Click here to load reader

Sanyo Chassis 2112 Ec7a

  • View
    152

  • Download
    6

Embed Size (px)

Text of Sanyo Chassis 2112 Ec7a

  • Service manual Chassis 2112Chassis description Series EC7-A

    Colour television

    NoteThis TV receiver will not work properly in foreign countrieswhere the television transmission system and powersource differ from the design specifications. Refer to thespecifications for the design specifications.

    Ref. N MS CHASSIS2112-I16/06/2000

  • Service manual CHASSIS 2112-Series EC7-A

    1

    INDEX1. SAFETY INSTRUCTIONS..................................................................................................................................... 3

    1.1 WARNING. ........................................................................................................................................................ 31.2 PRECAUTIONS AGAINST X-RAYS. ....................................................................................................................... 31.3 RECOMMENDATIONS TO PROTECT OUR ENVIRONMENT......................................................................................... 31.4 SAFETY AND EMC (ELECTROMAGNETIC COMPATIBILITY). ................................................................................... 3

    2. TECHNICAL CHARATERISTICS. ........................................................................................................................ 4

    3. BLOCK DIAGRAM ................................................................................................................................................ 5

    3.1 INTEGRATED CIRCUITS....................................................................................................................................... 6

    4. DETAILED DESCRIPTION IN BLOCKS .............................................................................................................. 6

    4.1 POWER SUPPLY. ............................................................................................................................................... 64.1.1 Switched Mode Power Supply (SMPS)..................................................................................................... 6

    4.1.1.1 IC800 controller start-up..................................................................................................................... 64.1.2 Normal functioning ("on"). ......................................................................................................................... 6

    4.1.2.1 Duty cycle. .......................................................................................................................................... 64.1.2.2 Regulation. ......................................................................................................................................... 6

    4.1.3 "Stand-by". ................................................................................................................................................ 74.1.4 +8v and +5v regulators ........................................................................................................................ 7

    4.1.4.1 Configuration. ..................................................................................................................................... 74.1.4.2 stand-by / ON control .................................................................................................................... 74.1.4.3 Regulator output short circuit protection. ........................................................................................... 74.1.4.4 Mains switch off detection. ................................................................................................................. 74.1.4.5 Power supply signals and micro signals interrelation......................................................................... 8

    4.2 TELETEXT AND MICROPROCESSOR. .................................................................................................................... 84.2.1 Ports description. ...................................................................................................................................... 84.2.2 Supply....................................................................................................................................................... 94.2.3 Oscillator................................................................................................................................................... 94.2.4 Reset. ....................................................................................................................................................... 94.2.5 RGB output, character generator.............................................................................................................. 9

    4.2.5.1 Character generator synchronism...................................................................................................... 94.2.5.2 RGB output voltage. ........................................................................................................................... 9

    4.2.6 Teletext (only for ST92195 version).......................................................................................................... 94.2.6.1 Non-interlaced. ................................................................................................................................. 10

    4.2.7 PD signal. ............................................................................................................................................. 104.2.8 ON signal. ............................................................................................................................................... 104.2.9 Radio control signals. ............................................................................................................................. 104.2.10 SC signal. ............................................................................................................................................ 104.2.11 SUP_FAIL signal. .............................................................................................................................. 104.2.12 AM/SCART signal.............................................................................................................................. 104.2.13 LP/L signal......................................................................................................................................... 104.2.14 AM/FM signal..................................................................................................................................... 104.2.15 DEFL_FAIL signal. ............................................................................................................................ 104.2.16 I2C bus and peripherics connected to (SDA y SCL). .......................................................................... 104.2.17 CF1 and CF2 signals........................................................................................................................... 104.2.18 Tuning control signals (-AGC_LS, -LB, -MB, -HB, VTUNE). ............................................................... 104.2.19 BEEP signal......................................................................................................................................... 114.2.20 WIDTH signal. ..................................................................................................................................... 114.2.21 MUTE signal. ....................................................................................................................................... 114.2.22 LED signal. .......................................................................................................................................... 114.2.23 Customer instructions reception (IR and KEY signals). ...................................................................... 11

    4.3 HORIZONTAL DEFLECTION................................................................................................................................ 114.3.1 Driver stage. ........................................................................................................................................... 11

    4.3.1.1 Driver stage power. .......................................................................................................................... 114.3.1.2 Driver stage start-up......................................................................................................................... 11

    4.3.2 Line stage. .............................................................................................................................................. 114.3.3 Width adjustment. ................................................................................................................................... 124.3.4 H_FLY&SYNC signal generation............................................................................................................ 124.3.5 Recovered line voltages. ........................................................................................................................ 12

  • Service manual CHASSIS 2112-Series EC7-A

    2

    4.3.5.1 Heater supply. .................................................................................................................................. 124.3.6 EHT discharge. ....................................................................................................................................... 124.3.7 Protections.............................................................................................................................................. 12

    4.3.7.1 Low Flyback protection............................................................................................