KT-1948 SERVICE MANUAL
Contents
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3. Further it extends the life time by compensating the emission loss when CRT is used for long time and CRT can be replaced without additional adjustment when A S The description of circuits is as follows PIN4 of SUB PCB is connected with the cathode of CRT CRT CATHODE is composed of 3 electrodes R G B and GRID1 is also composed of 3 electrodes The electrodes maintain spaces different from each other and BIAS voltage should supply voltages proportional to these spaces to acquire even color Since the principle of the circuit operation is identical for R G and B RED circuit will be described as an example CRT CATHODE emits hot electrons when the voltage is supplied to the heater of CRT and the temperature of the surface of adjacent CRT cathode reaches 900 over Then the hot electron moves toward CRT FACE though there are some differences according to the conditions of voltage applied to GRID1 GRID2 GRID3 5 and the current is produced toward opposite way which shows up at CRT RED cathode SUB PCB PIN4 is connected with RED cathode passes through R962 and the changes in current and voltage occurs at the emitter of Q953 This changed current is displayed in the waveform and is sent to IC950 to amplify since it is very poor signal IC950 amplifies in R956 R957 R955 ratio and sends the signal to PIN3 of IC950 for secondary amplification The secondary amplification of IC950 is performe
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5. HORIZONTAL DRIVE INPUT and C417 performs noise filter function Horizontal drive pulse is applied to the gate of Q402 via C407 and D406 and R407 form BIAS circuit 12V is supplied to T402 and PIN7 of T402 generates pulse from switching Q402 The generated pulse is exposed to PIN4 1 of T402 and is supplied to horizontal output TR R401 is resistor for current regulation C406 is the circuit for input current restraint and noise elimination 5 HORIZONTAL amp VERTICAL OSC HORIZONTAL amp VERTICAL OSC 5 CONTROL V BLN CONTROL E M1 4G 100V gt R330 39K F EWTRP 9 R341 39K F R347 0327 172 27K M473 L C323 M222 C312 JE MW 100V R327 1 9K F R311 22K F 5 5 HBUF A HPLL GNDS EWPAR VSCOR o VSYNC BDRV j HORV EWORV VOUT2 S Vourt a BIN O HSYNC VSYNC C324 M102 325 470uF KM 8 5 4 6 7 B O VOUTI C 16V v 2 O HSIZE CONTROL 2N3906 C321 101pF NPO FBT PULSE CONTROL 12V IC301 TDA4858 is in charge of horizontal amp vertical OSC and drive and is activated by 12V of PINY Vertical oscillator is composed of PIN22 23 24 C306 R306 and C305 PIN28 controls V BLN PIN18 V SIZE and PIN17 V POSI Vertical drive output is performed by PIN12 and
6. SERVICE MANUAL BUYER REV MODEL NAME KT 1948 DATE JANUARY 2003 KORTEK CORPORATION CONTENTS 1 PRECAUTIONS PETERE A2 2 SOCKET PCB CIRCUIT DESCRIPTION 5 3 MAIN PCB feme 9 4 PART LIST 5255550 AD 5 SPECIFICATION 7729 6 TIMMINIG CHART 24 7 WAVE FORMS KERTEK 23 8 TROUBLE SHOOTING GUIDE 25504 721 9 BLOCK DIAGRAM 10 MAIN PCB MARKING PETTER 29 11 SOCKET PCB TOP MARKING meme 90 12 SCHMATICS TUS 221 KORTEK Corporation KT 1948 1 PRECAUTIONS 1 1 SAFETY PRECAUTIONS WARNINGS Service should not be attempted by anyone unfamiliar with the necessary precautions on this monitor The following precautions are necessary during servicing 1 For continued safety do not attempt to modify the circuit board 2 Disconnect the AC Power before servicing 3 When the Monitor is operating do not touch any heatsink on the Chassis as it is self heated FIRE amp SHOCK HARZARD 1 During servicing pay attention to the original wires whether it is uncoated or undressed especially the wires in the high voltage circuit section If there is any uncoated 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 safety related characteristics for protection against shock hazard and others These char
7. 6 Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s ground lead last Circuit Description 1 SOCKET PCB Circuit Description 1 VIDEO PRE AMP VIDEO PRE AMP 1 901 C902 18UF 50v 5927 RN C908 R939 T 102 390 F u 8 8 ovo ono coo 7 18UF i NV C912 1 3 1 3 50V 1 3 50V m 10UF R903 co G OUTPUT gt B OUTPUT C917 188UF 25V 12V m m BLK Video signal 0 7V PP supplied from CN901 PIN2 BLUE 4 GREEN 6 RED is supplied to IC901 6 8 via C902 C903 C905 901 performs VIDEO PRE AMP function the amplitude is determined by DCBIAS of PIN 1 2 3 and OUT PUT VIDEO LEVEL is determined by PIN9 CONTRAST DCBIAS and contrast controlled VIDEO SIGNAL are output to PIN 19 RED PIN 17 GREEN PIN 13 BLUE and supplied to VIDEO OUT PUT CIRCUIT For detailed information please refer to KA2141 DATE BOOK 2 VIDEO OUT PUT AMP VIDEO OUTPUT AMP The SIGNAL supplied by VIDEO PRE AMP is input to the base of 0903 The amplitude of 0903 is determined by
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9. 13 PIN14 and PIN15 are V H SYNC input terminals and are always supplied in negative value Horizontal oscillator is composed of PIN27 28 29 C302 R303 and R304 C303 R305 and C304 connected to PIN26 perform AFC function PIN2 of IC301 performs X RAY CONTROL function and the circuit is composed of F B T PULSE D301 C311 R313 R312 and C307 PIN5 and its peripheral circuits detect and compare F B T PULSE and output the pulse to PIN6 for constant high voltage at anytime VR301 is high voltage control VR and since its high voltage is adjusted to 24 5KV at the manufacturing process there is no need to adjust when performing A S PIN11 of IC301 and its peripheral circuits control H SIZE The voltage proportional to the changing value of DC voltage and high voltage of PIN32 is output to PIN11 and controls Q408 and Q410 to control H SIZE Moreover S PIN and V BLN are composed at PIN11 and is adjusted by Q408 and Q410 6 HORIZONTAL OUT PUT CIRCUIT HORIZONTAL OUTPUT CIRCUIT T401 KFS 61687 0401 3 56 FMQGSFMS HORIZONTAL DRIVE INPUT SDS 40U60S 3 C402 L114 2 151uH 14 20 24 0411 10 uF 0408 C1008 50V F4005 jc T501 FT 1948 Tae 1KV 102pF HORIZONTAL OUT PUT CIRCUIT is composed of OUT PUT TR 0401 FLY BACK TRANSFORMER T401 Q403 and VR401 Q411 Q412 which are RASTER POSITION ADJUST CIRCUIT T501 and its peripheral circuits connected to
10. PIN14 of T401 are forming DYNAMIC FOCUS circuit HORIZONTAL DRIVE PULSE is supplied to the base of Q401 and pulse is generated at resonant circuit which is composed of T401 HORIZONTAL DEFLECTION YOKE C401 and C402 PIN2 of T401 is supplied with controlled voltage from Q403 The voltage is supplied in varied values depending on the frequency It is as follows 31 5KHz 54 38KHz 65V 48KHz 85V Pulse of 800 900V value is generated at PIN1 of T401 and the high voltage is supplied to the anode of CRT after boosting the value to 24 5KV Moreover T401 supplies FOCUS SCREEN voltage to CRT VR401 is horizontal raster position control VR and is supplied 10V from T401 PING 10V PIN4 respectively and change DC voltage to Q411 and Q412 to move the horizontal raster to the left or right 7 VERTICAL OUT PUT CIRCUIT VERTICAL OUTPUT CIRCUIT IC302 TDA4866 is VERTICAL OUT OUTPUT CIRCUIT It is the circuit Which generates sawtooth wave form needed for deflection and supply to deflection yoke The waveform supplied to DRIVE e 1 2 is boosted and output to PIN6 1 R33 R336 csse EU 12V is supplied to PIN3 of IC302 SEL RED aay and 40V is supplied to V_IN R315 C337 5 2 5 8 o S rus p VERTICAL DEFLECTION COIL R334 and R335 are 1 grade FEED BACK resistors used for circuit accu
11. 1948 15 0120 31676 H101 40M 0125 31676 6121 63V 470uf 1111 L110 F touh 8 15 49V IT CN102 D COIL R103 5W 68K 0122 UF4007GI 632V 123 C107 332uH O 110V I C124 BOV 47uF 160V 1uF KMG 1KV 221pF C105 d 400V 330uFT 0113 0121 UF4 07 UF4007 R101 1 4W 560K R102 NAN 120K 0191 ctet C103 PBLAOB 3 154 25 VAC 224pF 494 25 102pF Xa Bip 12828 1 0193 R104 AC95V Xe C102 M rian 260 DE 5 224p UF4007 1 28 18 J UF4007 O 40 v 100V 22 1 KNG cies AC IN PUT 25 102pF 102 CN101 8013 ip ATUM T O H 127 0125 1 R111 KA3842B UFS404 126 2200uF 722 16 C114 M472 cun Y at L113 1 2 4 CN104 R112 100 J PDGS69RO 0106 1N4148 R109 1 44 62K 1 0105 184148 C115 M104 RL101 R113 116 511 55 22K 685 4TipF cito 102pF 250AC O SYNC PULSE INPUT Power supply is composed of line filter switching amp and switching trans circuit line filter circuit eliminates the noise of the power line su
12. 25 42205 22 222US US H 1 90705 1 90705 1 90705 3 55605 H BP SW 3 813US 3 813US 3 81305 2 00005 3 20005 2 09205 POL POSITIVI POSITI NEGATI POSITIVI POSITIVI NRGATIVI V PREQ 59 940 50 00 59 940 56 250 0 60 317 0 60 004S V DISPLAY 15 253mS 15 253mS 15 253mS 17 067mS 15 840mS 15 880mS 29 21 Tek Prevu A 7 00mV 7 00mV WAVEFORMS revu A 47 5 47 3mV AD 26 5mV 4 26 5mV 1 1 140mV LMteaus chi 7 4 76mV 9 50mV Pus 1 M10 0us A Chi S 23 2mV T EE 1 10 0 5 i f 17 6 010 P pv 84000gs ij 3 30000 5 t 097 6 200045 VIDEO INPUT CLAMP SIGNAL VIDEO DRIVE OUTPUT Tek 37 E pu 240 TMIO0us A Chl 1 04 1370000005 VIDEO OUTPUT Tek 23 A 218mV 215mV die 43 6mV 7 20 M4 00ms A hi mam 7 80mV 1 CrTM O0usA Chi f 32 9mv 4 L i 7 07 0 0005 F T AUTO BIAS PULSE INPUT idpv 15 8000gs AUTO BIAS PULSE OUTPUT Tek Prevu Tek Prevu 249mV 204 249mV a A M4 00ms A Chi 1 ii
13. EMI TTER RESI STOR R938 and COLLECTOR RESISTOR R937 R945 and L903 C935 circuits are composed for frequency loss prevention and compensation VIDEO OUT PUT AMP is composed of 3 circuits dirette R G B the explanation above is about qm RED and since LOCATION NO for the components are applied differently please refer to complete circuit for GREEN and BLUE circuits For A S or value changes for the components please understand the characteristics of the components thoroughly and apply appropriately R938 and R937 are for 1 temperature compensation and R945 is for 5 grade temperature compensation for TR Q903 and NPO type capacitor must be used for C935 3 62 CONTROL CI RCUIT 62 CONTROL CIRCUIT is used to ompl ement the movement of AUTO BIAS circuit and there is no need to adj ust C2 CONTROL CIRCUIT SCREEN voltage even when replacing CRT The circuit works as follows When R G B CATHODE voltage of CRT detected through R936 R931 R933 is applied to the base of 0904 0904 automatically controls screen voltage and maintains the luminosity of the screen evenl y 4 AUTO BIAS CIRCUIT AUTO BIAS CIRCUIT 5 AUTO CIRCUIT is the circuit which detects the space between the cathod of CRT and GRID 1 and automatically adjusts BIAS 2904 voltage R955 1 It compensates the color T BSD 201L changes when warming up and maintains evenly
14. acteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement component rated for higher voltage wattage etd Replacement parts which have these special characteristics are identified in the manual and supplements by shading on the schematic diagram and the parts list 3 When replacing Chassis always be certain that all the protective devices are installed properly 4 leakage current check figurel 1 KORTEK Corporation KT 1948 READING SHOULD NOT BE ABOVE 0 45mA DEVICE UNDER TEST TEST ALL EXPOSED METAL SURFACES LEAKAGE CURRENT TESTER ALSO TEST WITH PLUG REVERSED USING AC ADAPTER PLUG AS EARTH REQUIRED GROUND TEST METHODE 1 1 2 X RADIATION WARNING The only potential source of x radiation is the picture tube however when the high voltage Circuitry is operating properly there is no possibility of an x radiation problem The basic precaution is to keep the high voltage at the factory recommended level 1 To measure the high voltage use a high impedance high voltage meter Connect to chassis and to the CRT anode cap 2 Turn the contrast control max clockwise 3 Measure the 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 possibility of premature fa
15. circuit supplying voltage to VIDEO OUT PUT AMP through 110V line and the circuit is composed of D121 C123 L111 and C124 PIN10 is the circuit supplying to VERTICAL OUT PUT with 40 line and is composed of D122 and C125 PIN11 is the circuit supplying activation voltage to HORIZONTAL amp VERTICAL OSC IC with 12V line and is composed of D123 C126 L112 C127 and C132 PIN12 is supplying voltage to CRT heater through 6 3V line and the circuit is composed of D124 C128 L113 R116 and C129 As other circuits for power supply auto and manual degaussing circuits are composed of PH101 and RL101 2 HORIZONTAL amp VERTICAL MODE CONTROL CIRCUIT HORIZONTAL amp VERTICAL MODE CONTROL 12V IC801 WT8045N245 VDD e AX768 56 5k 1K R601 eG in JUMPER 1024X768 ND D601 R610 H POSI 1024X768 4 184148 62K CONTROL R441 82K je m 800X600 37 5K H SIZE 47K CONTROL 5 2 640x480 640x400 D603 1N4148 PINcUSHIONO V SIZE CONTROL CONTROL 601 is in charge of horizontal amp vertical sync and mode control checks SYNC input through PIN3 4 then output through PIN5 6 and regardless of input SYNC output SYNC is always output in negative value PIN1 2 forms oscillator circuit of IC601 and is composed of C601 C602 X601 and R603 PIN15 PIN23 output low signal from correspo
16. d M P ____ 80 00005 ERN P 240 000us AUTO BIAS PULSE H V BLANKING INPUT G1 PULSE 29 22 WAVEFORMS Tek Prevu Tek Prevu A 465 465mV r M MMMMM1 1 40 8mV L i 08 40 4mV 1 80 93 0mV 7 4 00 5 Chi J 257mV 1M4 00ms A Chi 37 7mVj Chi 4 86V 1 0970 000005 80 000015 o H DEFLECTION PULSE V DEFLECTION PULSE V DRIVE PULSE Tek Prevu Tek Prevu i 3 U 463mV M 200 463mV 4 Tek Prevu 1 89 51 89 9mV A 48 01 48 omv A 60mV Chi 25 30 1 v 3 80000ys i 1 i 7 200005 ERAT SALE SYNC OUTPUT B CONTROL PULSE 121mV i 3 i 136 SI 242mV Maooms A Chr S 97nsmv 9 274 Chl 98 1m 112V M4 00ms A Chi 1 400 n dnd 2 027 0 000005 11 gt 72 720005 H SIZE CONTROL PULSE F B T FEED BACK PULSE DYNAMIC FOCUS PULSE 29 23 KT 1948 BLOCK DIAGRAM
17. d in R952 R964 ratio and the pulse is transformed into DC LEVEL by ZD950 and C952 Transformed DC voltage controls Q951 0952 0950 and is sent to SUB PCB to control the base of Q953 When the base voltage of Q953 changes the voltage of emitter changes and controls the amount of hot electrons of CRT cathode The operation forms FEED BACK LOOP and maintains fixed value through repetition 5 PULSE GENERATOR PULSE GENERATOR vi 1N4148 1c902 1 2 R924 IC902 1 2 919 220PF 50V C920 1 3 50 HORIZONTAL amp cats VERTICAL 220PF 50V BLANK PULSE INPUT 77 PULSE GENERATOR CIRCUIT supplies power to the control of AUTO BIAS circuit and produces and supplies pulse only while blanking period to prevent error For more detailed TIMING CHART please refer to the waveform of the circuit diagram The description of the circuit is as follows HORIZONTAL amp VERTICAL BLANK PULSE is supplied through R917 adjusts the waveform delay and width to ease AUTO BIAS movement at PULSE OSCILLATOR circuit composed of IC902 C920 R921 R923 R924 R922 and output to PIN 7 of 902 Since the output waveform can not have enough current the waveform is output to after amplifying the current using OP AMP and supplies the current to AUTO BIAS CONTROL CIRCUIT 2 MAIN PCB Circuit Description 1 POWER SUPPLY R120 POWER SUPPLY 101 KT
18. ilure of components 5 To prevent X RADIATION possibility it is essential to use the specified picture tube 6 The nominal high voltage is 24KV and not exceed 27KV at zero beam current at rated voltage 32 3 KORTEK Corporation KT 1948 1 2 SERVICING PRECAUTION WARNING 1 First reading safety precaution section of this manual If unforeseen circumstances create conflict between the servicing precautions and safely precaution always follow the safety precautions WARNING 2 A high voltage VR replaced in the wrong direction may cause excessive X RAY Emitting WARNING 3 An electrolytic capacitor installed which the wrong polarity might explode 1 Servicing precautions are printed on the label and should be followed closely 2 Always unplug the AC power cord from the AC power source before attempting to remove or reinstall 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 wiring have been correctly reinstalled Make sure that the area around the serviced part has not been demaged 4 Check the insulation between the blades of the AC plug and accessible conductive parts example metal parts input terminals 5 Never touch any of the locked voltage Do not apply AC power to the unit or any of its Assemblies unless all solid state heatsinks are correctly installed
19. nding mode after checking the status of input H V SYNC Here the output low signal and inverted high signal from Q603 control horizontal position horizontal size vertical size pincushion etc PIN24 uses 5V for the activation voltage of 601 and ZD603 and R607 in charge of this function AR601 performs pull up resistor function for PIN15 PIN22 of C601 and supplies 5V to each gate 3 CONTROL CIRCUIT CONTROL CIRCUIT 40V is supplied to PIN1 of control circuit and the voltage is transfor 4 7K 5 5 8 m 5 8 E D801 5 1VZ Sweet MANUAL DEGAUSSING JUMP ve 4JK v BN f se MINADJ CONTRAST R817 1K med into 5V by R814 D801 and C801 5V is controlled by V BLN S PIN V SIZE V POSI H SIZE H POSI 16V 10uF TANTAL R814 1 2W 10K and VR output to PIN5 7 8 11 12 of CN801 adjusted by H SIZE H POSI and VR output to PIN5 6 7 8 11 12 of CN801 and controls IC301 SW801 functions as manual degaussing switch and the output is to PIN9 of CN801 via R817 VR801 is contrast control VR and outputs the voltage controlled into PIN2 of CN801 VR810 is sub contrast VR adjusts MAX value and VR809 controls MIN value 4 HORIZONTAL DRIVE CIRCUIT HORIZONTAL DRIVE CIRCUIT HORIZONTAL R401 749 2W10 c417 4 Eo DRNE 16V of on 8 34 5 3
20. pplied from outside prevents the noise occurred from switching amp from flowing out through outer power line and the circuit is composed of C101 L101 C102 C103 and C104 The AC power supplied through line filter is then supplied to D101 and transformed into ripple current and finally transformed into DC by C105 The circuit of switching amp is composed of IC101 Q101 and peripheral circuits 101 oscillates and controls and Q101 performs switching function IC101 starts oscillation by the transformed DC power supplies through R102 and outputs the pulse to PIN6 IC101 PIN3 R106 R115 and R108 are composed to form OVER LODE prevention circuit and IC101 PIN1 2 and the peripheral circuits of IC102 performs voltage adjustment and stabilization function T102 is SYNC TRANS used to match the frequency of the monitor and power supply and used to prevent noise on the screen when the distance between switching trans and deflection yoke is close Switching trans transforms the produced pulse to fit to the voltage of each part and supplies the pulse to these parts DC voltage is supplied to PIN2 of T101 the pulse is produced at PIN4 and PIN6 7 is composed of a circuit which feeds back the changed amount of voltage and supplies VCC of IC101 PIN15 is a circuit supplying horizontal deflected voltage through 49V LINE and is composed of D120 C120 L110 and C121 R120 and C131 are improved FCC and SMOKE NOISE circuits of T101 is the
21. racy and temperature compensation SPECIFICATIONS PARAMETER MODEL KT 1948 OPERATING VOLTAGE OPERATING POWER LEAKAGE CURRENT TO CHASSIS GND AT 250VAC 50 60HZ LINE NEUT IN COMMON MIN TYP 100 115 230 85 HI POT LINE NEUT IN COMMON TO SECONDARY CHASSIS 1500VAC 50 60HZ NO BREAKDOWN OPERATING TEMPERATURE REL HUMIDITY OPERATING IMPLOSION PROTECTION DEGREES C PROVIDEO BY BAND AND MOUNTING LUGS MAGNETIC SHIELD INTERNAL DEGAUSSING VIDEO SIGNAL MANUAL AUTO 0 7Vpp 75 OHM MONITOR TERMINATIONS RASTER DIM ADJUST RANGE VERTICAL RASTER DIM ADJUST RANGE HORIZONTAL MODE PINCUSHION MIS CONVERGENCE CENTER CORNERS VERTICAL SCAN RATE HOLD IN RANGE HIGH LEVEL LOW LEVEL NON LINEARITY 5 HOLD IN RANGE HZ HZ SYNC PLARITY POSITIVE HIGH LEVEL LOW LEVEL 0 0 0 0 1 NONLINEARITY ee WHITE BALANCE X 281 170 020 311 i 0 020 LUMINANCE ADJUSTABLE WITH USER CONTROL 10 i 3 F L 55 1 5 F L 29 20 TIMMING CHART MODEL KT 1948 IBM VESA 31 5k 60 R 31 5K 60 A PREQUNCY s 31 5 5050 s 35k 5650 38K 6050 48K 6050 RESOLUTION 640 480 640 480 640 480 800 600 800 600 1024 768 DOT FREQ 25 175MS 25 175MS 25 175MS 36 000MS 40 000MS 65 000MS 31 469KS 31 469KSO 31 469KS 35 156KS 37 879KSO 48 363KS H DISPLAY 25 422US 25 42205
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