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※Parts list of KT-1903NA(UR) different from KT-1903NA(ST)

DESCRIPTION SPECIFICATION LOCATION

NO.

JUMPER, WIRE

7mm

C318

RESISTOR, CARBON

1/6W 330 J

R210

RESISTOR, CARBON

1/4W 130K F

R454

COIL, MAIN TRANS

KTV-4042A,19NA5(53V)

T101

CAPACITOR, AC EPOXY

250VAC 102pF, K

Rear attachment of IC101

CAPACITOR, AC EPOXY

250VAC 471pF, K

C103, C104

POSISTOR PDGS69R0NSK

PH101

IC, C-MOS

HD74LS86P

IC201

RESISTOR, CARBON

1/6W 10K F

R113 (ZENER DIODE R113)

RESISTOR, METAL

1W 2.2 J

R510

POWER SAVING PCB

R126

RESISTOR, CARBON

1/6W 75 F

R901, R902, R903

RESISTOR, CARBON

1/6W 39K F

R911

CAPACITOR, CERAMIC

50V 331pF SL "J"

C929, C930, C935

RESISTOR, CARBON

1/6W 560K J

R924

RESISTOR, CEMENT

7W 1.2K F

R928, R930, R937

WAFER LW-0640-06

CN901

SILICON GREASE

YG6111

HARNESS, 12PIN COLOR

650 mm

CN205

JUMP, WIRE

7.5mm

J950, J950, J950

PCB CEM-1

(90X72mm)

PCB CEM-1

23*32

TR IRF9630

RESISTOR - CARBON

1/6W 1K J

RESISTOR - CARBON

1/6W 3.3K J

RESISTOR - METAL

2W 7.5 J

LEAD - WIRE

90mm

WAFER LW0640-03

CN2

WAFER FA0640-07

CN1

JUMPER, WIRE

7mm

C318

RESISTOR, CARBON

1/6W 330 J

R210

KORTEK Corporation

KT-1903NA (UR)

Содержание KT-1403NA

Страница 1: ...SERVICE MANUAL COLOR CRT MONITOR KT 1903NA KT 1703NA KT 1403NA KORTEK CORPORATION DOC NO KT XX03NA SM DATE 2004 02 02 REV NO 0 REV DATE...

Страница 2: ...CAUTIONS 3 2 PRODUCT SPECIFICATIONS 6 3 OPERATING INSTRUCTIONS 10 4 ADJUSTMENT 10 5 BLOCK DIAGRAM 12 6 GENERAL THEORY OF OPERATION 13 7 TROUBLE SHOOTING GUIDE 26 8 WAVE FORM 33 9 BILL OF MATERIAL 36 1...

Страница 3: ...ated or melted wire is found then please do not try to replace the related parts and wait for the qualified service person s coming 2 Many electrical mechanical parts in this monitor have special safe...

Страница 4: ...he high voltage The high voltage meter should indicate the following factory recommended level 4 If the actual level exceeds the max factory set level then immediate service is required to prevent the...

Страница 5: ...all any component or assembly disconnect PCB plugs or connectors connect all test Components in parallel which an electrolytic capacitor 3 After servicing always check that the screw components and wi...

Страница 6: ...R TERMINATIONS RASTER DIM ADJUST RANGE VERTICAL 190 290 mm RASTER DIM ADJUST RANGE HORIZONTAL 300 350 mm MODE 640 480 PINCUSHION ALL BRIGHTNESS 3 0 MIS CONVERGENCE CENTER 0 25 0 3 mm MIS CONVERGENCE C...

Страница 7: ...7 2 2 PCB DIMENSIONS 1 MAIN PCB KT XX03NA KORTEK Corporation...

Страница 8: ...n P_NO PIN_NAME P_NO PIN_NAME 1 RED VIDEO 9 NC 2 GREEN VIDEO 10 SHIELD GND 3 BLUE VIDEO 11 SHIELD GND 4 NC 12 NC 5 NC 13 H SYNC 6 RED GND 14 V SYNC 7 GREEN GND 15 NC 8 BLUE GND 2 2 1 15 PIN SIGNAL CAB...

Страница 9: ...NEGA FREQUENCY 31 469 31 469 31 469 31 469 PERIOD 31 777 31 777 31 777 31 777 SYNC 3 813 3 813 3 813 3 813 B P 1 907 1 094 1 907 1 907 H ACTIVE 25 422 25 422 25 422 25 422 FREQUENCY 59 941 70 087 70...

Страница 10: ...tor to the 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...

Страница 11: ...ON ADJUST TO CENTER THE PATTERN WITHIN THE RASTER V R501 E SELECT S PCC FUNCTION ADJUST SIDE PINCUSHION ON THE EDGE V R405 F Remove H SYNC to make H SYNC flow and vary V R301 to adjust frequency at 31...

Страница 12: ...AM R G B H V VIDEO PRE AMP KA2141 VIDEO DRIVE SIGNAL CONTROL 74LS86 VERTICALOUT TDA8172 AUTO BIAS H V PROCESS TDA9102C 54V 125V 12V 6 3V 26V POWER SUPPLY FBT S CORRECTION SCREEN FOCUS H V KORTEK Corpo...

Страница 13: ...of the complete monitor This will help when covering the sections individually The process from video signal to video display starts with the video signal generated from the source The signal is compo...

Страница 14: ...ase The amplitude of Q903 is determined by emitter resistor R938 and collector resistor R937 and R945 Circuit of L903 and C935 are configured for prevention from and compensation of loss of high frequ...

Страница 15: ...voltage to maintain screen brightness at a constant level 6 5 AUTO BIAS CIRCUIT SECTION Auto bias circuit automatically controls BIAS voltage by detecting the separation between cathode of CRT and gr...

Страница 16: ...n the form of wave signal on Q953 collector and sent to IC950 to be amplified IC950 amplifies the signal at rate of R956 R957 and R955 and sends it to IC950 Pin 3 for the second amplification Second a...

Страница 17: ...01 and converted to ripple voltage and converted to DC through the operation of C105 Switching circuit is made up of IC101 peripheral circuits and IC101 performs control and switching operations such...

Страница 18: ...f 125V D116 C116 J175 and R116 circuit Pin 10 and Pin 14 are GNG on the secondary voltage Pin 11 supplies voltage to CRT heater in 6 3V line and its circuit is composed of D111 C123 and R123 Pin 12 su...

Страница 19: ...ed OSC outputs vertical and horizontal frequency in free running and even though SYNC is not supplied from outside it can operate IC301 supplies 12V voltage to Pin 20 to drive it With Pin 1 and Pin 2...

Страница 20: ...controls H phase by adding or subtracting it with DC voltage and its circuit is composed of C308 R310 R309 and VR305 Pin 11 is used as GND of IC301 Pin 12 and Pin 18 terminal controlling vertical fre...

Страница 21: ...rcuit is composed of chip embedding four exclusive or gate circuits Pin 14 is a terminal supplying Vcc for driving chip Pin 1 2 4 5 9 10 12 and 13 are SYNC input terminals Pin 3 6 8 and 11 are output...

Страница 22: ...n chip and supplies it to reflection yoke The outputting terminal is composed of C505 C511 and R508 R507 Pin 2 is a terminal supplying reference voltage Pin 3 is pulse generator and Pin4 is used as GN...

Страница 23: ...pulse and the operation can drive FBT C402 and C403 generates pulse and supplies it to horizontal deflection and 900V 1000V Vcp voltage is applied to T402 Pin 1 and this voltage varies with voltage s...

Страница 24: ...3 HIGH VOLTAGE adjustment method 1 Measuring terminal CRT ANODE 2 Adjusting voltage 23 4 Kv 300 V 3 Measuring condition CROSS HATCH PATTERN Screen size at the full scan horizontal frequency 31 5 Khz...

Страница 25: ...F L The difference of X y value should be within MIN 15 MAX 35 7 Other V R Adjustment 1 Measuring condition BS 120 CROSS HATCH PATTERN 31 5 Khz 640X480 MODE 2 Measuring method H SIZE MIN below 320 MA...

Страница 26: ...H AN GE D 1 0 1 N G O K O K C H E C K IC 1 0 1 C H E C K C H AN GE D 1 0 2 N G O K O K C H E C K Z D1 0 3 C H AN GE Z D1 0 3 N G O K O K C H E C K B 1 2 0 V C H E C K T 1 0 1 N G O K O K C H E C K C...

Страница 27: ...ABLE NG O K O K CHECK IC901 CHANGE IC901 NG O K O K CHECK 12V CHECK CHANGE D 112 NG OK O K CHECK Q901 2 3 CHANGE Q901 2 3 NG O K O K CHECK CATHODE CHECK S G501 2 3 NG O K O K CHECK COMPONENT CHANG IC9...

Страница 28: ...CHANGE IC201 NG O K O K CHECK D 201 2 CHANGE D 201 2 NG O K O K CHECK IC301 CHECK CHANGE C308 R315 NG O K O K CHECK IC501 CHANGE IC501 NG O K O K CHECK Z D201 2 CHANGE Z D201 2 NG O K O K END CHECK C...

Страница 29: ...VERTICAL DEFLECTION PROBLEM CHANGE D501 NG OK OK CHECK IC501 CHANGE IC501 NG OK OK CHECK 24V CHECK CHANGE D110 NG OK OK CHECK R510 CHANGE R510 NG OK OK CHECK DY CABLE CHANGE CDT NG OK OK END CHECK CH...

Страница 30: ...EFL ECT ION P ROBLEM CHANGE IC301 NG O K O K CHECK Q 401 CHANGE Q 401 NG O K O K CHECK D RIVE CHECK CHANGE R402 R455 NG O K O K CHECK F BT CHANGE F BT NG O K O K CHECK D Y CABLE CHANGE CDT NG O K O K...

Страница 31: ...LEM CHECK IC202 X RAY PROTECTION PROBLEM CHANGE IC202 NG OK OK CHECK C303 CHANGE C303 NG OK OK CHECK R324 OK CHECK D301 CHANGE D301 NG OK OK CHECK FBT CHANGE FBT NG OK OK END CHECK CHANGE R324 NG OK K...

Страница 32: ...BIAS PROBLEM CHANGE IC902 NG OK OK CHECK SG950 CHANGE SG950 NG OK OK CHECK DRIVE CHECK CHANGE Q901 2 3 NG OK OK CHECK Q503 CHANGE Q503 NG OK OK CHECK Q950 1 2 CHANGE Q950 1 2 NG OK OK END CHECK CHANGE...

Страница 33: ...33 8 1 IC101 0880 PIN 1 OUTPUT WAVEFORM 2 IC101 0880 PIN 5 INPUT WAVEFORM 3 H SYNC WAVE FORM 4 V SYNC WAVEFORM 5 CLAMP WAVEFORM 6 VIDEO IN PUT WAVEFORM KORTEK Corporation KT 1903NA...

Страница 34: ...7 IC301 PIN 15 OUT PUT WAVEFORM 8 IC501 PIN 5 OUT PUT WAVEFORM 9 IC301 PIN 8 FLY BACK IN PUT WAVEFORM 10DYNAMIC FOCUS WAVEFORM 11 Q402 OUTPUT WAVEFORM 12 Q402 BASE WAVEFORM KORTEK Corporation KT 1903...

Страница 35: ...35 13 D403 WAVEFORM 14 D404 WAVEFORM 15 VIDEO IN PUT WAVEFORM 16 VIDEO_PREAMP OUT WAVW FORM FULL WHITE 17 VIDEO CATHODE OUT WAVE FORM 18 IC301_8P WAVE FORM KORTEK Corporation KT 1903NA...

Страница 36: ...JUMP WIRE 7 mm J906 J923 J926 8 JUMP WIRE 6 mm J903 J904 J907 J909 J901 9 JUMP WIRE 5 mm J902 10 JUMP WIRE 20 mm J126 11 JUMP WIRE 15 mm J101 J119 J123 J124 J125 J140 J144 J147 J173 12 JUMP WIRE 15 mm...

Страница 37: ...TIC 35 V 220 uF KME KMG C504 38 CAPACITOR ELECTROLYTIC 35 V 1000uF KME KMG C122 C503 C119 39 CAPACITOR ELECTROLYTIC 35 V 2200uF KME KMG C507 40 CAPACITOR ELECTROLYTIC 50 V 0 47uF KME KMG C471 41 CAPAC...

Страница 38: ...0 66 CAPACITOR MPP 250 V 824pF J C404 67 CAPACITOR MPP 250V 504pF J C712 68 CAPACITOR MYLAR 100 V 102pF J C316 C319 C405 69 CAPACITOR MYLAR 100 V 103pF J C312 C315 C502 Q202 C708 C920 70 CAPACITOR MYL...

Страница 39: ...D112 99 DIODE RG4C D108 D109 D116 100 DIODE UF5404 D402 101 DIODE DD84 D401 102 DIODE 1N4148 ZD101 103 DIODE 1N4002 D705 104 DIODE 1N4148 D701 105 DIODE 1N4148 D901 D902 D903 D904 D908 D909 D910 106...

Страница 40: ...00 30mm Q102 129 IC TDA9102C IC301 130 IC KA358A OP AMP IC401 131 IC TLP721 D4 GB IC102 132 IC KA2S0880 800V 8A IC101 133 IC 74LS86 TTL IC201 134 IC TDA8172 VERTICAL IC501 135 IC MC14538BCP IC202 136...

Страница 41: ...OR CARBON 1 4W 2 2K J R118 R415 R432 165 RESISTOR CARBON 1 4W 2 4K J R419 166 RESISTOR CARBON 1 4W 3 6K J R409 167 RESISTOR CARBON 1 4W 4 7K J R207 R430 168 RESISTOR CARBON 1 4W 6 2K J R319 R431 169 R...

Страница 42: ...6W 100 J R111 197 RESISTOR CARBON 1 6W 220 J R455 198 RESISTOR CARBON 1 6W 330 J R210 199 RESISTOR CARBON 1 6W 390 J R204 J104 200 RESISTOR CARBON 1 6W 1K J R110 201 RESISTOR CARBON 1 6W 5 6K J R472...

Страница 43: ...ISTOR CARBON 1 6W 3 3K J R925 231 RESISTOR CARBON 1 6W 9 1K J R920 232 RESISTOR CARBON 1 6W 27K J R908 233 RESISTOR CARBON 1 6W 100K J R926 234 RESISTOR CARBON 1 6W 270K J R935 235 RESISTOR CARBON 1 6...

Страница 44: ...J R123 262 RESISTOR METAL 2W 12 J R126 263 RESISTOR METAL 2W 1K J R429 264 RESISTOR METAL 2W 22K J R119 265 RESISTOR METAL 2W 68K J R108 266 RESISTOR VARIABLE 500B RVM630H VR101 267 RESISTOR VARIABLE...

Страница 45: ...Q408 295 TRANSISTOR BU2520DF Q402 296 TRANSISTOR C2316 Q401 297 TRANSISTOR C3198 Q201 Q303 Q405 298 TRANSISTOR C3203 Q403 Q501 299 TRANSISTOR C3206 Q103 300 TRANSISTOR C3503 Q406 Q407 301 TRANSISTOR...

Страница 46: ...46 NO DESCRIPTION SPECIFICATION LOCATION NO 314 WAFER FA 0640 08 CN950 CN950 CN950 315 WIRE LEAD BLACK 40mm 1007 24 ZD201 C422 KORTEK Corporation KT 1903NA...

Страница 47: ...11 POWER SAVING PCB POWER SAVING PCB R126 12 RESISTOR CARBON 1 6W 75 F R901 R902 R903 13 RESISTOR CARBON 1 6W 39K F R911 14 CAPACITOR CERAMIC 50V 331pF SL J C929 C930 C935 15 RESISTOR CARBON 1 6W 560K...

Страница 48: ...SISTOR CARBON 1 6W 680 J R455 12 RESISTOR CARBON 1 6W 2 2K J R114 13 RESISTOR CARBON 1 6W 5 6K J R472 14 RESISTOR CARBON 1 6W 10K J R111 15 RESISTOR CARBON 1 6W 33K J R112 16 RESISTOR CARBON 1 4W 15 J...

Страница 49: ...CAPACITOR P P 1 6KV 752pF J C402 45 COIL HDT KTV 2218A T401 46 COIL LINEARITY 17N 19 5T YELLOW DOT L402 47 COIL MAIN TRANS KTV 4042A 17NA T101 48 DIODE RECTIFIER RG4C 600V 1A D109 49 DIODE ZENER 6 2V...

Страница 50: ...SISTOR CARBON 1 4W 270K J R935 75 RESISTOR CARBON 1 6W 100 F R938 76 F B T KFS 61619 T402 77 SILICONE PAD RUBBER 20 24 0 45t KSD 5072 IC101 78 SCREW TAPPING TP3 8mm 2 CUT 79 SCREW TAPPING TP3 12mm 2 C...

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