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Hughes JVC Projector 230 Sc Service Manual

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    							Chapter 2---System Description
    Model 230 Service Manual2-9
    Voltage: 20 to 23 VDC to maintain the arc lamp ON.
    Current: 55 to 70 amps to maintain the arc lamp ON.
    LAMP_OUT: Lamp output voltage, positive.
    LAMP_RTN: Lamp return.
    /LAMP_LIT: Signal to SCB that the lamp is lit.
    Operation:
    Two signals (/COVER_ON and /LAMP_OK) are required in order for the arc
    lamp to light. /COVER_ON from the cover interlock switches tells the Arc Lamp
    Power Supply that the covers are in place and the interlock switches are pressed
    down. /LAMP_OK informs the System Controller that the lamp is installed (a
    mechanical switch activates when the lamp is installed) The System Controller
    then sends the /LAMP_ENA signal to the ALPS. The /LAMP_ENA signal turns
    on the ALPS.
    The Arc Lamp Power Supply then provides the +140 VDC boost voltage to a
    spark gap and high voltage transformer which steps up the voltage to
    approximately 32KV and ignites the Xenon Arc Lamp. After the Arc Lamp is lit, it
    is maintained on by the ALPS at a constant 20-23 volts and 55-70 amps. The
    /LAMP_LIT signal output informs the System Controller if the lamp is lit or not.
    The Arc Lamp Power Supply is electrically and magnetically shielded to prevent
    noise or disturbances in the CRTs or other circuitry.
    High Voltage Power Supply (HVPS)
    The High Voltage Power Supply (HVPS) is located on top of the LVPS on the
    right side of projector ( as viewed from rear). This supply provides the anode,
    focus, and screen voltages required for the three CRTs in the Model 230
    projector.
    The following functions are provided by HVPS:
    •  Phase locked loop circuit for synchronization to the horizontal sync
    •  Generation of anode voltages (25 KV) for all three CRTs (RGB)
    •  Generation of focus voltage (G3) for all three CRTs (RGB)
    •  Generation of screen (G2 supply-Black Level) voltage for all three CRTs
    •  Generation of G1 supply (Blanking) voltage
    •  Dynamic focus amplifier using H and V parabolas
    •  External ON/OFF and generation of /HV_OK signal
    The High Voltage Power Supply I/O diagram (Figure 2-5) and the list of inputs
    and outputs (Table 2-1), provide an understanding of the operation of the HVPS
    to allow the technician to perform module level troubleshooting. 
    						
    							Chapter 2---System Description
    2-10Model 230 Service Manual
    ARC GND
    G2 SUPPLY
    G1 SUPPLY 
     /H V  O K    T O   C R T S   V I A   V A B
    R FOCUS  J58-1
    G FOCUS   J59-1
    B FOCUS  J60-1
    T O   C R T S
    R ANODE   J58-1
    G ANODE  J59-1
    B ANODE  J60-1
    T O   C R T S VIA VAB
      H PARABOLA
    FROM CD BOARD
      V PARABOLA  +80V
    FROM LVPS
     +15V
      -15
     /HV ENA (/VA_OK)
      H VPS_SYNC
    FROM  RTG
    J45
    5 11
    J44
    J45
    13 14
    8
    9
    10
    12
    6
    13 (From VPB)
    HIGH
    VOLTAGE
    POWER
    SUPPLY
    Figure 2-5.  High Voltage Power Supply, I/O Diagram
    The HVPS Input/Output
    This section provides a comprehensive description of the inputs to and outputs
    from the HVPS. 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
    HVPS. Output refers to an output from the HVPS. In each case the signals
    direction is noted.
    Table 2-1.  High Voltage Power Supply I/O signals
    RASTER TIMING GENERATOR PCB
    INPUT DESCRIPTION
    HVPS_SYNC Square wave HCT level with 50 or 33% duty cycle synchronized to
    horizontal sync.
    VIDEO PROCESSOR PCB
    INPUT DESCRIPTION
    /HV_ENA The HVPS enable line. A low enable the HVPS (VA_OK from VPB).
    VIDEO AMPLIFIER PCB
    OUTPUTS DESCRIPTION
    G1_SUPPLY DC supply about -150 V for driving the G1 of CRTs
    G2_SUPPLY DC supply about 1.3 KV for driving the G2 of CRTs 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-11
    ARC_GND Return (ground) line for the CRT anodes
    CONVERGENCE/DEFLECTION PCB
    INPUTS DESCRIPTION
    H_
    PARABOLAHorizontal parabola for use by the dynamic focus amplifier
    V_
    PARABOLAVertical parabola for use by the dynamic focus amplifier
    SYSTEM CONTROLLER PCB
    OUTPUT DESCRIPTION
    /HV_OK The high voltage status line. Low = operational HVPS
    LOW VOLTAGE POWER SUPPLY
    INPUTS DESCRIPTION
    + 15V + 15 V for use by the HVPS
    + 80V + 80 V for use by the HVPS
    - 15V - 15V for use by the HVPS
    CRTS
    OUTPUTS DESCRIPTION
    RED_ANODE
    GRN_ANODE
    BLU_ANODEAnode supply for the three CRTs. About 25 KV
    RED_FOCUS
    GRN_FOCUS
    BLU_FOCUSFocus voltage for the three CRTs. About 7 KV
    Interlocks and protection:
    This section describes the interactions between boards where one board may
    cause others to perform protection functions.
    Input
    A high signal at /HV_ENA shuts off the HVPS.
    2.3.3   Video Input Cards
    The four types of Video Input Cards that can be used with the Model 230
    Projector are:
    •  Graphics Enhancer RGB Video Input Card, which is supplied with each
    projector and is used for RGB standard formats
    •  Optional Four Input RGB VIC used in a similar manner as a switcher. 
    						
    							Chapter 2---System Description
    2-12Model 230 Service Manual
    •  Optional HDTV VIC used for High Definition Television.
    •  Optional Quad Standard Decoder VIC used for NTSC, PAL SECAM and
    other composite sources.
    Graphics Enhancer RGB Video Input Card
    The Graphics Enhancer RGB VIC is located at the rear of the projector. It has
    five BNC inputs. It provides the RGB and sync interface for the projector.
    The following functions are provided by the RGB VIC:
    •  Video and sync interface for red, green and blue
    • LED indication
    •  IIC serial bus interface
    RED_VIC
    GRN_VIC
    BLU_VIC
    /SEL_VIC RED
    GREEN
    BLUE
    IIC_CLK
    IIC_DATA
    +5.1V_STBY
    +5.1V
    +15V
    -15VB2
    B4
    B6
    12* B8
    B13
    A13
    A16
    B16
    B15
    B14
    *Pin callouts are to P12, P14, 
    or P18, depending on which
    VIC slot is being used.
    GRAPHIC
    ENHANCER
    H_VIC
    B10V_VIC
    A1      GND
    A2      GND
    A3      GND
    IIC HORIZ
    VERTIIC_INT
    A12
    Figure 2-6.  Graphics Enhancer RGB VIC I/O
    Video and sync interface for red, green and blue
    This RGB VIC provides a high bandwidth interface for the three color video
    signals. The video signals are routed to the Backplane Board without any
    distortion or modification. The sync signals (horizontal and vertical) are also
    directly connected to the Backplane Board.
    LED indication
    The RGB VIC includes an LED which glows when the board is selected (i.e.
    when the /SEL_CH line is low) as the input for the Model 230 Projector.
    IIC serial bus interface section
    The Graphics Enhancer RGB VIC is controlled by the serial bus interface. The
    IIC bus comes from the System Controller Board through the Backplane Board.
    The information transferred over the IIC bus is indicated below (I = input to the
    RGB VIC, and O = output from the RGB VIC). The RGB VIC does not use the
    interrupt line of the IIC bus interface: 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-13
    Table 2-2.  Graphics Enhancer RGB VIC IIC communication
    I/O Bits Information Description
    I 1 /SEL_CH Select line for the Graphics Enhancer RGB
    VIC. Low = Selected RGB VIC.
    O 4 VIC_ID VIC identification lines. 0000 for RGB_VIC.
    O 1 VIC_MODEL Revision of the RGB VIC.
    O 1 /VIC_OK RGB VIC status line. Low = operational RGB
    VIC.
    The Graphics Enhancer RGB_VIC I/O
    This section provides a description of the inputs to and outputs from the
    RGB_VIC. 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 group of signals. Those signals are further
    subdivided into inputs and outputs. Input refers to an Input to the RGB_VIC,
    output refers to an output from the RGB_VIC.
    Table 2-3.  Graphics Enhancer RGB VIC I/O signals
    PROJECTOR INPUTS
    INPUTS DESCRIPTION
    RED
    GREEN
    BLUEVideo input signals. about 0.7 to 1  VPP
    HORIZ. Horizontal or composite sync signal
    VERTICAL Vertical sync signal
    VIDEO PROCESSOR BOARD
    OUTPUTS DESCRIPTION
    /SEL_VIC Select line for VIC. A low indicates the RGB_VIC is selected.
    RED_VIC
    GRN_VIC
    BLU_VICVideo signals. about 0.7 to 1 VPP
    H_VIC Horizontal or composite sync signals
    V_VIC Vertical sync signals 
    						
    							Chapter 2---System Description
    2-14Model 230 Service Manual
    SYSTEM CONTROLLER BOARD
    INPUTS 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 system control board and the RGB_VIC.
    OUTPUTS DESCRIPTION
    /IIC_INT IIC interrupt line. RGB_VIC does not initiate an interrupt.
    LOW VOLTAGE POWER SUPPLY
    INPUTS DESCRIPTION
    +5.1 V +5.1 V supply for use by RGB_VIC.
    +15 V + 15 V supply for use by  RGB_VIC.
    -15 V -15 V supply for use by  RGB_VIC.
    + 5.1 V_stby + 5.1 V stand by supply for use by RGB_VIC.
    Interlocks and protection
    Input:  None
    Outputs:  None
    Quad Input RGB VIC
    The Quad Input RGB VIC consists of four sets of RGBHV inputs and operates in
    a manner similar to a switcher. The four inputs are multiplexed so that only one
    is enabled at a specific time. Software selects the desired input channel through
    the IIC bus and ensures that only one RGB VIC is enabled. When one of the
    channels assigned to the Quad RGB VIC is selected, the /SEL_VIC line to the
    Video Processor is enabled. 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-15
    RED_VIC
    GREEN_VIC
    BLUE_VIC
    H_VIC
    V_VIC
    IIC/SEL_VICIIC_CLK
    IIC_DATA
    IIC_INT
    +5.1Vstby
    +5.1V
    +15V
    -15V
    4:1 
    VIDEO
    MUX
    and
    BUFFERS
    RED_CH1
    RED_CH2
    RED_CH3
    RED_CH4
    GRN_CH1
    GRN_CH2
    GRN_CH3
    GRN_CH4
    BLU_CH1
    BLU_CH2
    BLU_CH3
    BLU_CH4
    HOR_CH1
    HOR_CH2
    HOR_CH3
    HOR_CH4
    VER_CH1
    VER_CH2
    VER_CH3
    VER_CH4
    Figure 2-7.  Quad Input RGB VIC
    The same functions performed by the Graphics Enhancer RGB VIC are
    performed by the Quad Input RGB VIC. The description of operation and pinouts
    are the same as the Graphics Enhancer RGB VIC. One of four LEDs indicates
    which of the four RGB inputs is currently active.
    HDTV YPbPr VIC
    This color decoder video input card (YPbPr_VIC) is located on the back side of
    the projector and contains three BNC input connectors which can be used for
    two different inputs, YPbPr or GBR. This board converts these color component
    signals to RGB type video signals.
    The following functions are provided by YPbPr_VIC:
    •  Video input and output buffers
    •  Conversion of color components signals to RGB video signals
    •  Separation of syncs from the Y/G input signal
    •  Hue, sharpness, gamma, and color adjustment
    •  Selection of RGB input or color component input
    • LED indication 
    						
    							Chapter 2---System Description
    2-16Model 230 Service Manual
    •  IIC serial bus interface
    RED
    GRN
    BLU
    HOR
    /SELECT Y/G
    Pb/B
    Pr/R
    IIC_CLK
    IIC_DATA
    +5.1V_STBY
    +5.1V
    +15V
    -15VB2
    B4
    B6
    B8
    B12 B13
    A13
    A16
    B16
    B15
    B14
    Pin callouts are to P12, P14, 
    or P18, depending on which
    VIC slot is being used.
    Figure 2-8.   HDTV YPbPr VIC Input/Output Diagram.
    This VIC accepts two types of video signals, color components (YPbPr) and
    RGB signals. In either case the output of this VIC is RGB type signals. If the
    inputs are color components they will be converted to RGB type signals.
    The selection between color component input mode and RGB input mode is
    controlled by an input. This input is controlled by the System Controller Board via
    the IIC serial bus interface.
    LED indication
    There are two LEDs on this VIC. The RGB LED glows when the YPbPr_VIC is
    selected and is in RGB input mode. The YPbPr LED glows when the YPbPr_VIC
    is selected and is in YPbPr input mode. Both LEDs are off when the YPbPr_VIC
    is not selected as the input to projector. Only one LED can be on at one time.
    IIC Interface
    The YPbPr_VIC is controlled by the serial bus interface. The IIC bus comes from
    the System Controller Board through the Backplane Board. All required
    adjustments for this board are provided via the IIC serial bus interface. The
    information transferred over the IIC bus is indicated below (I = input to
    YPbPr_VIC, and O = output of YPbPr_VIC). The selection of this VIC is
    accomplished through the IIC control bus which provides the /SEL_VIC signal. 
    						
    							Chapter 2---System Description
    Model 230 Service Manual2-17
    Table 2-4.  HDTV VIC IIC Interface
    I/O BITS INFORMATION DESCRIPTION
    I 1 /SEL_YPbPr Selects YPbPr input mode for the
    YPbPr_VIC.
    Low = Selected YPbPr input mode.
    I 1 /SEL_RGB Selects RGB input mode for the YPbPr_VIC.
    Low = Selected RGB input mode.
    I 8 GAMMA Data for adjustment of Gamma correction
    I 8 COLOR Data for adjustment of color
    I 8 HUE Data for adjustment of hue
    I 8 SHARPNESS Data for adjustment of sharpness
    O 4 VIC_ID VIC identification lines. 0001 for YPbPr_VIC
    O 1 VIC_MODEL Revision of the YPbPr_VIC.
    O 1 /YPbPr_OK YPbPr_VIC status line. Low = operational
    YPbPr_VIC
    The HDTV YPbPr_VIC I/O
    This section provides a comprehensive description of the inputs to and outputs
    from the YPbPr_VIC. 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 group of signals.
    Those signals are further subdivided into inputs and outputs. Input refers to an
    Input to the YPbPr_VIC, output refers to an output from the YPbPr_VIC.
    Table 2-5.  HDTV VIC Signals
    PROJECTOR INPUTS
    INPUT DESCRIPTION
    Y/G
    Pb/B
    Pr/RVideo input signals-about 0.7 to 1 VPP
    VIDEO PROCESSOR BOARD
    OUTPUT DESCRIPTION
    /SELECT Selection indicator for VIC. Low indicates the selected YPbPr_VIC.
    RED
    GRN
    BLUVideo signals. about 0.7 to 1 VPP 
    						
    							Chapter 2---System Description
    2-18Model 230 Service Manual
    HOR Composite horizontal / vertical  sync signal
    SYSTEM CONTROLLER BOARD
    INPUTS 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 system control board and the YPbPr_VIC.
    OUTPUTS DESCRIPTION
    /IIC_INT IIC interrupt line. YPbPr_VIC does not initiate any  interrupt
    LOW VOLTAGE POWER SUPPLY
    INPUTS DESCRIPTION
    +5.1 V +5.1 V supply for use by  YPbPr_VIC.
    +15 V + 15 V supply for use by  YPbPr_VIC.
    -15 V -15 V supply for use by  YPbPr_VIC.
    Interlocks and protection
    Inputs:
    None
    Outputs:
    None
    Quad Standard Decoder VIC
    The Quad Standard Decoder VIC is composite and S-Video interface. It contains
    three BNC input connectors for Composite Video and S-Video (luminance and
    chrominance). This decoder VIC converts these color component signals to
    RGBHV type video signals.
    The following functions are provided by the Quad Standard Decoder VIC:
    •  Select input source-Composite or S-video
    • Select standard-AUTO/NTSC/PAL/SECAM/4.43NTSC
    •  Conversion of composite and S-video signals to RGB video signals
    •  Separation of syncs from the input signal
    •  Tint, sharpness, and color adjustment
    •  LED indication of Composite or S-video
    •  IIC serial bus interface 
    						
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