Hughes Model 230 Projector Service Manual
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Chapter 1---Introduction Model 230 Service Manual1-3 RAM Random Access Memory RGB Red, Green and Blue RGBHV Red, Green, Blue, Horizontal, Vertical ROM Read Only Memory RTG Raster Timing Generator SCB System Controller 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...
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Chapter 1---Introduction 1-4 Model 230 Service Manual
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Chapter 2---System Description Model 230 Service Manual2-1 2.0 System Description Contents 2.1 Introduction ..............................................................................................2-1 2.2 Optical System .........................................................................................2-2 2.2.1 Image Path ...................................................................................2-2 2.2.2 Arc Lamp Light Path...
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Chapter 2---System Description 2-2Model 230 Service Manual cabling. It also contains the Backplane board which is used to electrically interconnect the printed circuit boards, power supplies and other units in the projector, and the Video Input Cards that interface with different kinds of input signals. • The CRT Section is located beneath the electronics card cage and contains the 3 CRTs, 3 Relay Lenses, 3 ILA®s and the Video Amplifier Board. 2.2 Optical System Introduction: The Model 230 Optics...
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Chapter 2---System Description Model 230 Service Manual2-3 (changing its polarization) by the signal on the input side of the ILA® assembly. The light is then reflected back from the output side of the ILA® assembly, then travels through the prism to be picked up by the projection lens. NOTE: The prism reflects horizontally polarized light and passes vertically polarized light. Light from the arc lamp is polarized horizontally and reflects from the prism into the ILA® assembly then back out again, after...
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Chapter 2---System Description 2-4Model 230 Service Manual 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-current electrical arc to produce the intense, white light used in the Model 230 projector. First Condensing Lens: The high intensity light output from the Xenon Arc Lamp goes through the First Condensing Lens (attached to the rear of the Arc Lamp housing)...
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Chapter 2---System Description Model 230 Service Manual2-5 Figure 2-1. Optical System Block Diagram
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Chapter 2---System Description 2-6Model 230 Service Manual 2.3 Electronics System 2.3.1 General Description The Model 230 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). The Electronics System also controls video and sync input signals, LED displays on PCBs at the rear and side of the projector, two RS-232 communications...
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Chapter 2---System Description Model 230 Service Manual2-7 2.3.2 Power Supplies The Model 230 includes three power supply assemblies. • Low Voltage Power Supply • Arc Lamp Power Supply • High Voltage Power Supply Low Voltage Power Supply (LVPS) P75P76 1 3 51-7 8 9 10 11 12 13 14 15 16 17 18To P8 on Backplane AC INPUTLine Earth NeutralLV Ret /LV_ENA /LV_OK +24v Fans +5.1v STBY +5.1v +6.2v +15V -15v +80V /COVER_ON /FAN_ENA Figure 2-3. LVPS Input/Output Diagram Main Functions: • Provide all the low...
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Chapter 2---System Description 2-8Model 230 Service Manual /LV_OK: When /LV-ENA is enabled, this diagnostic signal indicates to the System Controller the status of the non-standby supply (all outputs working or not working). Operation: The main power is filtered via the input filter to prevent radiation from escaping back to the power line. From the line filter, AC power is fed into the Low Voltage Power Supply module where AC is rectified, filtered, and compensated for power factor correction. The +5.1V...