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Kortek KT-1982F Service Manual

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COLOR CRT MONITOR
DOC. NO
KT-XX82X-SM
DATE
2004 .02. 02
REV. NO
0
REV. DATE
-
SERVICE
MANUAL
KT-1982F / KT-1982DF
KT-1782F / KT-1782DF
KT-2182F
KORTEK CORPORATION

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Summary of Contents for Kortek KT-1982F

  • Page 1: Service Manual

    COLOR CRT MONITOR DOC. NO KT-XX82X-SM DATE 2004 .02. 02 REV. NO REV. DATE SERVICE MANUAL KT-1982F / KT-1982DF KT-1782F / KT-1782DF KT-2182F KORTEK CORPORATION...

  • Page 2: Table Of Contents

    CONTENTS 1. PRECAUTIONS -------------------------------------------------- 3 2. PRODUCT SPECIFICATION -------------------------------- 6 3. OPERATING INSTRUCTION -------------------------------- 9 4. ADJUSTMENTS ------------------------------------------------- 11 5. TROUBLE SHOOTING GUIDE ---------------------------- 19 6. PART LIST ------------------------------------------------------- 29 7. BLOCK DIAGRAM --------------------------------------------- 34 8. CONNECTING DIAGRAM ----------------------------------- 35 9.

  • Page 3: Precautions

    1.Precautions 1-1. Safety precautions Warnings : Service should not be attempted by anyone unfamiliar with the necessary on this Monitor. The followings are the necessary precautions to be observed before servicing. 1) For continued safety, do not attempt to modify the circuit board. 2) Disconnect the AC power before servicing.
  • Page 4 1-1-2. Fire and Shock Hazard Before returning the monitor to the user,perform the following safety checks: 1) Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

  • Page 5: Servicing Precautions

    1-1-3. Product safety notices: Some electrical and mechanical parts have special safety related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher volt- age,wattage,etc. Parts that have special safety characteristics are identified by ¡â...

  • Page 6: Product Specification

    2. Product Specifications 2-1 SPECIFICATION KT-1982F KT-1982DF KT-1782F KT-1782DF KT-2182F Tube 19"No rmal flat 19"Dyna flat 17"Dyna flat 17"No rmal flat 21"No rmal flat Tube Size(Diagonal) 494 .8mm 494 .8mm 444 .0mm 444 .0mm 548 .0mm Viewabl e S ize (Dia gonal ) 457 .2mm...
  • Page 7 2-2 D-SUB SIGNAL CABLE SPECIFICATION PIN NO PIN NAME GREEN BLUE GND (DDC) R-GND G-GND B-GND SELF RASTER SDA (DDC) H-SYNC V-SYNC SCL (DDC)

  • Page 8: Timing Chart

    2-3 TIMING CHART HORIZONTAL VERTICAL VIDEO SYNC A : LINE TIME TOTAL B :HORIZONTAL SYNC WIDTH C : BACK PORCH D : ACTIVE TIME E : FRONT PORCH O : FRAME TIME TOTAL P : VERTICAL SYNC WIDTH Q : BACK PORCH R : ACTIVE TIME S : FRONT PORCH I.B.M...

  • Page 9: Operating Instruction

    3. Operating Instruction 3-1 FRONT FRAME KORTEK STANDARD FRAME (X-FRAM) 3.2 MAIN PCB ASS'Y MAIN PCB SOCKET PCB CONTROL PCB...
  • Page 10 3-3. Function of Control DOWN MENU (SELECT) EXIT (DEGAUSSING) Control Function The light of power LED changes according to each state. ¡Ý on mode : Green LED. (Power Indicator) ¡Ý power saving mode : green LED blinking. When you press this button, the MENU appears.The MENU will disappear in 10 seconds if you don't operate any button.

  • Page 11: Adjustments

    4.Adjustments 4-1. Adjustment Control 4-1-1. Before making Adjustments 1) Orientation When servicing, always face the monitor to east. 2) Warm-up time The monitor must be on for 30 minutes before starting alignment. Warm-up time is especially critical in color temperature and white balance adjustments.
  • Page 12 4-2. Display Control Adjustment Click on the "MENU" button (OSD MENU). This menu is user's OSD manual.(user's manual) ¢Å BRIGHTNESS 31.4KHz 60Hz 1) Click on the "MENU" button. 2) Click on the "UP"or "DOWN" and move any function control. 3) Press the "MENU(SELECT)" button. 4) "UP"...
  • Page 13 b) Vertical size adjustment adjustment : use to "V-SIZE" c) Horizontal position adjustment adjustment : use to "H-POS" d) Vertical position adjustment 4-2-2 Trapezoid adjustment frequency : all mode signal pattern : cross hatch £üA-B£ü< 2.5mm 4-2-3 Pin balance adjustment frequency : all mode signal pattern : cross hatch £üD1£ü,£üD2£ü¡Â1mm...
  • Page 14 4-2-5 Side pin-cushion adjustment frequency : all mode signal pattern : cross hatch brightness : MIN (cut-off) contrast : MAX £üC1£ü,£üC2£ü¡Â2.0mm, £üD1£ü,£üD2£ü¡Â2.0mm 4-2-6 Tilt adjustment frequency : all mode signal pattern : cross hatch brightness : MIN (cut-off) contrast : MAX 4-2-7 Degaussing adjustment Don't adjust the degaussing.
  • Page 15 4-3 Color adjustment 4-3-1 color temperature ¡Ø Set condition - measuring instrument : color analyzer (CA-100) - frequency : 48KHz / 60Hz (1024 x 768) - display pattern : full white , one square(20% window) - brightness : cut off - contrast : MAX ¡Ø...
  • Page 16 1. Select factory mode. 2. Select COLOR TEMP with UP,DOWN key. 3. Select 9300K. 4. Select B-G with UP,DOWN adjust y=0.311 and do the next selection with EXIT key. 6. Select R-G with UP,DOWN adjust y=0.281 and do the next selection with EXIT key.
  • Page 17 4. Select B-G with UP,DOWN adjust y=0.329 and do the next selection with EXIT key. 6. Select R-G with UP,DOWN adjust y=0.313 and do the next selection with EXIT key. 4-3-4 brightness uniformity adjustment ¡Ø set condition - frequency : 48KHz / 60Hz (1024x768) - display pattern : 9ball pattern - brightness : MIN (cut off) - contrast : MAX...
  • Page 18 set condition - direction : east - frequency : included timing chart - display pattern : full white - brightness : MIN (cut off) - display center Most suitable x=0.640 ¡¾ 0.015 y=0.323 ¡¾ 0.015 GREEN x=0.295 ¡¾ 0.015 y=0.594 ¡¾ 0.015 BLUE x=0.142 ¡¾...

  • Page 19: Troubleshooting Guide

    5. TROUBLESHOOTING GUIDE 5-1. Troubleshooting Guide. NOTES ; 1. If picture does not appear, fully rotate the brightness and contrast controls clockwise. 2. Check the following circuits. No raster appear : power circuit. Horizontal output circuit. High voltage control circuit and output circuit. High voltage develops but no raster appears : Video output circuit.
  • Page 20 5-1-3 Degaussing failure Check degauss Connector(CN101) Check output voltage at pin 12 of IC501 Replace IC501 (Normal : 0V, Degaussing: 5V) Does DC voltage right? Check and replace Q101,D101,RL101,R106 5-1-3 Purity failure Degaussing Purity is O.K Done Degaussing circuit Refer to 5-1-2 is right? Replace CRT and verify purity...
  • Page 21 5-1-4 Tilt Failure Check tilt connection (CN100) IC 501 pin 35 output varies with different values? Check and replace IC501 (DC 0V ¡- 5V) IC105 pin 10,11 output Check and replace IC105 varies with different values? (DC 1.5V~7.5V) Check and replace R-COIL of the CDT 6-1-6 Misconvergence Failure Try readjusting convergence...
  • Page 22 6-1-7 H-Linearity Failure Check pin 36 of IC501 output varies with different value? Check and replace IC501 (DC 0V ¡- 5V) Check pin 7,8 of IC105 output varies with different Check and replace IC105 value? (DC 1V ~ 6V) Check L304 output varies with different value? L304 6-1-8 High Voltage Failure...
  • Page 23 5-1-9 User control Failure Others Check the voltage at pin 21 of IC501 Normal : 5V Push the EXIT Key : 0.5V Push the SEL Key : 1.5V Push the UP Key : 3.5V Push the DOWN Key : 2.5V Check and replace R401,R403,R405,R406 5-1-10 Dynamic Focus Failure or poor Focus...
  • Page 24 5-1-11 Visible Retrace Check G2 control voltage Is G2 voltage (580 ¡¾ 50V) right? and FBT Does Q201 collector pulse Check 80V Line and D719,C726 (35Vp-p) exist? Does Q201 base drive Check The G1 wave form exist? Check and replace IC201 Q201 COLLECTOR 5-1-12 ACL Failure Input full white pattern to monitor...

  • Page 25: Micom Failure

    5-1-13 Micom Failure Does 5V appear Pin6 of IC501? X501 IC501 Pin8 and pin8 wave Check and replace form are right? X501,C516,C517 IC501 Pin 5 is over than Check and replace R517 4.5Volt ? All input/output value Check and replace IC502 are right? Done 5-1-14 No Raster...

  • Page 26: No Video

    5-1-15 No Video Check signal cable and connector IC802 Pin5,Pin8,Pin10 video Check IC201 and input are right? 12V Line Check and replace IC802 Pin21,Pin24,Pin26 IC802 video output are right? IC803 Pin5,Pin3,Pin1 Check IC803 and video output are right? 12V,80V Line R,G,B cathode wave Check D805~807 and forms are right?
  • Page 27 5-1-16 Abnormal & Invariable H-size IC 301 Pin24 output Check and replace IC301 parabola level variable? and 12V,80V Line? Does T303 Pin8 pulse Check and replace T303? is appear?? Check some parts around T301 are they OK? Check and replace Q314? IC301 24pin 5-1-17 OSD failure...
  • Page 28 5-1-18 V-deflection failure Does 14V DC appear at Pin2 of IC201? Refer to No power supply Does -14V DC appear at Pin5 of IC201? IC 301 Pin 13,Pin 23 Check and replace IC301? output exist? IC 501 Pin 33 output Check and replace IC501? exist? Check and replace IC201?

  • Page 29: Part List

    6. PART LIST 6-1. KT-1982F PART PIST 1 0 2 -1 9 8 2 21 1 8 0 K T -19 8 2 F M A INM A N U A L 1 P C SM A INP C BAS S 'Y 1 2 7 -4 1 0 2 3R 3 8 T S M BP5 0 V 3.3U FT /P C A P .
  • Page 33 6-2. DIFFERENT PART LIST BY MODEL MODEL N O L O C A T IO N S P E C . K T -1 9 82 F K T -1 9 8 2 D F K T -17 8 2 F K T -17 8 2 D F K T -2 1 8 2F C 3 3 8...

  • Page 34: Block Diagram

    7. BLOCK DIAGRAM SWITCHING INLET VIDEO AMP VIDEO IC ( 6S1265 ) SIGNAL 6.3V SWITCHING SOCKET OUTPUT INPUT ( KA2506 ) (LM2405 ) MODE POWER PROCESSOR BRIDGE -14V LINE ( WT6802 ) CUT-OFF DIODE FILTER SUPPLY CONTROL 220V FEEDBACK I©÷ C I©÷C CONTROL DEGAUSSING...

  • Page 35: Connecting Diagram

    8. CONNECTING DIAGRAM CLAM P A CL S DA S CL D-SUB S CL CN120 S DA S ELF CABLE V -S YNC H-SY NC +12V CN503 H-FLY V -F LY CONTROL PCB +6. 3V +80V CN801 K EY K EY CN502 CN100 CN101...

  • Page 36: Schematic

    9. SCHEMATIC 9-1 MAIN C101 R101 220V 14V-1 IC101 0.01U,M 1 8 0 K , 1 W KA7805 O U T 3 R742 15*10*30 27K,F 6.3V R103 R104 R105 C103 TH101 220K 6.8K C102 220U,16V R743 D704 CN101 9OHM,CASE 4.7K R102 Q 1 0 1 R106...
  • Page 37 9. SCHEMATIC 9-2 VIDEO + 1 2 V + 5 V + 6 . 3 V + 8 0 V C N 8 0 1 C L A M P A C L S C L S D A H _ F L Y + 5 V + 5 V V _ F L Y...

  • Page 38: Print Circuit Board

    10. PRINT CIRCUIT BOARD 10-1 MAIN 196mm 246mm...
  • Page 39 10. PRINT CIRCUIT BOARD 10-2 VIDEO 98mm 128mm 30mm 107mm 150mm...
  • Page 40 10. PRINT CIRCUIT BOARD 10-3 PCB DIMENSION *82.5mm * 110mm 61mm 13mm 13.8mm 84mm 248mm 68mm 60.5mm 68.3mm 196.8mm...
  • Page 41 84.5mm 68.5mm...

This manual is also suitable for:

Kt-1782dfKt-2182fKt-1982dfKt-1782f

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