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akira 21BHS3/CE Service Manual

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Summary of Contents for akira 21BHS3/CE

  • Page 2 Model No: 21BHS3CE Version 1.0...

  • Page 3: Table Of Contents

    CONTENT SPECIFICATION ............................ 4 THE SURVEY ............................5 SIGNAL PROCESS ..........................6 HORIZONTAL AND VERTICAL CIRCUIT ..................7 IC ILLUSTRATION ..........................8 FACTORY MENU..........................15 CIRCUIT DIAGRAM ..........................19 EXPLODED VIEW AND PART NAME ....................20 BOM LIST ............................. 21 Model No: 21BHS3CE Version 1.0...

  • Page 4: Specification

    SPECIFICATION Rated Voltage AC 140V~250V 50Hz/60Hz Sound output: 5W×2 Screen size Picture tube 54cm Color System: NTSC Sound 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 38.9 MHz Video/Audio (L/R) 2set input YUV input...

  • Page 5: The Survey

    THE SURVEY Table 1, the main IC and functions Number Function Remark Power supply KA5Q0765RT N611 CPU + SIGNAL PROCESSER OM 8370 /TDA9370 N301 Field driver STV9302A N401 Sound driver AN7522N N161 N801 (Video) AV SWITCH TC4052BP N121 (sound) Memory AT24C08 N702 Photo-coupler...

  • Page 6: Signal Process

    SIGNAL PROCESS The TV signal enters into tuner (A201) from cable or antenna. Pin 10 and pin 11 of N301 are combined to select the band. Pin 4 of N301 outputs PWM tuning signal. The 38.9MHz IF signal is coupled to V308 (pre-amplify) and then to SAWF (Z301).

  • Page 7: Horizontal And Vertical Circuit

    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 pin 33 is transferred to the horizontal-drive transistor. The cathode driving voltage 180V vertical drive voltage +15V and –15V are all generated from FBT.

  • Page 8: Ic Illustration

    IC ILLUSTRATION Fig 1 OM 8370 illustration Model No: 21BHS3CE Version 1.0...
  • Page 9 Pin 1 Standby control, “1” is on, “0” is off. Pin 2 Pin 3 Pin 4 Tuning PWM output Pin 5 Auto AV control SW, connected with the SCART 8 pin. Input. The rising edge or the falling edge operates. Pin 6 Key board input.
  • Page 10 Pin 36 EHT tracking /over voltage protection. If something is wrong, the anode high voltage rise the heater voltage will rise too. When the rising voltage arrive some limit, the V406 works, the voltage of pin 36 will exceed 3.9V. The OM8370 will stop working.
  • Page 11 Fig. 2 HEF4052BP Illustration Model No: 21BHS3CE Version 1.0...
  • Page 12 Function table Input Channel On Ē – Z – Z – Z – Z – Z – Z – Z – Z NONE Notes: H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial Model No: 21BHS3CE Version 1.0...
  • Page 13 Fig 3 STV9302A Illustration Block diagram Inverting input VER output Output stage V Pump up out Non inv. Put Fig 4 AN7522N Illustration Model No: 21BHS3CE Version 1.0...
  • Page 14 Fig 5 KA5Q0765RT Illustration Model No: 21BHS3CE Version 1.0...

  • Page 15: Factory Menu

    FACTORY MENU Main power +B setting Receive standard color pattern RF signal. Set picture to “Standard Mode”. Adjust VR501, to get +B (VD542 -) voltage =110V. C bus control adjustment method How to enter and exit factory mode (with customer’s remote controller) 1.
  • Page 16 Menu 3 Item Preset value Definition Bright in W/B mode Contrast in W/B mode Screen mode (press Vol +/- or CH +/- key to enter or exit). Adjust screen knob on FBT to adjust the bright of the line. Red bias adjust Green bias adjust Red drive adjust Green drive adjust...
  • Page 17 Menu 3 Item Preset value Definition Over scan switch Off. 0: not available 1: available AGC SPEED 0: Slow AGC action. IF –AGC capacitor is 3.1uF. 1: Normal. IF –AGC capacitor is 2.2uF. 2: Fast AGC action. 3 times speed than normal. 3: Fast AGC action.
  • Page 18 Menu 9 Item Preset value Definition BAND Must be 2 according to be TUNER START ON 0: Last memory mode: TV_mode 1: Power on standby mode. LOGO No use ON DELAY Power on delay time adjust ON DELAY M Preset on delay time CURTAIN OSD FORM From 0 to 3...

  • Page 20: Exploded View And Part Name

    EXPLODED VIEW AND PART NAME Model No: 21BHS3CE Version 1.0...

  • Page 21: Bom List

    BOM LIST PART NO. TYPE /MODEL SPECIFICATION RVVZ-2Y-F 3A1M POWER CORD XS501 H03VVH2-F WITH XS501A PHP-208 POWER PLUG H03VVH2-F 2 PIN insulated LY42 2×0.75mm YS-07(plug) H03VVH2-F(wire) K501 PS6E-B XS1504 PS5E-A POWER SWITCH KDC-A06 KDC-A04 FUSE F501 RT1-20 AC 250V 2.5A LCLI-5 (LCL-1623) LCLII-5 (LCL-2012) LCL-07G...
  • Page 22 PART NO. TYPE /MODEL SPECIFICATION HS817B OPTOCOUPLER N504 PC817B EL817 AC HIGH CT81 VOLGAGE C515 AC400V/AC250V 100- CERAMIC C515A 4700PF CD-250V CAPACITOR F-250V METALLIZED POLYERTER AC250V/275V/300V FILM C501 10nF-2.2uF, CBB62 INTERFERENCE C502 SUPPRESSION CAPACITOR PTDCA1BF7R0Q200 THERMISTOR PS501 MZ73 PDC7 RI40 1/2W-24M-K ISOLATED R519...
  • Page 23 PART NO. TYPE /MODEL SPECIFICATION A51LYZ095X91 A51CPP01X01A A51LYG70X COLOUR V901 PICTURE TUBE A51LYZ095X95 A51QDX993X A51QDJ420X HIPS/FRHIPS FH3 ～ 40mm/min /FVO BACK COVER HIPS/FRHIPS MAIN BRACKET TJC1-2Y Model No: 21BHS3CE Version 1.0...

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