Wells Gardner Computer Monitor D9300 Series User Manual

Wells-Gardner Electronics Corporation  
Service Manual for  
D9300 Series  
Digital-Control Color Monitor  
Wells-Gardner Electronics  
5500W. 55th Street Suite A  
Mc,Cook Illinois 60525-3605  
(708) 290-2100  
069X3045-100  
ECN: E01024  
Date: 8-18-00  
Printed on 03/20/03  
 
Wells-Gardner Electronics Corporation  
SAFETY PRECAUTION:  
1.  
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  
1-2  
Some parts, such as a picture tube in this unit, have special safety-related characteristics  
for X-RAY RADIATION protection.  
For continued safety, the parts replacement should be undertaken referring to below  
article (1-2 and 1-5).  
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 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  
any of these components, read the parts list in this manual carefully.  
1-3  
1-4  
1-5  
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.  
Before replacing the back cover of the set, thoroughly inspect the inside of the cabinet to  
see that no stray parts or tools have been left inside.  
Before returning the set to the customer, always perform an AC leakage current check on  
the exposed metallic parts of the cabinet, such as terminal, screwheads, metal overlays,  
control shafts, etc. To insure the set is safe to operate without danger of electrical shock,  
plug the AC line cord directly into a 120V AC outlet (do not use a line isolation  
transformer during this check). Use an AC voltmeter having 5000 ohms per volt or more  
sensitivity in the following manner. Connect a 1500 ohm, 10 watt resistor, parallel with a  
(0.15uF) capacitor. Reverse the AC plug in the AC outlet and repeat the 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.  
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2.  
SPECIFICATION:  
2-1 Picture Tube.  
xꢀ Size: 18V  
xꢀ Dot Pitch: .25mm  
2-2 Signal Input.  
xꢀ Video Input: Analog, Positive Signal (0.7V p-p)  
xꢀ Horizontal Sync: TTL Level, Positive or Negative Pulse  
xꢀ Scanning : 28 KHz-70KHz  
xꢀ Vertical Input: TTL Level, Positive or Negative pulse  
xꢀ Scanning : 40-160Hz  
2-3 Power Supply.  
xꢀ Power Input : 120-240 VAC, 50/60Hz  
xꢀ Fuse Rating: 250V, 3.15A  
xꢀ Power Consumption  
Normal : less than 130W  
2-4 OSD (On Screen Display) Control:  
Refer to page 7  
2-5 Operating Temperature: 0qC - 55qC  
2-6 Operating Humidity: 10% - 90% (Noncondensing)  
2-7 Net Weight : 17kg (37lbs)  
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3.  
TECHNICAL FEATURES:  
3-1  
Microprocessor control with OSD (On screen display menu).  
Microprocessor recognizes the input computer signal and signal output from the customer  
control board connected to the main board by a flat cable.  
3-2  
Universal AC Input Voltage.  
Power supply operates on 120-240 VAC at 60/50Hz for use all over the world.  
3-3. Protection Circuit for over-current.  
When an over-current condition occurs in the circuit, the protection circuit operates in  
order to prevent the components from electrical shock or other risks.  
3-4  
3-5  
Override function.  
A (NO SIGNAL MESSAGE) is displayed on the screen if no signal is present at the signal  
input cable while the monitor is powered on.  
Control panel.  
If you require different display characteristics other than the factory mode presets of size,  
position, color settings, use the control panel to program it to your requirements in each  
resolution mode. These adjusted settings are kept in memory even if you change resolution  
mode or turn off the monitor.  
3-6  
I²C BUS control.  
The monitor is designed with I²C BUS control for simplifying the circuitry.  
The number of total components is less than 610 pcs.  
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4.  
TIMING CHART:  
Factory Pre-Set Timing Modes.  
Horizontal and Vertical Timing Diagram for Table 1  
.
TABLE 1 :  
QUANTUM 801GX  
MVP-NSW  
US500  
MK6  
VGA_M4  
FORMAT  
MODE 1  
640*400  
29.63Hz  
33.75µs  
1.76µs  
MODE 2  
640*400  
31.5KHz  
31.778µs  
3.88µs  
MODE 3  
640*480  
31.35KHz  
28.251µs  
3.86µs  
MODE 4  
8514/A 1024*768  
35.552KHz  
28.251µs  
3.920µs  
DESCRIPTION  
FH  
A
B
H
C
D
1.84µs  
1.247µs  
3.52µs  
26.67µs  
1.86µs  
2.04µs  
25.5µs  
25.4µs  
22.806µs  
0.170µs  
E
0.63µs  
0.58µs  
POL.  
FV  
A
POSITIVE  
62.91Hz  
15.88ms  
0.0338ms  
1.680ms  
13.56ms  
0.675ms  
POSITIVE  
ANALOG  
POSITIVE  
70.1Hz  
POSITIVE  
59.8Hz  
POSITIVE  
86.960Hz  
11.500ms  
0.113ms  
14.2ms  
16.72ms  
0.066ms  
1.052ms  
15.36ms  
0.316ms  
POSITIVE  
ANALOG  
B
0.0636ms  
1.110ms  
12.7ms  
V
C
0.563ms  
D
10.810ms  
0.014ms  
E
0.408ms  
POSITIVE  
ANALOG  
POL.  
VIDEO  
POSITIVE  
ANALOG  
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QUANTUM 801GX  
FORMAT  
VG900602  
DMT8075  
VS900603  
VG901101  
MODE 8  
VG901101  
MODE 9  
MODE 5, S-VGA  
VESA 680*480  
37.500KHz  
26.667us  
MODE 6  
VGA 800*600  
37.879KHz  
26.400µs  
3.200µs  
MODE 7 VGA  
VESA 800*600  
46.875KHz  
21.333µs  
1.616µs  
DESCRIPTION  
VESA 800*600 VESA 1024*768  
FH  
A
B
48.077KHz  
20.800µs  
2.400µs  
48.363KHz  
20.677µs  
2.231µs  
2.032us  
H
V
C
D
E
POL.  
FV  
A
B
C
D
E
3.810us  
20.317us  
0.508us  
NEGETIVE  
75.00Hz  
13.333ms  
0.080ms  
.427ms  
12.800ms  
0.027ms  
2.200µs  
20.000µs  
1.000µs  
POSITIVE  
60.317Hz  
16.579ms  
0.106ms  
0.607ms  
15.840ms  
0.026ms  
POSITIVE  
ANALOG  
3.232µs  
16.162µs  
0.323µs  
POSITIVE  
75.000Hz  
13.333ms  
0.064ms  
0.448ms  
12.800ms  
0.021ms  
POSITIVE  
ANALOG  
1.280µs  
16.000µs  
1.119µs  
1.615µs  
15.754µs  
0.998µs  
POSIIVE  
72.188Hz  
13.853ms  
0.125ms  
0.478ms  
12.480ms  
0.722ms  
POSITIVE  
ANALOG  
NEGATIVE  
60.004Hz  
16.666ms  
0.124ms  
0.600ms  
15.880ms  
0.062ms  
NEGATIVE  
ANALOG  
POL.  
VIDEO  
NEGETIVE  
ANALOG  
QUANTUM 801GX  
FORMAT  
DMT8085  
MODE 10  
VS910801  
MODE 11  
DMT1075  
MODE 12  
DMT1260  
MODE 13  
DMT1085  
MODE 14  
DESCRIPTION  
VESA 800*600 VESA 1024*768 VESA 1024*768 VESA 1280*1024 VESA 1024*768  
FH  
A
B
53.674KHz  
18.631µs  
1.138µs  
56.476KHz  
17.707µs  
1.813µs  
60.023KHz  
16.660µs  
1.219µs  
63.981KHz  
15.698µs  
1.037µs  
68.677KHz  
14.561µs  
1.016µs  
H
V
C
D
E
POL.  
FV  
A
B
C
D
E
2.702µs  
14.222µs  
0.569µs  
1.920µs  
13.653µs  
0.321µs  
2.235µs  
13.003µs  
0.203µs  
2.296µs  
11.852µs  
0.360µs  
2.201µs  
10.836µs  
0.508µs  
POSITIVE  
85.062Hz  
11.756ms  
0.056ms  
0.503ms  
11.179ms  
0.019ms  
POSITIVE  
ANALOG  
NEGATIVE  
70.069Hz  
14.272ms  
0.106ms  
0.513ms  
13.599ms  
0.054ms  
NEGATIVE  
ANALOG  
POSITIVE  
75.029Hz  
13.328ms  
0.050ms  
0.466ms  
12.795ms  
0.017ms  
POSITIVE  
ANALOG  
POSITIVE  
60.020Hz  
16.638ms  
0.047ms  
0.594ms  
16.005ms  
0.016ms  
POSITIVE  
ANALOG  
POSITIVE  
84.997Hz  
11.765ms  
0.044ms  
0.524ms  
11.183ms  
0.015ms  
POSITIVE  
ANALOG  
POL.  
VIDEO  
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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. Single Cable Connection.  
Connect the 15pin signal cable to the source and lock both screws to ensure that the  
monitor is properly grounded.  
D type 15pin connector:  
PIN NO.  
DESCRIPTION  
VIDEO RED  
VIDEO GREEN  
VIDEO BLUE  
PIN NO.  
DESCRIPTION  
N.C.  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
GROUND  
N.C.  
N.C.  
N.C.  
SDA  
HOR-SYNC  
VER-SYNC  
SCL  
VIDEO RED GROUND  
VIDEO GREEN GROUND  
VIDEO BLUE GROUND  
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6.  
CONTROLS AND ADJUSTMENTS:  
There are four switches on the control panel. Adjustable controls allow the best display  
status for individual requirements.  
6-1. Key Function.  
1. MODE/EXIT  
MODE – Call the Main-Menu OSD  
2. SEL / Degauss  
SEL – Call the Sub-Menu OSD  
Degauss – Degausses the CRT (active when the OSD is not displayed)  
3. DOWN/UP  
When the Main-Menu is displayed, you can select each function using these keys.  
When the Sub-Menu is displayed, you can change the amplitude of  
the selected function of the screen using these keys.  
6-2. O.S.D. CONTROL METHOD.  
User Adjustment.  
Location  
Adjustment Method  
Function  
Brightness  
Contrast  
Horizontal Position  
Horizontal Size  
Vertical Position  
Vertical Size  
Side Pincushion  
Trapezoid  
CUSTOMER  
CONTROL  
PCB  
OSD CONTROL  
Pin Balance  
Parallelogram  
VR control, VR501  
VR301  
Sub-Bright  
MAIN PCB  
H.V. Adjustment*  
Focus and Screen  
Tilt  
FBT  
VR302  
*NOTE: (FACTORY ADJUSTED AND EPOXYED VR301)  
(HOT MELTED SCREEN FBT)  
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6-3. OSD Controls  
- User’s control.  
A. BRIGHTNESS ADJUSTMENT.  
1) Press the “MODE” key then Main-Menu OSD comes out as figure on next page.  
2) Search “BRIGHTNESS” sub-menu using “UP/DOWN” key on the Main-Menu OSD.  
3) Select the “BRIGHTNESS” by pressing “SEL” key. The “BRIGHTNESS” OSD color  
changes from yellow to red.  
4) Adjust Brightness as much as you want using “UP/DOWN” key.  
5) After finishing the Brightness adjust, press the “MODE” key. The “BRIGHTNESS” OSD  
color changes from red to yellow and the changed Brightness value saves automatically.  
6) If you want to adjust other functions (sub-menu), search the function using “UP/DOWN”  
keys, and then repeat the same procedures of steps 3-5.  
7) Press the “MODE” key again to finish adjustments and the OSD will disappear.  
If no action is taken in the OSD, the menu will disappear by itself.  
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A. BRIGHTNESS ADJUSTMENT  
B.  
C.  
D.  
E.  
F.  
G.  
H.  
I.  
CONTRAST  
H. POSITION  
H. SIZE  
V. POSITION  
V. SIZE  
PINCUSHION  
TRAPEZOID  
PARRALLELOG ADJUST  
PIN BALANCE ADJUST  
ADJUST  
ADJUST  
ADJUST  
ADJUST  
ADJUST  
ADJUST  
ADJUST  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
SAME ABOVE  
J.  
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6-3 OSD Controls (continued):  
K. COLOR ADJUSTMENT  
1) Press the “MODE” to show the Main-Menu OSD as shown by the left-below figure.  
2) Search the “COLOR” sub-menu using “UP/DOWN” key on the Main-Menu OSD.  
3) SELECT the “COLOR” by pressing “SEL” key. The color Sub-Menu OSD appears as  
shown by the right-below figure.  
4) Search “USER” using “UP/DOWN” key. (“COLOR1” and “COLOR2” are adjusted in  
factory by auto-alignment machine.)  
5) Press “SELECT” key to adjust “RED”, “GREEN” and “BLUE”. Each is selected by  
pressing the “SELECT” key. The selected item changes OSD color from white to shown  
it’s own color as the character. (ex. “RED” goes red in color).  
6) Adjust “RED”, “GREEN” or “BLUE” using “UP/DOWN” key.  
7) Press “MODE” key to finish the color adjustment. The OSD will then go back to the  
Main-Menu.  
8) Press the “MODE” key again to finish adjustments and make the OSD disappear.  
COLOR ADJUST  
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L.  
RECALL.  
When the “RECALL” key is pressed, all user’s adjustment values are changed to the factory  
values.  
M.  
LANGUAGE.  
The menu is available in four languages.  
1. Press the “MODE” key and the Main-Menu OSD will appear as in the previous figure.  
2. Search the “LANGUAGE” sub-menu using the “UP/DOWN” key on the Main-Menu OSD.  
3. Select the “LANGUAGE” by pressing the “SEL” key. Then the Language sub-menu will  
appear as in the following figure  
4. Search any language using the “UP/DOWN” key.  
5. Select a language by pressing the “SEL” key.  
6. Press “MODE” key to finish and save the selected language.  
Then the OSD will return to Main-Menu in the selected language.  
Press the “MODE” key again to finish the adjustment then the OSD will disappear.  
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7.  
ADJUSTMENT SPECIFICATION:  
7-1. Adjustment Sequence:  
The monitor requires a min. of 15 minutes warm up time before adjustment.  
7-2. Adjustment Sequence:  
FBT B+ Voltage G2 Voltage Hor. Center Hor. Size Hor. Position Ver. Size  
Ver. Position Side-pin Trapezoid Focus White Balance Convergence (if  
needed).  
7-3. Adjustment Procedure - How to enter the Factory Mode:  
Press Menu and Down simultaneously and hold down for three seconds. Adjust  
BRIGHTNESS and CONTRAST to “50” amplitude. Factory mode is active when the  
bottom line of the menu is red. Blue indicates user mode.  
7-3.1 FBT B+ voltage adjustment. (Flyback Replacement Only – Pot is Glued)  
1.  
2.  
Input the crosshatch pattern with the 48KHz 1024x768 mode.  
After connecting a digital voltmeter to D316, cathode and the frame ground, adjust  
FBT B+ voltage to 110V +/- 0.5V using VR301.  
7-3.2 G2 and G1 Voltage adjustment.  
1.  
2.  
3.  
Input the crosshatch pattern with 48 kHz 1024x768 mode  
Adjust the G2 for visible background.  
Adjust G1, VR501, for –35 +/- 1vdc  
7-3.3 Geometry/Display Adjustment.  
Refer to controls and adjustment (Article 6)  
7-3.4 Focus Adjustment  
1.  
2.  
Input the “H” character pattern with 48 kHz 1024x768  
Adjust the focus for the best balance at each point of A,B,C,D,E as shown below by  
rotation the focus VR of FBT  
3.  
For Dual Focus 17” monitors, adjust FOCUS 1 and FOCUS 2 for sharpest  
horizontal and vertical lines on a crosshatch pattern in oval area from point B to  
point C of display. Check overall focus in center and corners.  
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7-3.5 Purity and Convergence Adjustment. (If Required)  
A. Purity Adjustment.  
1. Demagnetize the picture tube and cabinet using a degaussing coil.  
2. Turn the CONTRAST and BRIGHTNESS controls to maximum.  
3. In User Color Menu, adjust RED and BLUE controls to provide only a green raster  
4. Loosen the clamp screw holding the yoke and slide the yoke  
backward to provide vertical green belt (zone) in the picture screen.  
5. Remote the Rubber wedges  
.
6. Rotate and spread the tabs of the purity magnet around the neck of the picture tube  
until the green belt is in the center of the screen. At the same time, center the raster  
vertically.  
7. Move the yoke slowly forward until a uniform green screen is obtained. Tighten the  
clamp screw of the yoke temporarily.  
8. Check the purity of the red and blue raster by adjusting COLOR controls.  
9. Obtain a white raster referring to “CRT GRAY SCALE ADJUSTMENT”  
10. Proceed with convergence adjustment.  
B. Convergence adjustment:  
1. Change to a crosshatch pattern with a color signal generator.  
2. Adjust the BRIGHTNESS and CONTRAST controls for well defined pattern  
3. Adjust two tabs of the 4-pole magnets to change the angle between them and  
.
superimpose red and blue vertical lines in the center of the picture screen  
.
4. Turn both tabs at the same time keeping their angles constant to superimpose red  
and blue horizontal lines at the center of the screen.  
5. Adjust two tabs of 6-pole magnets to superimpose red/blue line with green one.  
Adjusting the angle affects the vertical lines and rotating both magnets affects the  
horizontal line.  
6. Repeat adjustments 3,4 and 5, keeping in mind red, green and blue movement,  
because 4-pole magnets and 6-pole magnets interact and make dot movement  
complex.  
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7-3.6 White Balance adjustment (video).  
1. Warm up the unit for 15 minutes  
2. Input the window pattern with 31KHz 640*480 mode.  
3. Adjust the color temperature to be X=0.285+/-0.015 and Y=0.293+/-0.015 by  
R.G.B. gain on User Color Menu or User Preference.  
7-4  
OSD FACTORY CONTROL  
This should be adjusted by a technician or qualified repair personnel.  
This monitor has two-adjustment modes.  
One is for the user’s own adjustment and other is for factory adjustment.  
But sometimes adjustments in the factory adjustment modes are needed for repair.  
Caution: More precautions must be made in the factory adjustment mode compared to the  
user mode, because after finishing adjustments in the factory mode, if wrong values have been  
entered, you can not revert back to the old settings. At the user mode, if there are mistakes,  
you can use the “RECALL” function (refer to 6-3 M item) to go back to the previous settings.  
In factory mode, the “RECALL” function will only display your current settings.  
A. Factory mode entering.  
Press the “MODE” and “DOWN” key simultaneously until the OSD comes out as below.  
The OSD of factory mode is the same format with user mode except for the color of the  
bottom line. (User mode is blue; factory mode is red).  
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B. Exit and save. (Save is automatic)  
1. After finishing adjustments, select “RECALL” using “UP/DOWN” key.  
2. Press “SEL” key until OSD disappears. The adjusted value is saved and exits from the  
factory mode.  
C. Adjustment.  
All adjustment methods are same as user’s control mode except “COLOR”  
7-5  
White balance Adjustment:  
A. Pre-adjustment.  
1.  
2.  
3.  
Warm up monitor for 15 minutes.  
Input the small window pattern with 31KHz 640*480 mode.  
Degauss the screen with External degaussing coil.  
White Balance adjustment (background raster).  
1.  
2.  
Remove the video signal.  
Adjust the sub-brightness of background raster to be 1.0FtL +/- 0.3FtL with SUB  
BRIGHTNESS control VR501.  
B. COLOR ADJUSTMENT.  
COLOR 1 - 8500°K: X=0.285, Y=0.294  
COLOR 2 - 6500°K: X=0.312, Y=0.329  
Check at 2.5fL (BIAS), 50fL (GAIN) light output levels.  
Reference size, Horizontal = 361mm +/- 4 mm from CRT phosphor edges.  
Vertical = 270mm +/- 4mm from CRT phosphor edges.  
1. It is best to use a centered small white box pattern. Before adjusting the “COLOR”.  
“CONTRAST” should be set at the maximum and “BRIGHTNESS” should be set to  
“50”.  
2. In the factory mode, toggle down to “COLOR” using “UP/DOWN” key.  
3. Select “COLOR” by pressing “SEL” key. Color sub-menu appears as left below figure.  
4. Search a color temperature you want to adjust (gain or bias) using “UP/DOWN”  
(“GAIN” is the high-beam area’s adjustment and “BIAS”, the low-beam.)  
5. Select any item desired by pressing “SEL” key then the OSD changes to the sub-menu  
as shown in figure below-right.  
6. Adjust color temperature using “SEL” and “UP/DOWN” key.  
(“SEL” key: moves item position, “UP/DOWN” key: changes value.)  
7. In the “GAIN” mode, “CO” means sub-contrast adjustment. Sub-contrast is adjusted  
using “UP/DOWN” key.  
8. Press the “MODE” key to finish the “GAIN” or “BIAS” adjustment.  
9. If you want to adjust other “GAIN” or “BIAS”, repeat from steps 4-8.  
10. Press “MODE” key again to finish the “COLOR” adjustment.  
11. When done with the factory adjustment, select “RECALL” as in step B.“Exit and  
save”.  
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7-5  
B. Color Adjustment  
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8.DESCRIPTION OF CIRCUIT OPERATION:  
8-1. Mode Control.  
8-1.1 H-Sync is inputted to pin 30 of IC601, V-Sync to pin 29 of IC601 for each mode and pin  
27, 26  
of IC601 output always positive polarity sync.  
8-1.2 The outputs from IC601 are as below (See table below)  
Frequency  
Range of Frequency  
OUTPUT (MCU PIN)  
(CS3) (CS2) (CS1) OFF ST-BY SUS-P LED  
No.  
Resolution  
Hf  
Vf  
Hf (KHz)  
Vf (Hz)  
38  
39  
40  
5
3
4
6
KHz Hz  
1
2
31  
31  
35  
38  
38  
47  
48  
48  
53  
56  
60  
64  
69  
70  
60  
86  
75  
60  
75  
72  
60  
85  
70  
75  
60  
85  
720x400  
640X480  
1024X768  
640X480  
800X600  
800X600  
800X600  
1024X768  
800X600  
1024X768  
1024X768  
1280x1024  
1024x768  
28 ~32.9  
68 ~ 72  
58 ~ 62  
84 ~ 88  
73 ~ 77  
58 ~ 62  
73 ~ 77  
70 ~ 74  
58 ~ 62  
83 ~ 87  
68 ~ 72  
73 ~ 77  
58 ~ 62  
83 ~ 87  
L
L
L
L
H
L
L
"
L
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
3
33 ~ 35.9  
36 ~ 40.9  
36 ~ 40.9  
41~ 51.9  
"
4
H
H
L
L
5
L
6
H
H
H
H
H
H
H
H
7
L
8
"
L
9
52 ~ 61.9  
"
H
H
H
H
H
10  
11  
12  
13  
L
"
L
62 ~ 70  
62 ~ 70  
H
H
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8-2  
Deflection Processor (IC301):  
8-2.1  
8-2.1.2  
Horizontal section.  
Horizontal Oscillation.  
Horizontal free frequency is set to 48KHz by R314 and C347. Auto-sync processing  
can be done from 28KHz to 70KHz by means of IC301 without any adjustment.  
8-2.1.3  
8-2.1.4  
Phase Shift.  
Horizontal phase shift is controlled by IC601 using I²C BUS control.  
Horizontal driver output.  
The output pulse having the duty-cycle of 47% is available at pin 26 of IC301  
The output is used by the horizontal drive circuit.  
8-2.1.5  
8-2.1.6  
B+ control driver output.  
The output pulse is available at pin 6 of IC301 and it is used for the horizontal scan  
voltage control driver.  
X-Ray protection.  
When the flyback voltage rises up to an unacceptable level, X-ray protection is  
activated. When the X-ray input pin 25 of IC301 is above 8V, the internal latch in  
IC301 is turned on. This stops all line drive output to the horizontal circuits. To  
reset the protection circuit, remove main power to the monitor for 5 seconds.  
8-2.2  
Vertical section:  
8-2.2.1  
Vertical oscillation.  
The free running frequency of the vertical oscillator is determined by the capacitor  
C342 at pin VCAP (pin22) of IC301.  
8-2.2.2  
8-2.2.3  
Vertical amplitude.  
Vertical amplitude is controlled by IC601 using I²C bus control.  
Vertical position.  
Vertical position is controlled by IC601 using I²C bus control.  
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8-2.2.4  
8-2.3  
East-west parabola.  
A parabola wave-form is available on pin 24 of IC301 for driving the pincushion  
correction stage. Amplitude of parabola waveform is controlled by IC601 using I²C.  
B+ Regulator.  
B+ PWM regulator output is available on pin 28 of IC301 for driving the B+ control  
stage. This PWM output is adjusted through VR301.  
8.3  
Vertical Deflection (IC201):  
IC201 (KA2142) is used for direct driving of the vertical deflection yoke.  
Horizontal scan voltage control stage:  
8-4  
The set-up converter is used in this stage. The output pulse at pin 28 of the IC301 is  
synchronized on horizontal frequency. This pulse is operated via buffer stage  
Q311/Q312. This output is rectified through D315/L304.  
In this way, the supply voltage to the flyback transformer can be proportional to the  
horizontal line frequency.  
8-5  
Horizontal deflection output stage:  
8-5.1  
Line driver stage.  
As a driver device, small MOSFET Q307(IRF630A) is used.  
The driver transformer T302 is equipped with a snubber circuit (R327/C309) at the  
primary side to damp excessive ringing.  
8-5.2  
Horizontal power output stage.  
The horizontal power output stage is a conventional one with a diode modulator.  
As a deflection transistor, the Q308 (KSC3997) is used.  
To compensate for horizontal linearity, T301 is connected in series with the  
horizontal DY. It is controlled by DC voltage of Q304 collector, which the base  
voltage of Q304 is integrated from output at pin 40 of IC601.  
8-5.3  
S-Correction capacitor switches.  
Q316 is off when horizontal frequency is 35KHz  
Q316, Q317 are off when horizontal frequency is 37KHz  
Q316, Q318 are off when horizontal frequency is 43KHz-52KHz  
19  
 
Wells-Gardner Electronics Corporation  
Q317, Q318 are off when horizontal frequency is 53KHz a 61KHz  
Q316, Q317, Q318 is off when horizontal frequency is 62KHz a70KHz  
8-6  
8-7  
8-8  
FBT (Flyback Transformer):  
The high voltage for CRT anode focus, G2 voltage for CRT and – 12V for vertical  
deflection are generated by the FBT. Also, -130V for G1 voltage, horizontal flyback  
pulse, +128V video supply, and for dual focus units 800V dynamic focus supply.  
ABL (Automatic Beam Limiting):  
The voltage of point 7 depends on the anode current of FBT. So, the voltage at pin 7  
of the FBT decreases with increasing anode current. That time, using at this level,  
increase contrast setting level limited a certain level (32FtL in white pattern) that is  
set by inner voltage of IC401.  
Video amplification section:  
8-8.1  
Video pre-amplifier(IC401).  
Input video signals are amplified by means of IC401, and the amplified signals drive  
the video output stage (IC402). Video gain is adjusted by DC voltage at pin 12 for  
ABL control.  
8-8.2  
Video output stage (IC402).  
The video output signals from IC401 are amplified again by IC402, and IC402  
applies video signals to each cathode of the CRT. Cutoff voltages are adjusted by  
Q405, Q406 and Q407 which is operated by I²C BUS control through the  
microprocessor.  
8-8.3  
OSD (On Screen Display : IC403).  
The OSD signal is applied from IC403 to IC402. It is controlled by I²C BUS control  
line.  
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Wells-Gardner Electronics Corporation  
9.  
TROUBLESHOOTING:  
9-1. NO POWER.  
21  
 
Wells-Gardner Electronics Corporation  
9-2. NO VIDEO.  
22  
 
Wells-Gardner Electronics Corporation  
9-3. NO RASTER:  
23  
 
Wells-Gardner Electronics Corporation  
9-4  
TROUBLE IN HORIZONTAL SIZE:  
24  
 
Wells-Gardner Electronics Corporation  
9-5. TROUBLE IN CONTRAST:  
25  
 
Wells-Gardner Electronics Corporation  
9-6. TROUBLE IN BRIGHTNESS:  
26  
 

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