DAEWOO ELECTRONICS 712D Service Manual Download Page 2

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CONTENTS

SAFETY PRECAUTIONS

GENERAL SAFETY INFORMATION

SERVICING PRECAUTIONS

TECHNICAL INFORMATION

GENERAL INFORMATION

PIN CONNECTOR

CAUTIONS FOR ADJUSTMENT AND REPAIR

OPERATION AND ADJUSTMENT

ALIGNMENT PROCEDURE

TROUBLESHOOTING HINTS

BLOCK DIAGRAM

PCB LAYOUT

SCHEMATIC DIAGRAM

EXPLODED VIEW & MECHANICAL PARTS LIST

INFORMATION OF PART DESCRIPTION

ELECTRICAL PARTS LIST

Summary of Contents for 712D

Page 1: ...ServiceManual XGA COLOR MONITOR Model 712D DAEWOO ELECTRONICS CO LTD OVERSEAS SERVICE DEPT ...

Page 2: ...N 6 GENERAL INFORMATION 7 PIN CONNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REPAIR 8 OPERATION AND ADJUSTMENT 9 ALIGNMENT PROCEDURE 13 TROUBLESHOOTING HINTS 15 BLOCK DIAGRAM 31 PCB LAYOUT 32 SCHEMATIC DIAGRAM 36 EXPLODED VIEW MECHANICAL PARTS LIST 39 INFORMATION OF PART DESCRIPTION 40 ELECTRICAL PARTS LIST 41 ...

Page 3: ...ential that these critical parts should be replaced with manufacturer s specified parts to prevent X Ray shock fire or other hazards Do not modify the original design without getting written permission from DAEWOO ELECTRONICS CO or this will void the original parts and labor warranty CAUTION No modifications of any circuits should be attempted Service work should be performed only after you are th...

Page 4: ...sult in damage to the equipment or other property WARNING Statements identify conditions or practices that could result in personal injury or loss of life Terms as marked on equipment CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the marking or a hazard which is properly included on the equipment itself WARNING Statements are clearly concerning indica...

Page 5: ...to the contacts with a pipe cleaner cotton tipped stick or comparable nonabrasive applicator 10 by volume Aceton and 90 by volume isopropyl alchohol 90 99 strength 6 Do not damage any plug socket B voltage interlocks with which instruments covered by this service manual might be equipped 7 Do not apply AC power to this instrument and or any other of its electrical assemblies unless all the solid s...

Page 6: ...ectrically shorted together by conductive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of replacement ES devices touch the protective material to the chassis or circuit assembly into which the device will be installed 8 Minimize bodily movements when handling unpackaged replacement ES devices Otherwise harmful motion such...

Page 7: ...an anti static suction type solder removal device or with desoldering braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush lt is not necessary to reapply acrylic coating to the area Small Signal Discrete Transistor Remova...

Page 8: ...polarity wrap each lead out of the new diode around the corresponding lead on the circuit board 4 Securely crimp each connection and solder it 5 Inspect the solder joints of the two original leads on the circuit board copper side If they are not shiny reheat them and apply additional solder if necessary TECHNICAL INFORMATION CDT Size 17 inch Diagonal visible image area 16 inch Dot Pitch 0 25 mm Sy...

Page 9: ...from 50Hz to 160Hz This color monitor supports IBM PC PC XT PC AT personal System 2 PS 2 Apple Macintosh and compatible users crisp text and vivid color graphics display when using the following graphics adapters VGA 8514 A Super VGA VESA and XGA and Apple Macintosh Video Card And so this color monitor has a maximum horizontal resolution of 1600 dots and a maximum vertical resolution of 1200 lines...

Page 10: ...stment procedure described in the service manual is made by a visual check Allow 20 minutes warm up time for the display before checking or adjusting only electrical specification or function Reform the leadwire after any repair work Caution For Servicing In case of servicing or replacing CRT high voltage sometimes remains in the anode of the CRT Completely discharge high voltage before servicing ...

Page 11: ...ed function Move cursor to the left window on the OSD window Decrease the value of any selected function Launch OSD On Screen Display MENU window Move cursor to the high window on the OSD window Increase the value of V size or V center Move cursor to the low window on the OSD window Decrease the value of V size or V center ...

Page 12: ...10 Key Process When you choose the icon on the OSD window you can exit the OSD screen Hot Key BRIGHTNESS CONTRAST DEUTSCH ENGL SH ESPAÑOL FRANCA S TAL ANO Start MENU ...

Page 13: ...V CENTER Choose different preset color temperatures or set your own customized color parameters Adjust the red gain Adjust the green gain Adjust the blue gain COLOR TEMP RED GAIN GREEN GAIN BLUE GAIN Adjust the red bias Adjust the green bias Adjust the blue bias RED BIAS GREEN BIAS BLUE BIAS ICON CONTROL FUNCTIONS OSD Functions Adjust the vertical picture moire cancellation V MOIRE Adjust the focu...

Page 14: ...towards left or right PIN BALANCE TRAPEZOID Adjust the pin W control when the sides of the screen are in a W shape PIN W Control Degauss the display and restore image quality DEGAUSS Reset the screen to the Factory Preset Display Settings Display a RGB Color Bar to determine whether the screen color is expressed normally or not TEST PATTERN RECALL Display horizontal vertical frequency and polarity...

Page 15: ...ocus control of FBT to obtain best Focus 4 Geometric Distortion Adjustment a Receive the cross hatch pattern factory preset mode b Pincushion Trapezoid are adjusted the best geometric status 5 White Balance Adjustment a Select 9300 K on the OSD Menu b Receive a full white pattern of 91KHz mode signal by using the signal generator c Set the brightness control to maximum and the contrast control to ...

Page 16: ... the brightness to the desired condition c Vertical red and blue lines are converged by varying the angles between the two tabs of the 4 pole magnets d Horizontal red and blue lines are converged by varying the tabs together and keeping the angle between them constant e Apply a yellow cross hatch pattern on the display f Vertical green and red lines are converged by barying the angle between the t...

Page 17: ...15 TROUBLESHOOTING HINTS 1 No Character ...

Page 18: ...16 2 No Raster ...

Page 19: ...17 3 A Missing Color ...

Page 20: ...18 4 Abnormal OSD Font ...

Page 21: ...19 5 Horizontal Output Circuit MODE P6 Voltage VGA 31 5KHz 48V S VGA 37 8KHz 60V XGA 46K 72V CAD 68K 109V 81KHz 129V 93KHz 144V ...

Page 22: ...20 6 Unstable Picture 6 1 Horizontal ...

Page 23: ...21 6 2 Vertical ...

Page 24: ...22 7 Focus ...

Page 25: ...23 7 1 Dynamic Focus ...

Page 26: ...24 8 Convergence ...

Page 27: ...25 9 Abnormal Picture 9 1 Horizontal Size At first adjust controls in the OSD Menu MODE Scan B VGA 48V S VGA 60V XGA 46K 72V CAD 68K 109V 81K 129V 93K 144V The B are as follows ...

Page 28: ...26 9 2 Vertical Size ...

Page 29: ...27 10 High Voltage Output Circuit Test mode 91KHz ...

Page 30: ...28 11 Side Pincushion Circuit ...

Page 31: ...29 12 Power Supply Unit P S U ...

Page 32: ...30 ...

Page 33: ...31 BLOCK DIAGRAM ...

Page 34: ...32 PCB LAYOUT Main PCB Component Side ...

Page 35: ...33 Main PCB Solder Side ...

Page 36: ...34 CRT PCB Component Side ...

Page 37: ...35 CRT PCB Solder Side ...

Page 38: ...36 SCHEMATIC DIAGRAM Deflection Section ...

Page 39: ...37 ...

Page 40: ...38 Video Section ...

Page 41: ...39 EXPLODED VIEW MECHANICAL PARTS LIST ...

Page 42: ...5pF D 0 5 F 1pF J 5 K 10 P 100 0 Z 80 Fig Part No Description Index R101 Resistors RE 42820J Carbon 82J R102 RD 4Z201J Carbon1 4W 200J Allowance F 1 J 5 K 10 M 20 G 2 40 INFORMATION OF PART DESCRIPTION Important Safety Notice Components identified with the International Symbol have special characteristics important for safety When replacing any components use only manufacturer s specified parts Ab...

Page 43: ...ER SP30 IS14 I 00160 5M20000001 COILTILT TC 17B B101 5PB13857 COILBEAD BI3857 AXIAL B501 5PB13857 COILBEAD BI3857 AXIAL B801 5PB13857 COILBEAD BI3857 AXIAL B802 5PB13857 COILBEAD BI3857 AXIAL B803 5PB13857 COILBEAD BI3857 AXIAL B805 5PB13857 COILBEAD BI3857 AXIAL B807 5PB13857 COILBEAD BI3857 AXIAL B808 5PB13857 COILBEAD BI3857 AXIAL C001 CL1UC3474M CLINEACROSS 0 47MF1J UCVSNDF SV Q O C009 CH1FDF4...

Page 44: ...8 10 350 CT002 9970710210 CRTGNDAS 0 12 5 24 BL102NG 660 CT801 9979300007 SOCKETCRT ISDS08S CT802 9979617022 CDT M41LJC117XX80 NH S4 C509 CCXF1H104Z CCERA 50VF0 1MFZ C510 CEXF1C102V CELECTRO 16VRSS1000MF 10X20 TP C511 CEXF1H330V CELECTRO 50VRSS33MF 6 3X11 TP C512 CMXM2A682J CMYLAR 100V6800PFJ TP C513 CEXF1H330V CELECTRO 50VRSS33MF 6 3X11 TP C514 CEXD1H100F CELECTRO 50VRND10MF 8X11 5 TP C515 CEXF1H...

Page 45: ...ICH VOSC UPC1884BCT IC502 1DBL358 IC DBL358DUALOP AMP IC503 1UPC1555C IC UPC1555C CW001 9979220075 CONNWAFER B3B EH A TILT CW002 485923272S CONNWAFER 5267 06ASTICKTYPE CW801 9979220021 CONNWAFER SMAW250 06 ANGLE CW802 9979220024 CONNWAFER SMAW250 09 ANGLE CW803 9979220022 CONNWAFER SMAW250 07 ANGLE D001 DD5SBA60 DIODEBRIDGE D5SBA60 D021 DRU1P DIODE RU1P TAPPING D022 D1N4937GP DIODE 1N4937GP TAPPIN...

Page 46: ... TAPPING R123 RD AZ393J RCARBONFILM 1 639KOHMJ R138 RD 4Z104J RCARBONFILM 1 4100KOHMJ IC601 1DBL358 IC DBL358DUALOP AMP IC801 1M52743BSP ICVIDEOPREAMP M52743BSP IC802 1LM2402T ICVIDEOOUTPUT LM2402T IC803 1DW0SD06 ICOSD MTV021 L191 5MC0000053 COILCHOKE CH 070N L501 5CPZ101K03 COILPEAKING 100UHK AXIAL7MM L801 5CPZ128K02 COILPEAKING 0 12UHK AXIAL3 5MM L802 5CPZ101K02 COILPEAKING 100UHK AXIAL3 5MM L80...

Page 47: ...LM 1 43OHMJ R405 RS02Z101J RM OXIDEFILM 2W100OHMJ TAPPING R139 RS01Z100J RM OXIDEFILM 1W10OHMJ TAPPING R141 RD 4Z224J RCARBONFILM 1 4220KOHMJ R142 RD 2Z563JS RCARBONFILM 1 256KOHMJSMALL R150 RD AZ274J RCARBONFILM 1 6270KOHMJ R151 RD 2Z124JS RCARBONFILM 1 2120KOHMJSMALL R152 RD 4Z274J RCARBONFILM 1 4270KOHMJ R154 RD AZ303J RCARBONFILM 1 630KOHMJ R156 RD AZ223J RCARBONFILM 1 622KOHMJ R157 RD AZ103J ...

Page 48: ...406 RW02Z249JN RWIREWOUND 2W2 4OHMJNON INDUCT R407 RD AZ103J RCARBONFILM 1 610KOHMJ R408 RD AZ432J RCARBONFILM 1 64 3KOHMJ R409 RD 2Z102JS RCARBONFILM 1 21 0KOHMJSMALL R410 RN AZ2002F RMETALFILM 1 620 0KOHMF R411 RN AZ3092F RMETALFILM 1 630 9KOHMF R412 RS02Z369J RM OXIDEFILM 2W3 6OHMJ TAPPING R413 RS02Z129J RM OXIDEFILM 2W1 2OHMJ TAPPING R414 RD AZ223J RCARBONFILM 1 622KOHMJ R415 RD AZ223J RCARBON...

Page 49: ... RCARBONFILM 1 6220OHMJ R881 RD AZ562J RCARBONFILM 1 65 6KOHMJ R882 RD AZ622J RCARBONFILM 1 66 2KOHMJ R883 RD AZ562J RCARBONFILM 1 65 6KOHMJ R884 RD AZ105J RCARBONFILM 1 61MOHMJ R885 RD AZ101J RCARBONFILM 1 6100OHMJ R886 RD AZ101J RCARBONFILM 1 6100OHMJ R887 HRFT332JCA RCHIP 1 103 3KOHMJ2012 R888 HRFT152JCA RCHIP 1 101 5KOHMJ2012 R889 HRFT153JCA RCHIP 1 1015KOHMJ2012 R890 HRFT472JCA RCHIP 1 104 7K...

Page 50: ...OVERSEAS SERVICE DEPT DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPOGU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC FAX 02 590 6291 TEL 02 360 7114 590 6151 5 http www dwe daewoo co kr PRINTED DATE AUGUST 1999 ...

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