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Hughes JVC Projector 230 Sc Service Manual

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    							Chapter 2---System Description
    Model 230 Service Manual2-29
    HIGH VOLTAGE POWER SUPPLY
    INPUTS DESCRIPTION
    G1_SUPPLY Supply for G1 grid of CRTs. About -200 V
    G2_SUPPLY Supply for G2 (screen) grid of CRTs. About 1200 V
    RED_FOCU
    S
    GRN_FOCU
    S
    BLU_FOCU
    SFocus supply for CRTs. about 7 KV
    OUTPUTS DESCRIPTION
    ARC_GND CRT ground (anode supply return line)
    HORIZONTAL/VERTICAL DEFLECTION BOARD
    INPUTS DESCRIPTION
    /SWEEP_OK Deflection detection line. open collector, low = good deflection
    RASTER TIMING GENERATOR BOARD
    INPUTS DESCRIPTION
    BLANKING Blanking signal. logic F type
    CRTS
    OUTPUTS DESCRIPTION
    RED_FOCU
    S
    GRN_FOCU
    S
    BLU_FOCU
    SFocus supply of CRTs. about 7 KV.
    RED_GRID1
    GRN_GRID1
    BLU_GRID1Grid 1 (G1) signal of CRTs.
    RED_HEAT+
    GRN_HEAT
    +BLU_HEAT
    +Positive side of the heater voltage for CRTs. About 6.2 V. 
    						
    							Chapter 2---System Description
    2-30Model 230 Service Manual
    RED_HEAT-
    GRN_HEAT-
    BLU_HEAT-Negative side (return line) of the heater voltage for CRTs. Ground
    level.
    RED_
    CATHODE
    GRN_
    CATHODE
    BLU_
    CATHODEVideo output signals of the VAB. about 40 VPP with peak voltage of
    about 70 V.
    RED_GRID2
    GRN_GRID2
    BLU_GRID2G2 (screen) supply of CRTs. about 600 to 800 V
    OUTPUTS DESCRIPTION
    ARC_GRD Ground of CRTs ( anode supply return line).
    SYSTEM POWER SUPPLY
    INPUTS DESCRIPTION
    +6.2 V +6.2 V supply line (heater voltage).
    +15 V +15 V supply for use by Video Amplifier Board.
    -15 V -15 V supply for use by Video Amplifier Board.
    +80 V +80 V supply for use by Video Amplifier Board.
    Interlocks and protection:
    None
    2.3.6   System Controller PCB
    The System Controller Board (SCB) is located in the electronic card cage (Figure
    5-1).
    The Electronics System is controlled by the SCB. The SCB uses digital and
    analog circuits to direct the operation of image and raster generation circuits and
    to control the input/output of power supply operation.
    The SCB sets the operating parameters of the image, such as brightness and
    contrast. It also produces internal test patterns and generates on-screen display
    overlays. The SCB sets the timing for the raster generation to adjust phase,
    geometric corrections, shading corrections, and convergence. The program
    memory and the memory for all convergence and shading maps are located on
    the SCB.
    The following functions are performed or controlled by the System Controller:
    •  Enables control for the Low Voltage Power Supply, Arc Lamp and
    cooling fans. 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-31
    •  Fault monitors the HVPS, LVPS, Arc Lamp, and fans.
    •  Provides interboard communication via the IIC serial bus.
    •  Controls Zoom and Focus of the Projection Lens.
    •  IIC Interface control
    •  Provides Video Overlays
    •  X and Y convergence control
    •  Threshold and Sensitivity for shading
    • I/O control
    •  Two RS-232 serial interface ports
    •  Infrared (IR) remote control interface. Accepts input from front or rear
    IR detectors.
    •  A 5-wire JTAG interface port for CPU emulation support.
    •  External 3 color system status LEDs. Green indicates normal, yellow
    is standby and red indicates a fault condition.
    •  External Service Mode switch (see Figure 5-1). Pressing this switch
    during a power-up sequence brings the system up in a diagnostic
    mode (for maintenance) rather than a normal operating mode.
    The SCB I/O diagram (Figure 2-12) and the list of Inputs and Outputs (Table 2-
    11) provide information for the technician to perform module-level
    troubleshooting. 
    						
    							Chapter 2---System Description
    2-32Model 230 Service Manual
    P11
    B23
    B24
    B28
    B29
    B32 B27
    B26
    B31
    B30
    Lens Zoom
    Lens Focus
    /LV_ENA
    /FAN_ENA
    /LAMP_ENA/HV_OK/LV_OK
    /LAMP_LIT/LAMP_OK
    P10
    B31
    B30
    A32
    A31
    A30
    A   B
    20-20
    21-21
    22-22
    23-23
    24-24
    25-25
    26-26
    27-27
    28-28
    29-29+5.1V stby
    +5.1V
    +15V
    -15V
    GND
    ODD_FIELD
    SRC_VALID
    H_DRIVE_SC
    V_DRIVE
    B9
    B10
    B2
    B1
    B3
    RED_OVER
    GRN_OVER
    BLU_OVERB18
    B17
    B16
    P10
    Y_RED_CONV
    Y_GRN_CONV
    Y_BLU_CONV
    X_RED_CONV
    X_GRN_CONV
    X_BLU_CONV
    B4
    B5
    B6
    B1
    B2
    B3
    BLU_THRES
    GRN_THRES
    RED_THRES
    BLU_SENS
    GRN_SENS
    RED_SENS
    B8
    B9
    B10
    B11
    B12
    B13IIC_DATA
    IIC_CLK1 IIC_CLK
    IIC_CLK3IIC_CLK2
    SYSTEM
    CONTROLLER
    BOARD
    TO PROJ
    LENS
    FROM
    LVPS
    FROM
    HVPS
    FROM
    ALPS
    FROM
    RTG
    FROM
    LVPSTO
    VPB
    TO
    CDB
    TO
    VPB
    H_F2V
    Figure 2-12.  System Controller Board, Block Diagram.
    IIC Interface
    Communications are performed through the IIC bus to the other PCBs in the
    system.This three wire bus interface consists of clock line, data line and interrupt
    line. Data transferred over the IIC bus is listed in Table 2-9 (I/O signals).
    System Controller Board Input/Output
    This section provides a description of the inputs to and outputs from the SCB.
    The I/O descriptions are arranged by the source/destination of the signal. The
    format used is such that the assembly communicated with is used as the primary
    heading of each output. Input refers to an input to the SCB, output refers to an
    output from the SCB. 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-33
    Table 2-11.  System Controller Board I/O signals
    VIDEO PROCESSOR BOARD
    I/O DESCRIPTION
    IIC_CLK IIC clock line. Clock line for control of synchronous data transfer
    over the IIC bus interface.
    IIC_DATA IIC data line. Serial line for synchronous data transfer of the
    following data between Video Processor Board and SCB board.
    I=Input, O=Output.
    I     BEAM CURRENT
    I     OK DETECT
    O    RED_CONT
    O    GRN_CONT
    O    BLU_CONT
    O    BRIGHTNESS
    O    RED_G2
    O    BLU_G2
    O    GRN_G2
    O    WHT_BOOST
    O    BLK_BOOST
    OUTPUTS DESCRIPTION
    OVERLAY Overlay control signal
    /IIC_INT IIC interrupt line.
    RED_OVER Red signal of on-screen menu and/or internal test pattern
    GRN_OVER Similar to RED_OVER
    BLU_OVER Similar to RED_OVER
    BLU_THRES Threshold correction information for blue. Real time data at 0 volt to
    1 volt.
    GRN_THRESSimilar to BLU_THRES
    RED_THRESSimilar to BLU_THRES 
    						
    							Chapter 2---System Description
    2-34Model 230 Service Manual
    BLU_SENS Sensitivity correction information for BLU. Real time data at O volt to
    1 volt.
    GRN_SENS Similar to BLU_SENS
    RED_SENS Similar to BLU_SENS
    RASTER TIMING GENERATOR
    INPUTS DESCRIPTION
    SOURCE_
    VALIDThis signal indicates a new source (or valid). A high indicates a valid
    stable signal and low indicates change in input signal.
    ODD_FIELD Square wave with 50 % duty cycle which is low during the odd field
    of an interlace signal. This signal is high for noninterlaced signals.
    280_CLK Square wave signal, 50 % duty cycle, 280 times the frequency of
    horizontal sync. This clock is synchronized to the horizontal sync.
    H_DRIVE Square wave 50% duty cycle synchronized to selected horiz sync
    V_DRIVE Square wave negative going pulse synchronized to selected vertical
    sync with pulse width of about 4 horiz lines
    H_F2V DC voltage proportional to horiz frequency
    OUTPUTS DESCRIPTION
    ISYNC_CLK 5 mHz clock used to generate the internal sync signals
    IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous
    data transfer over the IIC bus interface.
    IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer
    between System Controller and RTG.
    CONVERGENCE/DEFLECTION BOARD
    OUTPUTS DESCRIPTION
    IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous
    data transfer over the IIC bus interface.
    IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer
    between the SCB and the Convergence/Deflection board.
    X_RED_
    CONVRed X convergence waveform. The amplitude for full scale
    correction is about 1 VPP.
    X_GRN_
    CONVGrn X convergence waveform. The amplitude for full scale correction
    is about 1 VPP. 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-35
    X_BLU_
    CONVBlu X convergence waveform. The amplitude for full scale correction
    is about 1 VPP.
    Y_RED_
    CONVRed Y convergence waveform. The amplitude for full scale
    correction is about 1 VPP.
    Y_GRN_
    CONVGrn Y convergence waveform. The amplitude for full scale correction
    is about 1 VPP.
    Y_BLU_
    CONVBlu Y convergence waveform. The amplitude for full scale correction
    is about 1 VPP.
    CORR_
    SYNCSquare wave HCT level synchronous signal for horiz axis.
    HORIZONTAL/VERTICAL DEFLECTION BOARD
    OUTPUTS DESCRIPTION
    IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous
    data transfer over the IIC bus interface. 
    						
    							Chapter 2---System Description
    2-36Model 230 Service Manual
    IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer
    between the SCB and the Horizontal/Vertical Deflection board.
    I=Input, O=Output.
    O    V_RED_LIN_CONTROL
    O    V_GRN_LIN_CONTROL
    O    V_BLU_LIN_CONTROL
    O    V_RED_EDGE_CONTROL
    O    V_GRN_EDGE_CONTROL
    O    V_BLU_EDGE_CONTROL
    O    L/R_KEY_CONTROL
    O    L/R_PIN_CONTROL
    O    WIDTH_CONTROL
    O    H_RED_CENT_CONTROL
    O    H_GRN_CENT_CONTROL
    O    H_BLU_CENT_CONTROL
    O    V_RED_CENT_CONTROL
    O    V_GRN_CENT_CONTROL
    O    V_BLU_CENT_CONTROL
    O    FRONT/REAR
    O    FLOOR/CEIL
    HIGH VOLTAGE POWER SUPPLY
    INPUT DESCRIPTION
    /HV_OK The high voltage status line. Low =  operational HVPS.
    LOW VOLTAGE POWER SUPPLY
    INPUTS DESCRIPTION
    + 5.1V Power for digital portion of SCB
    +15V Power for the analog portions of the SCB
    -15V Power for the analog portions of the SCB
    +5.1V_Stby Standby power to the CPU and peripherals.
    /LV_OK Tells SCB status of non-standby supply (all outputs working or not) 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-37
    OUTPUTS DESCRIPTION
    FAN_ENA Signal to enable the 24V standby power
    LV_ENA Signal to enable the LVPS
    ARC LAMP POWER SUPPLY
    INPUTS DESCRIPTION
    /LAMP_OK Informs SCB that the Arc Lamp is installed, temperature is within
    limits, and lamp cooling blower is working
    /LAMP_LIT Informs the SCB that the Arc Lamp is lit or not lit
    OUTPUTS DESCRIPTION
     /LAMP_ENA Enables ALPS power
    PROJECTION LENS
    OUTPUTS DESCRIPTION
    LENS_FOCUSSignal to lens focus motor
    LENS_ZOOM Signal to lens zoom motor
    FRONT IR
    INPUTS DESCRIPTION
    /FRONT_IR Input from front infrared receiver
    /REAR_IR Input from rear infrared receiver
    2.3.7  Raster Timing Generator PCB
    The Raster Timing Generator (RTG) is located in the electronic card cage
    (Figure 5-1). The RTG I/O diagram (Figure 2-13) and the list of inputs and
    outputs (Tables 2-10 and 2-11) provide information to allow the technician to
    perform module level troubleshooting.
    The following functions are provided by RTG board:
    •  Internal sync generation
    •  Sync detection and selection
    •  Serration and equalization pulse removal
    •  Phase locked loop
    •  Blanking pulse generation 
    						
    							Chapter 2---System Description
    2-38Model 230 Service Manual
    •  Horizontal and vertical phase adjustments
    •  Interlace detection and odd field pulse generation
    •  Horizontal frequency band selection
    •  Horizontal line count and vertical count generation
    • IIC interface
    •  Video clamp pulse generation
    •  Source change detection
    •  HVPS sync generation
    •  Horizontal deflection enable circuitry
    The RTG I/O Diagram (Figure 2-13) and the list of inputs and outputs (Tables 2-
    12 and 2-13) provide information for the technician to perform module level
    troubleshooting.
    Horizontal frequency band selection and LED logic.
    The RTG produces a voltage that is proportional to the horizontal frequency
    which is used by the Horiz/Vert Deflection board, System Controller Board, and
    the phase locked loop (PLL) section of the RTG board. This DC voltage is used
    to create the following frequency bands:
    Band A: from 15 KHZ to 24.5 kHZ.
    Band B: from 24 KHZ to 29.5 kHZ
    Band C: from 29 KHZ to 56 kHZ
    Band D: from 55.5 KHZ to 90 kHZ.
    These bands are outputted through the IIC interface to be used by the System
    Controller Board. These lines are also outputs of the RTG board through the
    Backplane Board. The Horizontal/Vertical Deflection Board uses these lines for
    proper selection of retrace times. 
    						
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