Hughes Model 230 Projector 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-