SERVICE MANUAL Model 250 Projector 2310 Camino Vida Roble Carlsbad, California 92009 Phone: (760) 929-5300 Fax: (760) 929-5410
DECLARATION OF CONFORMITY PER ISO/IEC GUIDE 22 AND EN 45014 Manufacturer: Hughes JVC 2310 Camino Vida Roble Carlsbad, Ca 92009 USA Hughes-JVC declares that this product conforms to the following Product Specifications (Directive/Standard): Safety: EN 60950 IEC 950 (1992) EMC: EN 55022 (1988) / CISPR-22 (1986) Class "A" EN 50082-1 (1992) / IEC 801-2(1991) EN 50082-1 (1992) / IEC 801-3(1984) EN 50082-1 (1992) / IEC 801-4(1988) ANSI C63.
Table of Contents Safety Information .................................................................................... v Chapter 1 Introduction 1.1 Safety...................................................................................................... 1-1 1.2 Updates................................................................................................... 1-2 1.3 Acronyms ...............................................................................................
6.5 IR Detectors............................................................................................ 6-4 6.6 EMI Shield ............................................................................................. 6-4 6.7 Cleaning Lenses, ILA® Assemblies, and Mirrors................................... 6-5 Chapter 7 Troubleshooting 7.1 7.2 7.3 7.4 7.5 Safety...................................................................................................... 7-1 LEDs................................
Chapter 1---Introduction 1.0 Introductio n Contents 1.1 Safety............................................................................................................ 1-1 1.2 Updates......................................................................................................... 1-2 1.3 Acronyms Used ............................................................................................
Chapter 1---Introduction When performing procedures that call for the 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 near the light path from the Arc Lamp or at all times around the projection lens. 1.2 Updates Hughes-JVC will periodically provide bulletins and /or manual supplements to ensure the continued accuracy of this service manual. 1.
Chapter 1---Introduction SECAM SRB SYNC TTL UL UV VAB VCO VIC VIN VPB VSYNC VTR Y Sequential couleur a memoire (sequencial color with memory Scan Reversal Board Synchronization Transistor-Transistor Logic Underwriter Laboratories Ultraviolet Video Amplifier Board Voltage Controlled Oscillator Video Input Card Video Input Video Processor Board Vertical Sync Video Tape Recorder Luminance Model 250 Service Manual 1-3
Chapter 2---System Description 2.0 System De scription Contents 2.1 Introduction .................................................................................................. 2-1 2.2 Electrical Section.......................................................................................... 2-2 Incoming Power Circuit ............................................................................. 2-2 Power Supplies...........................................................................................
Chapter 2---System Description Figure 2-1 Overview of the Model 250 projector showing major components 2.2 Electrical Section The electrical section consists of the Incoming Power Circuit, and the Power Supplies and the Igniter Assembly. The following paragraphs give a list of major components and a brief description of those components. For a more detailed description of a component, refer to the chapter and section dedicated to that particular component.
Chapter 2---System Description Igniter Assembly The Igniter Assembly provides the high voltage pulse that lights the Arc Lamp and acts as a link from the Arc Lamp Power Supply to the Arc Lamp after the Arc Lamp has been lit. 2.3 ! Igniter - The Igniter actually performs three functions. It is a step-up transformer that supplies the high voltage pulse to light the Arc Lamp. It also supplies the spark gap for the high voltage pulse.
Chapter 2---System Description ! Condensing Lenses (2) - The Primary Condensing Lens collects all the light from the Light Pipe and begins to bend the light rays into a straight path. The Secondary Condensing Lens works with the Primary Condensing Lens to collimate or “straighten” the light path before it enters the Dichroic Beamsplitter Assembly. ! UV Filter - The UV Filter removes much of the unwanted ultravioltet light from the white light of the Arc Lamp.
Chapter 2---System Description Relay Lens Assemblies (3) There are three Relay Lenses, one for each color. The Relay Lens focuses the image light from the CRT onto the photosensitive layer on the input side of the ILA®. The Relay Lens is physically connected to the CRT (see Figure 2-2). Front Projection Lens The Model 250 comes with a choice of four standard lenses. These include a motorized Zoom Lens or one of three Fixed Lenses. All Projection Lenses have motorized focus. 2.
Chapter 2---System Description Printed Circuit Boards (PCB) The Model 250 Projector has eight main PCBs: 2-6 ! System Controller PCB - System Controller PCB controls much of the electronics system. It uses digital and analog circuitry to generate Menu and internal pattern overlays, and directs convergence correction and shading information. It controls the IIC data bus that sends geometric correction and VIC selection data.
Chapter 2---System Description provides an interconnection interface for all the electronic components in the projector. CRT/Yoke Assemblies The CRT/Yoke Assemblies bridge between the Optical and the Electronic sections. The CRTs could be included in the Optical section because they produces the image light transmitted to the ILA®s, but they are included in the Electronic section because they are the end user for the image signals from the VICs, Video Processor PCB, and Video Amplifier PCB.
Chapter 2---System Description projector. These air-borne particles can land on optics such as the ILA® and cause large diffuse dark areas on the screen. EMI Shield The Model 250 has an EMI (Electro-Magnetic Interference) Shield that traps and collects high frequency noise that is radiated by switching power supplies such as the Arc Lamp Power Supply and the Low Voltage Power Supply. This high frequency noise can interfere with the operation of radios, televisions, and other electronic devices.
Chapter 2---System Description Model 250 Service Manual 2-9
Chapter 3---Electrical 3.0 Electrical Contents 3.1 Safety............................................................................................................ 3-1 3.2 Incoming Power Circuit ............................................................................... 3-2 AC Power Cord .......................................................................................... 3-2 AC Circuit Breaker.....................................................................................
Chapter 3---Electrical Left/Right Orientation: When referring to the left or right 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. 3.2.
Chapter 3---Electrical 3.3 Power Supplies All Series 200 projectors including the Model 250 have three power supplies. These include: ! Low Voltage Power Supply ! Arc Lamp Power Supply ! High Voltage Power Supply There is a fourth power supply, the Laser Power Supply, but that power supply is used only for the Igniter Assembly during Arc Lamp lighting. Low Voltage Power Supply (LVPS) LVPS - Main Functions: ! Provides all the low voltages needed by the projector. ! Provides standby power (+5.
Chapter 3---Electrical Figure 3-1 Low Voltage Power Supply I/O Diagram. LVPS - Operation: AC power is delivered to the Low Voltage Power Supply from the AC line filter. The AC is rectified to a DC Voltage, filtered, and goes through a power factor correction circuit to force the current waveform to follow the voltage waveform. The +5.1V Standby is on whenever AC power is connected to the projector and the circuit breaker on the rear panel is in the ON position.
Chapter 3---Electrical ! +5.1V for digital components ! +6.2V for CRT filaments ! ±15V for analog circuits ! +80V supply used by the High Voltage Power Supply, Video Amplifier PCB, and the Horizontal/Vertical Deflection PCB. LVPS - Service Adjustments There are no service adjustments for the Low Voltage Power Supply. LVPS - Remove and Replace Tools Needed: #2 Posi-drive Phillips-head screwdriver Parts Needed: Low Voltage Power Supply - p/n 102520 To remove the Low Voltage Power Supply: 1.
Chapter 3---Electrical ALPS - Inputs: AC input power: Directly from the AC Line Filter. The input range is from 220240 VAC, at 50/60 Hz. /LAMP_ENA - from the System Controller PCB. Turns on the ALPS. /COVER_ON - signal enabling the Arc Lamp Power Supply. /LAMP_OK - the input is jumpered at the Arc Lamp Power Supply (tied to ground) so it is always low. / = Active Low ALPS - Outputs: 3-6 ! +170 VDC output during the boost phase to get Arc Lamp ignition. This supplies the power for the Igniter.
Chapter 3---Electrical Figure 3-2 Arc Lamp Power Supply signals and voltages. ALPS - Operation: Three signals (/LAMP_ENA, /COVER_ON, and /LAMP_OK) are required in order for the Arc Lamp Power Supply to light the Arc Lamp. The /LAMP_OK (active low) input is jumpered to ground at the Arc Lamp Power Supply, so it is always low. The Arc Lamp Power Supply sends the /LAMP_OK to the System Controller PCB.
Chapter 3---Electrical The Arc Lamp Power Supply sends the /LAMP_LIT signal back to the System Controller when the Arc Lamp is lit. The Arc Lamp regulates its output to give a constant Arc Lamp power. If the Arc Lamp has not lit within 20 seconds (/LAMP_LIT still high), the System Controller PCB will try once more to re-initiate the sequence. If the Arc Lamp still fails to light, an error code will appear on the back panel (see section 7.22 Error Codes).
Chapter 3---Electrical 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord. 3. Remove the front cover (see section 6.1 Projector Covers ). 4. Remove the lower-right-side panel by removing the five Pozi-drive screws securing it. 5. Remove the five Pozi-drive screws securing the EMI Shield. Slide the shield to the left and remove it. 6. Disconnect the INPUT AC plug. 7. Disconnect the two CONTROL SIGNALS cables.
Chapter 3---Electrical Figure 3-4 High Voltage Power Supply I/O signals. HVPS - Inputs HVPS_SYNC - this signal is generated on the Raster Timing Generator PCB. Square wave HCT level with 50 or 33% duty cycle. The signal is synchronized to horizontal sync. /HV_ENA - The HVPS shutdown signal from the Video Amplifier PCB (/VA_OK). H_PARABOLA - The horizontal parabola from the Convergence Deflection PCB used by the Dynamic Focus Amplifier.
Chapter 3---Electrical RGB Anode Voltage - goes directly to each CRT RGB Focus Voltage - goes directly to each CRT Arc Ground - The Arc Ground protection for each CRT from the Video Amplifier PCB. HVPS - Operation The High Voltage Power Supply has three basic functions.
Chapter 3---Electrical HVPS - Remove and Replace Tools Needed #1 Pozi-drive Phillips-head screwdriver #2 Pozi-drive Phillips-head screwdriver small Flathead screwdriver Parts Needed High Voltage Power Supply p/n 102566 To remove the High Voltage Power Supply: 1. Power off the projector by IR Remote or PC, and allow the cooling fans to run until they shut off. 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord. 3. Remove the front cover. 4.
Chapter 3---Electrical Table 3-1 HVPS - P45 I/O Pinout PIN # 1 Description GND (+80V) PIN # 9 Description +15V 2 GND (+15V) 10 -15V 3 GND (-15V) 11 G1 SUPPLY 4 GND (G1) 12 /HV_ENA 5 /HV_OK 13 V PARABOLA 6 H PARABOLA 14 H DRIVE (HVPS_SYNC 7 GND (DAF) 8 +80V Figure 3-6 High Voltage Power Supply. 5. Carefully slide the cover upward and outward to remove it. NOTE: Refer to Figure 4-5 for the remainder of this procedure. 6. Disconnect the three CRT Anode Cables. 7.
Chapter 3---Electrical 10. Disconnect P45 (“Control”) at upper left of HVPS. 11. Disconnect and label the three Focus cables. The square tabs on these cables (see Figure 3-6) may have to be lifted up. Gently pry up with a small Flathead screwdriver. 12. Remove all the cables from the slot in the cable guide located on the left side of the HVPS. 13. Verify that all plugs and cables are removed and out of the way so the HVPS is free to be removed. 14.
Chapter 3---Electrical 3.4 Igniter Assembly The Igniter Assembly consists of the Igniter and the Laser Power Supply. The Igniter and Laser Power Supply are replaced as one unit. Igniter Assemby - Main Functions: ! Generates 32 kV pulse to light Arc Lamp Power ! Acts as link between Arc Lamp Power Supply and Arc Lamp during normal Arc Lamp operation Igniter Assembly - Inputs ! +170 V - From the Arc Lamp Power Supply during Arc Lamp lighting.
Chapter 3---Electrical Figure 3-7 Igniter Assembly. Igniter Assembly - Service Adjustments There are no service adjustments performed on the Igniter Assembly. Igniter Assembly - Remove and Replace Replace the Igniter and the Laser Power Supply as one unit. Tools Needed 2 - 7/16-inch wrench (one open end wrench) #1 Pozi-drive Phillips-head screwdriver Parts Needed Igniter Assembly p/n 106570 To remove the Igniter Assembly 1.
Chapter 3---Electrical 5. Disconnect the orange cable attached to the input side of the Igniter Transformer using the 7/16-inch wrench. This cable will have black shrink sleeving on it. It goes to the negative terminal of the Arc Lamp Power Supply. 6. Disconnect the orange Cathode cable from the Igniter ground post using the 7/16-inch wrench. Remove the other orange cable that goes to the positive terminal of the Arc Lamp Power Supply. 7. Remove the five #1 Pozi-drive Phillips-head screws. 8.
Chapter 4---Optical 4.0 Optical Contents 4.1 4.2 4.3 4.4 4.5 Arc Lamp...................................................................................................... 4-2 Optical Path .................................................................................................. 4-7 ILA® ............................................................................................................. 4-13 Relay Lenses .....................................................................................
Chapter 4---Optical 4.1 Arc Lamp The Arc Lamp is the beginning of the high intensity Light Path. It is located inside a housing on the right side of the Optical Support Assembly (see Figure 4-5). Arc Lamp - Main Functions: The Arc Lamp is a single component composed of a Xenon gas bulb at the center of a compound elliptical reflector. It supplies the high intensity white light used by the projector to put a very bright image on the screen.
Chapter 4---Optical CAUTION! Fan disconnection is acceptable for a short period of time only (preferably <20 minutes--maximum 45 minutes). WARNING!!! 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.
Chapter 4---Optical Hot spot off-center Figure 4-1 Arc Lamp “Hot Spot” (brightest area) is off-center vertically and horizontally. Adjust to center the “hot spot”. Figure 4-2 Arc Lamp alignment fixture.
Chapter 4---Optical Figure 4-3 Arc Lamp Assembly access door. Arc Lamp - Remove and Replace The Arc Lamp Enclosure Assembly consists of the Xenon Arc Lamp module and blower. Replace the blower together with the Arc Lamp Module. Tools Needed 7/16 inch wrench #1 Pozi-drive Phillips-head screwdriver Diagonal wire cutters (or equivalent) Parts Needed Arc Lamp p/n 106298 WARNING!!! Dangerously bright light and high current exist in this area of the projector.
Chapter 4---Optical 5. Disconnect the orange Cathode cable from the Igniter, using the 7/16-inch wrench (see Figure 3-7). 6. Cut the cable tie that is wrapped around the ferrite inductor (metal tube with white cap below the blower). 7. Disconnect the Arc Lamp door fan cable. This cable runs through the door and out the bottom of the Arc Lamp Assembly housing (below the right side inFigure 4-3).
Chapter 4---Optical Figure 4-4 Arc Lamp Assembly top view. 4.2 Optical Path Optical Path - Main Function ! Transports the Arc Lamp high intensity light from the Arc Lamp to the ILA® and from the ILA® to the Projection Lens ! Removes the Infrared light that contains most of the heat ! Removes the unwanted Ultraviolet light ! Condenses the white light using the Light Pipe for a uniform output ! Separates the white light into its RGB component colors using Dichroic Beamsplitters.
Chapter 4---Optical Figure 4-5 Upper level view of Optical Path (top view). Optical Path - Inputs Arc Lamp high intensity white light Component RGB Image light from each of the ILA® Optical Path - Outputs Component RGB polarized light to the ILA® Output image light to the Projection Lens Optical Path - Operation The light travels from the Arc Lamp into the Optical Path (see Figure 4-5). The light reflects off a cold mirror and passes through a light pipe.
Chapter 4---Optical The Dichroic Beamsplitter Assembly separates the white light into its red, green, and blue components. Each component light beam goes into the Prism Assembly where it is polarized. Light can be viewed as having two electromagnetic components: a Horizontalelectric field and a Vertical-electric field. These fields are perpendicular to each other.
Chapter 4---Optical Figure 4-6 Optical Path 4-10 Model 250 Service Manual
Chapter 4---Optical Figure 4-7 Optical Path Optical Path - Service Adjustments Tools Needed 3-mm Hex wrench Parts Needed No serviceable parts The one adjustment that can be performed on the optical path is with the XY Positioner that moves the #1 Condensing Lens in the X- and Y-axis.
Chapter 4---Optical Positioner adjusts the light beam coming out of the Light Pipe so that it projects squarely onto the face of the ILA®. NOTE: Do not adjust the XY Positioner unless there is a dark edge visible on screen. If the XY Positioner is misaligned, there will be a dark edge on the left, right, top or bottom edge caused by the edge of the Light Pipe. Perform the Arc Lamp alignment before adjusting the XY Positioner unless the dark edge makes Arc Lamp alignment difficult or impossible.
Chapter 4---Optical 4.3 ILA® ILA® Main functions ! Modulates image light from the CRT onto the high intensity polarized light from the Arc Lamp ! Reflects high intensity light received from the Prism Assembly back into the Prism Assembly after modulating with image light ! Adjustable bias voltage and frequency (ILA® Sensitivity) ! Adjustable offstate with Super Contrast ILA®s ! Image light from CRT is blocked from output.
Chapter 4---Optical ILA® Operation The ILA® plays a critical part in bringing the image to the screen. The ILA® receives the image light when the CRT projects the image through the Relay Lens and focuses it onto the photoconductive layer on the input side of the ILA®. The image does not pass directly through the ILA® but is transferred by a change of impedance of the photoconductive layer to the Liquid Crystal Layer on the output side of the ILA®.
Chapter 4---Optical NOTE: Reset the ILA® bias after setting the Compensator and check G2 Sensitivity Offset, and Threshold Offset level (see Model 250 User’s Guide, section 5.8 Black Level G2 and Sensitivity Offset). ILA® Overlap This adjustment positions the ILA® assemblies in their sockets so that the image from each ILA® will overlap (be placed on top of) the other two ILA®s. Make this adjustment whenever replacing an ILA®.
Chapter 4---Optical CAUTION! To avoid damaging the connector, grasp the ILA® assembly itself, not the connector at the top. Figure 4-10 ILA® Assembly top view. The overlap screws shown are under the ILA®. They are visible only after the ILA® assembly is removed. 13. If the overlap is at the top or bottom, be sure the projector is level. Slide the spring clip (see Figure 4-10) at the top of the ILA® assembly back. 14. Loosen the two hex nuts, using a 4-mm hex-head wrench.
Chapter 4---Optical 19. Retighten the two wing nuts and tighten the two hex nuts. 20. Reset the ILA® biases to their previous levels from Step 2. ILA® Back Focus Adjustment The ILA® Back Focus adjustment moves the ILA®/Relay Lens/CRT assemblies forward or backward as one unit to focus the ILA® output on the screen. When using a zoom lens this adjustment allows the zoom lens’ tracking to remain focused on the screen throughout the entire zoom range.
Chapter 4---Optical WARNING!!! Always wear an ANSI/ASTM 10,000 volt rated safety glove when working around CRTs due to the High Voltage present there. NOTE: If the ILA®/Relay Lens/CRT assembly cannot be moved close enough to get a good spacer ball focus, loosen the CRT Lens Stopper Ring in front of the CRT Holder Ring using a 2.5-mm Hex wrench. Move the CRT snug against the collar to get additional range, and then, retighten the collar. 10.
Chapter 4---Optical 8. Loosen the two hex bolts (see Figure 4-10) on the ILA® assembly in front of the Relay Lens. 9. Slide the Relay ILA®/Lens/CRT assembly forward or backward to achieve the sharpest spacer ball focus. NOTE: Do not use the projection lens focus while performing this step. 10. Tighten the hex bolts on the Green ILA® Assembly and the wing nut on the Green Relay Lens. 11. Repeat Steps 7-10 above for other colors that need ILA® Back Focusing. Be sure to hide the other two colors.
Chapter 4---Optical 4.4 Relay Lenses The Relay Lens focuses the image light received from the CRT on the photoconductive layer of the ILA® (see Figure 4-9). There are no service adjustments for the Relay Lens. The Relay Lens rarely needs service and is not considered a serviceable part. 4.5 Projection Lens Projection Lens - Input Combined RGB image light from the Prism Assembly.
Chapter 4---Optical 3. Loosen (do not remove) the Lens holding screw at the right side (see Figure 4-11) of the Projection Lens. Figure 4-11 Projection Lens holding screw and removal notch. NOTE: The 0.96:1 Projection Lens has an adapter sleeve installed on it. The Projection Lens is installed the same as other Projection Lenses except the Holding Bolt needs to be loosened more to allow the Projection Sleeve to clear it. 4.
Chapter 5 Optical 3-4-22 Model 100 Service Manual
Chapter 5---Electronics 5.0 Electronics Contents 5.1 Safety............................................................................................................ 5-1 5.2 Introduction .................................................................................................. 5-2 5.3 System Controller PCB ................................................................................ 5-3 5.4 Video Processor PCB ...................................................................................
Chapter 5---Electronics WARNING!!! Never look directly at the 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. 5.2 Introduction The Model 250 Electronics System includes nine printed circuit assemblies. They provide all the controlling voltages and signals to adjust and correct picture settings, geometry, convergence, and shading (see Chapter 4 of the User’s Guide).
Chapter 5---Electronics Figure 5-2 Model 250 Electronics Module with PCBs (side view). CAUTION! It is very strongly recommended that setup data be downloaded (Exported, see section 8.2 Importing/Exporting) before performing any of the following procedures. Exporting baseline source setup data to disk is an excellent precautionary measure. It will save the time of setting up new source file(s) in the case of an unexpected problem. 5.
Chapter 5---Electronics ! I/O control for VIC selection ! Two RS-232 serial interface ports ! Infrared (IR) remote control interface. Accepts input from front or rear IR detectors. ! External 3 color system status LEDs. Green indicates normal, yellow is standby and red indicates a fault condition. ! External Service Mode Switch. Pressing this switch during a power-up sequence brings the system up in a diagnostic mode (for maintenance) rather than a normal operating mode.
Chapter 5---Electronics Figure 5-4 System Controller PCB I/O Diagram for Power Supplies and peripherals.
Chapter 5---Electronics Figure 5-5 System Controller PCB I/O Diagram for other PCBs. System Controller PCB - Inputs /LV_OK - signal from the Low Voltage Power Supply; it tells the System Controller PCB that all the non-standby supply voltages are working. /HV_OK - signal from the High Voltage Power Supply; it tells the System Controller PCB that all the high voltage supplies are working. /LAMP_OK - signal from the Arc Lamp Power Supply.
Chapter 5---Electronics 280_CLK - Square wave signal from the Raster Timing Generator PCB, with 50% duty cycle, synchronized to the horizontal sync at 280 times the frequency of the horizontal sync. This signal is used by the System Controller PCB to properly output shading and convergence data. SOURCE_VALID - Signal from Raster Timing Generator PCB indicates a new source (or valid source). A high indicates a valid stable signal and a low indicates a change in input signal.
Chapter 5---Electronics RGB_THRES - red, green, or blue Threshold correction information to the Video Processor PCB. RGB_SENS - red, green, or blue Sensitivity correction information to the Video Processor PCB. ISYNC - 5 MHz clock to the Raster Timing Generator PCB, used to generate the internal sync signals Y_RGB_CONV - control signals to Convergence Deflection PCB for Red, Green, or Blue Convergence in the y-axis (full-scale correction is about 1 Vpp).
Chapter 5---Electronics Figure 5-6 Power On timing sequence. Normal Operation Functions During normal projector operation, the System Controller PCB receives commands through the remote control, tethered remote control, or a PC. Commands issued from the IR remote controls are received through IR Detectors located on the front and rear of the projector. Commands issued from a PC, Laptop, or Tethered Remote Control are received through the RS-232 serial interface ports.
Chapter 5---Electronics Controller PCB also enables the selected VICs through the IIC bus based on the VIC selected on the Channel Menu. The System Controller PCB generates the on-screen menus and test pattern overlays and sends them to the Video Processor PCB. It sends the X and Y Convergence correction data to the Convergence Deflection PCB. It sends Threshold and Sensitivity shading data to the Video Processor PCB for the all three colors.
Chapter 5---Electronics 5.4 Video Processor PCB Video Processor PCB - Main Functions ! Video signal input and multiplexing ! Sync signal stripping ! Overlay signal multiplexing ! Brightness, Contrast, DC Restore and Blanking ! Video signal gamma correction ! Sensitivity and Threshold signal input and control ! Automatic Contrast, G2, and internal image limiting Video Processor PCB - Inputs RGBHV VIC 1,2, & 3 - External image signals from the VICs for red, green, and blue.
Chapter 5---Electronics Figure 5-7 Video Processor PCB I/O diagram for VICs and Power Supplies.
Chapter 5---Electronics Figure 5-8 Video Processor PCB I/O diagram for PCBs. Video Processor PCB - Outputs RGB_VID - red, green, or blue video signal to Video Amplifier PCB, typically 01 V. H&V_SYNC - horizontal sync pulse goes to the Raster Timing Generator PCB. GRN_SYNC - sync-on-green sync pulse goes to the Raster Timing Generator PCB. RESTORE - DC Restore control signal to the Video Amplifier PCB.
Chapter 5---Electronics RGB_G2 - red, green, or blue G2 voltage adjust control signal to the Video Amplifier PCB. G1_BIAS - G1 adjust control voltage (global adjustment) to the Video Amplifier PCB. IIC_INT - IIC interrupt output to System Controller PCB. Video Processor PCB - Operation The Video Processor PCB accepts image and synchronizing inputs in either composite or separate RGBHV component format from the selected VIC.
Chapter 5---Electronics The G2 voltage accelerates the electrons that are emitted from the cathode of the CRT. The CRT filament emits the electrons and G1 voltage regulates the amount of electrons that are emitted from the cathode. The G2 voltage is adjusted through the menu (Black Level). The Video Processor PCB receives the G2 control data for each color through the IIC bus and sends an analog voltage to the Video Amplifier PCB to control the G2 voltage.
Chapter 5---Electronics 6. Pull the black card extractor handles back to disconnect the Video Processor PCB connector and pull the PCB out of the Electronics Module. 7. Reverse the procedure to install the Video Processor PCB. 5.
Chapter 5---Electronics Figure 5-11 Raster Timing Generator for other PCBs. Raster Timing Generator PCB - Inputs V_SYNC - input vertical sync from the Video Processor PCB. H_SYNC - input horizontal sync from the Video Processor PCB. G_SYNC - Sync-on-Green sync stripped from green video signal at the Video Processor PCB. ISYNC - 5 MHz clock from the System Controller PCB used to generate the internal sync.
Chapter 5---Electronics IIC_CLK - IIC clock line. Unidirectional clock line for control of synchronous data transfer over the IIC bus. IIC_DATA - IIC data line. Bi-directional serial line for synchronous data transfer between System Controller PCB and Raster Timing Generator PCB. +15 V (two inputs) - input power from LVPS for analog circuitry including the Phase Lock Loop (PLL) circuit. -15 V (two inputs) - input power from LVPS for analog circuitry including the Phase Lock Loop (PLL) circuit. +5.
Chapter 5---Electronics V_DRIVE - square wave negative going pulse to the Convergence Deflection PCB, synchronized to the selected vertical sync with the pulse width of about four horizontal periods. Raster Timing Generator PCB - Operation The Raster Timing Generator PCB generates a square wave that is phase-locked to the horizontal sync pulse.
Chapter 5---Electronics Vertical Deflection PCB to break the range of horizontal scan frequencies into four smaller ranges called bands (see Figure 5-12). Figure 5-12 LEDs on the Raster Timing Generator PCB. Raster Timing Generator PCB - Remove and Replace Tools Needed #1 Pozi-drive Phillips-head screwdriver Parts Needed Raster Timing Generator PCB - p/n 105238 To remove the Raster Timing Generator PCB: 1.
Chapter 5---Electronics 5.
Chapter 5---Electronics IIC_CLK - IIC clock line IIC_DATA - IIC data line IIC_SINT - IIC interrupt ±15 V - input power from the Low Voltage Power Supply, for the analog circuitry. +5.1 V - input power from the Low Voltage Power Supply, for the digital circuitry. Figure 5-13 Horizontal/Vertical I/O Diagram.
Chapter 5---Electronics Figure 5-14 Horizontal/Vertical I/O Diagram for Scan Reversal and Video Amplifier PCBs.
Chapter 5---Electronics Vertical Adjustment Pots Figure 5-15 Physical layout of the Horizontal/Vertical PCB (note the Vertical Size Adjustment Pots (Red-137, Grn-148, and Blu-160) on the lower right). Horizontal Vertical Deflection PCB - Outputs /SWEEP_OK - signal to the Video Amplifier PCB, derived from the H_ENA signal from the Raster Timing Generator PCB, and the DEFL_OK from the Scan Reversal PCB.
Chapter 5---Electronics Horizontal Vertical Deflection PCB - Operation The Horizontal Vertical Deflection PCB consists of a RGB horizontal deflection amplifier and separate vertical deflection amplifiers. The Horizontal Deflection Amplifier The horizontal deflection amplifier is a switching mode power supply that varies according to the input horizontal sync frequency. The horizontal supply generates the sawtooth current-driven waveform that drives the horizontal deflection coils on the CRT.
Chapter 5---Electronics the V_PARAB waveform. The output waveform V_RGB+ goes to the Scan Reversal PCB and then drives the Vertical Deflection Yokes. The Vertical Deflection Yoke return signal to the Horizontal Vertical Deflection PCB is V_RGB-. Horizontal Vertical Deflection PCB - Service Adjustments Vertical Size Adjustment Tools Needed Miniature Potentiometer-Trimmer Adjustment tool To adjust the Vertical height (see Figure 5-15): 1.
Chapter 5---Electronics Figure 5-17 Red image needs vertical adjustment (increase). If Red is higher than Green at the top and bottom, or lower than Green at the top and bottom, the Red image may not being centered correctly. This can be corrected with the centering adjustment (see Model 250 User’s Guide, Chapter 5). Figure 5-18 Red image needs vertical centering.
Chapter 5---Electronics Horizontal Vertical Deflection PCB - Remove and Replace The Horizontal/Vertical (H/V) Deflection PCB is located in the upper portion of the Electronic Module card cage. Tools Needed: #1 Pozi-drive Phillips-head screwdriver Parts Needed: Horizontal Vertical Deflection PCB p/n 105236 To remove the Horizontal/Vertical (H/V) Deflection PCB: 1. Power off the projector by IR Remote or PC, and allow the cooling fans to run until they shut off automatically. 2.
Chapter 5---Electronics ! 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 Convergence Deflection PCB - Inputs X_RGB_CONV - x-axis Convergence waveform from the System Controller PCB (the amplitude for full-scale correction is about 1 Vpp).
Chapter 5---Electronics Figure 5-19 Convergence Deflection PCB I/O Diagram.
Chapter 5---Electronics Figure 5-20 Convergence Deflection PCB I/O Diagram.
Chapter 5---Electronics Figure 5-21 Physical layout of the Convergence/Deflection PCB. Convergence Deflection PCB - Operation The Convergence Deflection PCB performs four main functions. It generates the vertical deflection sawtooth waveform. It generates the square waves that bias the three ILA®s. It controls the amplitude of waveforms used for convergence corrections, and it generates the parabolic waveform used for dynamic focus.
Chapter 5---Electronics temperature of the green ILA® increases, the bias is increased to maintain a constant ILA® output. The Convergence Deflection PCB receives commands for x and y-axis convergence from the System Controller PCB. The Convergence Deflection PCB has a Convergence Control Section that receives the convergence commands, waveforms from the Waveform generator, and geometric correction data from the IIC interface. It amplifies the convergence data and outputs it to the Scan Reversal PCB.
Chapter 5---Electronics 8. 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 side to be installed. Carefully fit the board over the mounting screws and slide the PCB into position. Tighten the screws and reconnect the connectors. 5.
Chapter 5---Electronics Y_RGB_YOKE (neg.) - bottom of red, green, and blue y-axis convergence yokes. RGB_LOCK (neg.) - interlock for red, green, and blue deflection yokes (5 V when closed or 0 V when open). Scan Reversal PCB - Outputs H_LOCK (neg.) - Horizontal Interlock for the yoke connectors to the Horizontal Vertical Deflection PCB (about 5 V when closed, 15 V when open). FRONT/REAR - front or rear projection status line to Horizontal Vertical Deflection PCB (front = low, rear = high).
Chapter 5---Electronics Figure 5-22 Scan Reversal PCB I/O Diagram.
Chapter 5---Electronics Figure 5-23 Scan Reversal PCB I/O Diagram for Horizontal Vertical Deflection PCB.
Chapter 5---Electronics Figure 5-24 Scan Reversal PCB I/O Diagram for CRT Yokes. Scan Reversal PCB - Operation The Scan Reversal PCB has several functions. It provides an interface for scan reversal, and provides for horizontal width adjustment. The Scan Reversal PCB outputs the convergence and deflection waveforms that drive the CRT convergence and deflection yokes, and it contributes significantly to the CRT Protection circuit.
Chapter 5---Electronics front/upright projection. This means the horizontal scan jumper is plugged into J100, the vertical scan jumper is plugged into J53, and the convergence jumper is plugged into J50. NOTE: Whenever the horizontal scan jumper is switched from front projection to rear projection, the convergence must also be switched from J50 to J50A.
Chapter 5---Electronics Scan Reversal PCB - Service Adjustments Figure 5-25 Physical layout of the Scan Reversal PCB. Horizontal Size adjustment The Horizontal size adjustment must be performed after the Horizontal Vertical Deflection PCB is replaced. Tools Needed Delrin .100 hex alignment tool Equipment Needed No equipment needed To adjust the horizontal size coils (see Figure 5-25): 4. Remove the rear cover and pull the Interlock switch out to the Service Mode position. 5.
Chapter 5---Electronics 10. Recheck all Geometry and Convergence settings and readjust wherever necessary. 11. Replace the rear cover. Front/Rear Projection Jumper Settings In the procedures below each of the jumpers mentioned have a specific purpose: J100 and J101 are the horizontal scanning jumpers, J 53 and J53A are the vertical scanning jumpers, and J50 and J50A are the convergence jumpers. CAUTION! Do not attempt to switch jumpers while the projector is operating.
Chapter 5---Electronics Table 5-1 Projection orientation jumper settings. Convergence. P50 goes to: Vertical. P53 goes to: Horizontal. P100 goes to: J50 J53 J100 Front/Inverted* JA50 JA53 J101 Rear/Floor (Upright) JA50 J53 J101 J50 JA53 J100 Orientation Front/Floor (Upright) Rear/Inverted* * see CAUTION! below NOTE: Whenever the horizontal scan jumper is switched from front projection to rear projection, the convergence must also be switched from J50 to J50A.
Chapter 5---Electronics 7. Power ON the projector and allow it to stabilize for a minimum of 15 minutes. It is recommended that the projector be operating for a least one hour before performing shading adjustments. 8. When changing jumpers for floor or ceiling screen projection, Centering, Convergence and Shading must be rechecked. Scan Reversal PCB - Remove and Replace The Scan Reversal PCB is located on the front side of the Electronic Module (see Figure 5-2).
Chapter 5---Electronics Video Amplifier PCB - Inputs RGB_VIDEO - image pre-amp signals from the Video Processor PCB (about 0.5 Vpp). RESTORE - image DC restorations pulse from Video Processor PCB, logic level positive going 4% duty cycle. BLANKING - Blanking signal, logic F type. G1_SUPPLY - supply for G1 grid on CRTs from High Voltage Power Supply (about -150 V). G1_BIAS - brightness control line from Video Processor PCB (0-5 VDC). RGB_G2 - G2 (black level) control lines from Video Processor PCB (0-3.
Chapter 5---Electronics Figure 5-26 Video Amplifier PCB I/O Diagram Model 250 Service Manual 5-45
Chapter 5---Electronics Figure 5-27 Video Amplifier PCB I/O Diagram for the Video Processor PCB and CRTs. Video Amplifier PCB - Outputs RGB_BEAM - Cathode beam current sense lines (about 1 V per 100 µA). RGB_CATHODE - image output signal to CRTs (about 40 Vpp with peak voltage of 70 V). RGB_G1 - G1 voltage to CRTs (Blanking pulse to CRT). RGB_G2 - G2 voltage for CRTs (about 600-800 V). RGB_HEAT (pos.) - positive side of the CRT heater voltage (about 6.2 V).
Chapter 5---Electronics RGB_HEAT (neg.) - negative side of CRT heater voltage (ground level). ARC_GND - CRT ground back to High Voltage Power Supply (CRT Protection against arcing). /VA_OK - CRT Protection signal to the High Voltage Power Supply (low = good, high = bad). This signal is becomes /HV_ENA at the High Voltage Power Supply. Video Amplifier PCB - Operation Image Amplifier The main function of the Video Amplifier PCB is to amplify each of the image signals going to the cathode of the CRTs.
Chapter 5---Electronics The Video Amplifier PCB detects all the necessary supply voltages (+80 V, +15 V, and the +6.2 V) for the CRT and includes that as part of the /VA_OK signal. If any of the supply voltages is not present, /VA_OK goes high, again shutting down the G1 and G2 regulators. The /VA_OK goes out to the High Voltage Power Supply as the /HV_ENA.
Chapter 5---Electronics 5. Remove the green CRT by loosening the green CRT Holder Ring (see Figure 5-29). Perform this step with 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. The Green CRT Socket Connector is close to the rear of the projector. It is easier to disconnect it from the CRT after the CRT/Yoke Assembly is loose and moved away from the rear of the projector (see CAUTION below).
Chapter 5---Electronics 12. Disconnect the three Focus cables that run from the CRT Socket Connectors to the Focus connectors on the HVPS. NOTE: Observe that each of the three 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. 13. Loosen the six Pozi-drive Phillips-head screws that secure the Video Amplifier PCB to the projector frame. 14.
Chapter 5---Electronics 5.10 CRT/Yoke Assemblies CRT/Yoke Assemblies - Main Function ! CRTs converts image signal to image light ! Yokes provide horizontal and vertical deflection for CRTs ! Yokes provide x-axis and y-axis convergence correction for CRTs CRT/Yoke Assemblies - Inputs To Yokes H_RGB_YOKE (pos.) - top of red, green, and blue horizontal yokes. V_RGB_YOKE (pos.) - top of red, green, and blue vertical yokes. RGB_LOCK (pos.
Chapter 5---Electronics Image - image light that passes through Relay Lens and focuses on photosensitive layer on input side of ILA®. CRT/Yoke Assemblies - Operation The CRTs receive image signals that come from the VICs to the Video Processor PCB, to the Video Amplifier PCB. The image information drives an electron gun inside the CRT. The Cathode of the CRT is a small, metal oxide disk that covers the filament heater. The filament heater heats the Cathode causing it to emit electrons.
Chapter 5---Electronics CRT Mechanical Focus The CRT Mechanical focus is factory-set and normally will not require additional adjustment unless a CRT has been replaced. After replacing a CRT, reset the mechanical focus. After completing the CRT installation and mechanical focus, check the other CRTs for convergence and shading. Tools Needed 1.5-mm Hex-head wrench #0 Pozi-drive Phillips-head screwdriver To adjust the CRT Mechanical Focus: 1. Remove the rear cover. 2.
Chapter 5---Electronics Figure 5-29 CRT Mechanical Focus adjustments. 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. Tools Needed 1.5-mm Hex-head wrench #0 Pozi-drive Phillips-head screwdriver 3-mm Hex-head wrench To perform the CRT Rotation adjustment: 1. Remove the rear cover. 2. Power the projector ON and allow it to stabilize for at least 15 minutes. 3.
Chapter 5---Electronics 5. View the color for the CRT that requires rotation. Hide the other two colors. 6. 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 assembly and sets these values to the default levels so that CRT Rotation can be accomplished correctly. 7. In the Geometry menu, access Bow, Skew, Pincushion, and Keystone adjustments.
Chapter 5---Electronics CRT Electronic Focus The Electronic Focus is factory-set and normally will not need to be adjusted except after component replacement, maintenance, or if wide temperature variations exist between the factory and the field location. View one color at a time. Tools Needed Medium Phillips-head screwdriver To perform the Electronic Focus adjustment: 1. Remove the front and rear cover. 2. Power the projector ON and allow it to stabilize for at least 15 minutes. 3.
Chapter 5---Electronics CRT/Yoke Assemblies - Remove and Replace Three CRT/Yoke Assemblies are located in the CRT Assembly area below the card cage (see Figure 5-30). WARNING!!! Handle the CRT/Yoke Assemblies with extreme caution. If they are dropped, they can implode and flying glass can cause severe injury to personnel. Be careful not to bump or drop the CRT. Immediately after removal, place the CRT/Yoke in a safe area.
Chapter 5---Electronics NOTE: For the Green CRT/Yoke Assembly only, it is best to perform Step 10 with the CRT socket connector still connected to the Green CRT and the ground wire still connected from the CRT to the socket connector. Because the Green CRT socket connector is close to the rear of the projector, it is easier to disconnect the socket connector from the CRT after the CRT/Yoke Assembly is loose and moved away from the rear of the projector. Be careful not to break any of these connections.
Chapter 5---Electronics ! YPbPr (Optional) ! Quad Standard Decoder (Optional) ! Quad Standard Decoder/Line Doubler (Optional) The are three VICs slots on the Model 250, however the 4-Input RGBHV, and the Quad Standard Decoder/Line Doubler require two slots.
Chapter 5---Electronics RGBHV VIC - Inputs R - red image from source input (0.7-1.0 Vpp). G - green image from source input (0.7-1.0 Vpp). B - blue image from source input (0.7-1.0 Vpp). H - horizontal sync from source input V - vertical sync from source input +15 V - (not used) -15 V - (not used) +5.1 V - power for digital circuitry +5.1 V Stdby (not used) IIC CLK - IIC clock line IIC DATA - IIC data line IIC SINT - IIC interrupt line RGBHV VIC - Outputs RED_VIC - red image to the Video Processor PCB (0.
Chapter 5---Electronics Parts Needed RGBHV VIC p/n 102597 To remove the RGBHV VIC: 1. Power off the projector by IR Remote or PC, and allow the cooling fans to run until they shut off. 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord. 3. It is not necessary to remove the rear cover. 4. Disconnect the red, green blue, horizontal and vertical input BNC cables from the VIC. 5. Remove the two retaining screws from the faceplate of the VIC. 6.
Chapter 5---Electronics Figure 5-34 Graphics Enhancer Plus faceplate. Graphics Enhancer Plus VIC - Inputs R - red image from source input (0.7-1.0 Vpp). G - green image from source input (0.7-1.0 Vpp). B - blue image from source input (0.7-1.0 Vpp). H - horizontal sync from source input V - vertical sync from source input +15 V - power for analog circuitry -15 V - power for analog circuitry +5.1 V - power for digital circuitry +5.
Chapter 5---Electronics Graphics Enhancer Plus VIC - Operation The RGBHV VIC receives the separate red, green, blue image inputs and horizontal, and vertical sync inputs from the source input device. The image signals go to a image enhancement signal processor that peaks the black details, enhances white details, and minimizes white overshoot according to commands received from the IIC data bus from the System Controller PCB.
Chapter 5---Electronics 4-Input (Quad) RGBHV VIC 4-Input (Quad) RGBHV VIC - Main Functions ! Interface for four sets of Red, Green, and Blue image inputs ! Interface for four sets of Horizontal and Vertical synchronization pulses ! VIC selection by IIC Serial Data Bus ! LED indication of VIC selection Figure 5-35 4-Input (Quad) RGBHV VIC faceplate (two VIC slots ). 4-Input (Quad) RGBHV VIC - Inputs Four sets of inputs R - red image from source input (0.7-1.0 Vpp).
Chapter 5---Electronics IIC CLK - IIC clock line IIC DATA - IIC data line IIC SINT - IIC interrupt line Figure 5-36 4-Input (Quad) RGBHV VIC.
Chapter 5---Electronics 4-Input (Quad) RGBHV VIC - Outputs RED_VIC - red image to the Video Processor PCB (0.7-1.0 Vpp). GRN_VIC - green image to the Video Processor PCB (0.7-1.0 Vpp). BLU_VIC - blue image to the Video Processor PCB (0.7-1.0 Vpp). H_VIC - horizontal sync to the Video Processor PCB V_VIC - vertical sync to the Video Processor PCB /SEL_VIC - VIC select line to the Video Processor PCB 4-Input (Quad) RGBHV VIC - Operation The 4-Input (Quad) RGBHV VIC accepts four sets of RGBHV inputs.
Chapter 5---Electronics YPbPr VIC This decoder video input card (YPbPr_VIC) contains three BNC input connectors that can be used for two different inputs, YPbPr or GBR. The YPbPr PCB converts these component signals to RGB type image signals.
Chapter 5---Electronics Figure 5-38 YPbPr VIC faceplate. YPbPr VIC - Inputs YPbPr Inputs Y - green image input with composite horizontal and vertical sync (0.7-1 Vpp) Pb - blue image input for YPbPr (0.7-1 Vpp) Pr - red image input for YPbPr (0.7-1 Vpp) GBR Inputs Grn - green image input with composite horizontal and vertical sync (0.7-1 Vpp) Blu - blue image input (0.7-1 Vpp) Red - red image input (0.7-1 Vpp) +15 V - power for analog circuitry -15 V - power for analog circuitry +5.
Chapter 5---Electronics interface. An operator selects the VIC and input in the Channels Menu (see section 4-6 in the User’s Guide). The YPbPr VIC strips the sync pulses that are combined with the green image signal (Y in YPbPr mode) and sends them to the Video Processor PCB as a composite sync signal (H_SYNC). The Video Processor PCB separates the composite sync signal and sends it to the Raster Timing Generator PCB.
Chapter 5---Electronics Quad Standard Decoder VIC The Quad Standard Decoder VIC provides an interface for composite and S-Video formats input. It contains three BNC input connectors, one for Composite Video and two for S-Video (luminance and chrominance). This decoder VIC converts Composite and S-image formats to RGBHV format. Quad Standard Decoder VIC - Main Functions ! Select input source, Composite or S-video ! Select standard-AUTO/NTSC/PAL/SECAM/4.
Chapter 5---Electronics Quad Standard Decoder VIC - Inputs Comp - input for Composite image signal includes sync pulses (.07-1 Vpp) Yin - input for Luminance or brightness information of S-image (0.7-1 Vpp) Cin - input for Chrominance or color information of S-image (0.3-0.6 Vpp) +15 V - power for analog circuitry +5.
Chapter 5---Electronics when the S-image input is selected. Only one LED will be illuminated at one time. Neither LEDs will be illuminated when the Quad Standard Decoder VIC is not selected as the input to projector. Quad Standard Decoder VIC - Service Adjustments There are no physical service adjustments to the Quad Standard Decoder VIC.
Chapter 5---Electronics installed in the #2 or 3 VIC slot (it will not fit into the #1 slot), a blank face plate must be installed above it. The blank faceplate is not included with the Quad Standard Decoder/Line Doubler VIC unless it is installed at the factory. The part number for the blank faceplate is p/n 102667. Figure 5-41 Quad Standard Decoder/Line Doubler VIC faceplate with blank faceplate above it.
Chapter 5---Electronics 5.12 Backplane PCB The Backplane PCB is the spine of the Electronics Module. Every major electronic component in the Model 250 projector connects to and through the Backplane PCB. It is hidden in the inside of the Electronics Module (see Figure 5-2). The System Controller PCB, Raster Timing Generator PCB, Video Processor PCB and the three VICs are connected into it directly. All the other PCBs and Power Supplies are connected through jumpers and cabling.
Chapter 5---Electronics Figure 5-43 Backplane Diagram (middle section). The following is a list of pins that would be helpful for troubleshooting purposes. Low Voltage Power Supply (J8) High Voltage Power Supply (J7) Pin # 8 9 10 11 12 13 14 15 16 17 18 1-7 Signal or Voltage /LV_ENA /LV_OK +24 V_FANS _5.1 V Stdby +5.1 V +6.2 V +15 V -15 V +80 V /COVER_ON /FAN_ENA GND Pin # 5 8 9 10 11 12 1-4 Arc Lamp Power Supply (9) (28) Pin # 2 3 4 5 1, 6 (see Figure 5-44) Pin # Signal or Voltage 1 +5.
Chapter 5---Electronics Figure 5-44 Backplane Diagram (right side).
Chapter 5---Electronics Model 250 Service Manual 5-77
Chapter 6---Miscellaneous Items 6.0 Miscellaneous Items Contents 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.1 Projector Covers........................................................................................... 6-1 Electronics Module Tilt-up .......................................................................... 6-2 Ventilation.................................................................................................... 6-3 Air Filters ..................................................................
Chapter 6---Miscellaneous Items 5. When the Latch Levers are inserted into the holding slots, lift the cover off. Be careful not to brush against any of the internal components of the projector when removing the cover. If any undue resistance is felt, stop to locate the source before proceeding. 6. Replace the covers in reverse order. When replacing either cover, make sure the slot in the cover fits over the bottom of the projector case or the cover will not close correctly. 6.
Chapter 6---Miscellaneous Items Figure 6-1 Electronics Module hinge and locking mechanism. 6.3 Ventilation Adequate cooling is a major consideration for the Model 250 projector. There are thirteen cooling fans (including the Arc Lamp blower) in this projector. ! ! ! ! 4 fans in the main chassis - two in the rear of the projector, one in the right front corner and one on the bottom of the projector. These fans bring cool air into the chassis of the projector.
Chapter 6---Miscellaneous Items 6.4 Air Filters There are three polyurethane air filters in the Model 250. Air filters should be cleaned whenever necessary. In extremely dusty or dirty conditions, the filters should be cleaned more frequently. Remove the filters and vacuum them or blow them clean with compressed air. The air filters just slide out. No tools are required to remove and reinstall any of the air filters. They are located as follows: 6.
Chapter 6---Miscellaneous Items The EMI Shield is a metal plate located in front of the Low Voltage Power Supply and the Arc Lamp Power Supply. It must be removed before removing either of these power supplies. Be sure to replace the EMI Shield after replacing either the Low Voltage Power Supply or the Low Voltage Power Supply. 6.7 Cleaning Lenses, ILA® Assemblies and Mirrors The projection lens is the only item that requires periodic cleaning.
Chapter 6---Miscellaneous Items 6-6 Model 250 Service Manual
Chapter 7---Troubleshooting 7.0 Troubleshooting Contents 7.1 Safety............................................................................................................ 7-1 7.2 LEDs............................................................................................................. 7-2 Backpanel LEDs......................................................................................... 7-2 Video Processor PCB LEDs.......................................................................
Chapter 7---Troubleshooting Left/Right Orientation: When referring to the left or right 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. 7.
Chapter 7---Troubleshooting Figure 7-1 Rear Panel layout Control Out - The Control Out terminal is another RS232 port similar to the Terminal In port except that it can not be used to Import/Export setup data. Tethered Remote Jack - The Model 250 projector is shipped with an IR Remote Control. This IR Remote can be used with an optional 150 ft. cable that will plug in the Tethered Remote Jack. IR Detector - This sensor detects commands from the IR Remote Control included with the projector.
Chapter 7---Troubleshooting Figure 7-2 Dip Switch Block on System Controller PCB. Reset Switch - The Reset Switch resets the CPU if the projector locks up and does not respond to an IR Remote, PC or Laptop computer. If the rear panel is in place, the CPU can also be reset by cycling the AC Circuit Breaker off and back on again.
Chapter 7---Troubleshooting Video Processor PCB LEDs Figure 7-4 Video Processor Test Points and LEDs. Video Processor - Test Points The test points on the Video Processor PCB are visible and accessible from the left side of the Electronics Module when the rear projector cover is removed.
Chapter 7---Troubleshooting Sync - There are three sync test points: H sync for the horizontal sync pulse, V sync for the vertical sync pulse, and G sync, which is a combination of the horizontal and vertical sync pulses that are carried with the green image signal. External - There are three external image test points: R ext, for the red external image signal, G ext for the green external image signal, and B ext for the blue external image signal.
Chapter 7---Troubleshooting Raster Timing Generator PCB LEDs Figure 7-6 Raster Timing Generator LEDs.
Chapter 7---Troubleshooting Raster Timing Generator PCB LEDs Band LEDs The range horizontal scan frequencies accepted by the Model 250 projector is divided into four “bands”. The four LEDs (A, B, C, & D) toward the front of the projector on the Raster Timing Generator PCB indicate which range of horizontal scan frequencies the input source is operating.
Chapter 7---Troubleshooting Convergence Deflection PCB LED Figure 7-7 Convergence Deflection PCB LED. The Convergence Deflection PCB has only one LED. It illuminates green when power (±15 V) is present on the PCB.
Chapter 7---Troubleshooting Video Amplifier PCB LED Figure 7-8 Video Amplifier PCB LED. The VA_OK LED on the Video Amplifier PCB is illuminated green when all the CRT deflection circuits are operating properly (/DEFL_OK), the supply voltages (±15 V, +6.2 V, and +80 V) are present at the Video Amplifier PCB, and all the CRT Yoke connectors are properly installed (see Figure 7-15 and Figure 7-16).
Chapter 7---Troubleshooting Backplane PCB LEDs Figure 7-9 Backplane PCB LEDs on right side (exposed side)of PCB. The Backplane has two status LEDs, the /LV_OK signal from the Low Voltage Power Supply, and the /HV_OK signal from the High Voltage Power Supply. The Backplane also has several connectors that can be used for probing signals and voltages (see Figure 7-18 and associated signals and voltages).
Chapter 7---Troubleshooting 7.3 Diagrams Command ON Timing Figure 7-10 POWER ON and POWER OFF command timing diagram. When the AC Circuit Breaker is powered ON, the Low Voltage Power Supply generates a +5.1 V Standby voltage that goes to the System Controller PCB to power the CPU and IR Detectors. The Low Voltage Power Supply also puts out the +24 V Standby voltage (/FAN_ENA goes low) that provides power to the cooling fans.
Chapter 7---Troubleshooting to the Arc Lamp Power Supply low. The Arc Lamp Power Supply delivers 170 V to the Igniter, which generates a 32 kV pulse to the Arc Lamp and the Arc Lamp lights. Once the Arc Lamp lights, the Arc Lamp Power Supply, the /LAMP_LIT signal goes low and the voltage to the Igniter drops to between 25 V and 31 V. The voltage from the Arc Lamp Power Supply stays at a steady output of 2 kW during normal operation of the projector.
Chapter 7---Troubleshooting Image Path Figure 7-11 RGB Image path from VIC to CRT. The image signals can be in the form of separate red, green and blue component signals with separate horizontal and vertical sync signals or they can be a composite image signal with all the image and sync signals combined into one input signal. The image signals, if not already separate, are separated into red green and blue color components, and horizontal and vertical syncs in the VIC.
Chapter 7---Troubleshooting Deflection Path Figure 7-12 CRT Deflection path from Raster Timing Generator PCB. The Raster Timing Generator PCB receives the horizontal and vertical sync pulses from the Video Processor PCB, and uses a Phase Locked Loop circuit to lock to the horizontal sync.
Chapter 7---Troubleshooting The Horizontal Vertical Deflection PCB outputs H_OUT_FLYBACK to the Scan Reversal PCB. This is the horizontal deflection waveform that drives the horizontal CRT deflection yokes. The H_RED+, GRN+, and BLU+ are the horizontal deflection returns. The outputs of the vertical amplifier are V_RED+, GRN+, and BLU+. The returns are V_RED-, GRN-, and BLU-.
Chapter 7---Troubleshooting Figure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB, Convergence Deflection PCB and Scan Reversal PCB.
Chapter 7---Troubleshooting Figure 7-14 CRT Deflection path between the Scan Reversal PCB and CRT.
Chapter 7---Troubleshooting CRT Protection Figure 7-15 CRT Protection path The CRT Protection circuit is designed to protect the CRTs in case any of the CRTs is not receiving a horizontal or vertical deflection waveform. If there are no deflection waveforms, the electron gun inside the CRT will shoot an electron beam at the center of the CRT, burning a spot in the CRT phosphor that will be visible on the screen.
Chapter 7---Troubleshooting Amplifier PCB the /SWEEP_OK becomes the /VA_OK signal and checks the supply voltages such as +15 V, +6.2 V and +80 V. The /VA_OK LED illuminates (see Video Amplifier PCB LED) if the supply voltages are present and the /SWEEP_OK is low. The /VA_OK also goes to the High Voltage Power Supply. On the High Voltage Power Supply, a logical “high” shuts down the high voltage amplifier that generates the Anode, Focus, and G2 voltages.
Chapter 7---Troubleshooting Figure 7-16 CRT Protection path between the Scan Reversal PCB and CRT.
Chapter 7---Troubleshooting 7.4 Error Codes For certain errors that may occur in the Model 250 Projector the software provides error codes that are helpful in determining the nature of the problem. These error codes can be seen on the left side of the monitor screen when using a PC connected to Port A or Port B. Table 7-1 Error Categories: Category Number Error Category Description 1 CEXEC Operating System. 2 FLASH HW Flash Memory HW driver.
Chapter 7---Troubleshooting 1.34 “No mem available” Software error-no heap available for memory allocation. 2.1 “Invalid Sector” Software error-invalid 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.
Chapter 7---Troubleshooting 4.17 “VIC1 Board Not OK” /VIC_OK is High (BAD) on VIC Slot 1. 4.18 “VIC 2 Board Not Ok” /VIC_OK is High (BAD) on VIC Slot 2 4.19 “VIC3 Board Not OK” /VIC_OK is High (BAD) on VIC Slot 3 4.20 “VIC1 Invalid Type” Software does not support VIC_ID in Slot 1 4.21 “VIC2 Invalid Type” Software does not support VIC_ID in Slot 2 4.22 “VIC3 Invalid Type” Software does not support VIC_ID in Slot 3 4.23 4.
Chapter 7---Troubleshooting 7.5 Troubleshooting Guide Table 7-3 lists some common projector problems, what to check when problems occur, and offers possible solutions. It indicates the section in this Service Manual that provides some related information on the problem. If the User’s Guide contains pertinent information, the appropriate section will be given. Table 7-3 Troubleshooting Guide Problem No Power No Picture Arc Lamp Check Main Circuit Breaker on Projector rear panel.
Chapter 7---Troubleshooting Troubleshooting on the Backplane PCB The connectors on the Backplane PCB provide one of the more accessible places to probe voltages and signals that may be useful for troubleshooting purposes (see Figure 7-18 and associated list of signals and voltages).
Chapter 7---Troubleshooting Figure 7-18 Backplane Diagram (middle section) The following is a list of pins that would be helpful for troubleshooting purposes. Low Voltage Power Supply (J8) High Voltage Power Supply (J7) Pin # 8 9 10 11 12 13 14 15 16 17 18 1-7 Pin # 5 8 9 10 11 12 1-4 Signal or Voltage /LV_ENA /LV_OK +24 V_FANS _5.1 V Stdby +5.1 V +6.
Chapter 7---Troubleshooting Figure 7-19 Backplane Diagram (right side) 7-28 Model 250 Service Manual
Chapter 7---Troubleshooting Model 250 Service Manual 7-29
Chapter 8---Software and Protocol 8.0 Software and Protocol Contents 8.1 Software Updating........................................................................................ 8-1 8.2 Importing/Exporting..................................................................................... 8-5 Configuration ............................................................................................. 8-5 Exporting..............................................................................................
Chapter 8---Software and Protocol Cursor=Block & Blink ! Terminal Font=Fixedsys 15 ! Translation=None, ! Show Scroll Bars=On ! Buffer Lines=100 ! Use Function Arrow ! Control Keys for Windows=Off Select OK. ! 6. Under Settings select Text Transfer=Standard Flow Control. Select OK. 7.
Chapter 8---Software and Protocol ***WARNING: IMPROPER USE MAY MAKE THIS SYSTEM UNBOOTABLE*** (This warning relates to the Flash Memory updating that occurs in Step 11D. Do not turn projector power off while the Flash Memory is updating) Memory buffer reset to 0xff Begin your S-Record upload now (Esc to abort). 11B.
Chapter 8---Software and Protocol Boot Manager Ver y.y.0 (Service Mode Startup) Copyright (c) 1994-1996 Hughes-JVC Technology Command: _ 12A. To update the System Software from the Boot Manager prompt: 12B. Type in the command “loadsys” at the prompt. The following should be displayed: Command: loadsys System software update procedure ***WARNING: IMPROPER USE MAY MAKE THIS SYSTEM UNBOOTABLE*** (NOTE: This warning relates to the Flash Memory updating that occurs in Step 12D below.
Chapter 8---Software and Protocol The software update is complete. To restart the projector, type in the “sys” or “reboot” command and press Enter. The projector will now restart with the updated System Software. 8.2 Importing/Exporting Configuration Data Export / Import Procedure - Rev 1.0.0 This appendix defines the steps to perform a Configuration Data Export & Import from the Model 250 projector to a Host Computer.
Chapter 8---Software and Protocol Exporting 1. Make sure the Windows TERMINAL program is configured for SOFTWARE FLOW CONTROL (XON/XOFF). A corrupt Export file will result if SW flow control is not used. 2. Choose the directory and filename for saving the Export Data. The Windows TERMINAL: Transfers: Receive Text File... dialog box will default to the c:\windows directory and no file. Create a directory (like \TEMP) (or have an existing one in mind) before starting the export process. 3. Model 250 Menu: 7.
Chapter 8---Software and Protocol . END A similar message is displayed on the projector screen : ================================= | Export Configuration | | EXPORT COMPLETE | | -> STOP Host Download | | -> THEN Press ESC | ================================= 10. Windows TERMINAL: Select the Windows TERMINAL STOP button with the mouse to end the Receive Text File... transfer. 11. Model 250 Menu: Press Esc to exit the projector Export operation and return to the Maintenance Menu. Importing 1.
Chapter 8---Software and Protocol | Import Configuration | | Start SEND TEXT Upload from | | Host on Serial PORT A | | -To Abort: | | ->Stop 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.
Chapter 8---Software and Protocol 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 250 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 end the Host Upload transfer.
Chapter 8---Software and Protocol 8.3 Terminals and Communication Protocols Terminals The projector can be controlled by a VT-100 terminal. If a VT-100 is not available, a PC with Windows 3.1 or ProComm for DOS can emulate a VT-100. Table 8-1 shows the equivalent commands for the terminal and both remotes. 1. From Windows Program Manager, select TERMINAL then SETTINGS. 2. Select TERMINAL EMULATION from SETTINGS menu. 3. Select DEC VT-100 (ANSI) (may already be selected). 4.
Chapter 8---Software and Protocol Communications Protocol Select SETTINGS using the menu bar, then select COMMUNICATIONS. Set the following communications parameters and modes. Table 8-2 Communications settings Baud Rate 9600 Stop Bits 1 Data Bits 8 Flow Control Xon/Xoff Parity None Carrier Detect No Parity Check No Connector Com1-This is PC configuration dependent. Select FILE from the menu bar and select NEW. Under File Name enter VT100.TRM.
Chapter 8---Software and Protocol Center, H & V (RGB) Change channel Color Contrast (RGB) Edge, H & V (RGB) Enter Escape Hide Keystone, H & V Lens adjust Linearity, H &V (RGB) Menu Mode Numeric Onscreen Phase Picture sharpness Picture tint Pincushion, H &V RGB toggle Size, H & V Test pattern display Skew, H & V (RGB) Threshold Sensitivity Registration Redraw Terminal Screen Reboot** Restart System Software*** 8-12 P POS 80 50 Number + Enter Y C E Channel # + Enter COLOR CONT Channel # + Enter COLOR
Chapter 8---Software and Protocol *The Arrow keys are a sequence of Decimal or Hex numbers representing the sequence of Escape, Left Bracket, and A, B, C, or D depending on which arrow Is pressed. The first number represents the Escape key, the second number represents the Left Bracket, and the third number represents the letter corresponding to the Arrow Key pressed. **Refer to Section 8.1, Software Updating.
Chapter 8---Software and Protocol 8-14 Model 250 Service Manual
Chapter 9---Parts List 9.0 Parts List Contents 9.1 Replacement Parts List................................................................................. 9-1 9.2 Spares ........................................................................................................... 9-3 9.1 Replacement Parts List Table 9-1 Replacement parts list Description Arc Lamp Module Cathode Ray Tube (CRT) Contrast Enhancer CRT/Yoke Assembly Ignitor Assembly, (Ignitor & Laser P.S.
Chapter 9---Parts List Description Power Cord, USA/Japan Power Cord, Europe Power Supply, Arc Lamp Power Supply, High Voltage Power Supply, Low Voltage Prism Tank Assembly Projection Lens, 0.96:1, Fixed Projection Lens, 1.5:1, Fixed Projection Lens, 2.4:1, Fixed (Simulator) Projection Lens, 5.6:1, Fixed Projection Lens, Zoom (2:1 - 4:1) Remote Control, Executive Remote Control, Service Remote Control, Tethered Technician Yoke Assembly, CRT 9-2 Part no.
Chapter 9---Parts List 9.2 Spares It may be advisable to maintain a supply of spares for the projector to minimize downtime. This is particularly important when projectors are being operated on a continuous basis or when multiple projectors are needed. Table 9-2, below, provides a list of the spares that HJT recommends for one to four projectors. Table 9-2 Recommended minimum spares Part no.
Chapter 9---Parts List 9-4 Model 250 Service Manual
Glossary Glossary of Terms Amorphous Without definite form; not crystallized. Arc Lamp The high intensity light source in the Model 250 projector. The Xenon Arc Lamp operates at high temperatures (160° to 200°) and produces dangerously intensive light with hazardous levels of ultraviolet and infrared radiation. Aspect Ratio The ratio of the picture width to picture height. The standard U.S. television aspect ratio is four units wide to three units high (4:3).
Glossary A-2 Field One half of a complete video frame. Odd lines in one field and even lines in another make up one frame. Frame One complete TV picture or screen of information. It is composed of two fields and has a total of 525 scanning lines in NTSC transmission. Horizontal Scan Reversal Jumper Reverses the image projection for front or rear projection. Located on the Horizontal Deflection Board and Scan Reversal PCB. Horizontal Size Coils Adjustment coils on the Scan Reversal Board.
Glossary Lumen A unit of measure of the flow, or rate of emission, of light measured with a Light Meter. An ordinary wax candle generates 13 lumens while a 100-watt bulb generates 1,200 lumens. Luminance Abbreviated as "Y." The portion of the YPbPr and S-image signal that contains the black and white information, which affects brightness. Noise An undesirable electrical interference of a signal. Overscanning Displaying less than the complete area of an image to a viewer (i.e.
Glossary A-4 S-Video An image signal that has the luminance (Y) information separated from chrominance (C) information. Saturated Color 1) A color as far from white, black or gray as it can be (i.e., vermilion rather than pink). 2) A display misadjustment that results in unnaturally bright colors. Scan To scan, is to move across the image frame, one line at a time, either to detect the image, as in an analog or digital camera, or to refresh a CRTbased display.
Glossary alternating white and black horizontal lines that can be counted from the top of the picture to the bottom. Vertical Scan Frequency Vertical Scan Reversal Jumper The number of times per second a display image is written or refreshed. Reverses the image vertically for use with mirror-bounced displays. Located on the Scan Reversal PCB. Vertical Synchronization Frequency The number of times per second a frame is transmitted to a video display screen. Xenon Arc Lamp See Arc Lamp.
