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TOVIS P/N 

MTG-1902EX 

DATE 

2002.03.11 

R

 

EV.NO

0 

TOVIS 

 

PAGE 

18/25 

 
4) Ease-west parabola 
        A parabola waveform is available on pin 24 of IC301 for driving the pincushion 
correction stage. Amplitude of parabola waveform is controlled by IC601 using I

2

C. 

 
8-2.3. B+ Regulator 
          B+ PWM regulator output is available on pin 28 of IC301 for driving the 

B+ control stage.   

 
8-3. Vertical Deflection (IC201) 
    IC201 (KA2142) is used for direct driving of vertical deflection yoke. 
 
8-4. Horizontal scan voltage control stage 
        The step-up converter is used in this stage. 
    The output pulse at pin 28 of the IC301 is synchronized on horizontal 

frequency. And this pulse is operated via buffer stage Q353, Q354 

        This output is rectified through D308, C328. 
         
8-5. Horizontal deflection output stage 
    8-5.1. Line driver stage 
         As a driver device, small TR Q305(C3502E) 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 used boost-up circuit. 
         As a deflection transistor, the Q308 (J6820) is used. 
         To compensate the horizontal linearity, theT301 is connected in a series         

with the horizontal DY. It is controlled by DC collector voltage of Q304, 
which the base voltage of Q304 is integrated from output at pin 24 of   

         IC601. 
 
. 
                   
 
 
 

TOVIS CO., LTD. 

 

Содержание MTG-1902EX

Страница 1: ...TOVIS P N MTG 1902EX DATE 03 11 02 REV NO 0 TOVIS IGT P N 69925601 PAGE 1 25 Color Monitor Service Manual MODEL MTG 1902EX TOVIS CO LTD...

Страница 2: ...or Service Manual PAGE 2 25 I N D E X 1 SAFETY PRECAUTIONS 3 2 SPECIFICATIONS 4 3 TECHNICAL FEATURES 5 4 TIMING CHART 6 5 SET UP 7 6 CONTROLS AND ADJUSTMENTS 8 7 ADJUSTMENT SPECIFICATIONS 13 8 DESCRIP...

Страница 3: ...ist Before replacing these components read the parts list carefully 1 3 When replacing chassis in the cabinet always be certain that all the protective devices are installed properly such as insulatin...

Страница 4: ...ntal Sync TTL Level Positive or Negative pulse Scanning 28KHz 33KHz Vertical Input TTL Level Positive or Negative pulse Scanning 40 150Hz 2 3 Power Supply Power Input AC100 240V 50 60Hz Fuse Rating 25...

Страница 5: ...cuit the protection circuit operates in order to prevent the components from electrical shock or other risks 3 4 Override function The override function is designed for the normal display when the mon...

Страница 6: ...NC A B DESCRIPTION MODE 1 VGA 720 400 MODE 2 VGA 640 480 FH 31 469KHz 31 469KHz A 31 778 31 778 B 3 813 3 813 C 1 907 1 589 D 25 422 25 422 E 0 636 0 318 H POL NEGATIVE NEGATIVE FH 70 087Hz 59 940Hz A...

Страница 7: ...r Monitor Service Manual PAGE 7 25 5 SET UP 5 1 Start Up Your monitor starts up automatically when you insert the power plug into the power source 5 2 25p AMP cable Connection AMP 25PIN MICROTOUCH MIC...

Страница 8: ...preferences 6 1 Key Function MODE MODE Call the Main Menu OSD SEL DEGAUSS SEL Select the function sub Menu OSD on the Main Menu OSD DEGAUSS perform degaussing if the OSD is not displayed DOWN UP When...

Страница 9: ...MAIN PCB VR control VR301 VR501 VR502 VR503 FBT H MIN SIZE H V Adjustment ABL Adjustment Sub Bright Focus and Screen 6 3 OSD Controls User s control A BRIGHTNESS ADJUSTMENT 1 Press the MODE key then...

Страница 10: ...nt by using the UP DOWN keys 7 After finishing the Brightness adjustment press the MODE key then The BRIGHTNESS OSD color should change from red to yellow and be saved automatically 6 If you want to a...

Страница 11: ...VE D H SIZE ADJUST SAME WAY AS ABOVE E V POSITION ADJUST SAME WAY AS ABOVE F V SIZE ADJUST SAME WAY AS ABOVE G PINCUSHION ADJUST SAME WAY AS ABOVE H TRAPEZOID ADJUST SAME WAY AS ABOVE I PARALLELOG ADJ...

Страница 12: ...ge from white to its own color e g RED goes to red color 3 Adjust the RED GREEN or BLUE using the UP DOWN key 4 Press the MODE key to finish the color adjustment The OSD should return to the Main Menu...

Страница 13: ...H V voltage adjustment 1 Input the cross hatch pattern with the 31KHz 640 480 mode 2 After connecting a HIGH voltage meter to the ANODE adjust VR 501 to 27kv 7 3 2 G2 Voltage adjustment 1 Input the cr...

Страница 14: ...40 480mode 2 Adjust the color temperature to be X 0 281 0 015 and Y 0 311 0 02 by R B gain on OSD menu 3 Adjust CONTRAST to be 67FL 5 F L 7 3 6 Purity and Convergence Adjustment 1 Purity Adjustment De...

Страница 15: ...of the 4 Pole Magnets to change the angle between them and superimpose the red and blue vertical lines in the center area of the picture screen Turn both tabs at the same time keeping their angles co...

Страница 16: ...31 of IC601 V Sync to pin 30 of IC601 for each mode and pin 28 29 of IC601 output will always have positive polarity sync 8 1 2 The outputs from IC601 are as below See Table 1 Frequency Range of Frequ...

Страница 17: ...B control driver output The output pulse is available at pin 28 of IC301 and it is used for H scan voltage control driver 5 X ray protection When the fly back voltage rises up to an unacceptable leve...

Страница 18: ...8 of the IC301 is synchronized on horizontal frequency And this pulse is operated via buffer stage Q353 Q354 This output is rectified through D308 C328 8 5 Horizontal deflection output stage 8 5 1 Lin...

Страница 19: ...ased the anode current is increased accordingly When the anode current is increased contrast is set at the certain limited level 28FL in white pattern that is set by inner voltage of IC401 8 8 Video a...

Страница 20: ...ROUBLE SHOOTING 9 1 NO POWER NO POWER CHECK C112 AC LEVEL NO CHECK REPLACE F101 POWER CORD YES CHECK C114 DC LEVEL NO CHECK REPLACE BD101 YES CHECK IC105 7 WAVEFORM NO CHECK REPLACE IC105 YES CHECK IC...

Страница 21: ...9 2 NO VIDEO NO VIDEO CHECK SIGNAL CABLE CHECK IC401 21 24 26 PULSE CHECK IC401 23 DC LEVEL 18 19 PULSE CHECK REPLACE IC601 Q204 NO YES CHECK REPLACE SIGNAL CABLE NO NO YES YES CHECK REPLACE IC401 CH...

Страница 22: ...nitor Service Manual PAGE 22 25 9 3 NO RASTER NO RASTER YES CHECK REPLACE Q313 Q311 D312 CHECK HV G2 CHECK Q319 WAVEFORM CHECK G1 DC 80V CHECK Q319 BASE CHECK REPLACE FBT CRT NO NO YES CHECK REPLACE Q...

Страница 23: ...Color Monitor Service Manual PAGE 23 25 9 4 TROUBLE IN HORIZONTAL SIZE YES CHECK 45V CHECK Q352 DRAIN WAVEFORM H SIZE NO POWER CIRCUIT NO CHECK REPLACE Q308 D308 YES NO CHECK IC301 28 WAVEFORM CHECK R...

Страница 24: ...2 0311 REV NO 0 TOVIS Color Monitor Service Manual PAGE 24 25 9 5 TROUBLE IN CONTRAST CONTRAST CHECK IC401 12 VOLTAGE NO CHECK REPLACE IC401 YES CHECK IC401 18 WAVEFORM NO CHECK REPLACE IC601 YES CHEC...

Страница 25: ...902EX DATE 2002 0311 REV NO 0 TOVIS Color Monitor Service Manual PAGE 25 25 9 6 TROUBLE IN BRIGHTNESS CHECK G1 VOLTAGE NO CHECK REPLACE D318 YES CHECK HT LINE NO CHECK POWER BOARD YES CHECK REPLACE Q5...

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