Barco MGD 521 M, MGD 521 MKII User Manual

V599326/Rev. 02
June 2003

BarcoView

Theodoor Sevenslaan 106
8500 Kortrijk, Belgium
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

http://www.barcoview.com

BarcoView Inc

3059 Premiere Parkway
Duluth, Georgia, 30097,USA
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

http://www.barcoview.com

MGD 521 M

MGD 521 MKII

Medical Greyscale

Displays

BarcoView LTD

16F-1, Cheng Loong Plaza 33, Min Sheng Road
Section 1, Pan Chiao, Taipei Hsien, Taiwan, R.O.C.
Phone: [phone]
Fax: [phone]

Installation & User Manual

© 2003 BARCO nv. All rights reserved.

Trademark information

TrueGrey, MediCal, BarcoMed, and MeDis are registered trademarks
of BARCO NV.

Windows NT is a registered trademark of Microsoft Corporation.

MGD 521 M - MKII User's Guide 3

MGD 521 M - MKII User's Guide 4

SAFETY INSTRUCTIONS

Regulations

 This apparatus conforms to: IEC601-1,
UL2601-1, cUL2601-1, EN 60601-1
 This apparatus is classified as Type B
without Applied Part.

Usage in Hazardous locations

 Class I equipment
 Equipment not suitable for use in the
presence of a flammable anaesthetic

mixture with air or with oxygen or nitrous
oxyde.

FCC notice

This equipment has been tested and found
to comply with the limits of a class A digital
device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide
reasonable protection against harmful
interference when the equipment is operated
in a commercial environment. This equipment
generates, uses and can radiate radio
frequency energy and, if not installed and
used in accordance with the instruction
manual, may cause harmful interference to
radio communications. Operation of this
equipment in a residential area is likely to
cause harmful interference in which case the
user will be required to correct the interference
at his own expense.

!

Power connection

 Power cord: Utilise a UL-listed detachable
power cord, 3-wire, type SJ or equivalent, 18
AWG min., rated 300 V min., provided with a
hospital-grade type plug 5-15P configuration
for 120V application, or 6-15P for 240V
application.
 Warning: This apparatus must be earthed!
 Power requirements: connect the apparatus

 Read the safety and operating instructions
before operating the apparatus.
 Retain safety and operating instructions for
future reference.
 Adhere to all warnings on the apparatus
and in the operating instructions manual.
 Follow all instructions for operation and
use.

to an AC voltage as indicated at its back.
Using a lower voltage, the apparatus will not
be able to operate. Using a higher voltage
may damage the apparatus.
If you are not sure of the type of power
supplied, consult the power company.
 Do not overload wall outlets and extension
cords as this may result in fire or electric
shock.
 Mains lead protection (U.S.: Power cord):
Supply cords should be routed so that they
are not likely to be walked upon or pinched by
items placed upon or against them, paying
particular attention to cords at plugs and
receptacles.

Water and moisture

 Never expose the apparatus to rain or
moisture.
 Never use the apparatus near water - e.g.
near a bathtub, washbasin, swimming pool,
kitchen sink, laundry tub or in a wet basement.

Ventilation

 Do not cover or block the ventilation openings
in the cover of the set. When installing the
apparatus in a cupboard or another closed
location, heed the necessary space between
the set and the sides of the cupboard.

Installation

 Place the apparatus on a flat, solid and
stable surface that can bear the weight of at
least 3 monitors. If you use an unstable cart
or stand, the set may fall, causing serious
injury to a child or adult, and seriousdamage
to the equipment.
More warnings in the Installation chapter.

MGD 521 M - MKII User's Guide 5

MGD 521 M - MKII User's Guide 6

CONTENTS

1. Introduction ..................................................................................................... 9

1.1 Overview .................................................................................................. 9

Resolution and bandwidths ....................................................................... 9

The memory system .................................................................................. 9

Image conformity and consistency ............................................................ 9

Calibration and adjustments ...................................................................... 9

Power saving system ............................................................................... 10

1.2 Versions and options .............................................................................. 10

1.3 About the manuals ................................................................................. 11

2. Installation ..................................................................................................... 12

2.1 Precautions ............................................................................................ 12

2.2 The package contents ............................................................................ 12

2.3 Controls and connectors ........................................................................ 13

2.4 Signal connection ................................................................................... 14

a) Connection of video signals ................................................................ 14

b) Connection of data signals .................................................................. 15

c) Connection of optical sensor ............................................................... 15

d) Connection of power ............................................................................ 16

2.5 Positioning the display ........................................................................... 16

Important considerations .............................................................................. 17

3. Operation: User controls ............................................................................... 18

3.1 Switching on / off .................................................................................... 18

3.2 Contrast and brightness control ............................................................. 19

3.3 Viewing Status information..................................................................... 21

3.4 Other adjustments .................................................................................. 22

4. Advanced settings and Adjustments (For service staff only) ........................ 23

4.1 Settings .................................................................................................. 23

4.2 Adjustments ............................................................................................ 25

a) How to make the adjustments ............................................................. 25

b) Description of the adjustments ............................................................ 25

Geometry ......................................................................................... 25

Focus ............................................................................................... 31

ALC (optional) .................................................................................. 31

Luminance uniformity....................................................................... 32

Factory reset .................................................................................... 32

c) How to save changes .......................................................................... 32

5. Maintenance ................................................................................................. 33

6. Troubleshooting ............................................................................................ 34

Appendix A: Background information ............................................................... 35

Appendix B: Technical specifications ............................................................... 37

MGD 521 M - MKII User's Guide 7

MGD 521 M - MKII User's Guide 8

1. INTRODUCTION

1.1 Overview

Resolution and bandwidths

The BARCO MGD 521 M and MGD 521 MKII displays are ultra-high
resolution, grayscale portrait displays. Their outstanding visual
performance, combining a 5 MegaPixel resolution with a very high
brightness, makes them ideal for diagnostic imaging and many other
medical and scientific applications.

The displays are compatible with any AC power system worldwide
and automatically synchronise to a wide range of sync frequencies.
their high-speed video amplifiers support pixel clocks up to 500 MHz
(MGD 521 M: 550 MHz).

The memory system

The internal memory system can contain the adjustments for 16
different scanning formats, the so-called scanning modes. Each
scanning format is characterized by its sync signals. The displays
internal micro controller continuously samples the connected sync
signals and compares them to the scanning modes already stored in
the memory. If the connected signal has already been stored, the
micro controller adapts the image to the corresponding adjustment
values in the memory, and further adjustments are unnecessary.

Image conformity and consistency

Image conformity and consistency are the keywords. In our factory,
the MGD 521 displays are perfectly adjusted and calibrated before
they are shipped to the customer. Internal circuits, like the TrueGrey®
and Automatic White Stability (AWS) systems, ensure display
consistency over time.

Conformity with the original image quality is guaranteed by the
automatic calibration, which can be done by means of an optical
sensor, connected to the Sensor connector on the display. The
sensor is not supplied with the display.

Calibration and adjustments

The conformity calibration, as well as the complete adjustment of the
display, can be performed by means of the remote, user-friendly
MediCal® software package. MediCal is especially developed to

Introduction 9

adjust and check BARCOs medical displays.
A lot of adjustments can also be done on the monitor itself, by means

of an extensive on-screen menu system, accessible from the rear
panel controls.

Power saving system

The MGD 521 displays are equipped with a power saving system.
When left idle for a certain time, the computer, connected to the
display, will power down the display in several steps. The power
saving system can be switched on or off during the installation or
adjustment of the display.
This system requires a computer imaging board that supports power
saving management.

1.2 Versions and options

MGD 521 M MGD 521 MKII

P45 phosphors ................ x .................................. x

P104 phosphors ....................................................x

50 Ohm input .................. x .................................. x

75 Ohm input .................. x .................................. x

Notes:

- The P45 phosphors produce rather bluish images, whereas the

P104 phosphors produce more yellowish images.

- A video input terminated to 50 Ohm requires an imaging board

with an impedance of 50 Ohm. A video input terminated to 75 Ohm
requires an imaging board with an impedance of 75 Ohm.

- The type of CRT phosphors and the video input termination are

indicated on the label at the rear of the display.

Important:
It is absolutely necessary that the impedances of imaging board and

display are the same. If not, the image quality will be inferior.

The MediCal software and the X-Rite DTP92 sensor are not delivered
with the display.

MediCal can be ordered separately.

Introduction 10

1.3 About the manuals

This guide is meant for people who want to install and use the MGD
521 displays, as well as people who need to install and adjust the
displays. Chapter 4, Adjustments, is meant for this second category
only, because it describes actions and procedures that require a
technical skill to be performed properly.

The use of the software MediCal is described in the MediCal Users
Manual.

Installation 11

2. INSTALLATION

2.1 Precautions

 Keep your original packaging. It is designed for this display and is

the ideal protection during transport.
 Do not lift the display all by yourself to avoid injury.
 Avoid reflections in the picture tube to reduce eye strain.
 Place the display on a strong and stable table or desk if used as

desktop display.
 Keep the display away from heat sources and provide enough

ventilation in case it is built in a rack or console.
 Keep the display away from strong sources of magnetic fields.
 Make sure the display and computer are both switched off before

connecting the signals.

2.2 The package contents

 The display
 The accessory box (in which you found this manual)

Notes:
 The display can be part of a complete MeDis

of the display itself, an imaging board and software. In that case,

the package contains a lot more items. The contents of the

package is then described in the manual of the complete system.
 The ambient light shield inside the accessory box should always

be used during conformity calibration with the X-Rite DTP92

optical sensor.

®

system, consisting

Installation 12

2.3 Controls and connectors

{1} Optical sensor plug
{2} Ambient Light Compensation

{3} Green power LED

{4} Control knob, combination of a

3

1

2

{5} Remote (RS-232) output
{6} Remote (RS-232) input
{7} Video input
{8} Horizontal / composite sync.

{9} Vertical sync. input
{10} Power input
{11} Power button

REMOTE OUT

REMOTE IN

4

5

VIDEO

HS / CS

VS

6
7
8

9
10

11

(ALC) sensor (optional)

push button and a turning
knob.
The control knob is used for
switching the power on/off,
and selecting and performing
functions in the OSD (on­screen display) menu.

input

Installation 13

2.4 Signal connection

a) Connection of video signals

The connected equipment must comply to all relevant safety

!

demands.
Important: The use of low-quality video cables can distort the video
signal and influence diagnosis.

1. Check the impedance of the imaging board that produces the

video signals you want to connect. It must be 50 or 75 Ohm (just

like the input of the display). If not, the quality of the images on the

display will be inferior.

2. Connect the video output of the computers imaging board to the

video and sync inputs on the displays rear panel. Use a proper

video cable. The video cable is not supplied with the display,

unless the display comes as part of a complete BARCO MeDis

system, that also contains an imaging board.

The inputs accept the following signals:
 Video with separate horizontal and vertical sync.

- The video cable has 3 wires.

- Connect the video signal to the connector Video {7}.

- Connect the horizontal sync signal to the connector HS/CS {8}.

- Connect the vertical sync signal to the connector VS {9}.

 Video with external composite sync.

- The video cable has 2 wires.

- Connect the video signal to the connector Video {7}.

- Connect the composite sync signal to the connector HS/CS {8}.

 Video with internal composite sync (sync on video).

- The video cable has 1 wire.

- Connect the video (with sync) signal to the connector Video {7}.

- The vertical sync pulse must be at least 2 lines long.

Notes:
 The video inputs cannot be connected in loop-through (daisy-

chain).
 The required video amplitude: 700 mV.
 The required sync. amplitude: 500 mV.

Installation 14

b) Connection of data signals

The display can be controlled remotely by a computer through the
serial data bus. A typical example of this, is the MediCal software that
controls the display. MediCal runs on a PC that is connected through
the serial data bus. This PC is not necessarily the same computer as
the one that produces the video signals.

Unlike the video signals, it is possible to daisy-chain the serial data
bus. This means you can control different displays from one PC.

To connect the data signals:

1. Connect one end of the serial data cable to one of the PCs COM

ports. If the COM port has a 25-pin connector, you will need to

use a D25-to-D9 interface connector. The cable and the interface

connector are both supplied with MediCal.

2. Connect the other end of the serial data cable to the Remote In

connector {6} on the displays rear panel.

3. For a daisy-chain application, connect the Remote Out connector

{5} of the first display to the Remote In connector {6} of the next

display.

c) Connection of optical sensor

To calibrate the display, connect the optical sensor
to the Sensor connector {1} at the front.

Notes:
 The display supports the DTP 92 from X-Rite

as optical sensor.
 The optical sensor is not supplied by BARCO.
 Calibration can be done by means of MediCal

only.
 Always use the Ambient Light Shield

during calibration.

Installation 15

1

At the front, the sensor plug
is located under the bezel.

d) Connection of power

1. Power cord: Utilize a UL-listed detachable power cord, 3-wire, type

SJ or equivalent, 18 AWG min., rated 300 V min., provided with a

hospital-grade type plug 5-15P configuration for 120V application,

or 6-15P for 240V application.

2. Plug one end of the power cord into the rear of the display

(connector LINE {10}). Plug the other end into a grounded AC

power outlet. The display automatically adapts to the voltage. The

voltage range is: 100-240 VAC +/- 10%.

2.5 Positioning the display

The tilt and swivel base allows you to adjust the height and viewing
angle of the display to obtain an optimal viewing comfort.

Installation 16

Important considerations

 The best environment for diagnostic imaging is one with

controlled and dimmed ambient light. The human eye's
sensitivity depends on the ambient light strength. It is most
sensitive to small contrast changes (or subtle image details)
at limited ambient light levels.

 The best ambient light level, expressed in Lux, depends on

the application. An office illumination typically requires 500
Lux. A dimmed environment, like a softcopy room, requires
less than 100 Lux.

 Using your display in a controlled and dimmed environment

also extends its lifetime, because the display can operate at
limited brightness and contrast. These levels correspond to
the calibrated position in most cases.

 A controlled ambient light environment implies the ambient

light is as constant as possible. Cover windows to keep out
the daylight. Avoid switching the lights and viewing boxes on
and off. A consistent environment results in more image
consistency and less eye fatigue.

 Avoid reflections in the picture tube. Provide indirect lighting.

Don't place the displays in front of or close to a light source
like a window or viewing box, although this may be very
tempting. As a rule of thumb, keep viewing boxes at least
one metre (3 feet) away from the displays.

Installation 17

3. OPERATION: USER CONTROLS

Important:
The best way to adjust and control the display is by using MediCal,

which displays the ideal test patterns for correct adjustment. However,
in case you do not dispose of MediCal, you can control and adjust the
display by means of the built-in On-Screen Display (OSD).

3.1 Switching on / off

Power on/off

Press the Power button {11} on the rear panel to switch on the
display. The green LED at the front is off when the display is

operating.

If the display starts up with no image and the green LED {3} on, it is in
stand-by. This is the case when the display was powered down while
in stand-by.

Manual stand-by

To put the display in manual stand-by mode, press the control knob

{4} shortly. As a result, the green LED is ON continuously.
Note: You cannot switch the display in manual stand-by when the on-

screen display (OSD) is visible. In that case, first exit the OSD, and
then press the control knob to switch to stand-by mode.

To activate the display from stand-by mode, press the control knob
{4} again. As a result, the LED is switched off again.

Automatic power saving system (DPMS)

The power saving system, if switched on, can power down the display
when you don't use the computer that produces the video and sync.
signals for a while. In that way, the system reduces the display's
power consumption.

While the display is powered down, the picture tube will be blanked,
and the green LED on the front is on.

The power saving system is switched off when the display is
produced. It can be switched on by a qualified technician.

Note: The power saving system can only work if the connected
imaging board supports power management.

For more details, please read Appendix A, "Background information".

Operation 18

3.2 Contrast and brightness control

Contrast and brightness can be controlled through the OSD menus.

To activate the OSD

Turn the control knob {4} from left to right or from right to left. As a
result, the OSD main menu appears.

Note: The control knob should turn over at least 30 degrees before
the OSD becomes visible.

MAIN MENU

- Contrast CAL

- Brightness CAL

- Status information

- Settings

- Adjustments

- Exit

The OSD main menu

The main menu indicates the current setting for contrast and
brightness.

This can be:
 CAL: The calibrated position. This is the preferred setting in a

controlled environment.

 ALC: This indicates the Ambient Light Compensation (ALC) is on,

and contrast and brightness are controlled automatically,
depending on the ambient light. ALC is an option.

 <empty> When the main menu does not specify a setting,

contrast or brightness is manually set to a
different value than the calibrated position.

To put contrast in calibrated position

1 Turn the control knob to select Contrast in the OSD main menu.
2 Press the control knob shortly. The contrast control menu appears.
3 In the contrast control menu, select Contrast CAL position and

press the control knob shortly.

Contrast

- Contrast CAL position

- Manual contrast adjustment

- Exit

Contrast control menu

Operation 19

To control contrast manually

1 Turn the control knob to select Contrast in the OSD main menu.
2 Press the control knob shortly. The contrast control menu appears.
3 In the contrast control menu, select Manual contrast adjustment

and press the control knob shortly. The contrast scroll bar appears.
4 Turn the control knob until you have reached the desired contrast.
5 Press the control knob shortly or wait a few seconds to return to

the contrast control menu.
6 In the contrast control menu, select Exit and press the control

knob shortly to return to the main menu. Alternatively, you can just

wait a few seconds, and the OSD returns to the previous menu

automatically.

Contrast

Contrast scroll bar. The short stroke in the bar indicates
the calibrated position, the long stroke indicates the
current setting.

To put brightness in calibrated position

1 Turn the control knob to select Brightness in the OSD main menu.
2 Press the control knob shortly. The brightness control menu

appears.
3 In the brightness control menu, select Brightness CAL position

and press the control knob shortly.

Brightness

- Brightness CAL position

-

Manual Brightness adjustment

- Exit Brightness control menu

To control brightness manually

1 Turn the control knob to select Brightness in the OSD main menu.
2 Press the control knob shortly. The brightness control menu

appears.
3 In the brightness control menu, select Manual brightness

adjustment and press the control knob shortly. The brightness

scroll bar appears.

Brightness

Brightness scroll bar. The short stroke in the bar
indicates the calibrated position, the long stroke
indicates the current setting.

Operation 20

4 Turn the control knob until you have reached the desired

brightness.
5 Press the control knob shortly or wait a few seconds to return to

the brightness control menu.
6 In the brightness control menu, select Exit and press the control

knob shortly to return to the main menu. Alternatively, you can just

wait a few seconds, and the OSD returns to the previous menu

automatically.

3.3 Viewing Status information

You can view the status and actual settings of the display. You cannot
change them in the Status Menu. Changing the settings is reserved
for trained service staff only.

To view the status information

Turn the control knob to select Status information in the OSD main
menu.

The Status information menu appears. The only control in the menu is
Exit.

STATUS INFORMATION

Display Name: MGD 521MKII
Serial Number: 5114147
Mode Name: New mode
Mode H-frequency: 175.32 kHz
Mode V-frequency: 79.94 Hz
Software Version: V 1.01
Run time: 50 hours
White level: 300 cd/m2
Activity timeout 30s
SH compensation OFF
Actual H-frequency:125.30kHz
Actual V-frequency: 80.00 Hz

- Exit

Example of Status information menu
for MGD 521 MKII displays

Explanation of the Status information menu items

Display Name:

This is the display type.

Serial Number:

This is the display's serial number.

Mode Name:

The currently selected scanning mode.

Mode H-frequency, Mode V-frequency:

These are the horizontal and vertical sync frequencies of the currently
selected scanning mode. These are the figures stored in the memory.

Operation 21

Software Version:

The internal software version.

Run time:

The total operating time since production, including burn-in time.

White level:

The displays white level or light output after calibration, in calibrated
position.

Activity timeout :

This is the time, expressed in seconds, before the display interrupts
the data communication with the computer (e.g. during a computer
session with MediCal) if the computer does not respond anymore.

SH compensation (optional):

Indicates if Southern Hemisphere compensation is switched on or off.
Note: Southern Hemisphere compensation is an option. If the option
is not installed in the display, this line does not appear in the menu.

Actual H-frequency, Actual V-frequency:

These are the actual horizontal and vertical sync frequencies of the
connected video signal. They are measured constantly by the display.

3.4 Other adjustments

The main menu items Settings and Adjustments are reserved for
trained service staff and are therefore password - protected.

Operation 22

4. ADVANCED SETTINGS AND ADJUSTMENTS (FOR SERVICE STAFF ONLY)

Important:

The functions and controls described in this chapter can have a
serious impact on the performance of the display. They should be
touched by trained service staff only!

4.1 Settings

SETTINGS INFORMATION

- LUC OFF

- ALC OFF

- Orbiter OFF

- Power save ON

- Display address 1

- User controls disable OFF

- Exit

To change the settings

1 Turn the control knob at the rear from left to right or from right to

left to activate the On-Screen Display (OSD) main menu.

2 In the main menu, turn the control knob to select Settings.
3 Press and hold the control knob for a few seconds.

The Settings menu appears. It displays each setting and its current
status.
Note: If you press only shortly, the message "Service protected"

appears.
4 Turn the control knob to select the setting you want to change.
5 Press the control knob shortly to change the selected setting.
6 For Display address, you can change the setting by turning the

control knob. Return to the Settings menu by pressing the control

knob.

For the other settings, the new status instantly appears in the

Settings menu.

The Settings menu

Advanced 23

Explanation of the Settings menu items

LUC:

LUC is short for Luminance Uniformity Control. When switched on, the
internal waveform processor will modulate the gain of the video
amplifier so that the luminance is equal all over the screen (within a
tolerance of +/- 5%).

The LUC system can be calibrated in the Adjustments menu (see
further).

ALC (optional):

ALC is short for Ambient Light Compensation. When this setting is on,
the contrast is controlled automatically, depending on the ambient
light, measured by the ALC sensor {2} in the bezel.

Orbiter:

The Orbiter is an internal circuit that, when switched on, will slightly
and slowly move the image to prevent pixel burn-in.

Power save:

This setting can switch the automatic power saving system (see
Introduction chapter) on or off.

Display address:

In multi-head systems (multiple displays controlled by one system),
each display must have a different address. With this setting you can
set the display address from 1 to 16.

User controls disable:

With this setting you can enable or disable the user controls.
When OFF, the user controls are not disabled, and the user can

activate and use the OSD menus.
When ON, the user controls are disabled. After quitting the OSD, the

user will no longer be able to activate the OSD.
To activate the OSD again when the user controls are disabled,

use the following "code":
1 Turn the control knob 3 times counter-clockwise (seen from the

rear).
2 Turn the control knob 3 times clockwise.
3 Turn the control knob 3 times counter-clockwise.
Note: This should be done in quite a short time!

Saving the settings

The settings are automatically saved after changing them.

Advanced 24

4.2 Adjustments

a) How to make the adjustments

1 Turn the control knob at the rear from left to right or from right to

left to activate the On-Screen Display (OSD) main menu.
2 In the main menu, turn the control knob to select Adjustments.
3 Press the control knob for a few seconds.

The Adjustments menu appears.

Note: If you press only shortly, the message "Service protected"

appears.
4 Turn the control knob to select the category of adjustments you

want to make.
5 Press the control knob shortly to enter the selected category.
6 In the selected menu, select the adjustment you want to make and

press the control knob shortly to display the adjustment scroll bar.
7 Turn the control knob to perform the adjustment. After adjusting,

press the knob shortly to confirm the adjustment and return to the

menu, or press for a longer time to undo the adjustment and return

to the menu.
8 Return to the previous menu by pressing the control knob shortly

or selecting Exit when present.

b) Description of the adjustments

ADJUSTMENTS

- Geometry

- Focus

- ALC

- Luminance uniformity

- Factory reset

- Exit

Geometry

Rotation

Adjustments menu

Advanced 25

Width

Horizontal position

Height

Vertical position

Blanking - Blanking left

Blanking - Blanking right

Blanking - Blanking top

Advanced 26

Interlacing - Pre correction

In most cases you do not need to change this adjustment.
You may need to increase this adjustment only when the connected

video and sync signal contains an abnormally big number of
equalization pulses before the vertical sync (more than 8 lines),
resulting in a phase error (geometry distortion) at the bottom of the
image.

Interlacing - Post correction

In most cases you do not need to change this adjustment.
You may need to increase this adjustment only when the connected

video and sync signal contains an abnormally big number of
equalization pulses after the vertical sync (more than 8 lines),
resulting in a phase error (geometry distortion) at the top of the image.

SH Compensation (optional)

If your display is equipped with the Southern Hemisphere option, the
on-screen display menu contains additional functions to adjust the
image geometry. If the option is not installed in the display, this menu
does not appear.

SH Compensation - SH Compensation ON/OFF

For proper geometry adjustment in the Southern Hemisphere, you
must switch SH Compensation ON. If not, the SH controls will not
function.

SH Compensation: SH Top

SH Compensation: SH Bottom

Advanced 27

SH Compensation: SH Position

With SH Compensation on, we advise to use the SH Position control
instead of the Horizontal Position control in the Geometry menu.

Advanced geometry - Horizontal skewing

Advanced geometry - Horizontal bowing

Advanced geometry - Horizontal trapezium

Advanced geometry - Horizontal parabola

Advanced geometry - Corner top left

Advanced 28

Advanced geometry - Corner top right

Advanced geometry - Corner bottom left

Advanced geometry - Corner bottom right

Advanced geometry - Linearity & S-correction ­Horizontal linearity

Advanced geometry - Linearity & S-correction ­Horizontal S-corr

Advanced geometry - Linearity & S-correction ­Vertical linearity

Advanced 29

Advanced geometry - Linearity & S-correction ­Vertical S-corr

Advanced geometry - Advanced bowing & skewing ­Horizontal bowing left

Advanced geometry - Advanced bowing & skewing ­Horizontal bowing right

Advanced geometry - Advanced bowing & skewing ­Horizontal skewing left

Advanced geometry - Advanced bowing & skewing ­Horizontal skewing right

Advanced 30

Focus

Static focus

Adjust Static focus to obtain an image as sharp as possible in the
center.

Focus zone

You can adjust the focus in 25 independent zones. Turn the control
knob to obtain an image as sharp as possible in the selected zone.
Press the control knob to switch to the next zone.

ALC (optional)

Ambient Light Compensation (ALC) is an optional system that
automatically adapts the display contrast and brightness level to the
ambient light in the room. The system has to be adjusted by setting
the contrast and brightness in the darkest ambient light conditions the
user works, and then repeating this in the brightest conditions.

To adjust the ALC system, proceed as follows:

1. Dim the light in the room to create the darkest ambient light

condition the user normally works in.

2. Enter the Minimum illuminance menu.

3. Select Measure ambient light. The display now stores the

ambient light level that corresponds to the darkest condition.

4. Select Contrast and set the display contrast to the desired level.

5. Select Brightness and set the display brightness to the desired

level.

6. Exit the Minimum illuminance menu.

7. Increase the light in the room to create the brightest ambient light

condition the user normally works in.

8. Enter the Maximum illuminance menu.

9. Select Measure ambient light. The display now stores the

ambient light level that corresponds to the brightest condition.

10. Select Contrast and set the display contrast to the desired level.

11. Select Brightness and set the display brightness to the desired

level.

12. Exit the Maximum illuminance menu.

Advanced 31

Luminance uniformity

This menu allows you to calibrate the display, including the
Luminance Uniformity circuit.

Proceed as follows:
1 Connect the X-Rite DTP92 sensor and apply the black shield (see

chapter "Installation").
2 Follow the instructions on the screen.

Factory reset

This function allows you to undo all adjustments you have made since
the display left the factory.

Select Go ahead to restore the factory settings.
Select Exit to return to the previous menu without erasing the

adjustments.

c) How to save changes

Proceed as follows:

1 After having made the adjustments, select Exit in each appearing

menu until the Save Changes? message appears.
2 Select Yes to save the changes.

Select No to exit the OSD menus without saving the changes.

What happens upon saving?

 When the current scanning mode was already stored in the display

memory, the scanning mode is updated with the new adjustment

values.
 When the scanning mode was not yet stored in the memory, the

display will create a new scanning mode in the memory.

However, when the memory was full, the monitor will display a list

of scanning modes in the memory and ask if you wish to overwrite

one of them. If you want to store the adjustments you have made,

you will have to overwrite one of the scanning modes in memory.

Advanced 32

5. MAINTENANCE

Picture tube

The glass panel of the picture tube is handled with a special coating.
Take care not to damage or scratch the coating.

Clean the picture tube with a soft woolen or cotton cloth.
The cloth should be moist, not wet!
Use a watery solution or a mild commercial glass cleaning solution.
Apply (e.g., spray) the solution on the cloth, not on the picture tube.

Cabinet

Clean the cabinet using a recognized cleaning product for medical
equipment. The cloth you use must be moist, not wet!

The cabinet has been tested for resistance to the following products:
Cidex, Betadine, Alcohol (Isopropyl and Ethyl), Ammonia-based
cleaners (Windex) and Aquasonic Gel.

Maintenance 33

6. TROUBLESHOOTING

There appears no image on the picture tube, the green LED at
the front is out

 Check if the power cord is properly connected to the power outlet

and to the display.
 Check if the power button is switched on.

There appears no image, the green LED is on

The display is switched in Stand-by, manually or by the automatic
Power saving system.

 Press the control knob at the rear shortly.
 Try to switch on the display by pressing any key on the keyboard

of the computer that produces the video and sync. signals for the

display.
 Check if both horizontal and vertical sync. signals are connected to

the display and to the computer.

On the picture tube appears the message "No Valid Sync
Signal"

 Check if both horizontal and vertical sync. signals are connected to

the display and to the computer.
 Check if the sync. signals are connected in the proper way (refer to

the chapter "Installation").
 Check if both horizontal and vertical sync. frequencies match the

display specifications (refer to the chapter "Technical

specifications").

For other problems, please consult your technical service department.

Troubleshooting 34

APPENDIX A: BACKGROUND INFORMATION

Luminance Uniformity Correction

A characteristic (or limitation) of every picture tube (CRT) is that the
luminance decreases towards the edge of the screen surface. The
decrease is normally 20 to 30 %.

This is caused by the shape of the picture tube. Inside the CRT, a so­called electron gun shoots an electron beam towards the front (the
glass panel). Because this panel is rather flat instead of having a
spheric shape, the electron beam has to 'travel' a longer distance in
the corners than in the center. So the intensity is higher in the center.

This phenomenon is even increased by the irregular distribution of the
phosphor and aluminium layer on the glass panel. These tend to be
thicker in the center.

BARCO has developed a special system, called Luminance
Uniformity Correction (LUC), that solves this problem. The LUC
system enhances the light output at the edges of the CRT, so that the
luminance there is the same as in the center.

The LUC system is calibrated in the factory. From time to time, it has
to be re-calibrated at the customer's site by means of the light sensor
you use for normal color calibration. The system can be calibrated
and switched on or off by a qualified technician.

Power saving system

The display is equipped with circuits that can handle power saving
management. When the system is switched on, it can power down the
display in several steps.

The system is controlled by the imaging board or the PC that delivers
the video signals. When you are working on the computer, the
imaging board delivers both sync signals, and the display is operating
normally. When you don't touch the computer keyboard for a certain
time, the imaging board only delivers vertical sync. This is sensed by
the display's micro controller, that blanks the image on the CRT. This
results in a drop of power consumption with about 25 %.

When you leave the computer idle for a longer period, the imaging
board now delivers horizontal sync only. As a result, the display's
micro controller switches off a number of internal circuits. The power
consumption has now dropped with about 42 %.

Background information 35

At last, the imaging board delivers no sync signals at all, and the
micro-controller switches off all but one power supplies in the display.
Only the micro-controller's own supply keeps on running, resulting in
a very low power consumption of 5 W.

If you start using the computer again, the imaging board switches on
both sync signals, and the micro-controller switches on the display.

The times after which the different steps of power management must
become active, is set in the PC's display properties.

Background information 36

APPENDIX B:
TECHNICAL SPECIFICATIONS

Picture tube:

Faceplate transmission: +/- 32%
Faceplate type: ARC panel
Image representation: portrait
Phosphor: P45 (standard) or P104 (option
for MGD 521 MKII only)

Light output: (P45 phosphor)
MGD 521: Calibrated: 300 Cd/m2

MGD 521M: Calibrated: 400 Cd/m2

Peak: 600 Cd/m2

Resolution:

Max. adress. pixels: 2048
Max. adress. lines: 2560

Scanning systems

Horizontal scanning:

Multi sync: µ-controller controlled
Minimum frequency: 160 kHz
Maximum frequency: 200 kHz
Minimum blanking : 1.28 µs
Storable scan frequencies: 16
Prealigned scans: 1 or 2

Vertical scanning:

Minimum frequency: 48 Hz
Maximum frequency: 150 Hz
Minimum blanking: 250 µs (after leading
edge)

Power supply:

Voltage: 100 - 240 V +/- 10%
Frequency: 50/60 Hz
Current: 2.3 A

Environmental

Temperature range (°C):

Storage: -20/+65
Operation: 0/+45
Within specs: 15/+30

Altitude: storage: 25 000 ft

operational: 10 000 ft

Humidity (relative): 95 % max., non
condensing

Weight:

UnpackedPacked

39.8 kg 58.3 kg

Dimensions packing:

H x W x D: 788mm x 630mm x 780mm

Dimensions monitor (mm):

Height: 558
Width: 400
Depth: 561

Geometry

Nominal size (4/3 ratio): 300mm x 400mm
Nominal size (4/5 ratio): 304mm x 380mm

Inputs

Video

BNC connectors
Nominal level: 0.7 Vpp

Sync

BNC connectors
Nominal level: 0.5 Vpp

Communication inputs/outputs

RS232 9-pin sub D connector
Baudrate: 9600

Modifications reserved.

Technical specifications 37