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Chapter 2---System Description

2.3.4 Video Processor PCB

The Video Processor Board (VPB) is the bottom-most card (see
Figure 5-1) in the card cage. It is connected directly to the
Backplane board through 2 connectors. When an external signal
is being received, the VPB provides Horizontal Sync, Vertical
Sync, and 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

•

Sensitivity and Threshold signal input and control

•

Automatic limiting for Contrast, G2, and internal video

The Video Processor I/O diagram and the list of inputs and
outputs provide information to allow the technician to perform
module-level troubleshooting.

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Summary of Contents for 200

Page 1: ...SERVICE MANUAL Model 200 Projector ...

Page 2: ...ddition the above product complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC 104111 First Edition November 1996 104111 Rev A February 1997 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 witho...

Page 3: ...ear or Inverted Vertical 3 12 3 10 Vertical and Horizontal Size Settings 3 13 3 11 Software Updating 3 15 3 12 Cleaning Lenses ILA Assemblies and Mirrors 3 17 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 Arc Lamp Power Supply 4 8 4 6 Low Voltage Power Supply 4 8 4 7 High Voltage Power Supply 4 8 4 8 Raster...

Page 4: ...Chapter 5 Troubleshooting PCB Status LEDs 5 1 Error Codes 5 4 Troubleshooting Guide 5 5 Chapter 6 Parts List 6 1 Appendix A Import Export A 1 Appendix B Glossary B 1 Model 200 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: ...e Arc Lamp the lighted Projection Lens or into the lamp housing from any distance 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...

Page 8: ... electrical assemblies components and wiring If performing the ILA Back Focus CRT Mechanical Focus CRT rotation or ILA Overlap adjustment as outlined in Chapter 3 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...

Page 9: ...uate 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 certified ...

Page 10: ...Safety Information Model 200 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 200...

Page 14: ...Chapter 1 Introduction 1 4 Model 200 Service Manual ...

Page 15: ...e assemblies and components in the Model 200 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 Condensing Lens 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...

Page 16: ...reen and Blue This light is then modulated with the image signal 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 lig...

Page 17: ...d light Light from the arc lamp is polarized horizontally and reflects 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 Thu...

Page 18: ...r Supply are mounted next to the arc lamp inside the Arc Lamp assembly housing 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 JVC certified technicians only Xenon Arc Lamp Condensing Lens High pressure ionized xenon gas supports a high curre...

Page 19: ...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 output side of its ILA Assembly and combined with the signal from the input side of the ILA Assembly Each of these three light beams independently combine with the image in their own Red Green or Blue color sys...

Page 20: ...Chapter 2 System Description Figure 2 1 Optical System Block Diagram 2 6 Model 200 Service Manual ...

Page 21: ...wo purposes first to provide 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 bri...

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: ...ler sends the LAMP_ENA signal to the Arc Lamp Power Supply 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 37 amps The LAMP_LIT signal ou...

Page 25: ...58 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 description of the inputs to and outputs from the HV...

Page 26: ...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 Low Voltage Power Supply...

Page 27: ...RTs About 25 KV RED_FOCUS GRN_FOCUS BLU_FOCUS Focus 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 Model 200 Service Manual 2 13 ...

Page 28: ...nd sync interface for the Model 200 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 GREEN BLUE HORIZ VERT RED_VIC GREEN_VIC BLUE_VIC H_VIC V_VIC SEL_VIC IIC_CLK IIC_DATA IIC_INT 5 1Vstby 5 1V 15V 15V IIC 12 B2 B4 B6 B8 B10 A16 B16 B15 B14 B13 A13 A12 Pin callouts are to P12 P14 or P18 dependin...

Page 29: ...ted 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 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...

Page 30: ... 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...

Page 31: ...ame as the Standard RGBHV 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 fu...

Page 32: ...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...

Page 33: ...onal 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 ...

Page 34: ... 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 RGBH...

Page 35: ...ly one LED can light at one time IIC Interface The Quad Standard Decoder 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 s...

Page 36: ...an Input to the VIC output refers to an output from the VIC Table 2 6 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: ... Description Low Voltage Power Supply INPUTS DESCRIPTION 5 1 V 5 1 V supply for use by The Quad Decoder VIC 15 V 15 V supply for use by the Quad Decoder VIC Interlocks and protection None Model 200 Service Manual 2 23 ...

Page 38: ...ry 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 Sensitivity and Threshold signal input and control Automatic limiting for Contrast G2 and int...

Page 39: ..._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 information transferred over ...

Page 40: ...h 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 7 Video Processor I O signals System Controller Board INPUT DESCRIPTION RED_OVER Red signal of on screen menu and or internal test pattern GRN_OVER Simila...

Page 41: ...al 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 to RTG board GRN_SYNC Green sync signal to RTG board GRN_INPUT Green video signal to RTG board Video Amplifier INPU...

Page 42: ... 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 Similar to RED_VIC 1 BLU_VIC 3 Similar to RED_VIC 1 H_VIC 1 Horizontal sync signal inpu...

Page 43: ...input video source from VIC 1 SEL_VIC 2 Similar to SEL_VIC 1 SEL_VIC 3 Similar to SEL_VIC 1 Low Voltage Power Supply INPUTS DESCRIPTION 5 1 volts Power supply to digital components 15 Volts Power supply to analog components 15 Volts Power supply to analog components Model 200 Service Manual 2 29 ...

Page 44: ...nd Outputs Table 2 8 provide information for the technician to perform module level troubleshooting G1 Regulator for three CRTs The input supply for the G1 grid of the CRTs is G1_SUPPLY and is about 200V The VAB regulates this supply to about 80V to 30V This supply can be adjusted by the G1_BIAS line This adjustment provides the brightness control function The G1_BIAS signal is an input of the VAB...

Page 45: ...lock Diagram CRT interface for Focus heater voltages and ARC ground The three CRT sockets are part of the VAB They provide the necessary interface for the input of the three CRTs The Focus voltage for each color is connected directly to the socket of each CRT The VAB provides ARC grounds for each CRT which are used to protect against arcing of the CRT anode supply IIC Interface The VAB does not us...

Page 46: ... line Low good VAB High Bad VAB This signal is called HV_ENABLE at the HVPS RED_BEAM GRN_BEAM BLU_BEAM Cathode beam current lines about 1 volt per 100 UA 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_FOCUS GRN_FOCUS BLU_FOCUS Focus supply for CRTs about 7 KV OUTPUTS DESCRIPTION ARC_GND CRT ...

Page 47: ...ne of the heater voltage for CRTs Ground level RED_ CATHODE GRN_ CATHODE BLU_ CATHODE Video output signals of the VAB about 40 VPP with peak voltage of about 70 V RED_GRID2 GRN_GRID2 BLU_GRID2 G2 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 voltage 15 V 15 V supply ...

Page 48: ...r Enables control for the Low Voltage Power Supply Arc Lamp and cooling fans 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 re...

Page 49: ...gure 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 Controller Board Input Output This section provides a description of the inputs to and outputs from...

Page 50: ...tion for blue Real time data at 0 volt to 1 volt GRN_THRES Similar to BLU_THRES RED_THRES Similar to BLU_THRES 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_ VALID This signal indicates a new source or valid A high indicates a valid stable signal and ...

Page 51: ... IIC data line Bidirectional serial line for synchronous data transfer between the SCB and the Convergence Deflection board X_RED_ CONV Red X convergence waveform The amplitude for full scale correction is about 1 VPP X_GRN_ CONV Grn X convergence waveform The amplitude for full scale correction is about 1 VPP X_BLU_ CONV Blu X convergence waveform The amplitude for full scale correction is about ...

Page 52: ...EAR 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 portion of SCB 15V Power for the analog portions of the SCB 15V Power for the analog portions of the SCB 5 1V_Stby Standby power to the CPU and peripherals LV_OK Tells SCB status of non standby supply all outputs wor...

Page 53: ...TS DESCRIPTION LAMP_ENA Enables ALPS power Projection Lens OUTPUTS DESCRIPTION LENS_FOCUS Signal to lens focus motor LENS_ZOOM Signal to lens zoom motor Front IR INPUTS DESCRIPTION FRONT_IR Input from front infrared receiver REAR_IR Input from rear infrared receiver Model 200 Service Manual 2 39 ...

Page 54: ...amp 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 7 and 2 8 provide information for the technician to perform module level troubleshooting Horizontal frequency band selection and LED logic The RTG produces a voltage that is proportional to the horizontal frequency whic...

Page 55: ...s on the RTG board see Figure 5 2 that indicate frequency bands input modes and lock mode of the phase 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 ...

Page 56: ...signal The assembly communicated with is used as the primary heading of each output Input refers to an input to the RTG output refers to an output from the RTG Table 2 11 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 tran...

Page 57: ...TPUTS DESCRIPTION H_BAND0 H_BAND1 H_BAND2 Horizontal frequency band lines Band A 000 Band B 001 Band C 011 and band D 111 H_ENABLE Low enabled 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 ...

Page 58: ...orting circuitry of RTG board 5 1V_STBY Stand by 5 1 V Not used by RTG board Interlock and protection Input None Output The RTG will disable the Horizontal Deflection Board by placing a high on the H_ENABLE line during any of following events A During and about 2 seconds after the programming period of the FPGA B During frequency band change period C During the period that the phase locked loop is...

Page 59: ...l retrace switch network Left right pincushion and keystone correction Drive main deflection coils to provide horizontal raster scan for all three CRTs Drive main vertical coils to provide vertical raster scan for all three CRTs Vertical linearity adjustments individually for all three colors Vertical raster centering for all three colors IIC interface IIC Interface All adjustments for the HVD boa...

Page 60: ...al Deflection IIC Data Interface Input Output No of bits Information Description I 8 V_RED_LIN_CONTROL Data for adjustment of red vertical linearity I 8 V_GRN_LIN_CONTROL Data for adjustment of green vertical linearity I 8 V_BLU_LIN_CONTROL Data for adjustment of blue vertical linearity 2 46 Model 200 Service Manual ...

Page 61: ...ent 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 for adjustment of blue centering O 1 FRONT ...

Page 62: ...the System Controller Board and the HVD Board OUTPUTS DESCRIPTION IIC_SINT IIC interrupt line This is not used by HVD Board Video Processor Board OUTPUTS DESCRIPTION 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...

Page 63: ...tion Board INPUTS DESCRIPTION V_RAMP Vertical ramp waveform About 4 VPP V_PARAB Vertical parabola 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...

Page 64: ...ng power supply of the horizontal deflection amplifier in the event of a loose yoke or loose scan reverse connector This prevents the power supply section of the Horizontal Vertical Deflection Board from operating when 1 or more yoke connectors are disconnected SWEEP_OK Shuts down the video amplifiers in the event of deflection failure if DEFL_OK or H_ENABLE are not present 2 50 Model 200 Service ...

Page 65: ...ion of waveforms for dynamic focus Various geometry correction functions for the horizontal and vertical axes Convergence output amplifiers for all colors and both horizontal and vertical axes Convergence enable and raster fill function ILA assembly driver circuitry with temperature compensation Phase locked loop for ILA assembly drivers IIC serial bus interface The Convergence Deflection Input Ou...

Page 66: ...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 67: ...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 68: ...D Board Table 2 13 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 Red X convergence waveform The amplitude ...

Page 69: ... convergence amplifier X_GRN Current feedback of green horizontal X convergence amplifier 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...

Page 70: ...oltage 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 High v Voltage Power Supply Low Voltage Power Supply INPUTS DESCRIPTION 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 Inte...

Page 71: ...vertical deflection amplifiers The Scan Reversal Board Input Output diagram Figure 2 16 and the list of inputs and outputs Table 2 15 provide information for the technician to perform module level troubleshooting Table 2 14 shows the signal states for modes of projector operation The SRB does not require any IIC bus interface Table 2 14 Scanning signal states Mode of Operation FRONT REAR line FLOO...

Page 72: ...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 2 58 Model 200 Service Manual ...

Page 73: ...ier 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 Current feedback of blue verti...

Page 74: ...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 r...

Page 75: ...AME 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...

Page 76: ...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 77: ...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 78: ...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 79: ...Chapter 2 System Description Model 200 Service Manual 2 65 ...

Page 80: ...emblies and components For a complete list of tools required to perform adjustments refer to 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 ...

Page 81: ... arrow and adjust the bias back until an all white flat field is observed The flat field screen must be white to properly perform the arc lamp focus and alignment 6 Loosen the large flathead screw turn CCW at the bottom of the Arc Lamp cover Figure 4 2 and lift the cover 7 Defocus the Arc Lamp by turning the Focus Adjust Screw see Figure 3 1 until a bright circular area see Figure 3 2 is achieved ...

Page 82: ...l plate up or down so that the hot spot is centered vertically 13 Tighten the 2 vertical alignment screws 14 Adjust the focus screw for overall brightness from the center to the edges with a minimum of rolloff NOTE Rolloff is the gradual difference in brightness from the center of the screen to the edges Ensure the bright area extends to the edges of the screen but not over the edges If possible u...

Page 83: ...ify that power is off to the projector or turn power off with the remote it is not necessary for the circuit breaker to be off 2 Place a DVM set to read up to 200VDC across the Arc Lamp DC INPUT terminals J74 Figure 3 3 3 Turn projector power on Figure 3 3 Arc Lamp Power Supply connections 4 Place another DVM set to read at least 200 millivolts dc across the test points inside the small rectangula...

Page 84: ... electronic module turn CCW and pull out 3 Pull out the release pin on the rear right side of the electronic module to tilt it up Tilt the electronic module up to a vertical position 4 Ensure the holding pin locks the electronic module in place 3 4 ILA Back Focus The ILA Back Focus adjustment moves the ILA Relay Lens CRT assemblies together to adjust the focal length This adjustment allows the zoo...

Page 85: ...e CRT snug against the collar to get additional range and then retighten the collar 10 Loosen the 2 hex bolts Figure 4 12 on the ILA assembly in front of the Relay Lens 11 Slide the Relay Lens CRT ILA assembly forward or backward until the sharpest spacer ball focus is achieved NOTE Do not use the zoom lens focus while performing this step 12 Repeat Steps 6 11 until the spacer balls stay in focus ...

Page 86: ...e Focus test pattern 3 Zoom the Projection Lens to the widest angle largest image and adjust the Projection Lens focus for the sharpest image of the Focus test pattern 4 Tilt the Electronic Module up Section 3 3 5 Loosen the two set screws Figure 3 5 near the top of the CRT sleeve 6 Loosen the CRT focus lock screw located on the Guide Plate at the top of the CRT shield Figure 3 5 The CRT is now fr...

Page 87: ... is moved Remove the rear cover Section 4 2 and tilt the electronic module up Sections 3 3 1 Select Test Pattern 8 Center Lin 2 View the color for the CRT that requires rotation Hide the other 2 colors 3 In the Geometry menu set Reg Enable to off by unchecking the box Unchecking the Reg Enable box temporarily disables any convergence corrections that have been performed with a different CRT Yoke a...

Page 88: ...bscrew 9 In the Geometry menu toggle the Reg Enable box back to On 10 Reset Bow Pincushion Keystone and Skew select proper color for Skew to the values noted previously in Step 4 11 Recheck Bow Pincushion Keystone and Skew and readjust if necessary Also recheck Convergence refer to the Model 200 User s Guide 12 Repeat the above procedure for any other CRT that is not level 3 7 CRT Electronic Focus...

Page 89: ...ed 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 at the top or bottom the ILA overlap needs adjustment If both red and blue overlap the border will be yellow In either case proceed with the adjustment below If there is no overlap reset the ILA biases to their pr...

Page 90: ...t 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 Front Rear Jumper Setting Horizontal Reverse The Horizontal Scan Reversal Jumper reverses the image projection for front or rear projection Figure 3 7 illustrates the jumpers location on the Scan Reversal Board an...

Page 91: ...jumper plug inserted into J53 For an inverted vertical setup this jumper plug must be inserted into J53A Refer to Figure 3 7 To invert the vertical image 1 Turn power off at the projector and wait for the arc lamp to cool 2 Remove the projector rear cover Section 4 2 3 Tilt the electronic module up Section 3 3 4 Verify that the vertical jumper is inserted in the correct jacks for appropriate appli...

Page 92: ...n at the top and higher at the bottom adjust Red vertical pot to correct the error If Red is higher than Green at the top and bottom or lower than Green at the top and bottom 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 height pot does not completely eliminate the difference in height betwee...

Page 93: ...pdated via the projector s serial Port A To perform an update a disk containing the updated Boot Software boot hex and or System Software zsys hex and a PC with Windows 3 1 avoid Windows 95 at this time is required to perform update Boot Manager Software and System Software are separate products Each may be updated independently The System Software will depend on a specific version of the Boot Man...

Page 94: ...ndows Terminal screen where x x 0 is the currently loaded Boot Manager version e g 0 9 0 or 1 1 0 Boot Manager Ver x x 0 Service Mode Startup Copyright c 1994 Hughes JVC Technology Command _ 11 Verify that the Boot Manager version is correct If it is necessary to update the Boot Manager perform the following steps If the Boot Manager is already up to date skip to Step 12 to update the System Softw...

Page 95: ...the system will display the following Reprogramming Flash Sector 0 1 Boot Manager software update successful Command _ The Boot software has been successfully updated To restart the projector under control of the updated boot manager enter the reboot command while depressing the service mode switch Figure 5 1 The projector will now restart with the updated boot manager software You should see the ...

Page 96: ... with no changes While the Flash is being updated approx 15 30 seconds DO NOT turn off the projector circuit breaker this may make the machine unbootable requiring a new set of flash chips to be installed When the update is complete the system will display the following Reprogramming Flash Sector 2 3 4 5 6 7 8 9 System software update successful Command _ The software update is complete To restart...

Page 97: ...er smudges ILA Assembly Clean the ILA assembly faces with compressed air only Do not wipe the ILA assembly faces CRT Faces Use compressed air to blow dust off and lens paper to clean face Relay Lens Same as Projection Lens Mirrors and Polarizing Beam Splitter Windows The Optical Shield covers the Dichroic Mirror Assembly X Frame and Polarizing Beam Splitter windows Normal cleaning is not required ...

Page 98: ...s VICs 4 13 4 12 Video Amplifier PCB 4 14 4 13 Scan Reversal PCB 4 16 4 14 CRT Yoke Assembly 4 16 4 15 ILA Assembly 4 18 4 16 Relay Lens 4 19 4 17 Projection Lens 4 20 4 18 Prism Assembly 4 21 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 t...

Page 99: ... 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 Power off After turning power off with the remote wait until the Arc Lamp cooling fans have stopped running then toggle the projector circuit breaker on the rear panel to OFF and disconnect the power cord allow a discha...

Page 100: ...Lenses ILA s and Video Amplifier PCB Tilt Card Cage up for access Card Cage containing System Controller Raster Timing Generator Video Processor and Video Input Cards Prism Assembly Rollbar Shutter Motors Horizontal Vertical Deflection PCB Convergence PCB on opposite side Metal Framed Air Filter behind Grille Card Cage Holding Pin Scan Reversal Board Low Voltage Power Supply Figure 4 1 Major compo...

Page 101: ...zidrive spring screws at the front of the front cover or the rear of the rear cover 3 Tilt up the front or rear cover CAUTION Do not leave either cover tilted up 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 P...

Page 102: ...er There are 4 polyurethane air filters in the Model 200 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 filter can be peeled off the Ve...

Page 103: ...ont cover Section 4 2 2 Disconnect the fan connector from the Arc Lamp exhaust fan 3 Loosen turn the large retainer screw at the bottom of the Arc Lamp assembly cover Figure 4 3 Figure 4 3 Arc Lamp cover 4 Lift the Arc Lamp assembly cover up and tilt it back 5 Remove and label the two Arc Lamp cables at the Ignitor side these two connections are shown inside the heavy circles in Figure 4 4 Leave t...

Page 104: ... Remove the 5 pozidrive screws securing the projector s lower right side panel Figure 4 1 and remove the panel 3 Disconnect the fan connector from the Arc Lamp cooling fan 4 Disconnect and label the positive and negative cables from the Arc Lamp Power Supply terminals marked DC OUTPUT Figure 3 3 5 Remove the Arc Lamp Air Filter and cover by removing the 3 pozidrive screws that secure it to the Lam...

Page 105: ...p Focus Alignment and Current Setting procedures as shown in Section 3 1 and 3 2 4 6 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 Remove the 2 pozidrive screws securing the EMI Shield Slide the shield to the left and remove it 4 Remove J76 DC Output and J75 AC Input from...

Page 106: ...s that secure the HVPS at the top of the cover and loosening the 1 pozidrive screw at the bottom of the front flap Do not remove this bottom screw it is difficult to reinstall The HVPS will slide up and over it Figure 4 5 High Voltage Power Supply cover Figure 4 6 High Voltage Power Supply 3 Carefully slide the cover upward and outward to remove it Model 200 Service Manual 4 9 ...

Page 107: ...2 pozidrive screws that hold the top of the HVPS metal housing to the projector frame 14 Grasp the HVPS at the bottom and lift upward and outward so that it slides away from the bottom screws 15 Reinstall the HVPS in the reverse order from above When reinstalling be sure that the HVPS slides over the bottom screws and the lip at the top of the projector frame Make sure each anode cable snaps back ...

Page 108: ...Grasp the bracket and pull out the SCB 4 When replacing boards verify that power is off at the circuit breaker the power plug is disconnected and there are no bent pins on any connectors Make sure the board is properly and securely seated before reapplying power NOTE To remove connectors on the printed circuit boards below push the connector in slightly then squeeze the tab and pull the connector ...

Page 109: ...llow a little more clearance for the right side to be removed then maneuver the right side out 6 Reinstall the Convergence Deflection PCB by lowering the right side in first until it clears the electronic module edge then lowering the left side in NOTE it may be necessary to fit the top 2 fins of the heat sync over the electronic module frame lip at the left to get enough clearance for the right s...

Page 110: ... rear clears the lip of the electronic module frame Be careful when removing or reinstalling the board to avoid gouging it on the fan screws or cable clamps 5 Reinstall the HV Deflection PCB by lowering the side that is nearest to the rear of the projector in first until it clears the electronic module edge then lowering the other side Carefully fit the board over the mounting screws and slide the...

Page 111: ...ith the CRT Socket Connector still connected to the Green CRT and the ground wire still connected from the CRT Yoke Assembly to the CRT Socket Connector This is because the Green CRT Socket Connector is close to the rear of the projector and is easier to disconnect from the CRT after the CRT Yoke Assembly is loose and is moved away from the rear of the projector Use extreme care not to break any o...

Page 112: ...rs on the HVPS NOTE Observe that each of the 3 Focus cables large red wires that run from each CRT Socket Connector to the Focus connectors on the HVPS is joined near the CRT by a coupler plug and jack Disconnect and label the focus cables at these 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 sli...

Page 113: ... Disconnect 7 connectors J52 J54 J64 J65 J66 J50 or J50A and J100 or 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 14 CRT Yoke Assembly Warning The CRT Yoke Assemblies should be handled with extreme caution If dropped they can ...

Page 114: ...the High Voltage Power Supply HVPS cover Figure 4 5 and loosen the one screw at the bottom of the cover do not remove the bottom screw it is difficult to replace 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 w...

Page 115: ...ne person can unplug the CRT socket connector and 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 p...

Page 116: ...erse 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 16 Relay Lens To remove a Relay Lens refer to Figure 4 11 1 Remove the rear cover Section 4 2 2 Tilt up the Electronic Module Section 3 3 3 Remove the corresponding CRT Assembly beh...

Page 117: ...ojection 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 hex locking screw at the right side Figure 4 13 of the Projection Lens 4 Rotate the Projection Lens left or right so that the notch on the lens clears the locking screw on the lens holder Figure 4 12 Car...

Page 118: ...ssembly requires the removal of more components and assemblies than any of the other assemblies Be sure to have storage cabinets or tables to house the various items as they are removed to provide access to the Prism Assembly Allow about 3 4 hours to perform the removal and replacement of the Prism Assembly Refer to Figures 4 1 and 4 11 for the assemblies referenced in this procedure To remove the...

Page 119: ... Maintenance Removal Replacement Figure 4 14 Dichroic Mirror Assembly 8 Remove the 2 hex bolts from the front of the Prism assembly see Figure 4 15 Figure 4 15 Prism Assembly mount 4 22 Model 200 Service Manual ...

Page 120: ...lock switch 10 Remove the Rollbar Bracket that was holding up the left side of the Rollbar assembly 11 Remove the 3 ILA asssemblies Section 4 15 12 Remove the remaining three hex bolts from the rear of the Prism assembly These screws are located in the cavities where the ILA assemblies were removed see Figure 4 15 13 The Prism is now free to be removed CAUTION The Prism assembly is heavy about 70 ...

Page 121: ...Chapter 4 Maintenance Removal Replacement 4 24 Model 200 Service Manual ...

Page 122: ...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 200 Service Manual 5 1 ...

Page 123: ...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 200 Service Manual ...

Page 124: ...ory Number Error Category Description 1 CEXEC Operating System 2 FLASH 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 OUTPU...

Page 125: ...d Flash sector number 2 2 Write Timeout Flash Memory Write Failure 2 3 Erase Timeout Flash 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...

Page 126: ...installed BAD 4 24 Lamp Start Not On LAMP_OK is high lamp module not installed jumper missing ALPS bad 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 W...

Page 127: ...Test switch operation If defective replace switch Projector cover 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 conn...

Page 128: ...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 129: ...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 130: ...uide 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 battery or move closer to the projector Stay in the Line of sight of the projector IR Receiver No response when using keyboard co...

Page 131: ...Chapter 5 Troubleshooting 5 10 Model 200 Service Manual ...

Page 132: ...cher 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 at...

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 200 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 R...

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: ...rd 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 am...

Page 140: ...Glossary Model 200 Service Manual B 5 ...

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