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Solutions for Demanding Applications
VarTech Systems Inc.
Industrial CRT and Flat Panel Displays
VT20A
20” Auto Sync Color Monitor 15 to 50kHz
For Models:
VT20A-C · VT20A-CH · VT20A-CY
VT20A-R · VT20A-RH · VT20A-M
User’s Guide
Read these instructions completely before attempting to operate your new Color Display.
20” Slow Scan User Guide 150-082
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TABLE OF CONTENTS
Sections Page
1.0 Warning FCC Statement 1-3
Warning and Caution 1-2
FCC Statement 3
2.0 Connections 4-5
Video Connectors 4
Timing 5
3.0 Controls 6-7
User Controls 6
Screen Control Definitions 7
4.0 Power Management 8
5.0 Troubleshooting 9
6.0 Mechanical Drawings 10-17
VT20A-C Mechanical 11-12
VT20A-CH Mechanical 13
VT20A-CY Mechanical
VT20A-R Mechanical 14
VT20A-RH Mechanical 15
VT20A-M Mechanical 16-17
7.0 Specifications 18
20” Slow Scan User Guide 150-082
Page 3
Section
WARNINGS and FCC Statement
WARNINGS and FCC Statement
1
WARNING
TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS MONITOR TO RAIN OR
MOISTURE.
“HIGH VOLTAGE EXISTS ON THE CATHODE-RAY TUBE ANODE
LEAD OF THIS MONITOR. BEFORE SERVICING, DETERMINE THE PRESENCE OF HIGH
VOLTAGE BY CONNECTING THE H.V. METER BETWEEN THE ANODE OF CRT CAP AND
CHASSIS ONLY.”
CAUTION
1. Keep monitor away from excessive dust, high temperature, moisture or direct sunlight.
2. Use in well ventilated area and do not cover ventilation openings.
3. Unauthorized modifications of this equipment or substitution or attachment of not shielded
connecting cable may cause excessive interference.
4. When the monitor is not in use for a long time, turn off power switch.
RISK OF ELECTRIC SHOCK!
DO NOT OPEN!
WARRANTY VOID IF CASING
IS REMOVED.
CAUTION: To reduce the risk of electric shock, do not remove cover (or back).
No user serviceable parts inside. Refer servicing to qualified technician.
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IMPORTANT SAFETY INSTRUCTIONS
Prior to using this product, please ensure that you have carefully followed all the procedures outlined in the
user’s manual for this product.
1. Read all of these instructions.
2. Save these instructions for later use.
3. Follow all warnings and instructions marked on the product.
4. Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners.
Use a damp cloth for cleaning.
5. Do not use this product near water.
6. Do not place this product on an unstable cart, stand or table. The product may fall causing serious
damage to the product.
7. Slots and openings in the cabinet and the back or bottom are provided for ventilation; to ensure reliable
operation of the product and to protect it from overheating, those openings must not be blocked or
covered. The openings should never be blocked by placing the product on a bed, sofa, rug, or other
similar surface. This product should never be placed near or over a radiator or heat register. This product
should not be placed in a built-in installation unless proper ventilation is provided.
8. This product should be operated from the type of power source indicated on the marketing label. If you
are not sure of the type of power available, consult your dealer or local power company.
9. This product is equipped with a 3-wire grounding type plug, a plug having a third (grounding) pin. This
plug will only fit into a grounding-type power outlet. This is a safety feature. If you are unable to insert the
plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the purpose of
grounding -type plug.
10. Do not allow anything to rest on the power cord. Do not locate this product where persons will walk on the
cord.
11. If an extension cord is used with this product, make sure that the total of the ampere ratings on the
products plugged into the extension cord do not exceed the extension cord ampere rating. Also, make
sure that the total of all products plugged into the wall outlet does not exceed 15 amperes.
12. Never push objects of any kind into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock. Never spill liquid of any
kind on the product.
13. Do not attempt to service this product yourself, as opening or removing covers may expose you to
dangerous voltage points or other risks. Refer all servicing to service personnel.
14. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions:
A. When the power cord or plug is damaged or frayed.
B. If liquid has been spilled into the product.
C. If the product has been exposed to rain or water.
D. If the product does not operate normally when the operating instructions are followed.
Adjust only those controls that are covered by the operating instructions since improper
adjustment of other controls may result in damage and will often require extensive work by
a qualified technician to restore the product to normal operation.
E. If the product has been dropped or the cabinet has been damaged.
F. If the product exhibits a distinct change in performance, indicating a need for service.
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Page 5
Federal Communications Commission Requirements
The equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of FCC rules. These limits are designed to provide reasonable protection
against harmful interference in an industrial installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in strict 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 measure:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Shielded interconnected cables and shield power cords must be employed with
this equipment to insure compliance with the pertinent RFD emission limits
governing this device.
Changes or modifications not expressly approved by the manufacturer could void the user's
authority to operate the equipment.
Notice of Compliance with Canadian Interference-causing Equipment Regulations
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
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Page 6
Section
2
15 Pin D CONNECTOR:
This is an industry standard connector providing easy connection
to VGA type video sources.
Pin Function Pin Function
1 Red Video In 8 Blue Return
2 Green Video In 9 +5V
CONNECTORS
CONNECTORS
1
15
3 Blue Video In 10 Ground
4 GND 11 Ground
5 Self Test 12 SDA
6 Red Return 13 Horizontal sync
7 Green Return 14 Vertical sync
15 SCL
9 Pin D CONNECTOR:
Pin CGA Function EGA Function
1 Ground Ground
2
3
4
5
NC Red Intensity
Red Red
Green Green
Blue Blue
HD15 Connector
1
9
CGA/EGA TTL INPUT
Standard for VT20A-CH
and VT20A-RH
6
7
8
9
20” Slow Scan User Guide 150-082
Intensity Green Intensity
NC Blue Intensity
Horizontal Sync Horizontal Sync
Vertical Sync Vertical Sync
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Timings
VGA1 640 X 350 VGA2 720 X 400 VGA3 640 X 480 MAC35k
Mode 1 2 3 4
Hor. Freq (kHz) 31.468 31.468 31.468 34.975
Vert. Freq. (Hz) 70.09 70.09 59.94 66.62
Dot Clock (MHz) 25.175 28.322 25.175 31.3344
Hor. Total Time 31.778 31.778 31.778 28.59
Hor. Active Time (us) 26.058 26.058 26.058 20.421
Front Porch (us) 0.318 0.318 0.318 2.553
SYNC Pulse Width (us) 3.81 3.81 3.81 2.042
Back Porch (us) 1.589 1.589 1.589 3.574
Border (us) 0.32 0.32 0.32 0
Vert.Total Time (ms) 14.268 14.268 16.683 15.01
Vert. Active Time (ms) 11.504 13.156 15.762 13.723
Front Porch (ms) 0.985 0.159 0.064 0.086
SYNC Pulse Width (ms) 0.06356 0.06356 0.06356 0.086
Back Porch (ms) 1.716 0.889 0.794 1.115
Border (ms) 0.191 0.222 0.254 0
SYNC Polarity (H,V) +,- -,+ -,- -,-
Timings
MAC 49.7K VESA 56.5K 64K
Mode 5 6 7
Hor.Freq. (KHz) 49.722 56.476 64.02
Vert. Freq. (Hz) 74.543 70.069 60.00
Dot Clock (MHz) 57.28 75.00 110.00
Hor.Total Time (us) 20.112 17.707 15.625
Hor. Active Time (us) 14.525 13.653 11.625
Front Porch (us) 0.559 0.32 0.300
SYNC Pulse Width (us) 1.117 1.813 1.600
Back Porch (us) 3.911 1.920 2.100
Border (us) 0 0 0
Vert. Total Time (ms) 13.415 14.272 16.670
Vert. Active Time (ms) 12.550 13.599 16.000
Front Porch (ms) 0.02 0.053 0.031
SYNC Pulse Width (ms) 0.06 0.106 0.047
Back Porch (ms) 0.784 0.513 0.594
Border (ms) 0 0 0
SYNC Polarity (H,V) -,- -,- +,+
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Page 8
Section
3
CONTROL LOCATION
NOTE: VT20A-C, VT20A-CH, VT20A-R,
All controls are located on the right side of the monitor.
VT20B-R, VT20A-RH, VT20A-M
All controls are located on the front of the monitor.
CONTROLS
CONTROLS
VarTech
1 2 3
OSD (On Screen Display menu) CONTROLS AND ADJUSTMENTS:
There are four switches on the control panel with Key Function:
Feature Function
1 MENU Call the Main-Menu OSD
2 SEL Select different OSD functions
3 UP Change the setting of the selected OSD function.
4 DOWN Change the setting of the selected OSD function.
USER CONTROLS
Power control Push the switch
Power indicator
The power LED is green when the display is in normal operation.
Degauss switch
This monitor is equipped with automatic and manual OSD degaussing. Automatic degaussing is
operativewhen the monitor is cold (after being off for approximately 20 minutes). Therefore, if the monitor is
repositioned while it is warm and discoloration is observed, it is important to remember to turn off the monitor
and let it cool. When powering the monitor back on, it will then degauss automatically and discoloration will
disappear. Manual degaussing is operative by selecting the OSD degauss function.
Caution: Please allow a minimum of 20 minutes to elapse between uses of the degauss function.
4
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SCREEN CONTROL DEFINITIONS
Feature Function
Brightness
Contrast
V-center
V-size
H-phase
H-size
Pincusion
Trapezoid
Pin balance
Parallel
Rotation
OSD H-position
OSD V-position
To adjust the overall screen intensity
To adjust the intensity difference between the video image and the background
display raster
To adjust the vertical position of the display image
To adjust the vertical size of the display image
To adjust the horizontal position of the display image
To adjust the horizontal size of the display image
To adjust the bowing of the display image size
To adjust the size difference between the top and bottom of the display image
To adjust the ratio of the size pincushion adjustments of the display image
To adjust the rectangular shape of the display image
To adjust the display image tilt
To adjust the horizontal position of the OSD control
To adjust the vertical position of the OSD control
OSD timer
Top corner
Bottom corner
V-focus
H-focus
V-linearity
H-linearity
Information
Recall
Degauss
R,G,B user color adjust
6500K color select
9300K color select
To adjust the time duration of the OSD control until it is turned off
To adjust the symmetry of the top two display corners
To adjust the symmetry of the bottom tow display corners
To adjust the vertical focus of the display image
To adjust the horizontal focus of the display image
To adjust the vertical linearity of the display image
To adjust the horizontal linearity of the display image
To display input video signal specifications
To recall a previous stored setup
To degauss the CRT in order to correct for image purity
To adjust the individual color balances
To select the 6500K color balance
To select the 9300K color balance
OSD Exit
20” Slow Scan User Guide 150-082
To exit the OSD controls
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Page 10
Section
POWER MANAGEMENT
POWER MANAGEMENT
4
POWER MANAGEMENT FUNCTION
The Power Management function, which is controllable through the required software, provides four
distinct power states:
DISPLAY POWER MANAGEMENT SIGNALING (DPMS)
Mode Function
On Normal operation; screen stays on. Power LED is green.
Standby Screen blanks after preset idle time. Power LED of Display is Yellow.
Suspend Some electronic circuits go off after a preset idle time.
Power LED is Yellow.
Off Display power is off after preset idle time or when system is powered off.
Power LED is Amber.
Power Consumption
The following is a description of these power states and the power consumed state:
Mode H-sync V-sync Video Power Consumption
On Pulse Pulse Active Pw (maximum)
Standby No pulse Pulse Blanked <30 Watts
Suspend Pulse No pulse Blanked <30 Watts
Off No pulse No pulse Blanked <15 Watts
NOTE:
1. The power management function requires TTL horizontal and vertical sync.
2.
This monitor is Energy Star compliant when used with a computer equipped with DPMS.
REINITIALIZING POWER
To reactivate a display that had gone inactive under its Power Management function, do one of the
following:
1. If the display has powered off under its Power Management function due to the system unit being
switched off, you must power up the system unit to reactivate the display.
2. If the display has deactivated under its Power Management function due to exceeding a pre-set
idle time, you may reactivate the display by any one of the following:
- press any key on the keyboard
- move the mouse (if so equipped)
- press any segment on the TouchSelect panel (if so equipped).
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Page 11
Section
TROUBLESHOOTING
TROUBLESHOOTING
5
In the event that you experience trouble with your Display, check the following items before
contacting Vartech Systems. The most common problems usually involve an incorrectly
configured Video Card or an incorrect connection from the Video Card to the Display. Do not
exceed the maximum refresh rate recommended for the display.
TROUBLESHOOTING GUIDE
Problem Troubleshooting Tips
No image on display screen
Picture is small or distorted and
Control Buttons will not correct
1. Check that power cord of the Display has been
connected securely into wall outlet or grounded
extension cable or strip.
2. Check that power switch of the Display has been
pressed and LED on front of Display is lit.
3. Check that Video (Signal) Cable from the Display has
been securely and correctly connected to the 15-pin
Video Connector on the rear panel of the Computer.
4. Check that Video Card is firmly seated in card slot of
Computer motherboard.
5. Check that the Brightness and/or the Contrast
adjustments of the Display have not been turned down
to minimum levels.
1. Check that the video signal being input from the Video
Card falls within the frequency range of the Display.
2. Check that Video (Signal) Cable from the Display has
been securely and correctly connected to the 15-pin
Video Connector on the rear panel of the Computer.
3. If you have used an adapter to convert the 15-pin Video
(Signal) Cable Connector from the Display to fit the
connector on the rear of the Computer, check that the
pin assignment of the adapter matches that of the
15-pin Mini D-Sub pin assignment of the Display.
Colors of image on screen are
abnormal
20” Slow Scan User Guide 150-082
1. Check that a magnetized item is not nearby.
2. Check that Video (Signal) Cable from the Display has
been securely and correctly connected to the 15-pin
Video Connector on the rear panel of the Computer.
3. If you have used an adapter to convert the 15-pin Video
(Signal) Cable Connector from the Display to fit the
connector on the rear of the Computer, check that the
pin assignment of the adapter matches that of the
15-pin Mini D-Sub pin assignment of the Display.
4. Press and release Degauss button on the Display.
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Page 12
Section
MOUNTING INSTRUCTIONS
MOUNTING INSTRUCTIONS
7
Mechanical Drawings
Model Description Page(s)
VT20A-C 20” Chassis Mount Mechanical Drawing 11-12
VT20A-CH 20” Honeywell Configured Chassis Mount Mechanical Drawing 13
VT20A-CY 20” Yokogawa Configured Chassis Mount Mechanical Drawing
VT20A-R 20” Rack Mount Mechanical Drawing 14
VT20A-RH 20” Honeywell Configured Rack Mount Mechanical Drawing 15
VT20A-M 20” Tabletop Drawing 16-17
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Page 13
Section
SPECIFICATIONS
SPECIFICATIONS
7
ENGINEERING SPECIFICATIONS
Size 20”
Resolution Capabilities 20A-C, 20A-CY, 20A-R, 20A-M
VGA to SVGA
20A-CH, 20A-RH
CGA/EGA to SVGA
Active Display Area 20A-C, 20A-CH, 20A-CY, 20A-R, 20A-RH
15.39” x 11.42” / 390.91mm x 290.07mm
20A-M
14.9” x 10.7” / 378.46mm x 271.78mm
Phosphor Medium Short P22
Deflection Angle 90º
Power Source 120 VAC 60Hz/220 VAC 50Hz (auto switching)
2.0A at AC 120V 60Hz | 1.0A at 220V 50Hz
Power Consumption 130 Watts
30 Watts Standby
15 Watts suspend Mode
Horizontal Frequency 15kHz to 50kHz
Vertical Frequency 45Hz to100Hz
Bandwidth 90MHz
Video Input Connector HD15(F) and 5BNC
DB9 (VT20A-CH and VT20A-RH)
Video Input Signal Analog 0.7 Vp-p
Sync Separate Horizontal and Vertical TTL Syncs Or
Composite TTL Syncs
Or Sync on Green 0.3V p-p
Temperature Operating: 0 to 50ºC
Storage: -20 t0 60ºC
Humidity Operating: 10 to 90% NC
Altitude 0 to 10,000 feet
Note: For continued compliance with Electromagnetic Compatibility limits, this monitor
must be used with the signal lead supplied.
20” Slow Scan User Guide 150-082
Storage: 10 to 90% NC
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Page 14
VARTECH SYSTEMS INC.
HEADQUARTERS
11529 Sun Belt Ct.
Baton Rouge, Louisiana 70809
Toll-Free: 800.223.8050
International Phone: 001.225.298.0300
Fax: 225.297.2440
E-mail: sales@vartechsystems.com
www.vartechsystems.com
20” Slow Scan User Guide 150-082
150-082-004
4.27.04
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