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akira CT-21DS9A Service Manual

Colour tv chassis: 3y01
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Summary of Contents for akira CT-21DS9A

  • Page 2 CHASSIS: 3Y01 MODEL: CT-21DS9A CT-21DS9CP CT-21DS9CP(IKD) CT-21DS9CP(SKD) CT-21DS9N CT-21DS9R Model No: CT-21DS9A_21DS9CP_21DS9CP(IKD)_21DS9CP(SKD)_21DS9N_21DS9R Version 1.0...

  • Page 3: Table Of Contents

    CONTENTS Specifications ............…………………………. 4 X-Ray Radiation Precaution …………………………………………………… 5 Safety Precaution ………………………………………………………………. 5 Product Safety Notice ………………………………………………………….. 5 Alignment Instructions ………………………………………………………….. 6 Schematic Diagram …………………………………………………………….. 14 Model No: CT-21DS9A_21DS9CP_21DS9CP(IKD)_21DS9CP(SKD)_21DS9N_21DS9R Version 1.0...

  • Page 4: Specifications

    SPECIFICATIONS RECEIVING SYSTEM Sound System : A = BG/DK/I/M, R, N = BG/DK/I, CP = BG Colour System : A = PAL/SECAM/NTSC/NTSC P/B R, N = PAL/SECAM/NTSC P/B CP = PAL/NTSC P/B Picture Tube : 54 cm (21”) diagonal Ext. Antenna : 75 Ohm Coaxial Cable Ext.

  • Page 5: X-Ray Radiation Precaution

    CAUTION Before serving the chassis, read the “X-Ray Radiation Precaution”, “Safety Precaution” and “Product Safety Notice” on this page. X-RAY RADIATION PRECAUTION Excessive high voltage can produce potentially hazardous X-Ray Radiation. To avoid such hazards, the high voltage must not be above the specified limit. The normal value of the high voltage of this receiver is 24KV at zero beam current (minimum brightness) under 220V AC power source.

  • Page 6: Alignment Instructions

    ALIGNMENT INSTRUCTION (3Y01) GENERAL SET-UP Please notice the following before alignment and equipment: 1.1. Don’t short any two soldering points, which should not be shorted and don’t touch any components, which should not be touched. 1.2. Please pull out plug before equipment. 1.3.
  • Page 7 (A) MAIN CHASSIS ALIGNMENT IF Alignment for main chassis 1.1. PIF Adjustment (38.9MHz) 1.2. Tuner AGC connects to GND. Pattern Generator outputs 38.9MHz R.F. signal and connects to tuner output terminal or pin5 of saw filter. 1.3. Connect Digital voltmeter across C227. DC Regulated power supply positive terminal output +20V to pin1of IC203 and negative terminal of D608.
  • Page 8 System NTSC Adjust (L108). 2.1. Tuner AGC connects to GND. Connect Sweep Signal Generator to tuner IF output terminal. oscilloscope V-IN terminal connects to C109. And connect Q102 'base' pole to the power terminal(+9V) of R104 through a 10K resistor.(shown in FIG.2) 2.2.
  • Page 9 33.4MHz 39.5MHz THE UPMOST POINT 32.4MHz 38.9M B+ adjustment 3.1. Disconnect horizontal load. Connect a light bulb (100 W) AC 250V across C321. 3.2. Connect 220V AC 50Hz to CN601 and switch on power switch. 3.3. Test the voltage with digital voltage meter between C321 two terminals. 3.4.
  • Page 10 (A) White Balance Adjustment (Applied in factory only) 4.1. Set the TV set to AV mode. Receive black white pattern (Color Temperature test pattern). 4.2. Insert 6 Pin Service flat cable into CN002. Press adjustment keys, and then go to automatic white balance adjustment.
  • Page 11 COLOR PURITY ADJUSTMENT 9.1. Before color purity adjustment, Warm up the TV set over 15 minutes and fully degauss. 9.2. Receive pure white signal in AV status and set the TV receiver dynamic. 9.3. Go to factory mode “MENU2”. After write down the values of R-BIAS and B-BIAS, set the values of R-BIAS and B-BIAS zero.
  • Page 12 OK and white balance are OK. Also check the complete screen picture quality. High voltage condition OK and the Screen picture must be OK. 1.4. Check all the functional keys must be working well. 1.5. Receive colour pattern signal and the system colour. (PAL/SECAM/NTSC). Check the power main on/off switch, brightness, volume, colour, contrast and tint.
  • Page 13 Appendix: If customer logo is needed, please set LOGO ON 1 and CUS.LOGO (or CUSTOM LOGO) 1 at the SERVICE MODE. Change the data of E prom to get the custom logo with special implement ( I2C converter Board and Computer). Please see the details as following. Method to Write Data for Custom Logo The are total 12 characters that can be input into E prom and display on the TV.

  • Page 14: Schematic Diagram

    Chassis 3Y01 (150V ~ 260V)
  • Page 15 Chassis 3Y01 (90V ~ 260V)

This manual is also suitable for:

Ct-21ds9cpCt-21ds9cp(skd)Ct-21ds9cp(ikd)Ct-21ds9nCt-21ds9r