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akira CT-14GT9A Service Manual

Ct-14gt9 series
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Summary of Contents for akira CT-14GT9A

  • Page 2 CHASSIS: CN-ER MODEL: CT-14GT9A CT-14GT9CP CT-14GT9N CT-14GT9R Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R Version 1.0...

  • Page 3: Table Of Contents

    CONTENTS Specifications ..........……………………………... 04-04 X-Ray Radiation Precaution …..………………….…………………. 05-05 Safety Precaution ................05-05 Product Safety Notice ……………………………………..……………05-05 Alignment and Test Instructions ............06-14 Electrical Parameters of Main IC and Components ......…15-19 Troubleshoot Flowchart ..............20-24 Schematic Diagram …………..………………………………………. 25-28 Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R 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 : 14” = 37cm 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 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 And Test Instructions

    ALIGNMENT AND TEST INSTRUCTION MAIN CHASSIS ALIGNMENT INSTRUCTION Equipment requirement:- • Colour Television signal generator or Central TV signal generator • IF alignment – Philips Gen. 5418 or 5518 • Scope 20 MHz – 2 channels types • Digital multi-meter with LED display 4 digits •...
  • Page 7 To Inspect Functions of Buttons and Remote Controller • Inspection Equipment Remote controller Inspected Buttons on the TV TV/A V d. POSITION UP/DOWN VOLUME UP/DOWN MENU • Inspected Buttons on the remote Controller POWER ON/STANDBY POSITION UP/DOWN TV/A V d. VOLUME UP/DOWN MENU g.
  • Page 8 Aging • Aging Setting • Equipment to Be Required • Remote controller • Setting Method • Set the volume to 0, and brightness, contrast and chroma to maximum. • Set the TV in the M mode. • Aging Voltage and Aging Time •...
  • Page 9 Rough Adjustment of White Balance (Dark Balance Adjustment) and Focus Adjustment Adjustment Equipment Remote transmitting jig Adjustment Method In the TV mode, set the brightness to 32 and contrast, chroma, sub brightness and sub contrast to 0. Set BLUE BACK off. Disconnect the signal cable. d.
  • Page 10 Adjustment for Automatic White Balance Adjustment Equipment White balance adjuster d. Adjustment Method Insert the cord plug connected with the PC into the socket XS701 on the main chassis board. Control the PC to give an instruction to set the TV in the white balance adjustment mode.
  • Page 11 Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R Version 1.0...
  • Page 12 Video Geometry Adjustment • Adjustment Equipment Remote transmitting jig • PAL Video Geometry Adjustment Switch on the TV to receive CH-5 PAL circle pattern signal. Press the H CEN button on the remote transmitting jig to adjust H CEN data so that horizontal center of the picture coincides with horizontal center of the CRT.
  • Page 13 • Inspection Method Receive PAL color test card signal. Check picture definition dependent on definition of 3.8MHz in multi wave group. Check reflection after observing black line with white background on top of the circle and white line with black background on bottom of circle of the circle pattern.
  • Page 14 16. Safety Inspection Test safety of all naked metal of the TV Supply high voltage of 3000V, 50Hz and current of 10mA to the TV after ensuring that test rod contacts with tested point well. Test every point for 1 min. and ensure no arcing and sparking.

  • Page 15: Electrical Parameters Of Main Ic And Components

    Electrical Parameters Of Main IC And Components BIMOS IC Pins and Function BIMOS IC LA76810 Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R Version 1.0...
  • Page 16 CPU IC Pins and Function CPU IC CHT0400 Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R Version 1.0...
  • Page 17 EEPROM IC Pins and Function EEPROM ST24C04 Sound Amplifier IC Pins and Function Sound Amplifier IC LA4225 Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R Version 1.0...
  • Page 18 Vertical IC Pins and Function Vertical IC LA7840 Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R Version 1.0...
  • Page 19 TRANSISTOR STATIC OPERATING POINT & IC’s OHMIC RESISTANCE TO GROUND Item IC OHMIC RESISTANCE TO GROUND ( Use R x 1K Range, With −VE Black Probe to Ground ) Base Collector Emitter V585 0.10 Type Value Value Type Value Value ( Ω...

  • Page 20: Troubleshoot Flowchart

    Troubleshoot Flowchart Switch Mode Power Supply SWITCH MODE POWER SUPPLY FAULTY +130V Supply Line Abnormal +300V Supply Normal. ? Normal Too High Too Low Check for Check for Check for Open-circuit Components Open-circuit Components Rectifier/Filter Circuit R556, VD561, V553, R520 ∼ R524, V511, V512, V513 and associate VD515, V511, V512, R526 components.
  • Page 21 Micro-controller System Circuit Remote Control System Faulty Check Keyboard Input or Remote Control Unit Input Command; any respond ? Keyboard input normal; All no respond but no respond to remote controller. Respond to commands Normal input but Check D701 Pin 12, 17 during Check IR voltage level;...
  • Page 22 Video Processing Circuit VIDEO PROCESSING CIRCUIT FAULTY Check N101 Pin 38, Video Signal Black and 39 associate circuit Color Picture but Input /Output White Picture, components; any abnormal brightness Waveform No color faulty components? Under Service Align Mode Check +190V normal VD555A, C908, Replace N101 or...
  • Page 23 Inter-carrier Audio Processing Circuit Color Picture Only but No Sound Reception of AV Check N101 pin 9 Signal input; Any and associate circuit sound output Check V183 (b) Check related low @ high voltage noise amplifier level ? circuit V185, R188, D701 Check N181 pin 5 Normal...
  • Page 24 Horizontal / Vertical Deflection Circuit Horizontal / Vertical Deflection Circuit Faulty Check components C224, C226, C249, C250, Check N101 Pin 25, Abnormal VD251, VD209, R209, 43 voltage level; is V583, D554, RF569: if it normal ? faulty replace bad component with same type Normal Check N101 pin 30, Check and replace...

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