Hughes JVC Projector 250 Service Manual
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Chapter 8---Software and Protocol 8-14 Model 250 Service Manual
Chapter 9---Parts List Model 250 Service Manual 9-1 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 Part no. Arc Lamp Module 106298 Cathode Ray Tube (CRT) 105199 Contrast Enhancer 104247 CRT/Yoke Assembly 105384 Ignitor Assembly, (Ignitor & Laser P.S.) 106570 ILA®, SM Moving 3 x 4 Video (High Contrast) Add for Blue -14, for Green -15, for Red -16.102630 Lens, Relay 106533 Manual, Operation (User’s Guide) 106785 Manual, Service 106784 PCA Convergence Deflection 105210 PCA Horizontal/Vertical Deflection 106838 PCA Raster Timing Generator 105238 PCA System Controller 104678 PCA Video Amplifier 105232 PCA Video Processor 105234 PCA, Backplane 102595 PCA, Graphics Enhancer Plus RGBHV VIC 106183 PCA, RGBHV VIC 102597 PCA, YPbPr VIC (Option) 106340 PCA, 4-Input (Quad) RGBHV VIC (Option) 103668 PCA, Quad Standard Decoder VIC (Option) 103545 PCA, Quad Standard Decoder/Line Doubler VIC (Optional105376 PCA, Scan Reversal 102585
Chapter 9---Parts List 9-2 Model 250 Service Manual Description Part no. Power Cord, USA/Japan 104499 Power Cord, Europe 103939 Power Supply, Arc Lamp 105216 Power Supply, High Voltage 102566 Power Supply, Low Voltage 102520 Prism Tank Assembly 103942 Projection Lens, 0.96:1, Fixed 105134 Projection Lens, 1.5:1, Fixed 106687 Projection Lens, 2.4:1, Fixed (Simulator) 103592 Projection Lens, 5.6:1, Fixed 104337 Projection Lens, Zoom (2:1 - 4:1) 103746 Remote Control, Executive 105576 Remote Control, Service 105575 Remote Control, Tethered Technician 105245 Yoke Assembly, CRT 103467
Chapter 9---Parts List Model 250 Service Manual 9-3 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. Description Quantity 105236 PCA Horiz/Vert Deflection 1 105210 PCA Conv/Defl 1 105232 PCA Video Amplifier 1 105234 PCA Video Processor 1 104678 PCA System Controller 1 105238 PCA Raster Timing Gen. 1 102585 PCA Scan Reversal 1 102597 PCA Graphics Enhancer Plus VIC1 102520 Low Voltage Power Supply 1 105216 Arc Lamp Power Supply 1 102566 High Voltage Power Supply 1 106298 Arc Lamp Module 1-4
Chapter 9---Parts List 9-4 Model 250 Service Manual
Glossary Model 250 Service Manual A-1 Glossary of Terms AmorphousWithout definite form; not crystallized. Arc LampThe 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 RatioThe 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). BandwidthBandwidth is the difference between the lowest and highest frequencies transmitted or received. In digital formats it is measured in bits per second and in communications, it is measured in Hertz. Wider bandwidth provides more information or picture detail capability. ChrominanceAbbreviated as “C”. The portion of the YPbPr and S-image signal that contains the color information signal. Cold MirrorMirror that absorbs infrared light so that its reflection contains only “cold light” or light that does not transmit appreciable heat. Because of this absorption of infrared heat radiation, “cold mirrors” get quite hot. Cross-member AssemblyAssembly attached to the main chassis that crosses over the top of the midsection of the projector. Used to mount the front and rear covers. CRT (Cathode Ray Tube)The Cathode Ray Tube is used as a display screen in televisions and computer monitors. Commonly referred to as the picture tube. The Model 250 projector uses three CRTs. Dichroic MirrorsThe white light of the xenon arc lamp is separated into red, green and blue by means of dichroic beamsplitters that reflect only one color and pass all others.
Glossary A-2 Model 250 Service Manual FieldOne half of a complete video frame. Odd lines in one field and even lines in another make up one frame. FrameOne 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 ScanReverses the image projection for front or rear Reversal Jumperprojection. Located on the Horizontal Deflection Board and Scan Reversal PCB. Horizontal Size CoilsAdjustment coils on the Scan Reversal Board. Used to adjust the horizontal size (width). Hot SpotThe Arc Lamp’s brightest area on the screen. Used to align and focus the Arc Lamp. HueAlso referred to as tint. A specific color such a blue, pink or aqua. Hue or tint control on a display device adjusts red/green balance. IgnitorProvides a momentary high voltage to excite the gases in the Xenon Arc Lamp to ignite. Image Light Amplifier A device that uses low-intensity images to phase ILA ®modulate a 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 MirrorAlso referred to as a “Steering Mirror”. It directs the blue and red images toward the Combining Prism. InterlacingThe 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 DetectorThe Model 250 Projector has two I/R Detectors, one in front, one in back. These windows receive projector control signals from the I/R Remote Control. Laser Power SupplyProvides boost voltage through a spark gap to the Ignitor.
Glossary Model 250 Service Manual A-3 LumenA 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. LuminanceAbbreviated as Y. The portion of the YPbPr and S-image signal that contains the black and white information, which affects brightness. NoiseAn undesirable electrical interference of a signal. OverscanningDisplaying less than the complete area of an image to a viewer (i.e., scanning beyond the visible area). All TV sets are overscanned at least slightly, so that viewers do not see blanking. RasterThe area illuminated by the scan lines on a CRT. ResolutionThe degree of sharpness of a displayed or printed character or image. The amount of detail in a picture. On a display screen, resolution is expressed as the number of horizontal dots (columns) by the number of vertical lines (rows). For example, a 680 x 400 resolution means 680 dots across each of 400 lines. RetraceThe blanked-out line traced by the scanning beam 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 turned on high, white is produced. When all dots are turned off, the base color of the screen appears. S-VHSA high band video recording process for VHS that increases picture quality and resolution capability. S-VHS tape machines use a special output terminal that allows separate output of luminance (Y) and chrominance (C) picture information to monitors equipped with S-image inputs.
Glossary A-4 Model 250 Service Manual S-VideoAn image signal that has the luminance (Y) information separated from chrominance (C) information. Saturated Color1) 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. ScanTo 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 CRT- based display. Scan LineOne horizontal line in a graphics frame. Scan RateThe frequency or times per second one line is scanned across an image display device such as a CRT. SynchronizationAlso called “sync” for short. Pulses that time the display of image information to the horizontal and vertical CRT deflection. Signals included with the source input that control the monitors scan circuits to properly time the lines and frames of a picture. Source inputThe source of image and sync signals being input into the projector. Typical source inputs are: Computers, VCRs, Image generators, Satellite feed. Technician RemoteRemote control used during Model 250 setup and adjustment. Alternative to Standard Remote. Provides access to many of the setup functions by direct keys instead of by menu maneuvering. Throw DistanceDistance from the projector to the screen. UnderscanDecrease raster size horizontally and vertically so that all four edges of the picture are visible on the display. Vertical Height PotsPotentiometers located on the Horizontal/Vertical Deflection PCB. Used to adjust vertical height. Vertical ResolutionThe amount of detail that can be perceived in the vertical direction. The maximum number of
Glossary Model 250 Service Manual A-5 alternating white and black horizontal lines that can be counted from the top of the picture to the bottom. Vertical Scan FrequencyThe number of times per second a display image is written or refreshed. Vertical ScanReverses the image vertically for use with Reversal Jumpermirror-bounced displays. Located on the Scan Reversal PCB. Vertical SynchronizationThe number of times per second a frame is Frequencytransmitted to a video display screen. Xenon Arc LampSee Arc Lamp.