Hughes JVC Projector 230 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...
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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...
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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...
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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...
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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...
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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...
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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....
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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...
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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...
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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...