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Hughes JVC 220, Service Manual

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Chapter 2---System Description 

2.4   Image Light Amplifier Technology 

Section 2.2 explained how the various units, including the 

ILA

®

 

assemblies, in the Optical System work together to produce the 
image on the screen. This section focuses mainly on how the 

ILA

®

 

assembly itself works. 

An Image Light Amplifier (

ILA

®

) assembly (

Figure 2-18

) is a 

device that uses low-intensity images to modulate a high-intensity 
light through a liquid crystal layer. It is the key component in 
producing very bright, high resolution images from Hughes-JVC 
large-screen projectors.  

 

Figure 2-18.

  The Hughes-JVC Image Light Amplifier

®

. 

Optically, there are two sides to an 

ILA

®

 assembly with a light 

blocking layer in the center. On the input side there is a photo-
conductive layer where the image from a CRT is focused through 
a relay lens. This image is electrostatically coupled through the 
light-blocking layer and mirror to a liquid crystal layer on the output 
side of the 

ILA

®

 assembly.  

2-60

 

Model 220 Service Manual

 

Summary of Contents for 220

Page 1: ...SERVICE MANUAL Model 220 Projector ...

Page 2: ... Class A In addition the above product complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC 104346 First Edition November 1996 Confidential and proprietary information Copyright 1993 by Hughes JVC Technology Corporation All worldwide rights reserved This manual was produced by Hughes JVC Technology Corporation and may be revised without prior notic...

Page 3: ...11 3 10 Vertical and Horizontal Size Settings 3 13 3 11 Software Updating 3 14 3 12 Cleaning Lenses ILA Assemblies and Mirrors 3 18 Chapter 4 Maintenance Removal Replacement 4 1 Introduction 4 1 4 2 Projector Covers 4 4 4 3 Air Filters 4 5 4 4 Arc Lamp Assembly 4 5 4 5 Ignitor Assembly 4 7 4 6 Arc Lamp Power Supply 4 8 4 7 Low Voltage Power Supply 4 9 4 8 High Voltage Power Supply 4 10 4 9 Raster ...

Page 4: ...PCB Status LEDs 5 1 Error Codes 5 4 Troubleshooting Guide 5 6 Chapter 6 Parts List 6 1 Appendix A Import Export A 1 Appendix B Glossary B 1 Model 220 Service Manual iv ...

Page 5: ...INGS AND CAUTIONS Warnings and Cautions in this manual should be read thoroughly and strictly adhered to Warning and Caution definitions and symbols are as follows WARNING SYMBOL Warns user of a potential electric shock hazard in a procedure or situation that could result in personal injury if improperly performed CAUTION SYMBOL Warns user of a potential safety hazard or potential light hazard fro...

Page 6: ...se severe damage to the projector If there is any visible damage to the power cable disconnect power to the projector until the damaged cable is replaced Install the projector on a smooth vibration resistant level surface or ceiling mount in an area free from dust and moisture Do not place the equipment in direct sunlight or near heat radiating appliances Smoke steam and exposure to direct sunligh...

Page 7: ...stance when the projector is on Direct exposure to light of this brightness can cause severe eye injury Dangerous levels of ultraviolet and infrared radiation dangerous glare very high temperatures 180 C to 300 C and high internal gas pressure are present at the Xenon Arc Lamp The lamp is contained in a protective reflector housing module and should not be operated outside this housing or outside ...

Page 8: ... Focus CRT Mechanical Focus CRT rotation width adjustment or ILA Overlap adjustment always use an ANSI ASTM 10 000 volt rated glove Periodically check the condition of the gloves for cracks Power Supply The projector operates from a 100V 240V 20 Amp single phase 50 60 Hz AC power source Ensure local power source matches these requirements before operating For continued safe and reliable operation ...

Page 9: ...equate cooling of the projector Section 4 3 Ensure that all vent ports are clear of obstructions Keep the inside of the projector free from foreign objects such as hairpins nails paper etc Do not attempt to retrieve any object or insert metal objects such as wire and screwdrivers inside the unit If an object falls inside the projector immediately unplug the projector and call a Hughes JVC certifie...

Page 10: ...Safety Information Model 220 Service Manual x ...

Page 11: ...anual before performing any adjustments or maintenance When performing procedures that call for projector s power to be on always wear high voltage gloves ANSI ASTM 10 000 volt rated when working around the CRTs Arc Lamp or power supplies Wear safety goggles rated X5 when working anywhere near the light path from the Arc Lamp or the projection lens at all times 1 2 Updates Hughes JVC will periodic...

Page 12: ...r Supply CDB Convergence Deflection Board CH Channel CPU Central Processing Unit CRT Cathode Ray Tube EMI Electromagnetic Interference FLASH Erasable Programmable Read Only Memory EPROM FPGA Field Programmable Gate Array F to V Frequency to Voltage G2 CRT Grid 2 HVDB Horizontal Vertical Deflection Board HDTV High Definition Television Hz Hertz HSYNC Horizontal Sync HVDB Horizontal Vertical Deflect...

Page 13: ...ntroller Board SECAM Sequential couleur a memoire sequencial color with memory SRB Scan Reversal Board SYNC Synchronization TTL Transistor Transistor Logic UL Underwriter Laboratories UV Ultraviolet VAB Video Amplifier Board VCO Voltage Controlled Oscillator VIC Video Input Card VIN Video Input VPB Video Processor Board VSYNC Vertical Sync VTR Video Tape Recorder YC Luminance Chrominance Model 220...

Page 14: ...Chapter 1 Introduction 1 4 Model 220 Service Manual ...

Page 15: ...lies and components in the Model 220 projector are contained mainly in the five sections below The Optics Assembly Section is located at the front area of the projector The Optics Assembly Section includes the Cold Mirror IR Filter CAUTION The term cold mirror is used because the mirror passes infrared light and its reflection contains only cold light that does not transmit appreciable heat As a r...

Page 16: ...l to form three single color images The light is then recombined at the 4P combining prism and transmitted through the projection lens to the projector screen The explanation below is divided into two sections The first section follows the image path from the CRT to the projector screen The second section follows the high intensity light path from the Arc Lamp Ignitor to the ILA assemblies where i...

Page 17: ...eflects from the prism into the ILA assembly then back out again after being modulated by the image signal into vertically polarized light The vertically polarized light then passes through the prism to the projector lens In this manner the ILA assembly combines the image from the CRT with the high intensity light from the arc lamp Thus the maximum brightness of the screen image is not dependent o...

Page 18: ...r the arc lamp ignites it is maintained ON by high current and low voltage approximately 47 5 amps and 20 volts The Ignitor and Laser Power Supply are mounted on the base next to the arc lamp WARNING The Xenon Arc Lamp produces high intensity white ultraviolet and infrared light capable of severe eye injury Never look directly at or touch the Xenon Arc Lamp Service should be performed by Hughes JV...

Page 19: ...rror in the Dichroic Mirror Assembly reflects blue light to the blue ILA assembly the second mirror reflects green light to the green ILA assembly and the third reflects red light to the red ILA assembly Thus each ILA is sent only one color of light Prepolarizers and Polarizing Prisms Each individual light beam is polarized directed toward its own Polarizing Prism where it is directed toward the o...

Page 20: ...Chapter 2 System Description Figure 2 1 Optical System Block Diagram 2 6 Model 220 Service Manual ...

Page 21: ...the technician with an overall grasp of how the system works and how each assembly works with other assemblies in the system second to provide the technician with enough information to troubleshoot to the assembly level if needed Figure 2 2 provides an overall System Block Diagram to show how the Optical System Arc Lamp and Electronics System combine to provide the bright screen image VIDEO INPUT ...

Page 22: ... low voltages needed by the projector Provide standby power when the projector is OFF Provide power for all cooling fans Inputs The Low Voltage Power Supply receives AC input power directly from the power source The input range is from 100 VAC to 240 VAC at 50 or 60 Hz LV_ENA Enabling signal from the System Controller Enables the LVPS when the System Controller receives a Power On command FAN_ENA ...

Page 23: ...d on by the remote control or a PC All other voltages supplied by the LVPS are activated when power is turned on at the remote or PC These include 5 1V for digital components 6 2V for CRT filaments 15V for analog circuits and the 80V supply which is used by the High Voltage Power Supply Video Amplifier PCB and the Horizontal Vertical Deflection PCB Arc Lamp Power Supply ALPS P71 P74 1 3 5 AC INPUT...

Page 24: ...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 steady 20 volts and 47 5 a...

Page 25: ... 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 V IA V A B H PARABOLA F R O M C D B O A R D V PARABOLA 80V F R O M L V P S 15V 15 HV ENA VA_OK H VPS_SYNC F R O M R T G J45 5 11 J44 J45 1 3 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 ...

Page 26: ...1 of CRTs G2_SUPPLY DC supply about 1 3 KV for driving the G2 of CRTs ARC_GND Return ground line for the CRT anodes CONVERGENCE DEFLECTION PCB INPUTS DESCRIPTION H_ PARABOLA Horizontal parabola for use by the dynamic focus amplifier V_ PARABOLA Vertical parabola for use by the dynamic focus amplifier SYSTEM CONTROLLER PCB OUTPUT DESCRIPTION HV_OK The high voltage status line Low operational HVPS L...

Page 27: ... are Standard 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 Optional HDTV VIC used for High Definition Television Optional Quad Standard Decoder VIC used for NTSC PAL SECAM and other composite sources Standard RGB Video Input Card RGB_VIC The RGB Video Input Card RGB_VIC is located ...

Page 28: ...ne 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 220 Projector IIC serial bus interface section The 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 inpu...

Page 29: ... 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_VIC Video signals about 0 7 to 1 VPP H_VIC Horizontal or composite sync signals V_VIC Vertical sync signals SYSTEM CONTROLLER BOARD INPUTS DESCRIPTION IIC_CLK IIC clock line Unidirectional clock li...

Page 30: ...hannel 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 RED_VIC GREEN_VIC BLUE_VIC H_VIC V_VIC IIC SEL_VIC IIC_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...

Page 31: ... 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 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 15V B2 B4 B6 B8 B12 B13 A13 A16 B16 B15 B14 Pin callouts are to P12 P14 or P18 depending on...

Page 32: ...d O output of YPbPr_VIC The selection of this VIC is accomplished through the IIC control bus which provides the SEL_VIC signal 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...

Page 33: ...posite 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 ...

Page 34: ...t 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 R G B H SELECT Comp Y in C in IIC_CLK IIC_DATA 5 1V 15V B2 B4 B6 B8 B12 B13 A13 B16 B15 Pin callouts are to P12 P14 or P18 depending on which VIC slot is...

Page 35: ...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 Table 2 6 Quad Standard Decoder VIC IIC Interface I O Information Description I SOURCE Selects input source Composite Video or S...

Page 36: ...an Input to the VIC output refers to an output from the VIC Table 2 7 Quad Standard Decoder VIC Signals PROJECTOR INPUTS INPUT DESCRIPTION Composite V Video input signals about 0 7 to 1 VPP S Video Video input signal about 0 7 to 1 VPP for Luminance and about 3 6 VPP for Chrominance Burst VIDEO PROCESSOR BOARD OUTPUT DESCRIPTION SELECT Selection indicator for VIC Low indicates the Quad VIC is sele...

Page 37: ...Green Sync signals to the Raster Timing Generator RTG board It also provides three primary color signals and G2 G1 bias and DC RESTORE control signals to the Video Amplifier Board VAB The following functions are provided by the VPB Video signal input and multiplexing Sync signal stripping Overlay signal multiplexing Brightness and Contrast control and DC RESTORE Video signal gamma correction Sensi...

Page 38: ...A2 SEL_VIC 1 B1 SEL_VIC 2 GRN_VIDEO B4 RED_VIDEO B2 BLU_VIDEO B6 V_SYNC A16 H_SYNC A17 GRN_SYNC B17 GRN INPUT A28 A1 SEL_VIC 3 B32 RED_OVER B31 GRN_OVER B30 BLU_OVER J17 J16 J16 EXTERNAL VIDEO FROM SCB FROM RTG FROM SCB FROM TO VAB FROM LVPS TO RTG TO VAB TO VAB TO VAB VIDEO PROCESSOR BOARD Figure 2 10 Video Processor I O Diagram IIC Interface The VPB communicates with the SCB via the IIC bus The ...

Page 39: ...n Table 2 9 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 Inputs refers to an input to the VPB while output refers to an output from the VPB Table 2 9 Video Processor I O signals SYSTEM CONTROLLER BOARD INPUT DESCRIP...

Page 40: ...ata transfer over IIC bus IIC_INT Interrupt output to SCB RASTER TIMING GENERATOR INPUT DESCRIPTION CLAMP Pulse signal input from the RTG board Indicates the commanded timing and duration of the DC RESTORE BLANKING Pulse signal input from the RTG board Indicates the commanded BLANKING interval during the scan OUTPUT DESCRIPTION H_SYNC Horizontal sync signal to RTG board V_SYNC Vertical sync signal...

Page 41: ...gnal GRN_G2 Similar to RED_G2 BLU_G2 Similar to RED_G2 G1_BIAS Control the adjustment of G1 voltage for all three CRTs EXTERNAL VIDEO INPUT DESCRIPTION RED_VIC 1 Red video input from video input card 1 GRN_VIC 1 Similar to RED_VIC 1 BLU_VIC 1 Similar to RED_VIC 1 RED_VIC 2 Similar to RED_VIC 1 GRN_VIC 2 Similar to RED_VIC 1 BLU_VIC 2 Similar to RED_VIC 1 RED_VIC 3 Similar to RED_VIC 1 GRN_VIC 3 Si...

Page 42: ...ach for red green and blue The outputs from these video amplifiers connect directly to the CRTs and provide all electrical connections to the CRTS except for the anode voltages The following functions are provided by VAB Amplification of video signals and driving the cathode of all three CRTs Sensing the cathode beam current for all three CRTs G1 regulator for all three CRTs Blanking drive section...

Page 43: ...uts RED_G2 GRN_G2 and BLU_G2 The G2 voltage of each CRT is adjusted individually by using these control lines This adjustment provides black level control The G2 output voltages are pulled down during shutdown mode RED_VIDEO GRN_VIDEO BLU_VIDEO BLANKING G1 SUPPLY G1 BIAS RESTORE ARC_GND BLU_CATHODE 8 BLU_GRID1 9 BLU_GRID2 10 BLU_BEAM 16 BLU_HEAT 7 BLU_HEAT 6 ARC_GND 3 GRN _CATHODE 8 GRN _GRID1 9 G...

Page 44: ...scriptions are arranged by the source destination of the signal The assembly communicated with is used as the primary heading of each group of signals Those signals are subdivided into inputs and outputs Input refers to an Input to the VAB output refers to an output from the VAB Table 2 10 Video Amplifier I O signals VIDEO PROCESSOR BOARD INPUTS DESCRIPTION RED_VIDEO GRN_VIDEO BLU_VIDEO Video prea...

Page 45: ...lector low good deflection RASTER TIMING GENERATOR BOARD INPUTS DESCRIPTION BLANKING Blanking signal logic F type CRTS OUTPUTS DESCRIPTION RED_FOCUS GRN_FOCUS BLU_FOCUS Focus supply of CRTs about 7 KV RED_GRID1G RN_GRID1BL U_GRID1 Grid 1 G1 signal of CRTs RED_HEAT GRN_HEAT BLU_HEAT Positive side of the heater voltage for CRTs About 6 2 V RED_HEAT GRN_HEAT BLU_HEAT Negative side return line of the ...

Page 46: ...ter generation circuits and to control the input output of power supply operation The SCB sets the operating parameters of the image such as brightness and contrast It also produces internal test patterns and generates on screen display overlays The SCB sets the timing for the raster generation to adjust phase geometric corrections shading corrections and convergence The program memory and the mem...

Page 47: ... system status LEDs Green indicates normal yellow is standby and red indicates a fault condition External Service Mode switch see Figure 5 1 Pressing this switch during a power up sequence brings the system up in a diagnostic mode for maintenance rather than a normal operating mode The SCB I O diagram Figure 2 12 and the list of Inputs and Outputs Table 2 11 provide information for the technician ...

Page 48: ...D TO PROJ LENS FROM LVPS FROM HVPS FROM ALPS FROM RTG FROM LVPS TO VPB TO CDB TO VPB H_F2V Figure 2 12 System Controller Board Block Diagram IIC Interface Communications are performed through the IIC bus to the other PCBs in the system This three wire bus interface consists of clock line data line and interrupt line Data transferred over the IIC bus is listed in Table 2 9 I O signals System Contro...

Page 49: ...N_CONT O BLU_CONT O BRIGHTNESS O RED_G2 O BLU_G2 O GRN_G2 O WHT_BOOST O BLK_BOOST OUTPUTS DESCRIPTION OVERLAY Overlay control signal IIC_INT IIC interrupt line RED_OVER Red signal of on screen menu and or internal test pattern GRN_OVER Similar to RED_OVER BLU_OVER Similar to RED_OVER BLU_THRES Threshold correction information for blue Real time data at 0 volt to 1 volt GRN_THRES Similar to BLU_THR...

Page 50: ...ontrol of synchronous data transfer over the IIC bus interface IIC_DATA IIC data line Bidirectional serial line for synchronous data transfer between System Controller and RTG CONVERGENCE DEFLECTION BOARD OUTPUTS 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 synch...

Page 51: ...ONTROL 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 V_RED_CENT_CONTROL O V_GRN_CENT_CONTROL O V_BLU_CENT_CONTROL O FRONT REAR O FLOOR CEIL HIGH VOLTAGE POWER SUPPLY INPUT DESCRIPTION HV_OK The high voltage status line Low operational HVPS LOW VOLTAGE POWER SUPPLY INPUTS DESCRIPTION 5 1V Power for digital p...

Page 52: ...nput from rear infrared receiver 2 3 7 Raster Timing Generator PCB The Raster Timing Generator RTG is located in the electronic card cage Figure 5 1 The RTG I O diagram Figure 2 13 and the list of inputs and outputs Tables 2 10 and 2 11 provide information to allow the technician to perform module level troubleshooting The following functions are provided by RTG board Internal sync generation Sync...

Page 53: ... horizontal frequency which is used by the Horiz Vert Deflection board System Controller Board and the phase locked loop PLL section of the RTG board This DC voltage is used to create the following frequency bands Band A from 15 KHZ to 24 5 KHZ Band B from 24 KHZ to 29 5 KHZ Band C from 29 KHZ to 56 KHZ Band D from 55 5 KHZ to 90 KHZ These bands are outputted through the IIC interface to be used b...

Page 54: ...e locked loop IIC Interface The RTG board uses the IIC bus interface for serial communication with the System Controller Board The information transferred over the IIC bus is indicated below I input to RTG O output from RTG The RTG board does not use the interrupt line of IIC bus interface Table 2 12 Raster Timing Generator IIC communication Input Output No of bits Information Description I 1 FORC...

Page 55: ...h output Input refers to an input to the RTG output refers to an output from the RTG Table 2 13 Raster Timing Generator I O signals SYSTEM CONTROLLER BOARD INPUTS DESCRIPTION ISYNC_CLK 5 mHz clock used to generate the internal sync signals IIC_CLK IIC clock line Unidirectional clock line for control of synchronous data transfer over the IIC bus interface IIC_DATA IIC data line Bi directional seria...

Page 56: ...d deflection and high disabled deflection H_F2V A DC voltage proportional to horizontal frequency H_DRIVE Square wave 50 duty cycle synchronized to the selected horizontal sync HIGH VOLTAGE POWER SUPPLY OUTPUT DESCRIPTION HVPS_ SYNC Synchronization pulse for HVPS synchronized with the selected horiz sync at either same half or one third the frequency CONVERGENCEDEFLECTION BOARD OUTPUT DESCRIPTION ...

Page 57: ...ables 2 14 and 2 15 provide information for the technician to perform module level troubleshooting The following functions are provided by the HVD board Horizontal raster centering for all three colors Horizontal gate drive Switch mode power supply generating the required proportional DC supply Horizontal width adjustment Horizontal retrace switch network Left right pincushion and keystone correct...

Page 58: ...he HVD board does not create any interrupt and the interrupt line is not used for this application Table 2 14 lists the adjustments executed via the IIC bus interface I Input to HVD board O Output from HVD board Figure 2 14 Horizontal Vertical Deflection PCB I O Diagram 2 44 Model 220 Service Manual ...

Page 59: ...dth I 8 H_RED_CENT_CONTROL Data for adjustment of red horizontal centering I 8 H_GRN_CENT_CONTROL Data for adjustment of green horizontal centering I 8 H_BLU_CENT_CONTROL Data for adjustment of blue horizontal centering I 8 V_RED_CENT_CONTROL The data for adjustment of red vertical centering I 8 V_GRN_CENT_CONTROL The data for adjustment of green vertical centering I 8 V_BLU_CENT_CONTROL The data ...

Page 60: ...SWEEPOK Low good scan High no scan Signal is dependent on two inputs DEFL_OK from SRB and H_ENABLE from RTG SCAN REVERSAL BOARD INPUTS DESCRIPTION FRONT REAR Front or rear projection status line Front low Rear high FLOOR CEIL Floor or ceiling projection status line Floor low Ceiling high DEFL_OK Deflection OK signal High good about 2 v Low no scan H_CUR_ FDBK Horizontal current feed back A DC volt...

Page 61: ...ola waveform About 4 VPP OUTPUTS DESCRIPTION WIDTH_CTRL A DC waveform for controlling width of picture About 4 V max RASTER TIMING GENERATOR RTG BOARD INPUTS DESCRIPTION H_ENABLE A low on this line enables horizontal deflection A high disables the horizontal amplifier H_BAND 0 H_BAND 1 H_BAND 2 Horizontal frequency band line 000 band A 001 band B 011 band C and 111 band D HF_2V Horizontal frequenc...

Page 62: ...orizontal Vertical Deflection Board This board drives the convergence coils of the projectors The following functions are provided by C D Board Generation of various waveforms for the horizontal and vertical axes Height control Generation of waveforms for dynamic focus Various geometry correction functions for the horizontal and vertical axes Convergence output amplifiers for all colors and both h...

Page 63: ...NCE 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...

Page 64: ...f 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 ...

Page 65: ...rd 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 IIC_DATA IIC data line Bidirectional serial line for synchronous data transfer between the System Controller Board and the C D Board X_RED_ CONV ...

Page 66: ... 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 X_BLU Current feedback of blue horizontal X convergence...

Page 67: ...tical 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_ PARABOLA Horizontal parabola for dynamic focus section of High Voltage Power Supply V_ PARABOLA Vertical parabola for dynamic focus section of ...

Page 68: ...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 LINE FLOO...

Page 69: ...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 Model 220 Service Manual 2 55 ...

Page 70: ...put 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_SENS Current feedback of red vertical amplifier V_GRN V_GRN_SENS Current feedback of green vertical amplifier V_BLU V_BLU_SENS Cur...

Page 71: ...ent 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_...

Page 72: ..._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 horizon...

Page 73: ...Signals are not modified in any way by the Backplane It serves only as an interconnecting point Refer to Figure 2 17 for a general idea of how the projector wiring is interconnected through the Backplane PCB Backplane PCB P8 P12 P14 P18 P9 P7 P72 ALPS HVPS P43 P4 P32 CDB P3 P31 P10 P11 SCB P13 RTG P16 P17 VPB P1 P67 VAB P2 P68 P6 P36 HVDB P5 P35 P19 Proj Lens P62 Fans P76 LVPS VIC 1 VIC 2 VIC 3 Fi...

Page 74: ...intensity light through a liquid crystal layer It is the key component in producing very bright high resolution images from Hughes JVC large screen projectors Figure 2 18 The Hughes JVC Image Light Amplifier Optically there are two sides to an ILA assembly with a light blocking layer in the center On the input side there is a photo conductive layer where the image from a CRT is focused through a r...

Page 75: ...hotoconductor on the input side is not illuminated the liquid crystal does not rotate the polarized light from the Arc Lamp No light passes through the prism and the screen is dark When the input side is fully illuminated the liquid crystal rotates the polarized light 90 from a horizontal direction to a vertical direction Ninety nine percent 99 of the light entering the ILA assembly is reflected a...

Page 76: ...djustments is in Chapter 1 CAUTION Before performing procedures in this chapter review the chapter on Safety at the beginning of this manual WARNING When performing procedures in this chapter that require the projector covers to be removed wear high voltage gloves ANSI ASTM 10 000 volt rated when working near the CRTs Arc Lamp or power supplies Wear safety goggles rated X5 when working anywhere ne...

Page 77: ...placing the arc lamp It is not possible to predict how much variation there will be from lamp to lamp The adjustment procedure below for the first condensing lens should be performed only when the location of the hot spot on the screen is extremely offset from the center of the screen If the hot spot is not extremely off center skip steps A through G CAUTION This procedure should not be undertaken...

Page 78: ...rts of the body be kept away from the Arc Lamp light beam Severe burns can result from even short exposures to the light beam Do not allow anyone near the projector unless they are wearing safety goggles of at least X5 strength Do not look directly at the light beam even with safety goggles Light beam coming from First Condensing Lens is extremely intense and hazardous Keep hands and other objects...

Page 79: ...the edges Ensure the bright area extends to the edges of the screen but not over the edges If possible use a light meter to perform this step If using a light meter try to achieve a rolloff of 2 1 but no more than 4 1 to the screen corners The darker areas in each of the corners should be balanced evenly 8 When the Arc Lamp is focused over the entire screen area reset the Green ILA bias to origina...

Page 80: ... to get lamp power The resulting power should be 900 watts Figure 3 4 Zoom view of ALPS aperture 6 If the result is not 900 watts adjust the current adjust pot on the ALPS Figure 3 4 shows the current adjust pot locatlion within the ALPS aperture See Figure 4 4 for the aperture location CW increase CCW decrease If increasing notice that the Arc Lamp voltage from Step 2 may decrease slightly Adjust...

Page 81: ...nd right arrows to focus the projection lens to get sharply focused spacer balls NOTE 1 Spacer balls are used inside the ILA Assembly to separate the layers They are tiny random irregularly shaped spots that are visible throughout the image Look directly in front of the screen in the lighter areas of the image to view From throw distances shorter than 4 meters spacer balls are difficult to see 8 Z...

Page 82: ...the set screws are loose may cause the CRT to go out of focus or rotate 3 5 CRT Mechanical Focus The CRT Mechanical focus is factory set and will not normally require adjustment When a CRT is replaced the CRT mechanical focus must be reset Adjust colors individually After completing recheck other colors for additional adjustment Replacing the CRT could cause other colors to become misadjusted Use ...

Page 83: ...efocus or rotate the CRT as it is being tightened if the set screws are loose 9 Repeat the above steps for the Red and Blue CRTs Figure 3 5 CRT Mechanical Focus adjustments 3 6 CRT Rotation The CRT tilt adjustment aligns the CRT level with the screen This is a factory set adjustment and should not need adjusting unless the CRT or yoke is moved Remove the rear cover Section 4 2 and tilt the electro...

Page 84: ... Loosen the CRT Thumbscrew Figure 3 5 on the top of the CRT Assembly 7 Tilt the yoke by grasping the Thumbscrew and moving it in whichever direction it takes to make the CRT raster square 8 When the CRT raster is square on the screen tighten the 2 set screws first then the CRT thumbscrew 9 In the Geometry menu toggle the Reg Enable box back to On 10 Reset Bow Pincushion Keystone and Skew select pr...

Page 85: ...ith all 3 colors at maximum the image on the screen should be a white screen with some colors at the edges 4 Observe the right left top and bottom of the screen Normally green is the reference to which blue and red will be matched NOTE If the green ILA was replaced the blue or red image should be used as the reference to which green is matched If a red or blue border is present on either side or a...

Page 86: ...embly which allow for up and down movement Turn these screws in or out very slightly to allow the ILA to seat lower or higher whichever is needed 5 Reinstall the ILA assembly and replace the spring clip 6 Repeat Step 4 if adjustment is still needed 7 Retighten the 2 wing nuts 8 Reset the ILA biases to their previous levels from Step 2 3 9 Front Rear or Inverted Projection Jumper Settings 3 9 1 Fro...

Page 87: ...d Vertical Jumper Setting The Ceiling Floor jumpers invert the image vertically for use in some situations that use mirrors or ceiling projections Figure 3 6 illustrates the location of the jumpers on the Scan Reversal Board and indicates the proper location for ceiling or floor projection The Model 220 Projector is shipped in the normal vertical projection position with the jumper plug inserted i...

Page 88: ...flection board Scan Reversal board or CRT Yoke assembly They may also be needed when the convergence adjustment procedures fail to bring the colors into convergence Figure 3 8 Horizontal Vertical Deflection Board To adjust the Vertical height see Figure 3 8 1 Remove the rear cover Section 4 2 2 Select Test Pattern 5 X hatch NOTE Green is the master to which Red and Blue will be matched The Green h...

Page 89: ...ze coil to correct the error If Red is outside of Green on one side and inside of Green on the other side this is most likely caused by Red not being centered correctly and can be corrected with the centering adjustment User s Guide Section 5 5 11 If the Red horizontal size coil does not completely eliminate the size error between Red and Green balance the error on both sides to allow for easier c...

Page 90: ...its 8 Stop Bits 1 Parity None Parity Check Off Carrier Detect Off Flow Control XON XOFF Select OK NOTE Switch position 4 on the switch block at the card edge of the System Controller see Figure 5 1 controls the baud rate for Serial Port A for the Boot Manager and System Software Down 9600 Up 19200 Ensure the other SCB switches 1 2 and 3 are in the Down position 9 Turn the projector circuit breaker...

Page 91: ... version S Records processed 823 Upload Successful Address Range 0x00000000 0x00006687 Bytes Loaded 26248 WARNING FLASH WILL NOW BE UPDATED Press Enter to continue Esc to abort 11D The system has verified that the load module is correct and is ready to update the Flash Press Enter to perform the update press Esc now to abort the update with no changes While the Flash memory is being updated 15 30 ...

Page 92: ... with the Model 220 software Select file named zsys hex Press OK to start upload 12C During upload a progress indicator updates the number of records received When the upload is complete the system will display the following numerical values are for example only and depend on the System Software version S Records processed 11282 Upload Successful Address Range 0x00020000 0x000781cf Bytes Loaded 36...

Page 93: ...r or removing fingerprint smudges use Kodak Lens paper or equivalent from the projection lens As much as possible clean the optics only when absolutely necessary Projection Lens Use lens paper and wipe the lens clean in a vertical motion from top to bottom Use compressed air to blow excess dust from the lens An optical lens cleaning solution can also be used to remove finger smudges ILA Assembly C...

Page 94: ...4 20 4 17 Relay Lens 4 21 4 18 Projection Lens 4 22 4 19 Prism Assembly 4 23 4 1 Introduction NOTE Before removing the front or rear cover or replacing any components or subassemblies please review the Safety Chapter at the front of this manual Removal and replacement procedures in this chapter must be performed by Hughes JVC certified technicians and engineers only When performing any maintenance...

Page 95: ... guidelines below Left Right Orientation When left and right is mentioned in this chapter it is with reference to standing at the rear of the projector facing the screen Connectors on subassemblies and PCBs have tabs that must be released first before pulling on the connector The proper procedure is to push slightly IN on the connector then squeeze the tab then pull the connector out NOTE While pe...

Page 96: ...Chapter 4 Maintenance Removal Replacement Figure 4 1 Major components of the Model 220 Projector Model 220 Service Manual 4 3 ...

Page 97: ...over 3 Tilt up the front or rear cover CAUTION Do not leave either cover in the tilted up position The covers can fall from this tilted up position and possibly damage projector components Remove the cover and set it aside when servicing the projector 4 Release the two Latch Levers on the Rollbar assembly that hold the cover in place Place the ends of the Latch Levers into the holding slots CAUTIO...

Page 98: ...be washed with soap and water There are 3 polyurethane air filters in the Model 220 that require periodic cleaning They are located as follows 1 metal framed filter in the rear of the projector in the bottom cover accessible when the rear cover is off Figure 4 1 1 filter on the bottom of the projector slides out from the middle left side of the projector grasp the hole in the filter frame The filt...

Page 99: ...panel 5screws 4 Remove the Optical Shield 1 screw on top 2 screws on lower right side 1 screw at rear on bottom Figure 4 3 Arc Lamp Assembly 5 Remove the hex screw pin that holds the Arc Lamp fan to the housing Swing the fan outward to the right and out of the way 6 Disconnect the Arc Lamp cable and pull it through the hole in the top of the Arc Lamp housing so the Arc Lamp will have clearance to ...

Page 100: ...into the heat sink frame be sure the screw holes in the heat sink and the heat sink frame are aligned Be sure the Arc Lamp is fully secured into its socket connector when installing Push the lamp in firmly similar to inserting a PCB 12 After reinstalling the Arc Lamp perform the Arc Lamp Focus and Current Setting procedures as shown in Sections 3 1 and 3 2 4 5 Ignitor Assembly The Ignitor Assembly...

Page 101: ... Power Supply To remove the Arc Lamp Power Supply 1 Remove the front cover Section 4 2 2 Remove the lower right front side panel by removing the 5 pozidrive screws securing it 3 Remove the 2 pozidrive screws from the bottom of the EMI shield and slide it out of the way to the left 4 8 Model 220 Service Manual ...

Page 102: ...NOTE When replacing the cables on the terminals on J74 a mechanical pickup tool is very useful to start the screws 10 Perform the Arc Lamp Focus Alignment and Current Setting procedures as shown in Section 3 1 and 3 2 4 7 Low Voltage Power Supply To remove the Low Voltage Power Supply 1 Remove the front cover 2 Remove the lower right side panel by removing the 5 pozidrive screws securing it 3 Remo...

Page 103: ...k Timing Geometry Electronic Focus ILA Bias Sensitivity Convergence G2 and Shading 4 8 High Voltage Power Supply To remove the High Voltage Power Supply 1 Remove the front and rear covers Section 4 2 2 Remove the High Voltage Power Supply cover Figure 4 5 by removing the 2 pozidrive screws that secure the HVPS at the top of the cover and loosening the 1 pozidrive screw at the bottom of the front f...

Page 104: ... Control at upper left of HVPS 9 Disconnect and label the 3 Focus cables The square tabs on these cables see Figure 4 6 may have to be lifted up by gently prying with a flathead screwdriver 10 Remove all cables from the slot in the cable guide at the left side of the HVPS 11 Verify that all plugs and cables are removed and out of the way so the HVPS is free to be removed 12 Loosen do not remove th...

Page 105: ...ideo Processor boards are routed through the backplane board There are no connectors to remove To remove the Raster Timing Generator Video Processor or System Controller PCBs 1 Turn off power at the remote control and at the circuit breaker on the projector rear panel 2 Remove the projector rear cover 3 For the Raster Timing Generator and Video Processor PCBs grasp the card extractor tabs at both ...

Page 106: ...ectronic module card cage see Figure 4 7 5 Remove the Convergence Deflection PCB by sliding it upward so the mounting screws will clear the access holes then angle the right side outward NOTE In order to get the right side out it may be necessary to first move the board out enough to clear the access holes then angle the left side out just enough for the top 2 fins of the heat sync to fit over the...

Page 107: ...pozidrive screws that secure the H V Deflection Board to the electronic module cage 4 Remove the H V Deflection PCB by sliding it toward the left side of the projector this is the upward direction if the electronic module is raised up so that the mounting screws clear the access holes Then lift the side of the board that is nearest the front of the projector first and angle it upward so that the s...

Page 108: ...e the VIC a little if necessary to extract it 4 13 Video Amplifier PCB The Video Amplifier PCB for the 3 CRTs is located under the Electronic Module on the bottom frame of the projector behind and under the CRT assemblies To remove a Video Amplifier PCB 1 Remove the front and rear covers Section 4 2 2 Tilt the Electronic Module up Section 3 3 3 Loosen the Green CRT Holder Ring knurled knob see Fig...

Page 109: ...e Green CRT Socket Connector from the CRT neck Use care to avoid bumping the CRT as it is being removed and to avoid breaking any of the wires that connect from the CRT Socket Connector to the Video Amplifier 5 Move the Green CRT Yoke Assembly away from the rear of the projector then disconnect the Green CRT Socket Connector and the ground wire between the CRT Yoke Assembly and the CRT Socket Conn...

Page 110: ...couplers 11 Loosen the 6 pozidrive screws that secure the Video Amplifier PCB to the projector frame 12 Make sure everything is out of the way then slide the Video Amplifier PCB toward the left so the mounting screws will clear the access holes and remove the board from the projector 13 Reinstall in the reverse order from above NOTE The Video Amplifier PCB is shipped with the 3 CRT Socket Connecto...

Page 111: ...J101 To remove push in slightly squeeze the tabs then pull connector out 3 Move all cables out of the way 4 Remove the 4 pozidrive screws Figure 4 10 and lift the board out 5 Reinstall in the reverse order from above 4 15 CRT Yoke Assembly Warning The CRT Yoke Assemblies should be handled with extreme caution If dropped they can implode and flying glass can cause severe injury to personnel Be care...

Page 112: ...ce the HVPS will slide up and over it 4 Remove the CRT anode cable for the CRT that is to be replaced from the HVPS 5 Disconnect the Yoke plug and cable harness from the Scan Reversal PCB for the appropriate CRT see Figure 3 7 6 Remove the wires from the cable clamp for the CRT Yoke Assembly that is being removed 7 Loosen the CRT Holder Ring knurled knob in Figure 3 5 NOTE The CRT Holder Ring shou...

Page 113: ...nd ground wire while the other person holds the CRT Yoke Assembly firmly 10 After verifying that all cables are out of the way remove the CRT Yoke Assembly from the projector 11 Reinstall the CRT Yoke Assembly in the reverse order NOTE When reinstalling the CRT Yoke Assembly plug the CRT ground wire into the CRT Socket Connector first then partially plug in the Green socket connector into the CRT ...

Page 114: ...he ILA assembly by its housing and slide it out 7 Replace the ILA in the reverse order from above 8 Recheck convergence shading ILA bias and G2 and readjust if necessary User s Guide Sections 5 8 5 10 5 7 5 9 9 Recheck the ILA Back Focus Section 3 4 and the ILA Overlap adjustment Section 3 8 4 17 Relay Lens To remove a Relay Lens refer to Figure 4 11 1 Remove the rear cover Section 4 2 2 Tilt up t...

Page 115: ...Lens 9 Replace the Relay Lens in reverse order from above 4 18 Projection Lens To remove the Projection Lens 1 Remove the sponge cover from around the front of the Projection Lens 2 Disconnect and label the Projection Lens Focus and Zoom motor cables The Focus motor is at the top of the Projection Lens The Zoom motor is at the bottom 3 Loosen do not remove the Lens holding screw at the right side ...

Page 116: ... Allow 2 4 hours to perform the removal and replacement of the Prism Assembly Refer to Figures 4 1 and 4 11 for assemblies referenced in this procedure To remove the Prism Assembly 1 Remove front and rear covers Section 4 2 2 Remove the Optical Shield 4 screws 3 Remove the lower right side panel 5 screws 4 Remove the Arc Lamp Base Assembly arc lamp ignitor laser power supply and blower First disco...

Page 117: ...ce Removal Replacement 8 Remove the Rollbar Bracket that was holding up the left side of the Rollbar assembly 9 Remove the 3 ILA asssemblies Section 4 15 Figure 4 14 Dichroic Mirror Assembly 4 24 Model 220 Service Manual ...

Page 118: ...f the Prism assembly These screws are located in the cavities where the ILA assemblies were removed see Figure 4 15 11 The Prism is now free to be removed CAUTION The Prism assembly is heavy about 70 lbs Use two people to lift it out of the projector 12 Replace the Prism assembly in the reverse order Model 220 Service Manual 4 25 ...

Page 119: ...Chapter 4 Maintenance Removal Replacement 4 26 Model 220 Service Manual ...

Page 120: ...e various LEDs are located that indicate proper or improper operation of the System Controller the Raster Timing Generator the Video Processor Board the Scan Reversal Board the Convergence Deflection Board the Video Amplifier Board the Low Voltage Power Supply and the High Voltage Power Supply Figure 5 1 Projector rear with cover and rear panel off Model 220 Service Manual 5 1 ...

Page 121: ...Chapter 5 Troubleshooting Figure 5 2 Left side of projector with rear cover off Figure 5 3 Right Side of projector with rear cover off 5 2 Model 220 Service Manual ...

Page 122: ... HW Flash Memory HW driver 3 IIC HANDLER IIC Handler for Convergence Deflection PCB Horizontal Vertical Deflection PCB Raster Timing Generator PCB Video Amplifier PCB Video Processor PCB 4 POWER ON OFF Power On Sequencing 5 FLASH MANAGER Flash Memory Data Manager 6 VIDEO SWITCHER EXTRON or JVC Video Switcher Handler 7 ANSI OUTPUT Ansi Output Display process 8 UI CHAN SRC User Interface VIC Configu...

Page 123: ...ash Memory Erase Sector Failure 2 4 Verify Error Flash Memory Write Verify Failure NOTE Category 3 error codes may occur when power is interrupted by opening the cover interlock switches or during power brown outs 3 1 Pin Timeout IIC Slave HW protocol error possible on each byte transfer 3 2 BB Timeout IIC Slave HW protocol error 1st error possible on Read or Write 3 3 No Slave Ack IIC Slave HW pr...

Page 124: ...No error codes in Category 5 Flash Manager Most Category 6 error codes indicate RS232 communication errors and apply to Switchers only 6 1 Sync Timeout No Header found in data stream possible baud rate error 6 2 No Char Repeat Expected data characters to be repeated failed 6 3 Invalid Format Data not in Extron or JVC Switcher format 7 1 Write Len Error Ansi Output to RS232 port was interrupted inc...

Page 125: ...er not enabling interlock switch Reposition projector cover 4 2 No Picture Correct channel input VIC selected Select correct channel and VIC User s Guide 4 6 Arc Lamp turned off Restart projector User s Guide 4 3 System power turned off Restart projector User s Guide 4 3 Signal source Verify signal source is turned on and properly connected User s Guide 3 5 HIDE command invoked Unhide image with t...

Page 126: ...e 5 9 2 Picture Geometry Picture not centered or sized correctly Repeat the Blanking Phase Size and Centering procedures User s Guide 5 4 3 5 4 4 5 5 1 5 5 2 Picture wraparound at left or right edge Readjust Blanking and Phase User s Guide 5 4 3 5 4 4 Retrace lines on raster Adjust TOP Blanking User s Guide 5 4 3 Image not squared Check Geometry and readjust if necessary User s Guide 5 5 3 through...

Page 127: ...e 5 7 5 10 Grey scale is Green in bright areas Subtract Green Sensitivity Offset and add Red and Blue User s Guide 5 9 2 Grey scale is Red in bright areas Subtract Red Sensitivity Offset and add Green and Blue User s Guide 5 9 2 Grey scale is Blue in bright areas Subtract Blue Sensitivity Offset and add Green and Red User s Guide 5 9 2 Picture Various Problems Out of focus blurry area on image lim...

Page 128: ...CRT Yoke 3 6 Flagwaving at top of picture or top of image is skewed VTR mode checked in Timing menu Deselect VTR mode User s Guide 4 9 4 Timing 5 Black line appears on the screen Loss of fluid in Prism Replace Prism 4 18 No Response when using a Tether cable on the Remote Possible defective tether cable Replace tether cable No Response when using IR remote Intermittent operation Replace remote bat...

Page 129: ...Chapter 5 Troubleshooting 5 10 Model 220 Service Manual ...

Page 130: ... Green 45 for Red 46 100594 Lens First Condensing Asphere 104162 Lens Second Condensing 104156 Manual Operation User s Guide 104199 Manual Service 104346 Motor Focus 103666 Optics Cover Assembly 102612 PCA Convergence Deflection 102581 PCA Horizontal Vertical Deflection 102583 PCA Raster Timing Generator 102589 PCA System Controller 102591 PCA Video Amplifier 102593 PCA Video Processor 102597 PCA ...

Page 131: ...c Lamp 104114 Power Supply High Voltage 102566 Power Supply Low Voltage 102520 Prism Assembly 103942 Projection Lens 1 5 1 Fixed 104003 Projection Lens Zoom 2 6 to 5 1 1 103746 Remote Control Standard 104348 Remote Control Technician 104019 Shipping Case Hardigg 101617 Yoke Assembly CRT 103467 ...

Page 132: ...tcher Port B Device ANSI Remember to Power Off Control P and HW RESET Push RESET button figure 5 1 in Service Manual or Circuit Breaker on rear panel after changing any configuration parameters WARNING If you use 19200 Baud your computer must have a 16550 UART installed on the Comm Port An unbuffered 8550 UART will lose data during EXPORT This data loss cannot be detected until a later IMPORT is a...

Page 133: ...e transfer Export Configuration EXPORT IN PROGRESS wait Press ESC to Abort The following message is sent at the end of the export data Export Complete STOP Host Download Now Then Press ESC END A similar message is displayed on the projector screen Export Configuration EXPORT COMPLETE STOP Host Download THEN Press ESC 6 Windows TERMINAL Select the Windows TERMINAL STOP button with the mouse to end ...

Page 134: ...Host Upload THEN Press ESC to Abort 6 Windows TERMINAL Transfers Send Text File 6 1 Directories set directory to desired upload directory C TEMP 6 2 File Name Type desired File Name for example import1 txt 6 3 Select OK with mouse or press Enter key upload begins 6 4 Verify TERMINAL screen shows status line at bottom Stop Pause complete bar Sending EXPORT1 TXT 6 5 Data transfer will continue until...

Page 135: ... Old Data was Restored STOP Host SEND DATA THEN Press ESC FINALLY press ESC to exit the projector Import operation and return to the Maintenance Menu There is a 10 second pause before the screen is redrawn 9 DATA TRANSFER ERROR Example Model 220 Menu will display Import Failed Bad EXPORT File Format Old Data was Restored STOP Host SEND DATA THEN Press ESC 9 1 Windows TERMINAL FIRST press STOP to e...

Page 136: ...ed or received Wider bandwidth provides more information or picture detail capability Chrominance Abbreviated as C Color information signal or signals Cold Mirror Mirror that absorbs infrared light so that its reflection contains only cold light that does not transmit appreciable heat As a result of this absorption of infrared heat radiation cold mirrors get quite hot CRT Cathode Ray Tube The vacu...

Page 137: ... high intensity light through a liquid crystal layer It is a key component in producing very bright high resolution images from Hughes JVC large screen projectors Image Mirror Directs the blue and red images toward the Combining Prism Interlacing The technique that refreshes a display screen by alternately displaying all the odd lines field one and then all the even lines field two of one frame I ...

Page 138: ...am of a picture tube as it travels from the end of any horizontal line to the beginning of either the next horizontal line or field The beam is turned off during retrace RGB Red Green Blue Refers to the method of recording and generating colors in a video system On a television or color monitor colors are displayed as varying intensities of red green and blue dots When red green and blue are all t...

Page 139: ...d Remote Provides access to many of the setup functions by direct keys instead of by menu maneuvering Throw Distance to the screen from the projector Underscan Decrease raster size H and V so that all four edges of the picture are visible on the display Vertical Height Pots Potentiometers located on the Horizontal Vertical Deflection Board Used to adjust Vertical height Vertical Resolution The amo...

Page 140: ...Glossary Model 220 Service Manual B 5 ...

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