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Tovis MTG-1902MM Service Manual

Color monitor
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TOVIS P/N
MTG-1902MM
DATE
05/11/02
TOVIS
REV.NO
0
IGT P/N
69925300
PAGE
1/27
Color Monitor Service Manual
MODEL: MTG – 1902MM
TOVIS CO., LTD.

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Summary of Contents for Tovis MTG-1902MM

  • Page 1 TOVIS P/N MTG-1902MM DATE 05/11/02 TOVIS REV.NO IGT P/N 69925300 PAGE 1/27 Color Monitor Service Manual MODEL: MTG – 1902MM TOVIS CO., LTD.

  • Page 2: Table Of Contents

    2. SPECIFICATIONS----------------------------------------- 4 3. TECHNICAL FEATURES ------------------------------- 5 4. TIMING CHART ------------------------------------------- 6 5. SET UP ------------------------------------------------------ 9 6. CONTROLS AND ADJUSTMENTS ------------------10 7. ADJUSTMENT SPECIFICATIONS------------------- 15 8. DESCRIPTION OF CIRCUIT OPERATION ------- 18 9. TROUBLE SHOOTING --------------------------------- 22 TOVIS CO., LTD.

  • Page 3: Safety Precautions

    Reverse the AC plug, 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. TOVIS CO., LTD.

  • Page 4: Specifications

    ∙Power Consumption Normal : less than 85W 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 : 17kg TOVIS CO., LTD.

  • Page 5: Technical Features

    These adjusted settings are kept in memory even if you change resolution mode or turn off the monitor. 3-6. I C BUS control It is designed by I C BUS control for simplifying circuit. TOVIS CO., LTD.

  • Page 6: Timing Chart

    NEGATIVE POSITIVE NEGATIVE 70.087Hz 59.940Hz 86.960KHz 75.000Hz 14.268ms 16.683ms 11.500ms 13.333ms 0.064ms 0.064ms 0.113ms 0.080ms 1.112ms 0.794ms 0.563ms 0.427ms 12.711ms 15.253ms 10.810ms 12.800ms 0.381ms 0.064ms 0.014ms 0.027ms POL. POSITIVE NEGATIVE POSITIVE NEGATIVE VIDEO ANALOG ANALOG ANALOG ANALOG TOVIS CO., LTD.
  • Page 7 POSITIVE POSITIVE NEGATIVE 60.317Hz 75.000Hz 72.188Hz 60.004Hz 16.579ms 13.333ms 13.853ms 16.666ms 0.106ms 0.064ms 0.125ms 0.124ms 0.607ms 0.448ms 0.478ms 0.600ms 15.840ms 12.800ms 12.480ms 15.880ms 0.026ms 0.021ms 0.772ms 0.062ms POL. POSITIVE POSITIVE POSITIVE NEGATIVE VIDEO ANALOG ANALOG ANALOG ANALOG TOVIS CO., LTD.
  • Page 8 11.756ms 14.272ms 13.328ms 16.638ms 11.765ms 0.056ms 0.106ms 0.050ms 0.047ms 0.044ms 0.503ms 0.513ms 0.466ms 0.594ms 0.524ms 11.179ms 13.599ms 12.795ms 16.005ms 11.183ms 0.019ms 0.054ms 0.017ms 0.016ms 0.015ms POL. POSITIVE NEGATIVE POSITIVE POSITIVE POSITIVE VIDEO ANALOG ANALOG ANALOG ANALOG ANALOG TOVIS CO., LTD.

  • Page 9: Set Up

    TOVIS REV.NO Color Monitor Service Manual PAGE 9/27 5. SET UP 5-1. Start Up Your monitor starts up automatically when you insert the power plug to power source. AMP 25PIN MICROTOUCH MICROTOUCH DRAWER CONN. CONTROLLER SENSOR GLASS TOVIS CO., LTD.

  • Page 10: Controls And Adjustments

    DEGAUSS – Do degaussing if the OSD isn’t displayed. ③ DOWN/UP -When the Main-Menu is displayed, you 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. O.S.D Control Sub-P.C.B TOVIS CO., LTD.
  • Page 11 2) Search “BRIGHTNESS” sub-menu by using the “UP/DOWN” key on the Main-Menu OSD. 3) Select the “BRIGHTNESS” by pressing the “SEL” key. Then the “BRIGHTNESS” OSD color changes from yellow to red. 4) Search the “BRIGHTNESS” sub-menu using the “UP/DOWN” key on the Main-Menu OSD. TOVIS CO., LTD.
  • Page 12 6) If you want to adjust other functions, search your sub-menu. For example, if you want to adjust the “CONTRAST” use the “UP/DOWN” keys and then adjust the same way as item 3),4) and 5). To finish the adjustment press the “MODE” key then the OSD will disappear. TOVIS CO., LTD.
  • Page 13 ADJUST SAME WAY AS ABOVE I. PARALLELOG ADJUST SAME WAY AS ABOVE J. PIN BALANCE ADJUST SAME WAY AS ABOVE K. COLOR ADJUSTMENT. 1) Press the “MODE” key then the Main-Menu OSD come out as left below figure. min->1-99->max TOVIS CO., LTD.
  • Page 14 L. RECALL. When you press the “RECALL” key, all user’s adjustment values are erased and covered by factory adjustment value. At first stage without any user adjustments, The monitor is set up by the factory adjustment value. TOVIS CO., LTD.

  • Page 15: Adjustment Specifications

    1) Input the "H" character pattern with 60KHz 1024*768 . 2) Adjust the focus for the best balance at each point of A, B, C, D, E as shown below by rotating the focus VR of FBT. TOVIS CO., LTD.
  • Page 16 At the same time, center the raster vertically. ⑦Move the yoke forward slowly until a uniform green screen is obtained. Tighten the clamp screw of the yoke temporarily. TOVIS CO., LTD.
  • Page 17 Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines ⑥.Repeat adjustment ③, ④ and ⑤. Keeping in mind red, green and blue movement, because 4-Pole Magnets and 6-Pole Magnets are interacted and make dot movement complex. TOVIS CO., LTD.

  • Page 18: Description Of Circuit Operation

    1024x768 " 58∼ 62 52∼ 61.9 83∼ 87 800x600 68∼ 72 1024x768 " 1024x768 " 73∼ 77 1280x1024 62∼ 70 58∼ 62 1024x768 62∼ 70 83∼ 87 H≤ 10 NORMAL V≤ 40 NORMAL H≤ 10 V≤ 40 TOVIS CO., LTD.
  • Page 19 Vertical position is controlled by IC601 using I 4) East-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 TOVIS CO., LTD.
  • Page 20 Q316 is off when horizontal frequency is 35KHz. Q317 is off when horizontal frequency is 37KHz. Q316,Q318 is off when horizontal frequency is 44KHz~52KHz. Q317,318 is off when horizontal frequency is 53KHz∼ 61KHz. Q316,Q317,Q318 is off when horizontal frequency is 62KHz∼ 70KHz. TOVIS CO., LTD.
  • Page 21 Q405, Q406 and Q407, which is operated by I2C BUS control through u-com, adjust cutoff voltages. 8-8.3. OSD(On Screen Display : IC403) The OSD signal is applied from IC403 to IC402. It is controlled by I C BUS control line. TOVIS CO., LTD.

  • Page 22: Trouble Shooting

    AC LEVEL CHECK& REPLACE F101, POWER CORD CHECK C114 DC LEVEL CHECK & REPLACE BD101 CHECK IC105 #7 WAVEFORM CHECK & REPLACE IC105 CHECK IC101 #3 WAVEFORM CHECK & REPLACE IC101 CHECK & REPLACE SECONDARY VOLTAGE OF T101 TOVIS CO., LTD.
  • Page 23 CHECK & REPLACE SIGNAL CABLE CHECK IC401 #21,24,26 PULSE CHECK IC401 #23 DC LEVEL & #18,19 PULSE CHECK & REPLACE IC601,Q204 CHECK & REPLACE IC401 CHECK IC402 #1,3,5 PULSE CHECK & REPLACE IC402 CHECK & REPLACE CRT SOCKET, G1 TOVIS CO., LTD.
  • Page 24 24/27 9-3. NO RASTER NO RASTER CHECK HV & G2 CHECK Q319 WAVEFORM CHECK & REPLACE CHECK FBT,CRT G1 & DC 80V CHECK Q319 BASE CHECK & REPLACE CHECK & REPLACE Q507 Q313,Q311,D312 CHECK & REPLACE Q307,Q309,Q310 TOVIS CO., LTD.
  • Page 25 REV.NO Color Monitor Service Manual PAGE 25/27 9-4. TROUBLE IN HORIZONTAL SIZE H-SIZE CHECK 45V POWER CIRCUIT CHECK Q352 DRAIN WAVEFORM CHECK & REPLACE Q308,D308 CHECK IC301 #28 WAVEFORM CHECK & REPLACE IC301 CHECK & REPLACE Q353,354 TOVIS CO., LTD.
  • Page 26 TOVIS P/N MTG-1902MM DATE 2002.05.11 TOVIS REV.NO Color Monitor Service Manual PAGE 26/27 9-5. TROUBLE IN CONTRAST CONTRAST CHECK IC401 #12 VOLTAGE CHECK & REPLACE IC401 CHECK IC401 #18 WAVEFORM CHECK & REPLACE IC601 CHECK & REPLACE IC401 TOVIS CO., LTD.
  • Page 27 TOVIS P/N MTG-1902MM DATE 2002.05.11 TOVIS REV.NO Color Monitor Service Manual PAGE 27/27 9-6. TROUBLE IN BRIGHTNESS BRIGHTNESS CHECK G1 VOLTAGE CHECK & REPLACE D318 CHECK HT LINE CHECK POWER BOARD CHECK & REPLACE Q507 TOVIS CO., LTD.

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