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akira 21WHS3 Service Manual

Color tv
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Summary of Contents for akira 21WHS3

  • Page 2 Model No: 21WHS3BN Version 1.0...

  • Page 3: Table Of Contents

    CONTENT SPECIFICATION ............................ 4 THE SURVEY ............................5 THE MAIN CHIPS INSTRUCTION....................... 6 SIGNAL PROCESS ..........................8 THE HORIZONTAL AND VERTICAL CIRCUIT ................9 FACTORY MENU..........................11 APPENDIX ............................14 CIRCUIT DIAGRAM ..........................18 EXPLODED VIEW WITH PART NAME .................... 19 Model No: 21WHS3BN Version 1.0...

  • Page 4: Specification

    SPECIFICATION Rated Voltage AC 110V~250V 50Hz/60Hz Power Consumption Sound output: 3W×2 Screen size Picture tube 21 inch PAL SECAM Color System: NTSC Sound D.K / B.G VHF Low channel (VL) =48.25 to 147.25 MHz Channel coverage: VHF high channel (VH) =154.25 to 463.25 MHz UHF channel (U) =471.25 to 863.25 MHz...

  • Page 5: The Survey

    THE SURVEY Table 1, the main IC and functions Number Function Remark Power supply KA5Q0765RT N501 CPU + SIGNAL PROCESSER TDA9381 N301 Field driver LA78040 STV9302A N401 Sound processor TDA9859 N122 Sound driver AN7522N(stereo) N161 AV SWITCH TC4052BP N801 (Video) 5V Regulator L7805CV N505...

  • Page 6: The Main Chips Instruction

    THE MAIN CHIPS INSTRUCTION The UOC (“Ultimate One Chip”) TDA9381/61 is adopted in this chassis. This IC is the first available component that contains the complete control and small signal functionality needed for a TV application in one device. 1. The UOC TDA9361/81 pins function description ： （ total 64 pins ）...
  • Page 7 Pin30: GND. Pin31: Sound loop filter. Pin32: AVL filter, according to the different soft edition. Pin33: Horizontal drive signal output, needs a resistance in series to +8V. Pin34: Sandcastle output/flyback input. Pin35: External audio input, this pin is no use. EHT tracking/ over voltage protection.

  • Page 8: Signal Process

    SIGNAL PROCESS The main chip is N301 TDA9381, AV control switch HEF4052 (video), sound process chip is TDA9859 (AV audio), sound driver is N601 AN7522N. The TV signal inputs into the tuner (A201) from CABLE or antenna. The pin 10 and pin 11 of the N301 are combined to select the band.

  • Page 9: The Horizontal And Vertical Circuit

    THE HORIZONTAL AND VERTICAL CIRCUIT Through Synchronous separating circuit, the video signal is divided into horizontal-Synchronizing signal and Vertical-Synchronizing signal. The horizontal-Sync pulse coming from the pin 33 is transferred to the horizontal-drive transistor, and will be used to drive the horizontal-transformer. The horizontal-switch transistor is V451, it and the +B supply drives the flyback transformer to generate the anode high voltage, the focus voltage, the screen voltage, the CRT board drive voltage 190V, the vertical drive voltage 15V and -15V.
  • Page 10 Power supply The IC of KA5Q0765RT is adapted in this chassis; it is the product of Fairchild. It supplies four DC voltages, one is the +B ＝ 110V, another is Hcc ＝ 26V, the third is 13V (the sound drive voltage), the fourth is +16V.

  • Page 11: Factory Menu

    FACTORY MENU Factory menu Items Variable Preset data Remark ON/OFF Unadjustable ON/OFF Unadjustable FMWS ON/OFF Unadjustable ON/OFF Unadjustable ON/OFF Unadjustable ON/OFF Unadjustable WOOFER ON/OFF Unadjustable DUAL OUT Unadjustable Volume mode Unadjustable Vol pin Push-pull open-drain Push-pull Unadjustable BAND Unadjustable AV CFG Unadjustable NTSC MX USA JAP...
  • Page 12 Factory menu Items Variable Preset data Remark SUBCON 0~63 Adjustable SUBCOL 0~63 Adjustable SUBSHP 0~63 Adjustable SUBTINT 0~63 Adjustable YDLY PAL 0~15 Adjustable YDLY NTSC 0~15 Adjustable YDLY SEC 0~15 Adjustable YDLY AV 0~15 Adjustable UOC VOL ON/OFF Adjustable UOC VOL 0~63 Adjustable CATHODE...
  • Page 13 Factory menu Items Variable Preset data Remark FREQUENCY 50 60HZ 50HZ Adjustable VSLOPE 0~63 Adjustable VSHIFT 0~63 Adjustable VAMP 0~63 Adjustable VSCOR 0~63 Adjustable HSHIFT 0~63 Adjustable RGB HSHIFT 0~63 Adjustable RGB POS 0~48 Adjustable 0~63 Adjustable 0~63 Adjustable ON/OFF Adjustable 0~63 Adjustable...

  • Page 14: Appendix

    APPENDIX HEF4052B illustration Model No: 21WHS3BN Version 1.0...
  • Page 15 TDA9859 illustration 1 Model No: 21WHS3BN Version 1.0...
  • Page 16 TDA9859 illustration 2 Model No: 21WHS3BN Version 1.0...
  • Page 17 KA5Q0765RT illustration AN7522N illustration Model No: 21WHS3BN Version 1.0...

  • Page 19: Exploded View With Part Name

    EXPLODED VIEW WITH PART NAME Model No: 21WHS3BN Version 1.0...

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