Hughes JVC Projector 230 Service Manual
Have a look at the manual Hughes JVC Projector 230 Service Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 14 Hughes JVC manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
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