the Electronic Industries Alliance: www.eiae.org. (For US only).
CAUTION
Declaration
Declaration of the Manufacturer
We hereby certify that the color monitor MDT421S (DR854)
is in compliance with
Council Directive 2006/95/EC:
– EN 60950-1
Council Directive 2004/108/EC:
– EN 55022
– EN 61000-3-2
– EN 61000-3-3
– EN 55024
Declaration of the Manufacturer
Note: This symbol mark is for EU countries only.
This symbol mark is according to the directive 2002/96/EC Article 10 Information for users and
Annex IV, and/or to the directive 2006/66/EC Article 20 Information for end-users and Annex II.
Your MITSUBISHI ELECTRIC product is designed and manufactured with high quality
materials and components which can be recycled and/or reused.
This symbol means that electrical and electronic equipment, batteries and accumulators,
at their end-of-life, should be disposed of separately from your household waste.
If a chemical symbol is printed beneath the symbol shown above, this chemical symbol means that the
battery or accumulator contains a heavy metal at a certain concentration. This will be indicated as follows:
Hg: mercury (0,0005%), Cd: cadmium (0,002%), Pb: lead (0,004%)
In the European Union there are separate collection systems for used electrical and electronic products,
batteries and accumulators.
Please, dispose of this equipment, batteries and accumulators correctly at your local community waste
collection/recycling centre.
Please, help us to conserve the environment we live in!
and marked with
Mitsubishi Electric Corporation
2-7-3, Marunouchi,
Chiyoda-Ku
Tokyo 100-8310, Japan
CAUTION
WARNING

English-4
• The power cable connector is the primary means of
detaching the system from the power supply. The monitor
should be installed close to a power outlet, which is easily
accessible.
• Handle with care when transporting. Save packaging for
transporting.
• Please clean the holes of back cabinet to reject dirt and
dust at least once a year because of set reliability.
• If using the cooling fan continuously, it’s recommended to
wipe holes a minimum of once a month.
• When installing the remote control batteries;
- Align the batteries according to the (+) and (-)
indications inside the case.
- Align the (-) indication of the battery first inside the
case.
CAUTION:
Immediately unplug your monitor from the wall outlet and re-
fer servicing to qualified service personnel under the following
conditions:
• When the power supply cord or plug is damaged.
• If liquid has been spilled, or objects have fallen into the
monitor.
• If the monitor has been exposed to rain or water.
• If the monitor has been dropped or the cabinet damaged.
• If the monitor does not operate normally by following
operating instructions.
Recommended Use
CAUTION:
• For optimum performance, allow 20 minutes for warm-up.
• Rest your eyes periodically by focusing on an object at
least 5 feet away. Blink often.
• Position the monitor at a 90° angle to windows and other
light sources to minimize glare and reflections.
• Clean the LCD monitor surface with a lint-free, non-
abrasive cloth. Avoid using any cleaning solution or glass
cleaner!
• Adjust the monitor’s brightness, contrast and sharpness
controls to enhance readability.
• Avoid displaying fixed patterns on the monitor for long
periods of time to avoid image persistence (after image
effects).
• Get regular eye checkups.
Ergonomics
To realize the maximum ergonomic benefits, we recommend
the following:
• Use the preset Size and Position controls with standard
signals.
• Use the preset Color Setting.
• Use non-interlaced signals.
• Do not use primary color blue on a dark background, as
it is difficult to see and may produce eye fatigue due to
insufficient contrast.
FOR OPTIMUM PERFORMANCE, PLEASE NOTE
THE FOLLOWING WHEN SETTING UP AND USING
THE LCD COLOR MONITOR:
• DO NOT REMOVE MONITOR BACK COVER. There are
no user serviceable parts inside and opening or removing
covers may expose you to dangerous shock hazards or
other risks.
Refer all servicing to qualified service personnel.
• Do not spill any liquids into the cabinet or use your
monitor near water.
• Do not insert objects of any kind into the cabinet slots, as
they may touch dangerous voltage points, which can be
harmful or fatal or may cause electric shock, fire or
equipment failure.
• Do not place any heavy objects on the power cord.
Damage to the cord may cause shock or fire.
• Do not place this product on a sloping or unstable cart,
stand or table, as the monitor may fall, causing serious
damage to the monitor.
• When operating the LCD monitor with an AC 100-120V
power supply in North America, use a power supply cord
provided with this monitor.
• When operating the LCD monitor with an AC 220-240V
power supply in Europe, use a power supply cord
provided with this monitor.
• In UK, use a BS-approved power cord with molded plug
having a black (10A) fuse installed for use with this
monitor.
If a power cord is not supplied with this monitor, please
contact your supplier.
• When operating the LCD monitor with a 220-240V AC
power supply in Australia, use the power cord provided
with this monitor.
If a power cord is not supplied with this monitor, please
contact your supplier.
• For all other cases, use a power cord that matches the
AC voltage of the power outlet and has been approved by
and complies with the safety standard of your particular
country.
• Do not place any objects onto the monitor and do not use
the monitor outdoors.
• The inside of the fluorescent tube located within the LCD
monitor contains mercury. Please follow the laws or rules
of your municipality to dispose of the tube properly.
• Do not bend power cord.
• Do not use monitor in high temperature, humid, dusty, or
oily areas.
• If monitor or glass is broken, do not come in contact with
the liquid crystal and handle with care.
• If the LCD monitor is damaged and the liquid crystal leaks
out, do not inhale or swallow it.
• Allow adequate ventilation around the monitor, so that
heat can properly dissipate. Do not block ventilated
openings or place the monitor near a radiator or other
heat sources.
Do not put anything on top of the monitor.
Safety Precautions, Maintenance & Recommended Use

English
English-5
Contents
* Remember to save your original box and packing material to transport or ship the monitor.
Your new MDT421S monitor box* should contain the following:
• LCD monitor
• Power Cord (3 m)
• Video Signal Cable (4 m)
• User’s Manual
• Wireless Remote Control and AAA Batteries
• Clamper x 2 (To prevent from falling)
• Clamper x 3 (For securing cables)
• Clamper x 2 (For securing the power cord, HDMI cable, and
Display Port cable)
• Screw for Clamper (To prevent from falling) x 2
The following components are prepared as option.
• External Speakers
• Stands
• Bezel
• CAT5 Kit
Screw for Clamper
(M4) x 2
Video Signal Cable
(D-SUB to D-SUB Cable)
User’s Manual
Clamper x 3
(For securing cables)
Clamper x 2
(To prevent from falling)
Clamper x 2
(For securing the power cord,
HDMI cable, and Display Port cable)
* The supplied power cord varies depending on destination.
For EU For North
America
Power cord
* For all other case, use a power cord that matches the AC voltage
of the power outlet and has been approved by and complies with
the safety standard of your particular country.
Wireless Remote Control
and AAA Batteries
42" LCD Display Monitor
USER’S MANUAL
BEDIENERHANDBUCH
MANUAL DEL USUARIO
MANUEL UTILISATEUR
MANUALE UTENTE
GEBRUIKERSHANDLEIDING

English-6
ON
OFF
UP ( ) button
Activates the OSD menu when the OSD menu is turned-off.
Acts as button to move the highlighted area up to select
the adjustment with OSD menu.
DOWN ( ) button
Activates the OSD menu when the OSD menu is turned-off.
Acts as button to move the highlighted area down to select
the adjustment with OSD menu.
EXIT button
Press the EXIT button to display the OSD menu while it isn’t
being displayed.
By pressing this button while the OSD menu is being
displayed, you can move backward through the menu items.
(You can move forward through the menu items using the
INPUT button.) When you press this button at the Main Menu,
the OSD menu disappears. (See page 23.)
Brightness sensor (front, rear)
Sensor for the auto brightness function. ( See page 25, 33.)
Main Power Switch
On/Off Switch to turn main power on/off.
NOTE: Control Key Lock Mode
This control completely locks out access to all Control Key
functions. To activate the control key lock function, press
both of “ ” and “ ” and hold down simultaneously for
more than 3 seconds. To resume back to user mode, press
both of “ ” and “ ” and hold simultaneously for three (3)
seconds.
Remote control sensor and Power indicator
Receives the signal from the remote control (when using the
wireless remote control). See also page 9.
Glows green when the LCD monitor is in active and glows
red when the LCD is in POWER OFF mode. When the LCD is
in power save mode, it will glow both green and red. When
SCHEDULE is enabled, it will blink green and glow red. See
page 21. In the case of where a failure is detected, it will blink
red.
POWER button ( )
Switches the power on/off. See also page 20.
MUTE button
Switches the audio mute ON/OFF.
INPUT button
Displays the OSD menu for switching the video input.
(Select [RGB1], [RGB2], [RGB3], [RGB4], [RGB5]*, [RGB6],
[DVD/HD], [VIDEO<S>] and [VIDEO] using the UP ( ) and
DOWN ( ) buttons.)
* : [RGB 5] becomes usable when the optional CAT5 Rx BOX
is mounted.
By pressing this button while the OSD menu is being
displayed, you can move forward through the menu items.
(See page 23.)
PLUS (+) button
Acts as (+) button to increase the adjustment with OSD menu.
Increase the audio output level when the OSD menu is turned
off.
MINUS (-) button
Acts as (-) button to decrease the adjustment with OSD menu.
Decreases the audio output level when the OSD menu is
turned off.
Buttons, Switch, and Indicator
Parts Name and Functions

English
English-7
EXTERNAL SPEAKER TERMINAL
To output the audio signal for external speakers from AUDIO 1,
2, 3 jack or HDMI.
AUDIO OUT
To output the audio signal from the AUDIO IN 1, 2, 3 jack or
HDMI.
AUDIO IN 1, 2, 3
To input the audio signal from external equipment such as a
computer, VCR or DVD player.
RGB 1 IN (HDMI)
To input the digital RGB signals from a computer, DVD player,
etc.
* This connector does not support analog input.
AUDIO is supported via HDMI.
RGB 2 IN (DVI-D)
To input the digital RGB signals from a computer.
* This connector does not support analog input.
AUDIO is supported via DVI-D.
RGB 3 IN (mini D-Sub 15 pin)
To input the analog RGB signals from a computer or other
RGB equipment.
RGB OUT (mini D-Sub 15 pin)
To output the signal from RGB 3, 4 or 5 IN.
RGB 6 IN (DISPLAY PORT)
To input the digital RGB signals from a computer.
CAT5 Rx BOX slot
The CAT5 Rx BOX (option) is inserted in this slot. (See page
12.)
NOTE:
Never connect network devices to the CAT5 IN and OUT
connectors. If you do so, they may adversely affect with each
other, causing breakdown.
EXTERNAL CONTROL (mini D-Sub 9 pin)
Connect the IN connector with the RS-232C OUT connector
of the computer or a multi-connected MDT421S monitor.
Connect the OUT connector with the RS-232C IN connector
of a multi-connected MDT421S or MDT521S monitor.
VIDEO IN/OUT
VIDEO IN connector (BNC and RCA): To input a composite
video signal. BNC and RCA are not available at the same
time. (Use only one input).
VIDEO OUT connector (BNC): To output the composite
video signal from VIDEO IN connector.
S-VIDEO IN connector (MINI DIN 4 pin): To input the
S-video (Y/C separate signal).
RGB 4 IN / DVD/HD IN (BNC)
To input the analog RGB signals from a computer or other
RGB equipment.
Connecting equipment such as a DVD player, HDTV device,
or Laser disc player. See page 16, 18.
AC IN connector
Connects with the supplied power cord.
Connectors and Terminals
(OUT)
(IN)
(OUT)
(IN)
(IN)
(IN)

English-8
Wireless Remote Control
POWER button
Switches the power on/off.
* If LED Power Indicator on the monitor is not glowing, then
no controls will work.
INPUT button
Selects from input signal, [RGB1] (HDMI), [RGB2] (DVI-D),
[RGB3] (D-SUB), [RGB4] (BNC), [RGB5]* (CAT5), [RGB6] (DIS-
PLAY PORT), [DVD/HD] (YPbPr), [VIDEO<S>] and [VIDEO].
* : [RGB 5] becomes usable when the optional CAT5 Rx BOX
is mounted.
PICTURE MODE button
Selects from picture mode, [HIGHBRIGHT], [STANDARD],
[sRGB], [CINEMA]. See page 21.
HIGHBRIGHT: for moving image such as Video
STANDARD: for images (Factory setting)
sRGB: for text based images
CINEMA: for movies
DISPLAY button
To switch the information OSD on/off. See page 22.
SET button
Acts as SET button with OSD menu.
MINUS button decrease
Acts as (-) button to decrease the adjustment with OSD menu.
Small screen which adjusted “PIP” mode moves left.
AUTO SETUP button
To enter the auto setup menu. See page 28.
AUDIO INPUT button
Press to change the audio source for each video source. The
audio source is changed from [AUDIO1] to [AUDIO2], [AUDIO3]
and [HDMI] in order. Note that you cannot select the audio
source for [VIDEO<S>] or [VIDEO]. [HDMI] is selectable only
when the video source is [RGB 1].
PIP (Picture In Picture) button
ON/OFF button: PIP-ON/OFF. See page 27, 33.
INPUT button: Select the “picture in picture” input signal.
CHANGE button: Replaces to the main picture and sub pic-
ture.
Note:
The “PIP” and “POP” modes do not function when the screen
size is “CUSTOM” or “REAL”.
STILL button
ON/OFF button: To switch the still picture mode on/off.
CAPTURE button: Updates the still picture.
SIZE button
Selects picture size, [FULL], [NORMAL], [CUSTOM] , [DY-
NAMIC] and [REAL]. See page 21.
MENU button
To switch the menu mode on/off.
UP button
Acts as button to move the highlighted area up to select
the adjustment with OSD menu.
Small screen which adjusted “PIP” mode moves up.
PLUS button increase
Acts as (+) button to increase the adjustment with OSD menu.
Small screen which adjusted “PIP” mode moves right.
EXIT button
Turn to previous menu with OSD menu.
DOWN button
Acts as button to move the highlighted area down to select
the adjustment with OSD menu.
Small screen which adjusted “PIP” mode moves down.
MUTE button
To switch the mute function on/off.
VOLUME button
Increases or decreases the audio output level.

English
English-9
< Operating Range for the Remote
Control >
Point the top of the remote control toward the LCD monitor's
remote sensor during button operation.
Use the remote control within a distance of about 7 m/23 ft.
from the front of the LCD monitor's remote control sensor
and at a horizontal and vertical angle of within 30° within a
distance of about 3 m/10 ft.
CAUTION:
Important, the remote control system may not function when
direct sunlight or strong illumination strikes the remote control
sensor of the LCD monitor, or when there is an object in the
path.
< Handling the remote control >
* Do not subject to strong shock.
* Do not allow water or other liquid to splash the remote
control. If the remote control gets wet, wipe it dry immedi-
ately.
* Avoid exposure to heat and steam.
* Other than to install the batteries, do not open the remote.
30° 30°

English-10
1. Determine the installation location
CAUTION:
DO NOT ATTEMPT TO INSTALL THE LCD MONITOR BY
YOURSELF.
Installing your LCD display must be done by a qualified tech-
nician. Contact your dealer for more information.
CAUTION:
MOVING OR INSTALLING THE LCD MONITOR MUST BE
DONE BY TWO OR MORE PEOPLE.
Failure to follow this caution may result in injury if the LCD
monitor falls.
CAUTION:
Do not mount or operate the display upside down or face
down.
CAUTION:
Do not install the LCD monitor where it will be exposed to
direct sunlight, as this will result in display defects.
CAUTION:
This LCD has a temperature sensor and cooling fan. If the
LCD becomes too hot, the cooling fan will turn on automati-
cally. If the LCD becomes overheated and the cooling fan
is running, the “Caution” menu will appear. If the “Caution”
menu appears, discontinue use and allow the unit to cool.
When the LCD monitor is used in an enclosure or with protec-
tion on LCD surface, please check the inside temperature of
monitor by “HEAT STATUS” (See page 31). The temperature is
too hot than normal condition, please set “cooling fan” to ON
on SCREEN SAVER function (See page 28).
IMPORTANT:
Lay the protective sheet, which was wrapped around the LCD
monitor when it was packaged, beneath the LCD monitor so
as not to scratch the panel.
2. Installing and removing the remote
control batteries
The remote control is powered by 1.5V AAA batteries.
To install or replace batteries:
How to install the batteries
1. Unlock and pull up the cover in the arrow’s direction.
2. Align the batteries according to the (+) and (–) indications
inside the case.
3. Replace the cover.
How to remove the batteries
1. Unlock and pull up the cover in the arrow’s direction.
2. Remove the batteries.
CAUTION:
Incorrect use of batteries can result in leaks or bursting.
Be careful especially about the following points.
• Place “AAA” batteries matching the + and - signs on each
battery to the + and - signs of the battery compartment.
• Do not mix battery types.
• Do not combine new batteries with used ones. It causes
shorter battery life or leakage of batteries.
• Remove dead batteries immediately to prevent battery
liquid from leaking into the battery compartment. Don't
touch exposed battery acid, it cause damage to your skin.
NOTE:
If you do not intend to use the Remote Control for a long
period, remove the batteries.
3. Connect external equipment
(See pages 15-19)
• To protect the connected equipment, turn off the main
power before making connections.
• Refer to your equipment user manual.
4. Connect the supplied power cord
• The power outlet socket should be installed as near to the
equipment as possible, and should be easily
accessible.
• Fully insert the prongs into the power outlet socket.
Loose connection may cause noise.
NOTE:
Please refer to “Safety Precautions, Maintenance &
Recommended Use” section of this manual for proper
selection of AC power cord.
5. Switch on the power of all the
attached external equipment
When connected with a computer, switch on the power of the
computer first.
Setup Procedure
Clamper
Use the clamper
to secure the
cable firmly.

English
English-11
6. Operate the attached external equipment
Display the signal on the external equipment you wish.
7. Adjust the sound
Make adjustments lowering or rising the volume as required.
8. Adjust the screen (See pages 24-34)
Make adjustments to the display position or settings if re-
quired.
9. Adjust the image (See pages 24-34)
Make adjustments to brightness or contrast if required.
10. Recommended Adjustment
To reduce the risk of “image persistence”, please adjust
the following items based on the application being used.
“POWER SAVE” (See page 28), “SCREEN SAVER” (See
page 28), “SIDE BORDER COLOR”(See page 28), “DATE
AND TIME” (See page 31), “SCHEDULE”(See page 31).
11. Installing and removing the stands
The stands are prepared as option.
Refer to the user’s manual of the stand for more information.
How to install the stands
1. Please turn monitor off.
2. Fasten screws on both sides of the monitor.
NOTE:
Install the stands so that their longer portions come to the
front.
How to remove the stands
1. Spread the protective sheet on the flat surface, such as a
desk.
2. Place monitor on the protective sheet.
3. Remove screws with a screwdriver and place them in a
safe place for reuse.
12. Connecting HDMI cable and Display
Port cable
Stands
(Longer portion
comes to the front.)
Screw holes for
MDT421S
Clamper
Use the clamper
to secure the
cable firmly.

English-12
13. When MDT421S is installed in portrait
position
Conditions
MDT421S can be installed in portrait position, under the fol-
lowing conditions:
Caution:
Portrait position is effective only when wall-mounted or
ceiling-mounted.
The stands (legs) can not be fitted to the monitor in portrait
position.
Placing the monitor in portrait position, will shorten the aver-
age life of the LCD backlight.
Operational Environment (Temperature) shall be limited, as
shown below:
Operational Environment:
Temperature 5 - 35 °C / 41 - 95 °F
Humidity 20 - 80 % (without condensation)
Please orientate the monitor in the direction shown below:
Do not place monitor in landscape in any other manner.
Optional speakers (SP-421S) can not be attached when this
LCD monitor is installed in portrait position.
How to set-up
The “ ” logo should be on the LEFT side when
facing the monitor.
MDT421S
MDT421S
90°
90°
Landscape
CounterclockwiseClockwise
14. For long-distance connection using
the CAT5 Kit
NOTE:
The CAT5 Kit is an option designed for MDT421S. For the de-
tailed mounting procedure, see the user’s guide for the CAT5
Kit (option).
CAT5 video connection
The CAT5 video connection function is for transmitting the
analog RGB video signal of the computer and the control
signal of the monitor over a long distance using CAT5 cables.
The computer can control the monitor via the optional CAT5
Tx BOX and the CAT5 Rx BOX that is mounted on MDT421S.
Caution:
Never connect network devices (such as a hub and a comput-
er for LAN) to the CAT5 IN and OUT connectors of the CAT5
Kit. If they are connected, the network devices themselves,
CAT5 Tx BOX, CAT5 Rx BOX, and monitor may be damaged.
1. Installation of the USB driver for CAT5
serial communication control
To connect the computer and the CAT5 Tx BOX via USB inter-
face, it is necessary to install the USB driver to the computer
from the CD-ROM supplied with the CAT5 Kit (option).
(When connecting the computer and the CAT5 Tx BOX via
RS-232C interface, you don’t have to install the USB driver.)
OS supported: Windows®XP, Windows Vista®
How to install:
1) Installation to Windows®XP
Start the “PL2303-Driver_XP2K_v******.exe” file in the
Windows XP folder on the CD-ROM supplied with the CAT5
Kit (option) and install the driver according to the instructions
displayed on the screen.
2) Installation to Windows Vista®
Start the “PL2303_Prolific_Vista_******.exe” file in the
Windows VISTA folder on the CD-ROM supplied with the
CAT5 Kit (option) and install the driver according to the in-
structions displayed on the screen.
2. Connection of the CAT5 video connec-
tion function
There are two cases of connection.
1) Connection to one monitor
Monitor with CAT5
Rx BOX (option)
Computer
USB cable
CAT5 cable
VGA (mini D-SUB 15-pin) cable (supplied)
CAT5 Tx BOX
(option)

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1. Connect the USB connector of the supplied CAT5 Tx BOX
and that of the computer using a commercially available
USB cable. (When the USB driver isn’t available, connect
an RS-232C cable in addition to the USB cable. In this
case, the USB cable serves for supplying the power to the
CAT5 Tx BOX.) See page 35.
2. Connect the D-SUB input connector of the CAT5 Tx BOX
and the VGA (D-SUB) output connector of the computer
using the signal cable (mini D-SUB 15-pin cable) supplied
with the monitor.
3. Connect the modular connector of the CAT5 Tx BOX and
the CAT5 (RGB5) IN connector of the CAT5 Rx BOX using
a commercially available CAT5 cable.
2) Connection to multiple monitors
1. In addition to the connection made step 1) above, con-
nect the CAT5 OUT connector of the first monitor and the
CAT5 (RGB5) IN connector of the second monitor using a
commercially available CAT5 cable.
2. Connect the third and later monitors in the same way.
You can connect up to 5 monitors.
Allowable cable length
Connection Max. cable length/signal timing
One monitor 150 m / 1920 x 1080 @60 Hz
Multiple moni-
tors
200 m / 1920 x 1080 @60 Hz
(Total length of the connected cables)
The lengths given above are based on the actual measure-
ments using our standard signal source and the recommend-
ed cable as follows. Before installation, check the monitor
operation in advance by connecting it with your computer and
cables.
Recommended cable:
8-pin modular connector, straight-through, shielded, Category
5 or 5e
Commercially available cables that passed the compatibility
test (Tested with shielded connectors commercially available.):
7929A of Belden, NFTP-C5e-GY of Nex1
3. Various settings involved in the CAT5
video connection
In the case of the CAT5 video connection, configure the fol-
lowing settings displayed on the OSD screen. (See page 29.)
1) CAT5 CABLE LENGTH
Select the cable length, and the defaults of all the adjustment
values are automatically determined.
Select the length that is closest to the actual length of your
cable.
2) CAT5 EQ
Make adjustment so that blur and smear of the displayed let-
ters and graphic objects are minimized.
3) CAT5 R-GAIN/G-GAIN/B-GAIN
When the displayed image is dark, increase each value.
When whites aren’t displayed as intended, adjust the R-GAIN
and B-GAIN values.
4) CAT5 R-SKEW/G-SKEW/B-SKEW
Adjust each value so that the color deviation in the displayed
letters and graphic objects is minimized.
Computer
VGA (mini D-SUB 15-pin)
cable (supplied)
CAT5 cable
Monitor with CAT5
Rx BOX (option)
Monitor supporting
Mitsubishi CAT5
CAT5 Tx BOX
(option)
USB cable
CAT5 cable

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3. Ventilation Requirements for enclosure
mounting
To allow heat to disperse, leave space between surrounding
objects as shown in the diagram below.
4. To avoid monitor from falling
When installing the monitor using the tabletop stands (op-
tional), take measures to prevent the monitor from falling over
in case of an earthquake or other disaster to lessen the prob-
ability of injury and damage resulting from fall.
As shown in the figure, secure the monitor to a solid wall or
pillar using rope (commercially available) strong enough to
bear the weight of the monitor. (MDT421S: approx. 27 kg (with
the optional stands))
When you use screw hooks (commercially available), ring
screw hooks, not C-shaped screw hooks (with opening), are
recommended.
Caution:
• The effectiveness of preventing from falling substantially
depends on the strength of brackets and base to which
prevention device from falling is attached. When you
cannot ensure sufficient strength, provide adequate
reinforcement.
• Though the recommended prevention from falling is
intended to lessen the probability of injury and damage, it
doesn’t assure its effectiveness against any kind of
earthquake or disaster.
• Do not sleep where the monitor may topple over or fall in
case of an earthquake or other disaster.
• Before moving the monitor, remove the rope that is
securing the monitor. Failure to do so may result in injury
or breakdown of the monitor.
You can attach mounting accessories to the LCD monitor in
one of the following two ways:
1. In the upright position
2. Lay the screen face down
Lay the protective sheet on a table, which was wrapped
around the monitor when it was packaged, beneath the
screen surface so as not to scratch the screen face.
This device cannot be used or installed without the Tabletop
Stand or other mounting accessory. Failure to follow correct
mounting procedures could result in damage to the equip-
ment or injury to the user or installer. Product warranty does
not cover damage caused by improper installation.
Failure to follow these recommendations could result in void-
ing your warranty.
Use M6 screws (having a length 10 mm longer than the thick-
ness of the mounting bracket) and tighten them securely.
Prevent the screws from loosening using spring washers,
etc. MITSUBISHI ELECTRIC recommends using mounting
interface that comply with TÜV-GS and/or UL1678 standard
in North America.
Caution:
For preventing the monitor from falling.
• Install the monitor with metal brackets for wall or ceiling
installation (commercially available) on your own respon-
sibility. For detailed procedures of installation, refer to the
instructions of the metal brackets.
• To lessen the probability of injury and damage resulting
from fall of the monitor in case of earthquake or other
disaster, be sure to consult the bracket manufacturer for
installation location.
• To lessen the risk of falling of the monitor, thread commer-
cially available rope through the handles at the right and
left of the monitor and secure the rope to the wall mount
brackets or ceiling mount brackets.
• Do not sleep where the monitor may topple over or fall in
case of an earthquake or other disaster.
How to Mount and Attach Options to the LCD Monitor
Screw Holes
400 mm Screw hook, etc.
commercially available
Clamper Screw
Rope, etc.
commercially available
482.8 482.8
100 100 100100
100100
279.3279.3
Table Handles Protective sheet
(mm)

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Connections
Before making connections:
* First turn off the power of all the attached equipment and make connections.
* Refer to the user manual included with each separate piece of equipment.
Wiring Diagram
LCD monitor
VCR
(RCA)
LCD monitor (second monitor)
Stereo amplifier
Personal
computer
(analog RGB)
Personal
computer
(DVI-D, DISPLAY PORT)
DVD player
(HDMI)
External speaker

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Connecting a Personal Computer
By connecting your computer to your LCD monitor, you can display images on your computer's screen.
Some video cards may not display an image correctly.
Connect the LCD Monitor to a Personal Computer
• To connect the computer to the RGB 3 IN connector (mini D-sub 15 pin) on the LCD monitor, use the supplied RGB signal
cable (mini D-sub 15 pin to mini D-sub 15 pin).
Select “RGB 3” using the INPUT button on the LCD monitor or the D-SUB button on the remote control.
• To connect the computer to the RGB 4 IN connector (BNC) on the LCD monitor, use a signal cable (mini D-sub 15 pin to
BNC x 5).
Select “RGB 4” using the INPUT button on the LCD monitor or the BNC button on the remote control.
• For audio input, select AUDIO IN 1, 2, or 3 using the AUDIO INPUT button.
• To connect a second LCD monitor, use the RGB OUT connector (mini D-sub 15 pin). (The RGB 3, RGB 4, or RGB 5 (option)
signal selected by the first LCD monitor is output.)
• To output audio to the second LCD monitor, use the AUDIO OUT connector.
RCA
Mini D-sub 15 pin
BNC x 5
LCD monitor PC or IBM compatible
Mini D-sub 15 pin
LCD monitor (second monitor)
Mini D-sub 15 pin
RCA
Mini D-sub 15 pin
To RGB output
To audio output