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Kortek KTN-2001 Service Manual

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SERVICE MANUAL

KTN-2001 / KTN-1401
Rev. No. : "A"
1

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Summary of Contents for Kortek KTN-2001

  • Page 1: Service Manual

    SERVICE MANUAL KTN-2001 / KTN-1401 Rev. No. : “A”...

  • Page 2: Table Of Contents

    CONTENTS 1.PRECAUTIONS ****** 2.PRODUCT SPECIFICATIONS ****** 3.OPERATING INSTRUCTIONS ****** 4.ADJUSTMENT ****** 5.BLOCK DIAGRAM ****** 6.GENERAL THEORY OF OPERATION ****** 7.TROUBLESHOOTING GUIDE ****** 8.WAVE FORM ******...

  • Page 3: Precautions

    KORTEK Corporation KTN-2001/1401 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.
  • Page 4 KORTEK Corporation KTN-2001/1401 READING SHOULD NOT BE ABOVE 0.45mA DEVICE UNDER TEST ALL TEST LEAKAGE CURRENT EXPOSED METAL TESTER SURFACES 2-WIRE CORD ALSO TEST WITH PLUG REVERSED(USING AC EARTH ADAPTER PLUG AS GROUND REQUIRED) Figurel 1 (TEST METHODE) 1-1-2. X-RADIATION...
  • Page 5 KORTEK Corporation KTN-2001/1401 1-2. SERVICING PRECAUTION WARNING 1 : First, reading "safety precaution" section of this manual. If unforeseen circumstances create conflict between the servicing precautions and safety precaution, always follow the safety precautions. WARNING 2 : A high voltage VR replaced in the wrong direction may cause excessive X-RAY Emitting.

  • Page 6: Product Specifications

    KORTEK Corporation KTN-2001/1401 2.Product Specifications 2-1 SPECIFICATIONS 1) KTN-2001 PARAMETER UNITS OPERATING VOLTAGE 115/230 OPERATING POWER WATTS < 0.40 LEAKAGE CURRENT TO CHASSIS GNG 0.45 AT250VAC,50/60Hz(LINE/NEUT,IN COMMON) < 2.0 HI-POT LINE/NEUT, IN COMMON OPERATING TEMPERATURE DEGREE REL,HUMIDITY OPERATING MAGNETIC SHIELD...
  • Page 7 KORTEK Corporation KTN-2001/1401 2) KTN-1401 PARAMETER UNITS OPERATING VOLTAGE 115/230 OPERATING POWER WATTS < 0.40 LEAKAGE CURRENT TO CHASSIS GNG 0.45 AT250VAC,50/60Hz(LINE/NEUT,IN COMMON) < 2.0 HI-POT LINE/NEUT, IN COMMON OPERATING TEMPERATURE DEGREE REL,HUMIDITY OPERATING MAGNETIC SHIELD INTERNAL DEGAUSSING MANUAL TYPE VIDEO SIGNAL +0.7Vpp,75 Ohm MONITOR TERMINATIONS...
  • Page 8 KORTEK Corporation KTN-2001/1401 2-2 PCB DIMENSIONS 1) MAIN PCB...
  • Page 9 KORTEK Corporation KTN-2001/1401 2) SOCKET PCB 2-2-1 6PIN SIGNAL CABLE CONNECTOR 2-2-2 PIN DESCRIPTION PIN - NO P I N -N A M E P I N 1 G R E E N P I N 2 B L U E...
  • Page 10 KORTEK Corporation KTN-2001/1401 2-3 TIMING CHART HORIZONTAL VIDEO HORIZONTAL SYNC VERTICAL VIDEO VERTICAL SYNC MODE STANDARD RESOLUTION SYNC POLARITY POSI POSI FREQUENCY ㎑ 15.750 PERIOD ㎲ 62.4 SYNC ㎲ ㎲ ACTIVE ㎲ 43.0 FREQUENCY ㎐ PERIOD ㎳ 16.62 SYNC ㎳...

  • Page 11: Operating Instructions

    KORTEK Corporation KTN-2001/1401 3. OPERATING INSTRUCTIONS 3-1 LOCATION FUNCTION OF CONTROL PCB ASS'Y 4.DJUSTMENT 4-1 ADJUSTMENT CONTROL 1) Orientation When servicing, always face the monitor 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.

  • Page 12: Adjustment

    KORTEK Corporation KTN-2001/1401 4-2 DISPLAY CONTROL ADJUSTMENTS [ *( ) for KTN-1401 ] A. SELECT H-SIZE FUNCTION, ADJUST TO THE HORIZONTAL SIZE IS 360 mm±3mm *(250 mm) ---------------------------- (V/R603) B: SELECT V-SIZE FUNCTION, ADJUST TO THE VERTICAL SIZE IS 190mm±3mm *(118mm) ------------------------------ (V/R204) C.

  • Page 13: Block Diagram

    KORTEK Corporation KTN-2001/1401 5. BLOCK DIAGRAM V I D E O P R EA M P R , G , B V I D E O D E I V E L M 1 2 0 3 N S I G N A L C O N T R O L...

  • Page 14: General Theory Of Operation

    KORTEK Corporation KTN-2001/1401 6. GENERAL THEORY OF OPERATION 6-1 BLOCK DIAGRAM Above is the block diagram of the monitor as a whole. Each major section is presented in a block. The individual circuit that make up the section is covered later and are not shown here.
  • Page 15 KORTEK Corporation KTN-2001/1401 Video signal (0.7V PP) supplied from “CN905 PIN1(RED), 3(GREEN), 5(BLUE)” is supplied to IC501 PIN4, 6, and amplified through 9C501, C502, C503. PIN 5, C511, PIN 8 C512, PIN 3 C513 and PIN 10 C514 are a capacitor for filter.
  • Page 16 KORTEK Corporation KTN-2001/1401 6-4 SMPS CIRCUIT SECTION Power supply is composed of line filter, switching AMP and switching trans circuit. Line filter circuit removes the noise element of power line supplied from outside and prevents noise generated in switching amp from flowing out to external power line. The circuit is made up of C401, L401, C402 and C403.
  • Page 17 KORTEK Corporation KTN-2001/1401 If the voltage to Q401 Base goes up, Vcc voltage goes down steeply, and FE401 becomes inactive. That makes Q401 Base voltage goes down, and voltage to FE401 Gate goes up, and hence, FE401 becomes active. Switching operation is performed as these processes are repeated. If high voltage feeds back, Q401 turns on, and voltage to FE401 Gate is reduced to stop and protect the circuit.
  • Page 18 KORTEK Corporation KTN-2001/1401 6-5 HORIZONTAL PROCESSOR SECTION IC301 (TDA2595) is the device designed to operate without SYNC supplied from outside by means of the output of horizontal frequency upon free running with the oscillation of the built-in OSC. IC301 is to be operated by the supplied 12V voltage with PIN No 15.
  • Page 19 KORTEK Corporation KTN-2001/1401 PIN 8 is a protection circuit and operates by detection of feedback current. Generally it can be used by set-up in the range of 1~8.5V. If abnormal phenomena happens, then high voltage goes up over about 27KV due to abrupt elevation of voltage, X-ray is discharged within Brown tube.
  • Page 20 KORTEK Corporation KTN-2001/1401 PIN 2 receives a voltage of 12V line and is connected to a voltage of about 22V while going through D202. This voltage is a terminal to amplify a voltage required in vertical deflection and send output. It receives from fly-back generator in the section of retrace time.
  • Page 21 KORTEK Corporation KTN-2001/1401 When horizontal drive receives output pulse from TDA2595 PIN 4 and supplies it to Q605 base, Q605 repeats on/off motion by pulse and at this time pulse generated at T601 operates T601. It is composed that if T601 operates, pulse abandoned from the secondary side of T601 can fully drive horizontal output TR.
  • Page 22 KORTEK Corporation KTN-2001/1401 6-9.SYNC CONTROL CIRCUIT This SYNC Control Circuit acts a role to transform so that output of constant level is always made regardless of input or no input of SYNC. In order to do so the circuit is composed using the chip built-in with 4 sets of EXCLUSIVE-OR Gate circuit.
  • Page 23 KORTEK Corporation KTN-2001/1401 6-10 KTN-2001 (1401) Adjustment Method *Notes - (1401) : Only different parts of 14”specification are expressly indicated. 1. B+ voltage adjustment method 1) Measuring terminal: D403 cathode side 2) Adjusting V/R: VR401 3) Adjusting voltage: 107±0.3V (110±0.5V) - Option 4) Measuring condition: AC 120V, 60 Hz, cross hatch pattern 5) Other voltage: 6.2±0.1V...
  • Page 24 KORTEK Corporation KTN-2001/1401 5. Horizontal Raster position adjustment 1) Adjusting V/R: no adjustment 2) Adjusting position: center of screen 6. Check of coordinates value 1) Adjusting position: center of screen (measured as CA-100 in CRT face) 2) Measuring condition: After adjusting Back Raster into 0.1F/L by varying of screen at Cross Hatch, measurement is made at max 70F/L in Window pattern X: 281±20...

  • Page 25: Troubleshooting Guide

    KORTEK Corporation KTN-2001/1401 7. TROUBLESHOOTING GUIDE 7-1 NO-POWER NO - POWER CHECK F101 CHANGE FUSE CHECK BD401 CHANGE BD401 CHECK FE401 CHECK & CHANGE CHANGE BD401 Q401 CHECK Q402, Q403 CHANGE Q402,3 CHECK B+ 110V CHECK T101 CHECK COMPONENT & CHANG...
  • Page 26 KORTEK Corporation KTN-2001/1401 7-2 NO-VIDEO NO - VIDEO CHECK R,G,B S IGNAL CHANGE S IGNAL CABLE CHECK IC501 CHANGE IC501 CHECK 12V CHECK & CHANGE CHECK & CHANGE IC301 D404 CHECK Q501,2,3 CHANGE Q401,2,3 CHECK CATHODE CHECK S G501,2,3 CHECK &...
  • Page 27 KORTEK Corporation KTN-2001/1401 7-3 NO-SYSC PLOBLEM NO - S YNC PLOBLEM CHECK IC801 CHANGE IC801 CHECK Q801,301 CHANGE Q801,301 CHECK IC301,IC201 CHECK & CHANGE CHECK & CHANGE C303,V/R302 C205 CHECK IC501 CHANGE IC501...
  • Page 28 KORTEK Corporation KTN-2001/1401 7-4 VERTICAL DEFLECTIOM PROBLEM VERTICAL DEFLECTION PROBLEM CHECK D202 CHANGE D202 CHECK IC201 CHANGE IC201 CHECK 12V CHECK & CHANGE CHECK & CHANGE IC301 D404 CHECK R218 CHANGE R218 CHECK DY CABLE CHANGE CDT...
  • Page 29 KORTEK Corporation KTN-2001/1401 7-5 HORIZONTAL DEFLECTION PLOBLEM HORIZONTAL DEFLECTION PROBLEM CHECK IC601 CHANGE IC601 CHECK Q601 CHANGE Q601 CHECK DRIVE CHECK & CHANGE CHECK & CHANGE Q604 IC301 CHECK CHANGE FBT CHECK DY CABLE CHANGE CDT...
  • Page 30 KORTEK Corporation KTN-2001/1401 7-6 X-RAY PROTECTION PLOBLEM X-RAY PROTECTION PROBLEM CHECK IC301 CHANGE IC301 CHECK VR303 CHANGE VR303 CHECK C311 CHECK & CHANGE C311 CHECK D301 CHANGE D301 CHECK CHANGE FBT...

  • Page 31: Wave Form

    KORTEK Corporation KTN-2001/1401 8. Waveform for major parts 1)FE401 DRAIN OUTPUT WAVEFORM 2)HORIZONTAL INPUT WAVEFORM 3) VERTICAL INPUT WAVEFORM 4) Q605 HORIZONTAL DRIVE WAVEFORM 5)Q604 HORIZON OUTPUT WAVEFORM 6)IC201PIN 1 VERTICAL OUTPUT WAVEFORM...
  • Page 32 KORTEK Corporation KTN-2001/1401 7)CLAMP(IC501 PIN 14) WAVEFORM 8) Q702 COLLECTOR PULSE WAVEFORM 9)IC501(1203) PIN 25 IN PUT WAVEFORM Q501 COLLECTOR WAVEFORM...

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Ktn-1401

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