Tovis MTG-1972XN Manuale utente
TOVIS P/N MTG-1972XN DATE 03/11/02
REV NO. 0
TOVIS IGT P/N 69925100
PAGE 1/30
Color Monitor Service Manual
MODEL: MTG – 1972XN
(FOR IGT AUSTRALIA)
TOVIS CO., LTD.
TOVIS P/N MTG-1972XN DATE 2002.03.11
REV NO. 0
TOVIS Color Monitor Service Manual
PAGE 2/30
INDEX
1. SAFETY PRECAUTIONS ------------------------------- 3
2. SPECIFICATIONS ---------------------------------------- 4
3.TECHNICAL FEATURES ------------------------------- 5
4. TIMING CHART ------------------------------------------- 6
5. SET UP ------------------------------------------------------ 8
6.CONTROLS AND ADJUSTMENTS ------------------ 9
7.ADJUSTMENT SPECIFICATION -------------------- 18
8. DESCRIPTION OF CIRCUIT OPERATION ------- 21
9.TROUBLE SHOOTING --------------------------------- 25
TOVIS CO., LTD.
TOVIS P/N MTG-1972XN DATE 2002.03.11
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TOVIS Color Monitor Service Manual
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1. SAFETY PRECAUTIONS
WARNING: Service should not be attempted by anyone unfamiliar with the
necessary precautions on this unit. The following precautions are
necessary during servicing.
1-1. Some parts in this unit, such as a picture tube, have special safety-related
Characteristics for X-RAY RADIATION protect.
For continued safety, the parts replacement should be undertaken referring to
below article(1-2 ∼1-5).
1-2. Many electrical mechanical parts in this unit have special safety-related
characteristics for protection against shock hazard and others.
These characteristics are often passed unnoticed by a visual inspection and
the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage wattage, etc.
Replacement parts, which have these special characteristics, are identified in
the manual and supplements by shading on the schematic diagram and the
parts list. Before replacing these components read the parts list in this manual
carefully.
1-3. When replacing the chassis in the cabinet, always be certain that all the
protective devices are installed properly, such as insulating covers, strain relief,
etc.
1-4. Before replacing the back cover of the set, thoroughly inspect inside the
cabinet to see that no stray parts or tools have been left inside.
1-5 Before returning the set to the customer always perform an ac current leakage
check on the exposed metallic parts of the cabinet, such as terminal, screw
heads, metal overlays, control shafts, etc. To be sure the set is safe to operate
without danger of electrical shock, plug the AC line cord directly into a 115V AC
outlet (do not use a line isolation transformer during this check). Use an AC
volt- meter having 5000 ohms per volt or more sensitivity in the following
manner. Cannot use a 1500 ohm, 10watt resistor, paralleled by a 0.15(uF)
capacitor. Reverse the AC plug in the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Voltage measured must not
exceed 0.3V RMS. This corresponds to 0.2mA AC any value exceeding this
limit constitutes a potential shock hazard and must be corrected immediately.
TOVIS CO., LTD.
TOVIS P/N MTG-1972XN DATE 2002.03.11
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2. SPECIFICATIONS
2-1. Picture Tube
∙Size : 19"
∙Dot Pitch : 0.25mm
2-2. Signal Input
∙Video Input : Analog, Positive Signal(0.7Vp-p)
∙Horizontal Sync : TTL Level, Positive or Negative pulse.
∙Scanning : 28Khz ∼70KHz
∙Vertical Input : TTL Level, Positive or Negative pulse.
∙Scanning : 40∼160Hz
2-3. Power Supply
∙Power Input : AC100∼240V, 60/50Hz
∙Fuse Rating : 250V, 50T 3.15A
∙Power Consumption
Normal: less than 130W
DPMS: less than 20W
2-4. External Control:
Refer to page 7.
2-5. Operating Temperature: 0℃∼ 55℃
2-6. Operating Humidity: 10%∼90%(Non-condensing)
2-7. Net weight: 23kg
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3. TECHNICAL FEATURES.
3-1. U-com(MCU) control with OSD.
U-com recognizes the computer signal and the signal output from control
board connected with wire. So the circuit is simplified.
3-2. Universal AC input voltage.
Power supply operates on AC100∼240volt 60/50Hz for use all over the world.
3-3. Protection Circuit for over-current.
When over-current happens in the circuit, the protection circuit operates in
order to prevent the components from electrical shock or other risks.
3-4. Override function
Is designed for the normal display when the monitor is powered on without
connection from the source (No signal message).
3-5. Control panel
If you are not satisfied with the factory mode size, position, color settings, use
the control panel to program those you prefer in each resolution mode.
Then, these adjusted settings are kept in memory even if you change
resolution mode or turn off the monitor.
3-6. I2C BUS control
It is designed by I2C BUS control for simplifying the circuit. The number of
total components is less than 610 pcs.
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4. TIMING CHART
Factory Pre-Set Timing Modes.
D
VIDEO
C E
SYNC
B
A
DESCRIPTION MODE 1
VGA 720*400
MODE 2
VGA 640*480
MODE 3
8514/A 1024*768
MODE 4
S-VGA 680*400
FH 31.469KHz 31.469KHz 35.552KHz 37.500KHz
A 31.778㎲ 31.778㎲ 28.251㎲ 26.667㎲
B 3.813㎲ 3.813㎲ 3.920㎲ 2.032㎲
C 1.907㎲ 1.589㎲ 1.247㎲ 3.810㎲
D 25.422㎲ 25.422㎲ 22.806㎲ 20.317㎲
E 0.636㎲ 0.318㎲ 0.170㎲ 0.508㎲
H
POL. NEGATIVE NEGATIVE POSITIVE NEGATIVE
FH 70.087Hz 59.940Hz 86.960KHz 75.000Hz
A 14.268ms 16.683ms 11.500ms 13.333ms
B 0.064ms 0.064ms 0.113ms 0.080ms
C 1.112ms 0.794ms 0.563ms 0.427ms
D 12.711ms 15.253ms 10.810ms 12.800ms
E 0.381ms 0.064ms 0.014ms 0.027ms
V
POL. POSITIVE NEGATIVE POSITIVE NEGATIVE
VIDEO ANALOG ANALOG ANALOG ANALOG
TOVIS CO., LTD.
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DESCRIPTION MODE5 S-VGA
VESA 800*600
MODE6
VGA 800*600
MODE 7 VGA
VESA 800*600
MODE 8
VESA 1024*768
FH 37.879KHz 46.875KHz 48.077KHz 48.363KHz
A 26.400㎲ 21.333㎲ 20.800㎲ 20.677㎲
B 3.200㎲ 1.616㎲ 2.400㎲ 2.231㎲
C 2.200㎲ 3.232㎲ 1.280㎲ 1.615㎲
D 20.000㎲ 16.162㎲ 16.000㎲ 15.754㎲
E 1.000㎲ 0.323㎲ 1.119㎲ 0.998㎲
H
POL. POSITIVE POSITIVE POSITIVE NEGATIVE
FV 60.317Hz 75.000Hz 72.188Hz 60.004Hz
A 16.579ms 13.333ms 13.853ms 16.666ms
B 0.106ms 0.064ms 0.125ms 0.124ms
C 0.607ms 0.448ms 0.478ms 0.600ms
D 15.840ms 12.800ms 12.480ms 15.880ms
E 0.026ms 0.021ms 0.772ms 0.062ms
V
POL. POSITIVE POSITIVE POSITIVE NEGATIVE
VIDEO ANALOG ANALOG ANALOG ANALOG
TOVIS CO., LTD.
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DESCRIPTION
MODE 9
VESA
800*600
MODE 10
VESA
1024*768
MODE 11
VESA
1024*768
MODE 12
VESA
1280*1024
MODE 13
VESA
1024*768
FH 53.674KHz 56.476KHz 60.023KHz 63.981KHz 68.677KHz
A 18.631㎲ 17.707㎲ 16.660㎲ 15.698㎲ 14.561㎲
B 1.138㎲ 1.813㎲ 1.219㎲ 1.037㎲ 1.016㎲
C 2.702㎲ 1.920㎲ 2.235㎲ 2.296㎲ 2.201㎲
D 14.222㎲ 13.653㎲ 13.003㎲ 11.852㎲ 10.836㎲
E 0.569㎲ 0.321㎲ 0.203㎲ 0.360㎲ 0.508㎲
H
POL. POSITIVE NEGATIVE POSITIVE POSITIVE POSITIVE
FV 85.062Hz 70.069Hz 75.029Hz 60.020Hz 84.997Hz
A 11.756ms 14.272ms 13.328ms 16.638ms 11.765ms
B 0.056ms 0.106ms 0.050ms 0.047ms 0.044ms
C 0.503ms 0.513ms 0.466ms 0.594ms 0.524ms
D 11.179ms 13.599ms 12.795ms 16.005ms 11.183ms
E 0.019ms 0.054ms 0.017ms 0.016ms 0.015ms
V
POL. POSITIVE NEGATIVE POSITIVE POSITIVE POSITIVE
VIDEO ANALOG ANALOG ANALOG ANALOG ANALOG
5. SET UP
Setting up your monitor is easy. All you have to do is make a few simple
connections and adjustments. The procedure is as follows.
5-1. Start Up
Your monitor starts up automatically when you insert the power plug to power
source.
5-2. Signal cable Connection
Connect the 15pin-signal cable to the source. And Lock both screws to ensure that
the monitor is properly grounded.
TOVIS CO., LTD.
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19
1
AMP 19pin connector
NO. DESCRIPTION NO. DESCRIPTION
1 11 TOUCH_RxD
2 VIDEO RED 12 NET GND
3 VIDEO BLUE 13 AC GND
4 VIDEO GREEN 14 AC2
5 HOR-SYNC 15 AC1
6 VER-SYNC 16 A GND
7 VIDEO GND 17 +13V DC(A)
8 18 AC2
9 TOUCH_TxD 19 AC1
10
6. CONTROLS AND ADJUSTMENTS
There are four switches on the control panel.
Adjustable controls allow the best display status for individual preferences.
6-1. Key Function
①MODE
MODE - Call the Main-Menu OSD.
②SEL/DEGAUSS
SEL – Select the function (sub-Menu OSD) on the Main- Menu OSD.
DEGAUSS – Do degaussing in state that the OSD isn’t displayed.
③DOWN/UP
-When the Main-Menu is displayed, can search each function using these
Keys.
-When the Sub-Menu is displayed (after select the function), can change
each state of the screen using these keys.
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O.S.D Control Sub-P.C.B
6.2. O.S.D CONTROL METHOD
1) Control items.
Location Adjustment Method Function
SUB PCB OSD Control
Brightness
Contrast
Horizontal Position
Horizontal-Size
Vertical Position
Vertical-Size
Side Pincushion
Trapezoid
Pin Balance
Parallelogram
MAIN PCB
VR control, VR501
VR301
FBT
Sub-Bright
H.V Adjustment
Focus and Screen
6-3. OSD Controls
- User’s control.
A. BRIGHTNESS ADJUSTMENT.
1) Press the “MODE” key then Main-Menu OSD come out as below
Figure.
2) Search “BRIGHTNESS” sub-menu using “UP/DOWN” key on the
Main-Menu OSD.
3) Select the “BRIGHTNESS” by pressing “SEL” key. Then The
“BRIGHTNESS” OSD color changes from yellow to red.
TOVIS CO., LTD.
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