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Tovis MTG-1902EX Service Manual

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

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Summary of Contents for Tovis MTG-1902EX

  • Page 1 TOVIS P/N MTG-1902EX DATE 03/11/02 TOVIS REV.NO IGT P/N 69925601 PAGE 1/25 Color Monitor Service Manual MODEL: MTG – 1902EX TOVIS CO., LTD.

  • Page 2: Table Of Contents

    3. TECHNICAL FEATURES ------------------------------- 5 4. TIMING CHART ------------------------------------------- 6 5. SET UP ------------------------------------------------------ 7 6. CONTROLS AND ADJUSTMENTS ------------------ 8 7. ADJUSTMENT SPECIFICATIONS------------------- 13 8. DESCRIPTION OF CIRCUIT OPERATION ------- 16 9. TROUBLE SHOOTING --------------------------------- 20 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

    VGA 720*400 VGA 640*480 31.469KHz 31.469KHz 31.778㎲ 31.778㎲ 3.813㎲ 3.813㎲ 1.907㎲ 1.589㎲ 25.422㎲ 25.422㎲ 0.636㎲ 0.318㎲ POL. NEGATIVE NEGATIVE 70.087Hz 59.940Hz 14.268ms 16.683ms 0.064ms 0.064ms 1.112ms 0.794ms 12.711ms 15.253ms 0.381ms 0.064ms POL. POSITIVE NEGATIVE VIDEO ANALOG ANALOG TOVIS CO., LTD.

  • Page 7: Set Up

    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 MICROTOUCH DRAWER CONN. CONTROLLER SENSOR GLASS TOVIS CO., LTD.

  • Page 8: Controls And Adjustments

    DEGAUSS – perform degaussing if the OSD is not displayed. ③ DOWN/UP -When Main-Menu displayed, you can search each function using these keys. -When Sub-Menu displayed (after you select the function), you can change each state of the screen using these keys. O.S.D Control Sub-P.C.B TOVIS CO., LTD.
  • Page 9 2) Search the “BRIGHTNESS” sub-menu by using the “UP/DOWN” keys on the Main-Menu OSD. 3) Select the “BRIGHTNESS” by pressing the “SEL” key. Then the “BRIGHTNESS” OSD color should change from yellow to red. 4) Search “BRIGHTNESS” sub-menu using the “UP/DOWN” keys on the Main-Menu OSD. TOVIS CO., LTD.
  • Page 10 “CONTRAST” use the “UP/DOWN” keys and then adjust the same way as item 3, 4 and 5. 7) To finish the adjustment press the “MODE” key then the OSD will disappear. TOVIS CO., LTD.
  • Page 11 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 Main-Menu OSD come out as left below figure. TOVIS CO., LTD.
  • Page 12 Main-Menu. 5) Press the “MODE” key again to finish the adjustment. The OSD will disappear. L. RECALL. When you press the “RECALL” key, all user adjustment values are erased and replaced by factory adjustment values. TOVIS CO., LTD.

  • Page 13: Adjustment Specification

    7-3.4 Focus adjustment 1) Input the "H" character pattern with 31KHz 640*480. 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 14 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 15 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 16: Description Of Circuit Operation

    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 Frequency OUT PUT (MCU PIN) Resolution SUS- (kHz) (Hz) 720x400 28∼ 32.9 68∼ 72 640x480 " 58∼ 62 (Table 1) TOVIS CO., LTD.
  • Page 17 The free running frequency of the vertical oscillator is determined by the capacitor C342 at pin VCAP (pin22) of IC301. 2) Vertical amplitude Vertical amplitude is controlled by IC601 using I 3) Vertical position Vertical position is controlled by IC601 using I TOVIS P/N MTG-1902EX DATE 2002.03.11 TOVIS CO., LTD.
  • Page 18 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.
  • Page 19 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 20: Trouble Shooting

    TOVIS P/N MTG-1902EX DATE 2002.03.11 TOVIS REV.NO Color Monitor Service Manual PAGE 20/25 9. TROUBLE SHOOTING 9-1. NO POWER NO POWER CHECK C112 AC LEVEL CHECK & REPLACE F101, POWER CORD CHECK C114 DC LEVEL CHECK & REPLACE BD101 CHECK IC105 #7 WAVEFORM CHECK &...
  • Page 21 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 22 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 23 Color Monitor Service Manual PAGE 23/25 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 24 TOVIS P/N MTG-1902EX DATE 2002.0311 TOVIS REV.NO Color Monitor Service Manual PAGE 24/25 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 25 TOVIS P/N MTG-1902EX DATE 2002.0311 TOVIS REV.NO Color Monitor Service Manual PAGE 25/25 9-6. TROUBLE IN BRIGHTNESS CHECK G1 VOLTAGE CHECK & REPLACE D318 CHECK HT LINE CHECK POWER BOARD CHECK & REPLACE Q507 TOVIS CO., LTD.

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