1. Manuals
  2. Brands
  3. Tovis Manuals
  4. Monitor
  5. MTG-1971XT
  6. Service manual

Tovis MTG-1971XT Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

TOVIS P/N
MTG-1971XT
DATE
03/11/02
TOVIS
REV NO.
0
IGT P/N
69926200 / 69923301
PAGE
1/30
Color Monitor Service Manual
MODEL: MTG – 1971XT
TOVIS CO., LTD.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MTG-1971XT and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Tovis MTG-1971XT

Summary of Contents for Tovis MTG-1971XT

  • Page 1 TOVIS P/N MTG-1971XT DATE 03/11/02 TOVIS REV NO. IGT P/N 69926200 / 69923301 PAGE 1/30 Color Monitor Service Manual MODEL: MTG – 1971XT TOVIS CO., LTD.

  • Page 2: Table Of Contents

    2. SPECIFICATIONS----------------------------------------- 4 3. TECHNICAL FEATURES ------------------------------- 5 4. TIMING CHART ------------------------------------------- 6 5. SET-UP ------------------------------------------------------ 8 6. CONTROLS AND ADJUSTMENTS ------------------ 9 7. ADJUSTMENT SPECIFICATIONS------------------- 18 8. DESCRIPTION OF CIRCUIT OPERATIONS------ 21 9. TROUBLE SHOOTING --------------------------------- 25 TOVIS CO., LTD.

  • Page 3: Safety Precautions

    Reverse the AC plug 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.

  • Page 4: Specifications

    ∙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 TOVIS CO., LTD.

  • Page 5: Technical Features

    Then, 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 the 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: Set-Up

    Your monitor starts up automatically when you insert the power plug to the 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.

  • Page 9: Controls And Adjustments

    DEGAUSS – Do degaussing in the state that 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 selecting the function), you can change each state of the screen using these keys. TOVIS CO., LTD.
  • Page 10 1) Press the “MODE” key then Main-Menu OSD should come out as below figure. 2) Search “BRIGHTNESS” sub-menu using the “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.
  • Page 11 “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 12 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. min->1-99->max TOVIS CO., LTD.
  • Page 13 1) Press the “MODE” key for the Main-Menu OSD. 2) Search “LANGUAGE” sub-menu using “UP/DOWN” key on the Main-Menu OSD. 3) Select the “LANGUAGE” by pressing “SEL” key. Then The Language sub-menu comes out as right below figure. TOVIS CO., LTD.
  • Page 14 Press the “MODE” and “DOWN” key simultaneously until the OSD comes out as below. The OSD factory mode is the same format as the user mode except the color Of the bottom line. (User mode is blue; factory mode is red as shown below) TOVIS CO., LTD.

  • Page 15: Tovis Rev No

    1) After finishing the adjustment; search “RECALL” using “UP/DOWN” key. 2) Press “SEL” key until OSD disappears then the adjusted value is saved and exits from the factory mode. C.Adjustment. All adjustment methods are the same as the user’s control mode except “COLOR”. TOVIS CO., LTD.
  • Page 16 D.COLOR ADJUSTMENT. 1) Before adjusting “COLOR”, “CONTRAST” and “BRIGHTNESS” fix levels at maximum. (It’s a TOVIS’s reference condition.) 2) At the factory mode, search “COLOR” using “UP/DOWN” key. 3) Select “COLOR” by pressing “SEL” key then color sub-menu comes out as left below figure.
  • Page 17 TOVIS P/N MTG-1971XT DATE 2002.03.11 TOVIS REV NO. Color Monitor Service Manual PAGE 17/30 9300 GAIN 9300 BIAS 6500 GAIN 6500 BIAS GAIN BIAS. “SEL” and “UP/DOWN” TOVIS CO., LTD.

  • Page 18: Adjustment Specifications

    7-3.4 Focus adjustment. 1) Input the "H" character pattern with 48KHz 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 19 At the same time, center the raster vertically. ⑦Move the yoke slowly forward until a uniform green screen is obtained. Tighten the clamp screw of the yoke temporarily. ⑧Check the purity of the red and blue raster by adjusting the bias controls. TOVIS CO., LTD.
  • Page 20 Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines ⑥.Repeat adjustment 3,4,5 Keeping in mind red, green and blue movement, because 4-Pole Magnets and 6-Pole Magnets interact and make dot movement complex. TOVIS CO., LTD.

  • Page 21: Description Of Circuit Operations

    1024x768 " 52∼ 61.9 83∼ 87 800x600 68∼ 72 1024x768 " 73∼ 77 1024x768 " 62∼ 70 58∼ 62 1280x1024 62∼ 70 83∼ 87 1024x768 H≤ 10 NORMAL NORMAL V≤ 40 H≤ 10 V≤ 40 (Table 1) TOVIS CO., LTD.
  • Page 22 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 23 Q316,Q317 is off when horizontal frequency is 37KHz. Q316,Q318 is off when horizontal frequency is 43KHz-52KHz. Q317,318 is off when horizontal frequency is 53KHz∼ 61KHz. Q316,Q317,Q318 is off when horizontal frequency is 62KHz∼ 70KHz. Q316,Q318 is off when input is override condition. TOVIS CO., LTD.
  • Page 24 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 25: Trouble Shooting

    9-1. NO POWER NO POWER CHECK C101 AC LEVEL CHECK & REPLACE F101, POWER CORD, F101 CHECK C104 DC LEVEL CHECK & REPLACE BD101 CHECK IC101 #1 WAVEFORM CHECK & REPLACE IC101 CHECK & REPLACE SECONDARY VOLTAGE OF T101 TOVIS CO., LTD.
  • Page 26 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 27 9-3. NO RASTER NO RASTER CHECK HV & G2 CHECK Q308 WAVEFORM CHECK & REPLACE CHECK FBT,CRT G1 & DC 80V CHECK L304 DC 55V CHECK & REPLACE CHECK & REPLACE Q507,Q508,Q509 Q113, Q307, D315 CHECK & REPLACE D110 TOVIS CO., LTD.
  • Page 28 Color Monitor Service Manual PAGE 28/30 9-4. TROUBLE IN HORIZONTAL SIZE H-SIZE CHECK IC601 #19 WAVEFORM CHECK & REPLACE IC601 CHECK Q309 COLLECTOR WAVEFORM CHECK & REPLACE Q309 CHECK IC301 #24 WAVEFORM CHECK & REPLACE IC301 CHECK & REPLACE IC302 TOVIS CO., LTD.
  • Page 29 DATE 2002.03.11 TOVIS REV NO. Color Monitor Service Manual PAGE 29/30 9-5. TROUBLE IN CONTRAST CONTRAST CHECK IC401 #12 VOLTAGE CHECK & REPLACE IC401, R518,ZD501 CHECK IC401 #18 WAVEFORM CHECK & REPLACE IC601 CHECK & REPLACE IC401 TOVIS CO., LTD.
  • Page 30 TOVIS P/N MTG-1971XT DATE 2002.03.11 TOVIS REV NO. Color Monitor Service Manual PAGE 30/30 9-6. TROUBLE IN BRIGHTNESS BRIGHTNESS CHECK G1 VOLTAGE CHECK & REPLACE Q202 CHECK C504 VOLTAGE CHECK & REPLACE R520,D506 CHECK & REPLACE Q507,Q508 TOVIS CO., LTD.

Table of Contents