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akira CT-21TF9 Service Manual

Ct-21tf9a/ ct-21tf9c/ ct-21tf9cp/ ct-21tf9cp(ikd)/ ct-21tf9cp(skd)/ ct-21tf9cp(m)/ ct-21tf9n / ct-21tf9r
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Summary of Contents for akira CT-21TF9

  • Page 2 CHASSIS: 3Y01 MODEL: CT-21TF9A CT-21TF9C CT-21TF9CP CT-21TF9CP(IKD) CT-21TF9CP(SKD) CT-21TF9CP(M) CT-21TF9N CT-21TF9R Model No: CT-21TF9A_21TF9C_21TF9CP_21TF9CP(IKD)_21TF9CP(SKD)_21TF9CP(M)_21TF9N_21TF9R 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-21TF9A_21TF9C_21TF9CP_21TF9CP(IKD)_21TF9CP(SKD)_21TF9CP(M)_21TF9N_21TF9R 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: Safety 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 1. 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 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 resis- tor.(shown in FIG.2) 2.2.
  • Page 9 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 4.6. Go to factory mode “MENU2” according to 4-4-2. Obtain Low Bright area to x=281and y=311 by adjusting R.bias and B.bias. Obtain High Bright area to x=281and y=311 by adjusting R.drive and B.drive. Obtain both area to x=281 and y=311 by adjusting the two status repeatedly. SUB-BRIGHT ADJUSTMENT Receive GREY SCALE signal.
  • Page 11 CONVERGENCE ADJUSTMENT 10.1. Receive a dotted pattern. Set the TV receiver dynamic. 10.2. Loose the convergence magnet clamper and align red with blue dots at the center of the screen by rotating (R, B) static convergence magnets. 10.3. Align Red/Blue with green dots at the center of the screen by rotating (RB-G) static convergence magnet.
  • Page 12 1.7. Use remote Control Unit for all types of function check and ensure OK. 1.8. Check the words display condition. 1.9. Shock test and make sure the picture and sound are not distorted and shifted. 1.10. Use strong and weak signal to check the colour picture condition. After adjust the signal level to 35-40 dB and the colour should not gone.
  • 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.
  • Page 14 Chassis 3Y01 (150V ~ 260V)

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