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Hughes JVC Projector 230 Sc Service Manual

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    							Chapter 2---System Description
    Model 230 Service Manual2-49
    • ILA® assembly driver circuitry with temperature compensation
    •  Phase locked loop for ILA
    ® assembly drivers
    •  IIC serial bus interface
    The Convergence/Deflection Input/Output diagram (Figure 2-15) and the list of
    inputs and outputs (Tables 2-16 and 2-17) provide information for the technician
    to perform module level troubleshooting.
    IIC_CLK
    IIC_DATA
    /IIC_SINT
    X_RED_CONV
    X_GRN_CONV
    X_BLU_CONV
    Y_RED_CONV
    Y_GRN_CONV
    Y_BLU_CONV
    V_DRIVE
    CORR_SYNC
    WIDTH_CONTROL
    RED_ILA+
    RED_ILA-
    GRN_ILA+
    GRN_ILA-
    BLU_ILA+
    BLU_ILA-
    X_RED-
    X_GRN+
    X_GRN-
    X_BLU+
    X_BLU-
    X_RED+
    Y_RED-
    Y_GRN+
    Y_GRN-
    Y_BLU+
    Y_BLU-Y_RED+
    H_PARABOLA
    V_PARABOLA
    V_RAMP
    V_PARAB 2
    3
    4
    2
    4
    6
    8
    10
    12
    17 18
    5
    J33
    J31
    J32
    5+5.1V
    66ND
    7+15V
    9GND
    11 -15V
    13 GNDJ32
    14
    15
    J331
    3
    J31
    J401
    2
    3
    4
    5
    6
    J391
    2
    3
    4
    5
    6
    J381
    2
    4
    5
    7
    81GND
    13
    GND
    2
    GND 1
    GND
    GND
    16
    FROM
    SCB
    FROM RTG
    FROM
    LVPS
    TO
    HVPS
    FROM
    HVDB TO/FROM
    SRB TO/FROM
    SRBTO
    ILAs
    FROM HVDB
    CONVERGENCE/
    DEFLECTION
    BOARD
    FROM
    SCB
    Figure 2-15.   Convergence/Deflection Board I/O diagram.
    IIC interface
    Adjustments for this board are performed by the System Controller via the IIC
    serial bus interface. This three wire bus interface consists of a clock line, a data
    line and an interrupt line. The C/D Board does not create any IIC interrupt. The
    following table lists all adjustments performed via the IIC bus interface (I = Input
    to C/D Board, O = Output from C/D Board): 
    						
    							Chapter 2---System Description
    2-50Model 230 Service Manual
    Table 2-16.  Convergence/Deflection IIC communication
    INPUT/
    OUTPUTNO.
    OF
    BITSINFORMATION DESCRIPTION
    I 1 ILA_FREQ_N1 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N2 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N3 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N4 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N5 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N6 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N7 Data for selection of frequency of ILA bias circuit
    I 1 ILA_FREQ_N8 Data for selection of frequency of ILA bias circuit
    I 8 ILA_RED_BIAS Data for adjustment of red ILA bias
    I 8 ILA_GRN_BIAS Data for adjustment of green ILA bias
    I 8 ILA_BLU_BIAS Data for adjustment of  blue ILA bias
    I 1 ILA_FREQ_M1 Data for selection of frequency of ILA bias circuit
    (pre-scale counter)
    I 1 ILA_FREQ_M2 Data for selection of frequency of ILA bias circuit
    (pre-scale counter)
    I8LR_RED_SKEWData for adjustment of red left/right skew
    I8LR_GRN_SKEWData for adjustment of green left/right skew
    I8LR_BLU_SKEWData for adjustment of blue left/right skew
    I 8 LR_BOW Data for adjustment of left/right bow
    I 8 HEIGHT Data for adjustment of height for all colors
    I 8 LR_KEY_BAL Data for adjustment of left/right keystone
    balance
    I 8 LR_PIN_BAL Data for adjustment of left/right pincushion
    balance
    I 8 H_RED_LIN Data for red horizontal overall linearity correction
    I 8 H_GRN_LIN Data for green horizontal overall linearity
    correction
    I 8 H_BLU_LIN Data for blue horizontal overall linearity
    correction 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-51
    I 8 H_RED_
    EDGE_LINData for red horizontal edge linearity correction
    I8H_GRN
    _EDGE_LINData for green horizontal edge linearity
    correction
    I8H_BLU
    _EDGE_LINData for blue horizontal edge linearity correction
    I 8 TP_RED_SKEW Data for adjustment of red top/bottom skew
    I 8 TP_GRN_SKEW Data for adjustment of green top/bottom skew
    I 8 TP_BLU_SKEW Data for adjustment of blue top/bottom skew
    I 8 TP_BOW Data for adjustment of top/bottom bow
    I 8 TP_PIN Data for adjustment of top/bottom pincushion
    I 8 TP_PIN_BAL Data for adjustment of top/bottom pincushion
    balance
    I 8 TP_KEY Data for adjustment of top/bottom keystone
    I 8 TP_KEY_BAL Data for adjustment of top/bottom keystone
    balance
    I 1 /RASTER_FIL Control line for the raster fill option, low = raster
    fill is active
    I 1 /CONV_ENABLE Convergence enable line low = enabled
    convergence
    O 1 ILA_LOCKED Status line for the lock indication of the PLL of
    the ILA section with high = locked PLL
    O 1 /CD_OK Convergence board status line. Low =
    operational C/D Board, High = Nonoperational
    C/D Board.
    O 2 CD_MODEL Revision of C/D Board
    The Convergence/Deflection Board I/O
    This section describes the inputs to and outputs from the C/D Board. The I/O
    descriptions are arranged by the source and destination of the signal. The
    assembly communicated with is the primary heading of each group of signals.
    Those signals are subdivided into inputs and outputs. Input refers to an Input to
    the C/D Board, output refers to an output from the C/D Board.
    Table 2-17.  Convergence Deflection I/O signals
    SYSTEM CONTROLLER BOARD
    INPUTS DESCRIPTION
    IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous
    data transfer over the IIC bus interface. 
    						
    							Chapter 2---System Description
    2-52Model 230 Service Manual
    IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer
    between the System Controller Board and the C/D Board.
    X_RED_
    CONVRed X convergence waveform. The amplitude for full scale
    correction is about 1 VPP.
    X_GRN_
    CONVGreen X convergence waveform. The amplitude for full scale
    correction is about 1 VPP.
    X_BLU_
    CONVBlue 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_
    CONVGreen Y convergence waveform. The amplitude for full scale
    correction is about 1 VPP.
    Y_BLU_
    CONVBlue Y convergence waveform. The amplitude for full scale
    correction is about 1 VPP.
    CORR_
    SYNCSquare wave HCT level synchronization signal for horizontal axis
    OUTPUTS DESCRIPTION
    /IIC_SINT IIC interrupt line. Convergence board does not initiate any IIC
    interrupt.
    ILAS
    OUTPUTS DESCRIPTION
    RED_ILA+ The positive output of red ILA driver circuitry, about ± 12 VPP
    RED_ILA- The negative output of red ILA driver circuitry, about ± 12 VPP
    GRN_ILA+ The positive output of green ILA driver circuitry, about ± 12 VPP
    GRN_ILA- The negative output of green ILA driver circuitry, about ± 12 VPP
    BLU_ILA+ The positive output of blue ILA driver circuitry, about ± 12 VPP
    BLU_ILA- The negative output of blue ILA driver circuitry, about ± 12 VPP
    ILA_THERM+The positive side of the ILA temperature sense line
    ILA_THERM-The negative side of the ILA temperature sense line
    SCAN REVERSAL BOARD
    INPUTS DESCRIPTION
    X_RED- Current feedback of red horizontal (X) convergence amplifier
    X_GRN- Current feedback of green horizontal (X) convergence amplifier 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-53
    X_BLU- Current feedback of blue horizontal (X) convergence amplifier
    Y_RED- Current feedback of red vertical (Y) convergence amplifier
    Y_GRN- Current feedback of green vertical (Y) convergence amplifier
    Y_BLU- Current feedback of blue vertical (Y) convergence amplifier
    OUTPUTS DESCRIPTION
    X_RED+ Output of red horizontal (X) convergence amplifier
    X_GRN+ Output of green horizontal (X) convergence amplifier
    X_BLU+ Output of blue horizontal (X) convergence amplifier
    Y_RED+ Output of red vertical (Y) convergence amplifier
    Y_GRN+ Output of green vertical (Y) convergence amplifier
    Y_BLU+ Output of blue vertical (Y) convergence amplifier
    HORIZONTAL/VERTICAL DEFLECTION BOARD
    INPUTS DESCRIPTION
    WIDTH_
    CONTROLA DC wave form for controlling width of picture. About 4 V max.
    OUTPUTS DESCRIPTION
    V_PARAB Vertical parabola wave form. About 4 VPP.
    V_RAMP Vertical ramp wave form. About  4 VPP.
    RASTER TIMING GENERATOR BOARD
    INPUTS DESCRIPTION
    V_DRIVE Square wave HCT level synchronized to vertical sync with 4H duty
    cycle.
    HIGH VOLTAGE POWER SUPPLY
    OUTPUTS DESCRIPTION
    H_
    PARABOLAHorizontal parabola for dynamic focus section of High Voltage Power
    Supply
    V_
    PARABOLAVertical parabola for dynamic focus section of High v\Voltage Power
    Supply
    LOW VOLTAGE POWER SUPPLY
    INPUTS DESCRIPTION 
    						
    							Chapter 2---System Description
    2-54Model 230 Service Manual
    +5.1 V + 5 V supply for use by convergence board.
    +15 V + 15 V supply for use by convergence board.
    -15 V - 15 V supply for use by convergence board.
    Interlocks and protection
    None
    2.3.10 Scan Reversal Board
    The Scan Reversal Board (SRB) is mounted vertically on the right side of the
    card cage.
    The following functions are provided by the SRB:
    •  Reversal of scan in both horizontal and vertical axes
    •  Horizontal width adjustment for each color (R, G &B)
    •  Horizontal current feedback
    •  Scan failure detection for all six main (horizontal and vertical)
    deflection amplifiers
    The Scan Reversal Board Input/Output diagram (Figure 2-16) and the list of
    inputs and outputs (Table 2-19) provide information for the technician to perform
    module level troubleshooting. Table 2-18 shows the signal states for modes of
    projector operation.
    The SRB does not require any IIC bus interface.
    Table 2-18.  Scanning signal states
    MODE OF OPERATION FRONT/REAR
    LINEFLOOR/CEIL
    LINE
    Front and floor projection Low Low
    Front and ceiling projection Low High
    Rear and floor projection High Low
    Rear and ceiling High High 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-55
    Figure 2-16.   Scan Reversal Board, Input/Output Diagram.
    Scan Reversal Board I /O
    This section describes the inputs to and outputs from the SRB. The I/O
    descriptions are arranged by the source/destination of the signal. The assembly
    communicated with is the primary heading of each group of signals. Those
    signals are subdivided into inputs and outputs. Input refers to an Input to the
    Scan Reversal Board. Output refers to an output from the Scan Reversal Board. 
    						
    							Chapter 2---System Description
    2-56Model 230 Service Manual
    Table 2-19.  Scan Reversal Board I/O signals
    HORIZONTAL / VERTICAL DEFLECTION BOARD
    INPUTS DESCRIPTION
    H_OUT_
    FLYBACKHorizontal output flyback pulse, about 800 VPP
    H_LOCK+ Horizontal interlock for yoke connectors. This should be about 5
    V when closed or 15 V when open.
    H_RED+ Output of horizontal red centering (also top of the red horiz
    yoke). About + 5 Vdc.
    H_GRN+ Output of horizontal green centering (also top of the green horiz
    yoke). About + 5 Vdc.
    H_BLU+ Output of horiz. blue centering (also top of the blue horiz yoke).
    About + 5 Vdc.
    V_RED+ Output of red vertical amplifier. about 40 VPP
    V_GRN+ Output of green vertical amplifier. about 40 VPP
    V_BLU+ Output of blue vertical amplifier. about 40 VPP
    +15 V +15 volt supply for use by SRB
    +5 V +5 volt supply for use by SRB
    -15 V -15 V supply for use by SRB
    OUTPUTS DESCRIPTION
    H_LOCK- Horizontal interlock for yoke connectors. It should be 5 V when
    closed or 0 V when open.
    V_RED-
    V_RED_SENSCurrent feedback of red vertical amplifier
    V_GRN-
    V_GRN_SENSCurrent feedback of green vertical amplifier
    V_BLU-
    V_BLU_SENSCurrent feedback of blue vertical amplifier
    FRONT/REAR Front or rear projection status line.   Front = low and rear = high
    FLOOR/CEIL Floor or ceiling status line.  Floor = low  and ceiling = high
    H_CUR_FDBK Horizontal current feed back, a DC signal proportional to horz.
    output current
    DEFL_OK Deflection status line  high (about 2 V) = good  low = no scan 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-57
    CONVERGENCE/DEFLECTION BOARD
    INPUTS DESCRIPTION
    X_RED+ Output of horizontal red convergence amplifier
    X_GRN+ Output of horizontal green convergence amplifier
    X_BLU+ Output of horizontal blue convergence amplifier
    Y_RED+ Output of vertical red convergence amplifier
    Y_GRN+ Output of vertical green convergence amplifier
    Y_BLU+ Output of vertical blue convergence amplifier
    OUTPUTS DESCRIPTION
    X_RED- Current feedback of horizontal red convergence amplifier
    X_GRN- Current feedback of horizontal green convergence amplifier
    X_BLU- Current feedback of horizontal blue convergence amplifier
    Y_RED- Current feedback of vertical red convergence amplifier
    Y_GRN- Current feedback of vertical green convergence amplifier
    Y_BLU- Current feedback of vertical blue convergence amplifier
    RED YOKE CONNECTOR
    NAME DESCRIPTION
    H_RED_YOK+ Top of red horizontal yoke
    H_RED_YOK- Bottom of red horizontal yoke
    RED_LOCK+ Interlock for red yoke. 5 V when closed or 15 V when open.
    RED_LOCK- Interlock for red yoke. 5 V when closed or 0 V when open.
    V_RED_YOK+ Top of red vertical yoke
    V_RED_YOK- Bottom of red vertical yoke
    X_RED_YOK+ Top of red horizontal convergence yoke
    X_RED_YOK- Bottom of red horizontal convergence yoke
    Y_RED_YOK+ Top of red vertical convergence yoke
    Y_RED_YOK- Bottom of red vertical convergence yoke 
    						
    							Chapter 2---System Description
    2-58Model 230 Service Manual
    GREEN YOKE CONNECTOR
    NAME DESCRIPTION
    H_GRN_YOK+ Top of green horizontal yoke
    H_GRN_YOK- Bottom of green horizontal yoke
    GRN_LOCK+ Interlock for green yoke. 5 V when closed or 15 V when open.
    GRN_LOCK- Interlock for green yoke . 5 V when closed or 0 V when open.
    V_GRN_YOK+ Top of green vertical yoke
    V_GRN_YOK- Bottom of green vertical yoke
    X_GRN_YOK+ Top of  green horizontal convergence yoke
    X_GRN_YOK- Bottom of green horizontal convergence yoke
    Y_GRN_YOK+ Top of green vertical convergence yoke
    Y_GRN_YOK- Bottom of green vertical convergence yoke-
    BLUE YOKE CONNECTOR
    NAME DESCRIPTION
    H_BLU_YOK+ Top of blue horizontal yoke
    H_BLU_YOK- Bottom of blue horizontal yoke
    BLU_LOCK+ Interlock for blue yoke. 5 V when closed or 15 V when open.
    BLU_LOCK- Interlock for blue yoke . 5 V when closed or 0 V when open.
    V_BLU_YOK+ Top of blue vertical yoke
    V_BLU_YOK- Bottom of blue vertical yoke
    X_BLU_YOK+ Top of  blue horizontal convergence yoke
    X_BLU_YOK- Bottom of blue horizontal convergence yoke
    Y_BLU_YOK+ Top of blue vertical convergence yoke
    Y_BLU_YOK- Bottom of blue vertical convergence yoke- 
    						
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