歯 C:\KT-1982관련\document\SERVICE
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1. 17 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 High voltage does not develop Horizontal output circuit 5 1 1 No Raster No Video M Measure 80V output between cathode of D120 and Ground YES Does appear 80V DC Check the other secondary outputs 200V 80V 14V 14V 12V 6 3V 5V Lines NO Does each output appear D107 1C103 1C 101 Horizontal circuits 5 1 2 S Correction failure aa Check 51 52 53 54 signals refer to IC1 06 1 pin S correction table on the schematic 51 52 53 54 signal are right at each frequency block Check and replace NO Q307 309 311 313 306 308 310 312 Check and replace 18 5 1 3 Degaussing failure Check degauss Connector CN 101 YES Check output voltage at pin 12 of IC501 Normal OV Degaussing 5V Does DC voltage right YES Check and replace Q101 D101 RL101 R106 5 1 3 Purity failure NO Replace IC501 Inc Degaussing circuit G 2 TC N Refer to 5 1 2 is right YES Replace CRT and verify purity 19 5 1 4 Tilt Failure Check tilt connection CN100 IC 501 pin 35 output varies with different values DC 02. CRT Neck Board Video Connector Main Board Sync Connector Frame GND Frame GND HUSB Vec caia 2 3 TIMING CHART HORIZONTAL VERTICAL VIDEO o U C D E Q R S 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 BACK PORCH R ACTIVE TIME S FRONT PORCH IGT VESA 31 469 31 469 37 860 48 363 53 674 60 24 a E s 3 1 FRAME UR Touch Screen Main Board Socket Board PFC Board AMP Connector 3 2 MAIN PCB ASS Y 3 3 Function of Control C ie 9 ej ej O ___ Function LED Power Indicator SELECT DEG The light of power LED changes according to each state O on mode Green LED 9 power saving mode green LED blinking This button is used to select the control item on the MENU In MENU the control item could be selected and unselected by this button When you press this button the MENU appears The MENU will disappear in 10 seconds if you don t operate any button When you press MOD button again the MENU disappears This button is used to exit the value of any selected control UP This button is used to increase the value of any selected control This button is used to locate to the next control item for select This button is used to decrease the value of any selected control This button is used to locate to the previous con
3. key A C in full white pattern and adjust ACL to 28 30f front cabinet full white back raster x attention If 50f doesn t adjust in 20 window adjust G G again with DOWN key 4 3 3 color adjustment 6500K a white balance adjustment 1 Select factory mode 2 Select COLOR TEMP with UP DOWN key 3 Select 6500K 15 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 y20 313 and do the next selection with EXIT key 4 3 4 brightness uniformity adjustment set condition frequency 48KHz 60Hz 1024x768 display pattern 9ball pattern brightness MIN cut off contrast MAX Measure nine brightness display in the screen front cabinet OO O O O O O O 4 3 5 Focus adjustment set condition frequency 48KHz 60Hz 1024x768 display pattern H character brightness min cut off contrast max 1 Adjust in focus of whole screen to be the best fitted with FOCUS V R in FBT 4 3 6 PURITY adjustment Purity is that unnecessary colors appear in the screen except displayed color Don t appear unnecessary colors divided with the naked eye at a distance of 50 from CRT surface 16 set condition direction east frequency included timing chart display pattern full white brightness MIN cut off display center RED x 0 640 015 0 GREEN x 0 295 0 015 0 BLUE x 0 142 0 015
4. COLOR MONITOR KT 1982 Kor tvc fc E MANUAL CONTENTS 5 1 PRECAUTIONS ss 2 2 PRODUCT SPECIFICATION 5 3 OPERATING INSTRUCTION 8 A ADJUSTMENTS seca interdu 10 5 TROUBLE SHOOTING GUIDE 18 6 BLOCK DIAGRAM 28 7 CONNECTING DIAGRAM 29 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 3 When the chassis is operating semiconductor heat sinks are potential shock hazards 1 1 1 Servicing the high voltage volume are CRT Warnings A High Voltage volume replaced in the wrong direction may cause excessive X Ray emissions 1 Adjust in order to 26KV with signal at Anode 2 When the troubleshooting a monitor with excessively High Voltage avoid being unnecessarily close to the monitor Do not operate the monitor for longer than is necessary to locate the cause of excessive voltage 3 Excessive High Voltage can produce potentialy hazardous X Ray RADIA TION To avoid such hazards the high voltage must be above the specif
5. NO gt Check and replace R517 4 5 Volt YES All input output value Check and replace IC502 are right YES 5 1 14 No Raster Does flyback pulse at NO Check D309 D311 L t Li collector of 0302 appear and 80V Line T YES IC301 26pin Check the Pin 26 of IC301 Does NO 12Vp p pulse appear Check and replace IC301 YES Does the wave form at NO Check and replace pin 8 of T302 appear Q304 Q303 Q305 Wa Sov MaS A Chr 7 6169 ves T302 8pin Check the voltage PIN 7 of NO Check the IC302 Does 12V DC appear 12V line YES Does the wave form at NO Check and replace pin 4 of IC302 appear ag IC302 YES Check heater voltage 6 3V 24 5 1 15 No Video Check signal cable and connector YES IC802 Pin5 Pin8 Pin10 video NO Check IC201 and input are right 12V Line YES IC802 Pin21 Pin24 Pin26 NO Check and replace video output are right YES IC803 Pin5 Pin3 Pin1 NO Check IC803 and video output are right 12V 80V Line YES R G B cathode wave NO Check D805 807 and forms are right D814 D816 YES G2 voltage are right NO Check G2 CDT 580 50V socket FBT YES G1 voltage are right 45 10 YES Check and replace CRT i i 1 20 0V M 20 04s Al Chi 4 37 23 ii 7 800 B OUT Cathode wave form 25 5 1 16 Abnormal amp Invariable H size Check and replace IC301 and 12V 80V Line IC 301 Pin24 output pa
6. SEL Key 1 5V Push the UP Key 3 5V Push the DOWN Key 2 5V m Check and replace R401 R403 R405 R406 5 1 10 Dynamic Focus Failure or poor Focus UEI EET EE OIS SJ YES Try Readjusting double Focus NO Does IC301 32 pin wave form NO Check and replace ict eee IC301 YES Check the wave form at Q705 Collector Does appear parabola 2 Check and replace wave form R725 C720 a T702 wave form is right NO Check and replace T702 Ives Replace the CRT and verify focus Tek 221 IC301 32 pin 15225 5 1 11 Visible Retrace Is G2 voltage 580 50V right NQ Check G2 control voltage and FBT YES Dens OS Ne Check 80V Line and D719 C726 85Vp p exist YES we om od heck The Gt wave form exist hogs ine Tek 23 ee Prevu 1 61 2V hj Check and replace IC201 Q201 COLLECTOR G1 5 1 12 ACL Failure Input full white pattern to monitor Check the voltage at pin 2 of IC501 NO m 1 PWM WAVE FORM Check replace 10501 eck replace 1250 YES NO Q707 base input exists gt Check replace YES Q707 12V Check and replace pin 12 of the IC802 OE M 2 004s Al Chi J4 2 36 V amooo IC501 2pin PWM 1 932 Tek EA gm v 5 1 13 Micom Failure Does 5V appear Pin6 of IC501 YES pe 501 IC501 Pin8 and pin8 wave NO Check and replace form are right X501 C516 C517 YES IC501 Pin 5 is over than
7. UP or DOWN button is used to control the value of any function 5 When you press exit button the MENU disappears 4 2 1 Screen center adjustment width 352mm height 264mm signal 1024 x 768 48KHz A B lt 4 0mm C D s 4 0mm DISPLAY AREA SQUARE CORNER a Horizontal size adjustment adjustment use to H SIZE 390 3mm 211 b Vertical size adjustment adjustment use to V SIZE 292 3mm 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 A pog RET A B 2 5mm 4 2 3 Pin balance adjustment frequency all mode signal pattern cross hatch 4 2 4 Parallelogram adjustment frequency all mode signal pattern cross hatch 5mm 12 4 2 5 Side pin cushion adjustment 02 frequency all mode signal pattern cross hatch brightness MIN cut off B D2 contrast MAX C1 O C1 C20 s2 0mm D10 020 lt 2 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 Degaussing is possible in OSD adjustment menu After using this function once You must use again after at least 30minutes 4 2 8 SAVE ADJUSTMENT CONDITION amp REMOVE USER MODE 13 4 3 Color adjustment 4 3 1 color temperature X S
8. V 5V YES IC105 pin 10 11 output varies with different values DC 1 5V 7 5V YES Check and replace R COIL of the CDT NO Check and replace IC501 NO Check and replace IC105 6 1 6 Misconvergence Failure Try readjusting convergence NO Is the convergence now within spec vo Readjusting convergence YES cM YES ETE EE CEN Is the convergence now within spec Jo Change CDT and readjusting convergence 20 6 1 7 H Linearity Failure Check pin 36 of IC501 output N varies with different value Check and replace IC501 DC 0V 5V Check pin 7 8 of IC105 O NO output varies with different Check and replace IC 105 value DC 1V 6V YES kag pL EL D Check L304 output varies with different value L304 6 1 8 High Voltage Failure Does 900V p p fly back pulse appear on pin 1 of FBT NO Check and replace Q704 D708 R716 YES Q701 703 base driving pulse exist gt Check 12V Q701 703 ves NO p Check and replace Q704 YES NO Q704 gate pulse exist Check and replace D708 709 YES NO Pin 9 of IC701 pulse exist Replace IC 701 Q704 drain pulse exist 1 H 1 i i 2 00V M 4 00us Al Chl 4 7 68 V 2 00V M10 0us Al Chi J 9 20 V Q701 Q703 BASE FBT 1pin 21 5 1 9 User control Failure Check the voltage at pin 21 of IC501 Normal 5V Push the EXIT Key 0 5V Push the
9. ck for leakage current in the following manner a Plug the AC line cord directly into a 120 or 230 Volt AC outlet Do not use an isolation transformer for this test Using two clip leads connect a 1 5KQ 10Watt resistor paralleled by a 0 15Uf capacitor in serial with an exposed metal chassis part and a known earth ground such as an electrical conductor and electrical ground connected to a earth ground Use a SSVM or VOM with 1000 ohms per volt or sensitivity to measure the AC voltage drop across the resistor Connect the resistor to an exposed metal part having a return path to the chassis metal cabinet screw heads knobs shafts escutcheon etc and measure the AC voltage drop across the resistor Any reading of 5 25 volt RMS this corresponds to 3 5 milliampere AC or more is excessive and indicates a potential shock hazard Correct the shock hazard before returning the monitor to the user READING SHOULD NOT BE ABOVE 0 5mA TEST ALL UNDER EXPOSED METAL TEST SURFACES L 2 WIRE CORD ALSO TEST WITH PLUG REVERSED USING AC ADAPTER PLUG AS REQUIRED Earth ground Figure 1 1 Leakage Current Test Circuit 1 1 3 Product safety notices 1 2 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
10. e B voltage interlocks Do not apply AC power to the unit or any of its assemblies unless all solid state heat sinks are correctly installed e 6 Always connect a test instruments ground lead to the instrument chassis ground before connecting the lead always remove the instruments lead last 2 1 SPECIFICATION CDT Tube FST Dyna flat option Size 480 19 diagonal Viewable Image Size 45 70 18 Dot Pitch 0 26 Deflection Angle 90 Focusing Method Double Focusing static amp dynamic ing Auto Scanning Vertical 50 120Hz Display Area 350X262 5 A Maximum 366 2750 Position Size Pincushion Trapezoid H Vcorner Pin B Trapezoid Parallel Tilt Moire Zoom ser Control Displa PM Color Temperature Recall Manual Degauss Eng Ger F ra Esp Port Signal Input 15 pin D sub Female or Option Safety UL CSA TUV CB DHHS Safety amp EMC EMC FCC CE Power Consumption Nomal Operation 100 Watts Display color Color Temperature 9300 K 6500 K User Color Input Current at 120V Operating 1 5Amps rms Turn on 30Amps Peak Input Current at 240V Operating 0 8Amps rms Turn on 60Amps Peak Horizontal 596 Linearity Cross Pattern Jea ertical 596 Temperature Operating 0 to 40 C Storage 40 to 60 C Environment Humidity Operating 10 to 8596 Storage 5 to 95 2 2 Monitor Interface Wiring AMP 25P i Touch Screen Ke Controller
11. et 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 x specification 9300K x 0 281 0 02 y 0 311 0 02 6500K x 0 313 0 02 y 0 329 0 02 4 3 2 color adjustment 9300K a Back raster color adjustment x Set condition frequency 48KHz 60Hz 1024 x 768 display pattern back raster pattern brightness MIN cut off contrast MAX Select factory mode Select COLOR TEMP with UP DOWN key Select 9300K Adjust back raster brightness to 0 2 0 8 F L with VR701 Select B B with UP DOWN adjust y 0 311 and do the next selection with EXIT key Select R B with UP DOWN adjust y20 281 and do the next selection with EXIT key white balance ACL adjustment x Set condition frequency 48KHz 60Hz 1024 x 768 display pattern one square 20 window full white brightness MIN cut off contrast MAX 14 Select factory mode Select COLOR TEMP with UP DOWN key Select 9300K Select B G with UP DOWN adjust y 0 311 and do the next selection with EXIT key Select R G with UP DOWN adjust y20 281 and do the next selection with EXIT key 7 Select contrast icon with UP DOWN key adjust contrast to 50 60f with UP DOWN key front cabinet 2096 window pattern back raster 8 Select ACL
12. etc Parts that have special safety characteristics are identified by A on schematics and parts lists A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock fire and or other hazards Product safety is under review continuously and new instructions whenever appropriate Servicing Precautions WARNING 1 First read the Safety Precaution section of this manual if unforeseen circumstances create conflict between the servicing precautions and safety precautions always follow the safety precautions WARNING 2 A High Voltage volume replaced in the wrong direction may cause excessive X ray emissions WARNING 3 An electrolytic capacitor installed with the wrong polarity might explode 1 Servicing precautions are printed on the chassis and should be followed closely X Always unplug the units AC power cord from the AC power source before attempting to a remove or reinstall any component or assembly b disconnect PCB plugs or connectors c connect all test components in parallel with an electrolytic capacitor after servicing always check that the screws components and wiring have been correctly reinstalled Make sure that the area around the serviced part has not been damaged 4 Check the insulation between the blades of the AC plug and accessible conductive parts examples metal panels input terminals and earphone jacks Never defeat any of th
13. ied limit The nominal value of the High voltage of this Monitor is 26KV 0 3KV at zero beam current minimum brightness under a 120V AC power source The High Voltage must not under any circumstances exceed 29KV Each time a monitor requires servicing the High Voltage should be checked following the High Voltage check procedure on this manual It is recommended the reading of the voltage be recorded as a part of the service record It is important to use an accurate and reliable High Voltage meter When the High Voltage regulator is operating properly there is no possib ility of an X Ray problem 5 The CRT is especially designed to prohibit X ray emission To ensure continued X ray protection replace the CRT only with one that is the same or equivalent type as the original 6 Handle the CRT only when wearing shatterproof goggles and after completely 7 Do not lift the CRT by the neck 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 IS Inspect all protective devices such as nonmetallic control knobs insulating materials cabinet backs adjustment and compartment cover or shields isolation resistor capacitor networks mechanical insulations etc 3 To be sure that no shock hazard exists che
14. rabola level variable YES Does T303 Pin8 pulse is appear YES Check some parts around T301 are they OK YES Check and replace Q314 5 1 17 OSD failure Check CN801 YES IC801 Pin5 Pin10 wave forms are right YES When you click on the MENU botton 1C801 Pin13 Pin14 Pin15 Pin12 wave forms are right YES When you click on the MENU botton IC501 Pin7 Pin8 wave forms are right YES Check and replace IC802 Check IC501 and SDA SCL Line NO NO Check and replace T303 M 00ms Chi 4 2 11V we eee i 7 800 IC301 24pin Y Li 1 NO Check and replace Q801 Q802 NO Check and replace IC801 5V Line madoms Al Chi 7 2 10 V 7 800 V FLY M iO 0us A Chi 4 2 20V 7 800 H FLY Ch ovo o 26 5 1 18 V deflection failure Does 14V DC appear at Pin2 of IC201 NO Refer to No power supply Does 14V DC appear at Pin5 of IC201 YES IC 301 Pin 13 Pin 23 NO Check and replace IC301 output exist YES IC 501 Pin 33 output NO exist Check and replace IC501 YES Check and replace IC2017 Sa 5 ia soomv __ A Ch F 320mV 107 800 7 800 IC201 6 pin IC201 1 pin 27 f N LED CONTROL 1 0 CONTROLL A y H SWITCHING gt aoe INLET I 651265 swrrc
15. trol item for select 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 3 Signal Analog 0 714Vp p positive at 750 internal termination 4 High Voltage Adjustment Signal without signal Adjustment 26KV 0 3KV PROCEDURE Disconnect the AC line cord from the power source Y Connect positive end of High Voltage probe to anode cap of CRT negative end of to GND main chassis G First of all Disconnect AC cord and than disconnect High voltage probe 5 Screen Voltage signal 1024 x 768 48KHz Full white Bright max Contrast max Adjustment SAMSUNG SDI 580 10V 4 1 2 TURN ON THE FACTORY OSD MANUAL METHOD 1 press on the UP key 2 connect the AC line cord from the power source 3 At this time OSD menu changed factory mode 0 Cl Z7 ac ES Esso vr BOOKA Sa lt gt BRIGHTNESS 31 4KHz 10 4 2 Display Control Adjustment Click on the MENU button OSD MENU This menu is user s OSD manual user s manual 209 28 00 1 07 JUDO A 5 BRIGHTNESS 31 4K Hz 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
16. uiNG GML __ 1 eli so R A Ao EN gt 6 LINE CBE p bU J FILTER Y CIRCUIT 7 IsurpriY rawn S fr ZEN SUPPLY 80V i y 2 FEEDBACK P 220V CDEGAUSSING LCONTROL EC lic o VERTICAL NEN p AUF OUTPUT 7 MICRO KA2142 Y A WI CPP ER H V SYNC gt Horizont Lv ____ lone gt OUTPUT 91971 TRANS lADJUS 62 1 STAGE FOCUS T P 4 BRAHEA DEFLECTION CIRCU Cor gt eee Nf MEM HV SUE HN POSI S PIN 1 PUPA HIGH VOLTAGE J HIGH VOLTAGE OUTPUT STAGE PIN BAL PROTECTION CIRCUIT ACL TILT DEG y VOLTAGE REGULATION 1 28 o E gt s s s PPP PP 1 1 1 15P D SUB emmmy CABLE 1 2 Aa H FOCUS HI VOLTAG cel 6 CN902 CN901 SOCKET PCB DEGAUSSING COIL 29 PFC Board
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