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TOVIS P/N

MTG-1971XT

DATE

03/11/02

REV NO.

0

TOVIS

IGT P/N

69926200 / 69923301

PAGE

1/30

Color Monitor Service Manual

MODEL: MTG – 1971XT

TOVIS CO., LTD.

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Summary of Contents for MTG-1971XT

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

Page 2: ...r Service Manual PAGE 2 30 I N D E X 1 SAFETY PRECAUTIONS 3 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 DESCRIPT...

Page 3: ...of these components read the parts list in this manual carefully 1 3 When replacing chassis in the cabinet always be certain that all the protective devices are installed properly such as insulating...

Page 4: ...ntal Sync TTL Level Positive or Negative pulse Scanning 28Khz 70KHz Vertical Input TTL Level Positive or Negative pulse Scanning 40 160Hz 2 3 Power Supply Power Input AC100 240V 60 50Hz Fuse Rating 25...

Page 5: ...rs in the circuit the protection circuit operate in order to prevent the components from electrical shock or other risks 3 4 Override function It is designed for the normal display when the monitor is...

Page 6: ...Hz A 31 778 31 778 28 251 26 667 B 3 813 3 813 3 920 2 032 C 1 907 1 589 1 247 3 810 D 25 422 25 422 22 806 20 317 E 0 636 0 318 0 170 0 508 H POL NEGATIVE NEGATIVE POSITIVE NEGATIVE FH 70 087Hz 59 94...

Page 7: ...677 B 3 200 1 616 2 400 2 231 C 2 200 3 232 1 280 1 615 D 20 000 16 162 16 000 15 754 E 1 000 0 323 1 119 0 998 H POL POSITIVE POSITIVE POSITIVE NEGATIVE FV 60 317Hz 75 000Hz 72 188Hz 60 004Hz A 16 57...

Page 8: ...020Hz 84 997Hz A 11 756ms 14 272ms 13 328ms 16 638ms 11 765ms B 0 056ms 0 106ms 0 050ms 0 047ms 0 044ms C 0 503ms 0 513ms 0 466ms 0 594ms 0 524ms D 11 179ms 13 599ms 12 795ms 16 005ms 11 183ms E 0 019...

Page 9: ...RXD 25 AC NEUTRAL 13 NET TXD 6 CONTROLS AND ADJUSTMENTS There are four switches on the control panel Adjustable controls allow the best display status for individual preferences 6 1 Key Function MODE...

Page 10: ...ical Position Vertical Size Side Pincushion Trapezoid Pin Balance Parallelogram MAIN PCB VR control VR501 VR301 FBT Sub Bright H V Adjustment Focus and Screen 6 3 OSD Controls User s control A BRIGHTN...

Page 11: ...Press the MODE key then the BRIGHTNESS OSD color should change from red to yellow and the changed brightness value saved automatically 6 If you want to adjust other functions search your sub menu For...

Page 12: ...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 ADJUST SA...

Page 13: ...its corresponding color ex RED goes to red color 6 Adjust RED GREEN or BLUE using UP DOWN key 7 Press MODE key to finish the color adjustment then the OSD goes back to Main Menu 8 Press the MODE key a...

Page 14: ...ol This monitor has two adjustment modes One is for the user s own adjustment and the other is only for factory adjustments Factory adjustments may be required during repair Incorrect factory adjustme...

Page 15: ...30 B Exit and save 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...

Page 16: ...AS means low beam area s adjustment 5 Select an item by pressing SEL key then the OSD changes to under sub menu as right below figure 6 Adjust color temperature using UP DOWN and SEL key UP DOWN key m...

Page 17: ...TOVIS P N MTG 1971XT DATE 2002 03 11 REV NO 0 TOVIS Color Monitor Service Manual PAGE 17 30 9300 GAIN 9300 BIAS 6500 GAIN 6500 BIAS At RG GG GAIN BG CO OR At RB GB BIAS BB SEL and UP DOWN TOVIS CO LTD...

Page 18: ...the crosshatch pattern with the 48KHz 1024 768 mode 2 After connecting a digital voltage meter to the each pin of D316 anode and cathode adjust FBT B voltage to 114V 1 0V using VR301 7 3 2 G2 Voltage...

Page 19: ...just the color temperature to be X 0 281 0 015 and Y 0 311 0 015 by R G B gain on OSD menu 3 Adjust CONTRAST to be 40FT With Touch 7 3 6 Purity and Convergence Adjustment 1 Purity Adjustment Demagneti...

Page 20: ...between them See figure 1 and superimpose red and blue vertical lines in the center area of the picture screen Turn both tabs at the same time keeping their angles constant to superimpose red and blu...

Page 21: ...z Resolution Hf kHz Vf Hz CS3 38 CS2 39 CS1 40 SUS 4 1 31 70 720x400 28 32 9 68 72 L L L H 2 31 60 640x480 58 62 L L L H 3 35 86 1024x768 33 35 9 84 88 H L L H 4 38 75 640x480 36 40 9 73 77 H H L H 5...

Page 22: ...d it is used for H scan voltage control driver 5 X ray protection When the fly back voltage rises up to an unacceptable level X ray protection is activated X ray input pin 13 of IC601 is above 4V This...

Page 23: ...Line driver stage As a driver device small MOSFET Q307 IRF630 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 Hori...

Page 24: ...increased contrast is set at the certain limited level 28FL in white pattern that is set by inner voltage of IC401 8 8 Video amplification section 8 8 1 Video pre amplifier IC401 Input video signals...

Page 25: ...e Manual PAGE 25 30 9 TROUBLE SHOOTING 9 1 NO POWER NO POWER CHECK C101 AC LEVEL NO CHECK REPLACE F101 POWER CORD F101 YES CHECK C104 DC LEVEL NO CHECK REPLACE BD101 YES CHECK IC101 1 WAVEFORM NO CHEC...

Page 26: ...0 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 C...

Page 27: ...itor Service Manual PAGE 27 30 9 3 NO RASTER NO RASTER YES CHECK REPLACE Q113 Q307 D315 CHECK HV G2 CHECK Q308 WAVEFORM CHECK G1 DC 80V CHECK L304 DC 55V CHECK REPLACE FBT CRT NO NO YES CHECK REPLACE...

Page 28: ...nitor Service Manual PAGE 28 30 9 4 TROUBLE IN HORIZONTAL SIZE YES CHECK IC601 19 WAVEFORM CHECK Q309 COLLECTOR WAVEFORM H SIZE NO CHECK REPLACE IC601 CHECK REPLACE Q309 NO YES CHECK IC301 24 WAVEFORM...

Page 29: ...1 REV NO 0 TOVIS Color Monitor Service Manual PAGE 29 30 9 5 TROUBLE IN CONTRAST CONTRAST CHECK IC401 12 VOLTAGE NO CHECK REPLACE IC401 R518 ZD501 YES CHECK IC401 18 WAVEFORM NO CHECK REPLACE IC601 YE...

Page 30: ...71XT DATE 2002 03 11 REV NO 0 TOVIS Color Monitor Service Manual PAGE 30 30 9 6 TROUBLE IN BRIGHTNESS BRIGHTNESS CHECK G1 VOLTAGE NO CHECK REPLACE Q202 YES CHECK C504 VOLTAGE NO CHECK REPLACE R520 D50...

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