SERVICE MANUAL Model 330 Model 340 SC Model 370 SC Hughes-JVC Technology Corporation 2310 Camino Vida Roble, Carlsbad, CA 92009-1504 ☎ 760-929-5300 FAX 760-929-5410 e-✉ service@hjt.
Manufacturer: Hughes-JVC Technology Corporation 2310 Camino Vida Roble Carlsbad, CA 92009-1504 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.
Safety Safety Information Introduction Before operating or working on a Model 330, 340SC and 370SC Projector, especially with the cover off, please read this safety information section thoroughly. Procedures requiring the opening of the projector covers and/or contact with electrical components should be performed by qualified service personnel. Strictly adhere to all notes and warnings.
Safety must accept any interference received including interference that may cause undesired operation. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at their own expense. Shielded interconnect cables must be used with this equipment to insure compliance with the pertinent RF emission limits governing this device.
Safety Avoid Projector Angles of 15° to 23° Due to voids in the prism fluid there is a dead zone of 19° ± 4°. For this reason, avoid projector angles of 15° to 23°. Maximum Projector to Screen Angle is 15° The maximum vertical tilt angle from projector to screen is 15°. This is the maximum amount of keystone correction that is possible. Heat Safeguards Fans The projector has multiple fans (exact number varies with projector model number) to cool the projector system.
Safety WARNING!!! High temperature, ultraviolet and infrared light. Refer all service to factory authorized personnel. Ultraviolet radiation, dangerous glare, and high internal gas pressure is present at the Xenon Arc Lamp. It is contained in a protective reflector housing module. DO NOT operate the Xenon Arc Lamp outside its intended standard housing or outside of the projector.
Safety ! ! ! ! CRT yoke assemblies and other proximity electrical assemblies, components and wiring—if performing the yoke rotation or width adjustment (outlined in Section 3.2), always use an ANSI/ASTM 10,000 volt rated safety glove. Periodically check the condition of safety gloves for cracks. Arc Lamp main power ± posts. Power Supply The projectors operate from power sources indicated in the table below.
Safety WARNING!!! Various procedures in this manual involve the removal and replacement of system subassemblies. Ensure that the projector AC power plug is removed from the AC outlet prior to attempting any of these procedures.
Safety xi Model 330, 340SC, and 370SC Service Manual
Chapter 1---Introduction 1.0 Introduction This Model 330, 340SC and 370SC Service Manual combines three (3) similar projector models into one (1) reference book, and should be used in conjunction with the appropriate projector Operator’s Manual.
Chapter 1---Introduction RTG SCB SPS TTL VAB VCO VDB VIN VPB VSYNC VTR Raster Timing Generator System Control Board System Power Supply Transistor-Transistor Logic Video Amplifier Board Voltage Controlled Oscillator Vertical Deflection Board Video Input Video Processor PCB Vertical Sync Video Tape Recorder 1.2 Safety High voltages and high intensity light sources exist in the Model 330, 340SC and 370SC Projector Systems and power supplies.
Chapter 1---Introduction Printed Circuit Boards 330 340SC 370SC Video Amplifier Board 103774 103774 103774 System Controller Board 104668 104668 104668 Table 1-2 Projector Model Comparisons 330 Model 340SC Model 370SC Model Different 3,000 lumens 4,200 lumens 6,800 lumens 2,500 ANSI lumens 3,700 ANSI lumens 6,000 ANSI lumens 220V AC, 20A, 60Hz 220V AC, 20A, 60Hz 220V AC, 30A, 60Hz 2,700 Watts power 3,325 Watts power 4,550 Watts power 1,500 W Xenon arc lamp 2,000 W Xenon arc lam
Chapter 2—Functional Descriptions 2.0 Functional Descriptions Contents 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Cover and Base............................................................................................2–2 External Power Requirements.....................................................................2–3 Electronics Systems Overview....................................................................2–3 System Power .................................................................................
Chapter 2—Functional Descriptions Low Voltage Power Supply Line Voltage System Power Supply Arc Lamp Lamp Ignitor RS 232 Infrared Remote Channel 1 System Controller Horizontal Deflection Video Processor Channel 2 Video Output Amplifier CRTs (3 each) (R,G,B, H/V Sync) Raster Timing Generator Vertical Deflection and Convergence High Voltage Power Supply Fans Image Light Amplifiers (3 each Figure 2-1 Model 330, 340SC and 370SC System Block Diagrams 2.
Chapter 2—Functional Descriptions WARNING!!! The HJT Model 330, 340SC and 370SC projectors use high voltages and high currents. Operation with covers removed exposes personnel to these dangerous conditions and may result in serious injury or death. No user-serviceable parts are contained within the projector. Refer all maintenance to only factory authorized and trained technicians. The projector cover is a two-piece molded assembly.
Chapter 2—Functional Descriptions horizontal and 45Hz to 120Hz vertical. The projected image is continuously variable from 6 ft to 60 ft over throw distances (varies by projector model) from 10 ft to over 360 ft. All HJT Series 300 projectors are capable of keystone, pincushion, and linearity correction. The projectors feature digital control of functions, including convergence, picture adjustments, switching and diagnostics.
Chapter 2—Functional Descriptions The Raster Timing Generator provides timing signals to the System Controller Board, selects the appropriate incoming sync signal and produces the timing signals for controlling the geometry of the raster. The Vertical and Horizontal Deflection Boards produce their respective sweep currents to drive the deflection yokes. The Vertical Deflection Board also houses the convergence amplifiers that drive correction coils.
Chapter 2—Functional Descriptions All of the SPS output voltages except Arc Lamp power are indicated by a LED display (see ). The LEDs are located on a bar-type display on the backplane at the left side of the card cage. The individual LEDs will be lit when the corresponding voltage is energized. The LEDs are wired to the SPS output power using only a current limiting resistor so when the LED is lit, it is an indication that there is a voltage present, not necessarily the correct voltage.
Chapter 2—Functional Descriptions The Arc Lamp power supply is a current-controlled supply with an open circuit voltage of about 170V. When the Arc Lamp is operating at steady state, the power supply provides the current set by the technician. The output of the supply has a large capacitor that will, on initial ignition of the Arc Lamp, provide the very high initial current necessary to ionize the xenon gas in the lamp and sustain the arc.
Chapter 2—Functional Descriptions 2. +24V Standby and Arc Lamp power supplies turn on. 3. When Arc Lamp lights (run voltage sensed by a window comparator in the SPS), SPS pulls /LAMPLIT line low. 4. SCB senses /LAMPLIT low and awaits further instructions. Electronics only power-up: 1. Upon receipt of Electronics-On command, SCB pulls /FANENBL and /LVPSNBL lines low. 2. +24V Standby and Low voltage supplies turn on. 3.
Chapter 2—Functional Descriptions *Current depends on projector model (see Table 0-1 in Safety Chapter). ** Model 340SC = 2000 Watts; Model 370SC = 3000 Watts. Figure 2-4 System Power Supply Input/Output Diagram Arc Lamp Ignitor The ignitor consists of a step-up power supply, a spark gap, and a transformer. The Arc Lamp Ignitor is mounted under or next to the Arc Lamp.
Chapter 2—Functional Descriptions When the Arc Lamp supply first turns on, it supplies 170V to the ignitor. The ignitor then senses this voltage, activates it’s on-board supply, and produces a 1µS, 38KV pulse to the Arc Lamp. This pulse strikes an arc in the lamp. The Arc Lamp supply then provides the high current necessary to sustain the arc in the lamp. Refer to Figure 2-5 and the summary below for a description on the Arc Lamp and Ignitor timing.
Chapter 2—Functional Descriptions High Voltage Power Supply The High Voltage Power Supply is a DC-DC converter (see Figures 2-6 and 2-7) and is located on the left side of the CRT housing. It provides all necessary voltages for the CRTs except the cathode drive, which comes from +107V from the SPS. Figure 2-6 High Voltage Power Supply Input power is +24V at 5A from the SPS. The input power is converted into the high voltage necessary to bias the CRTs.
Chapter 2—Functional Descriptions The HVPS provides several voltages to the CRTs: Anode Grid 1 Grid 2 Focus +24v 2 GROUND 3 HDFOCUS 11 HDFOCUS RTN 8 VDFOCUS 12 VDFOCUS RTN 9 /HVEN 7 RED ANODE GREEN ANODE BLUE ANODE High Voltage Power Supply RED FOCUS GREEN FOCUS BLUE FOCUS RED G2 GREEN G2 BLUE G2 -200v 6 (Pins 1,4,5,10 not used) Power and Control Connector Figure 2-7 High Voltage Power Supply Input/Output Diagram 3 6 9 12 2 5 8 11 1 4 7 10 Figure 2-8 HVPS Power and Control
Chapter 2—Functional Descriptions CRT anode voltages are not user controllable. They are fixed at 32KV with a maximum output of 2.1mA total or 0.7mA per CRT. The anode voltage is the primary acceleration voltage for the CRT. Other bias voltages (screen grid, G2, and control grid, G1) are used to control the level of beam current. The anode voltage is routed out of the top of the HVPS, into the CRT housing to three (3) bulkhead connectors.
Chapter 2—Functional Descriptions As with the other indicators on that LED bar, the LED is in series with current limiting resistor, so a lit LED indicates only the presence of a voltage, not necessarily the correct voltage. The control grid, G1, voltage is regulated to -81V during normal operation. During blanking, G1 is pulled to -111V. When the CRTs are disabled for protection, G1 is pulled to its maximum negative level of -200V, which can be measured, at the control connector, pin 6. 2.
Chapter 2—Functional Descriptions The card cage is hinged in the rear to allow it to be folded backward for access to the CRT housing (when folding the card cage backward be sure that nothing is plugged into the rear electronic jacks or the plugs could be severely damaged). During normal operation, the card cage should be in its upright position to ensure proper cooling of the CRT enclosure.
Chapter 2—Functional Descriptions Figure 2-10 on the following page provides an overall view of how the raster is produced. Details on the individual PCBs are provided in separate sections in this chapter.
Chapter 2—Functional Description Figure 2-10 Raster Generation Block Diagram Model 330, 340SC and 370SC Service Manual 2-17
Chapter 2—Functional Descriptions Raster Timing Generator Board (RTG) p/n 100568 The Raster Timing Generator board is located in the electronics card cage and plugs into the backplane. It is the second board from the rear of the card cage and consists of a main board and the PLL daughter board (see Figure 2-11). The PLL board must be installed for the projector to operate. Figure 2-11 Raster Timing Generator Block Diagram 2-18 Model 330.
Chapter 2—Functional Description The following functions are provided by the RTG: Internal sync generation. Sync detection and selection. Serration and equalization pulse removal. Timing clock pulse generation. VSYNC separation and field detection. Timing for several geometry and correction functions. Serial communication with the SCB. The block diagram ( see Figure 2-11) description, along with the I/O description in the Section following, provide information for module-level troubleshooting.
Chapter 2—Functional Descriptions Serration and Equalization Lockout The Serration and Equalization Lockout takes a composite sync signal and removes any equalization and serration pulses from it. The Model 330, 340SC and 370SC projectors do not require these pulses to operate. Removal of the serration and equalization pulses provides a faster, more reliable response to the vertical sync and subsequent relock to horizontal sync.
Chapter 2—Functional Description shaped to be three (3) horizontal periods in length. This signal, /VSYNCSC (pulseshaped vertical sync) is then sent to the SCB and the VPB. Adjustment Counters The adjustment counters implement the following timing functions: Left side, right side, top side, and bottom side blanking. Vertical and horizontal timing for convergence correction and overlay. Pincushion and linearity correction timing. Vertical phase. DC restore timing.
Chapter 2—Functional Descriptions method as the /CORSTRT signal but has a separate command from the SCB. It controls the timing of the top and bottom pincushion correction, top and bottom keystone correction, and horizontal linearity correction. The signal timing is selected by the user and controlled by the SCB. Adjusting PINCUSHION POSN under the TIMING SETUP MENU controls it.
Chapter 2—Functional Description I I I T Blank B Blank /STBP I DC Restore Delay I I I Internal Sync Forced Correction Start Delay Pincushion Start Delay I I O O O O 2H Sync Enable Shifted Sync Enable /External Sync Detect HCount /Phase Lock Phase Count Commanded position of top blanking. Commanded position of bottom blanking. Command for DC restore timing on either leading or trailing edge of sync pulse. Commanded timing of DC restore after reference edge of sync pulse.
Chapter 2—Functional Descriptions /Hx112 /CORSTRT /FRAMEST INTI /VSYNCSC /FIELD1 /MAPST I/O IICDATA 112 times the horizontal frequency for convergence and Z axis correction address generator clocking. (TP 20) Signal used to start the convergence and overlay address generators during each horizontal sweep. (TP 4) Indicates the beginning of a frame. Used in the SCB for counting vertical frequency. (TP 5) Indicates when input source signal is interlaced.
Chapter 2—Functional Description System Power Supply Inputs +15V -15V +5V AGND DGND Description Power for the analog section of the RTG including the PLL. (TP 30) Power for the analog section of the RTG including the PLL. (TP 29) Power for the digital portions of the RTG. (TP 3) Return for +/-15V, separated from DGND by an inductor. Return for +5V, separated from AGND by an inductor.
Chapter 2—Functional Descriptions Figure 2-12 Horizontal Deflection Board Block Diagram Vertical Oscillator The function of the vertical oscillator is to lock to the vertical signal, /VFBST, sent by the RTG, and produce a pulsed output, VERTDR, of the same frequency. The /VFBST signal initially is sent to a Frequency to Voltage converter to provide a program voltage to the oscillator. This presets the oscillator frequency so the oscillator then is able to lock to the incoming vertical sync signal.
Chapter 2—Functional Description The purpose for having an oscillator for the vertical sweep circuit is to maintain a sweep even in the event of loss of vertical sync signal to prevent damage to the CRT. The vertical oscillator has a free-run frequency of approximately 35Hz when there is no input. Horizontal Phase Locked Loop The incoming signal, /HSYNCR initially is sent through a Frequency to Voltage converter.
Chapter 2—Functional Descriptions The first is an input derived from the F to V in the horizontal PLL circuit. This presets the output of the supply to a voltage that will provide a nominal raster size for the horizontal frequency applied. The second input is provided by the SCB via the serial interface. This input allows control of the raster width by the operator. To control the raster width, the operator presses the SIZE button on the remote control.
Chapter 2—Functional Description The three (3) horizontal deflection coils (B, G, and R) are driven in parallel by a single drive circuit and transistor. This is the reason for the inability to remotely control the three (3) raster widths independently. Since the deflection coils are in parallel, it is imperative that they all be connected prior to applying sweep voltage—the interlock circuit ensures this. An output from the Horizontal Power Supply is sent, in series, through all three (3) yoke connectors.
Chapter 2—Functional Descriptions Bus IIC I/O I Information Serial data load Serial Serial I I HPHASE HLINR Serial I TBKEY Serial Serial Serial Serial I I I I HCENTBLU HCENTGRN HCENTRED WIDTH Description Command to the serial data receiver that the incoming data is to be read. Commanded horizontal phase of picture. Commanded amount of overall H linearity correction. Commanded amount of top and bottom Keystone Correction. Commanded horizontal position of blue raster.
Chapter 2—Functional Description IICDATA IIC data line. Bi-directional serial line for synchronous data transfer between SCB and other circuit boards. See detailed description for list of signals transferred and data direction.
Chapter 2—Functional Descriptions System Power Supply Inputs +48V +15V -15V +5V GND Description Power for horizontal deflection Power for the analog section of the HDB Power for the analog section of the HDB Power for the digital devices on the HDB Return for HDB Interlocks and Protection Input None Output HSENSRED - Used to shut down the CRT beams in the event of horizontal sweep failure. HSENSGRN - Identical to HSENSERED. HSENSBLU - Identical to HSENSERED.
Chapter 2—Functional Description Vertical raster centering. Top and bottom pincushion correction. Top and bottom keystone adjustment. Horizontal overall and edge linearity adjustment. Left and right pincushion and keystone correction waveform generation. Sweep reversal for normal and inverted operation. Generation of wave forms used for dynamic focus.
Chapter 2—Functional Descriptions Figure 2-13 Vertical Deflection Board Vertical Preamps The vertical preamps (B, G, and R) each generate a ramp signal with the frequency determined by the incoming signal VERTDR from the Horizontal Deflection Board.
Chapter 2—Functional Description Vertical Amplifiers The Vertical Amplifiers take the ramp signals generated by the Vertical Preamps and provide further modification prior to driving the vertical deflection coils. Individual centering signals, set by the operator and controlled by the SCB are inserted in the Vertical Output Amps to provide offset for each vertical sweep.
Chapter 2—Functional Descriptions A form of the vertical frequency parabolic waveform that is derived from the red ramp is also sent out to the VPB as VPARAB for use in the dynamic focus circuit. Horizontal Linearity Correction The Horizontal Linearity Correction section provides correction for both horizontal overall linearity, and horizontal edge linearity. The WIDTH signal from the HDB and the /PCST signal from the RTG are combined to form a periodic ramp signal with horizontal frequency.
Chapter 2—Functional Description Correction Amplifiers There are six (6) correction amplifiers. Each one receives a real-time convergence correction signal: RXCORR. RYCORR. GXCORR. GYCORR. BXCORR. BYCORR, from the SCB convergence section. The X-correction amplifiers, R, G, and B, also receive the horizontal linearity signal. The horizontal linearity signal is then combined with the appropriate color's X-correction signal to produce a composite horizontal correction signal.
Chapter 2—Functional Descriptions Table 2-8 VDB Serial Bus Information Bus I/O Information Description IIC Front/Rear convergence TTL level that indicates whether the XO indication convergence is in front screen mode (high) or rear screen (pulled low). IIC Serial data load Command to the serial data receiver that the I incoming data is to be read. Serial I VH Commanded vertical height of picture. Serial I VCENTBLU Commanded vertical position of blue raster.
Chapter 2—Functional Description +SERDATA -SERDATA Serial data transfer. Unidirectional, differential, synchronous serial data communication line. Used for transferring data from SCB to other circuit boards. Uses SERCLK and IIC for control of receiver. Serial data transfer. System Controller Board Output /IICINT Description IIC interrupt line. Signal line for slave boards to inform the SCB (master) that there is data to be transferred. Master then polls slaves to determine the source of the interrupt.
Chapter 2—Functional Descriptions Outputs FLRCLING GEOCORR Outputs +RVERTYK -RVERTYK +GVERTYK -GVERTYK +BVERTYK -BVERTYK Description Low signal generated from jumper on connector J400 indicates noninverted operation. Output from L/R pincushion and keystone correction circuits. Main Vertical Deflection Coils Description Supply line to the main vertical deflection coil (red) after going through FLRCLING jumper plug. Return from main vertical deflection coil (red) after going through FLRCLING jumper plug.
Chapter 2—Functional Description Interlocks and Shutdowns Input HSENSRED - Used to shut down the CRT beams in the event of horizontal sweep failure. HSENSGRN - Identical to HSENSERED. HSENSBLU - Identical to HSENSERED. Output /SWEEPOK Indicates whether or not all sweeps are occurring at or above a minimum frequency. Used on the VPB to turn off the signal in the event of loss of sweep.
Chapter 2—Functional Descriptions Figure 2-14 Video Generation Block Diagram. This diagram provides an overall view of how the image is produced. Separate sections of this chapter detail the individual PCBs.
Chapter 2—Functional Description Video Processor Board P/N 104672 (VPB) The Video Processor Board (VPB) plugs into the electronics card cage. It is the rear-most card in the card cage. The VPB is the only card in the card cage that is held in by fasteners. There are four screws that tie the input tray to the rear panel of the card cage. The input tray is an aluminum panel that attaches to the VPB input BNC connectors.
Chapter 2—Functional Descriptions Figure 2-15 Video Processor Board, Block Diagram Decoder The optional decoder is a daughter board installed on the VPB. Since the VPB can only operate on an RGB/sync signal, use of the decoder is necessary in order for the projector to use a composite signal. The decoder takes a composite (NTSC, PAL, or SECAM) or S-Vid input and converts it into an RGB Sync signal for 2-44 Model 330.
Chapter 2—Functional Description further use in the Video Processor Board. The IIC bus is used by the decoder to select either Channel 3 (NTSC) or Channel 4 (S-Vid). The two (2) signals are multiplexed together on the decoder board for export to the Video/Sync Mux. Video/Sync Mux The Video/Sync Mux selects one (1) of three (3) external inputs (RGB1, RGB2, or Decoder) for use as the source for Image display and sync signals.
Chapter 2—Functional Descriptions Adding a DC offset to the output of the amplifier controls brightness. The brightness is controlled by the SCB via the IIC interface. The operator controls contrast level by pressing the BRIGHT button and using the up and down arrows on the remote control. All three (3) colors are controlled together. During the DC Restore interval when the BPCP pulse (measured at TP 10) is high, the output of this amp is set to the nominal DC level.
Chapter 2—Functional Description A defective video amp is detected by the state of the /RVIDOK, /GVIDOK, and /BVIDOK signals arriving from the VABs. A loss of +5V power to the VPB is detected by observing it internally to this circuit. When any one of the VIDOK signals goes high or a loss of +5V is detected, action will be taken to shut down all three (3) CRTs. Loss of +5V or defective VAB can potentially be more serious than loss of sweep.
Chapter 2—Functional Descriptions Video signal cutoff is accomplished by pulling blanking to zero. ILA® Bias ® ILA Assembly biasing is accomplished by generating a pseudo-square-wave with frequency set by the operator. The SCB sends the information on bias frequency via the IIC interface to the VPB. The operator can control the frequency over a range of from 1.5KHz to 3.0KHz. Selecting ILA BIAS FREQ from the ILA SETUP menu under the MAIN MENU controls the frequency.
Chapter 2—Functional Description IIC IIC IIC O O O VIDOK SWEEPOK BEAMDET Tells SCB that no VABs are reporting problems. Tells SCB that all sweeps are operating. Tells SCB that beam current limiting is occurring. BUS I/O Information Description Serial Serial Serial Serial Serial Serial Serial I I I I I I I REDBIAS GRNBIAS BLUBIAS RCONT GCONT BCONT BRIGHT Commanded amplitude of red LCLV bias. Commanded amplitude of green LCLV bias. Commanded amplitude of blue LCLV bias. Commanded red contrast.
Chapter 2—Functional Descriptions RTHRESH GTHRESH BTHRESH +SERCLK -SERCLK +SERDATA -SERDATA Outputs /IICINT I/O IICDATA Inputs VIDBLANK DCRSTR Outputs SGSYNC HSYNC VSYNC 2-50 Threshold (Z-axis offset) correction information for red. Real time data at 0V to 1V. Similar to RTHRESH. Similar to RTHRESH. Serial data transfer clock (+). Unidirectional, differential clock line from SCB to other circuit boards. Used for synchronous control of serial communication over SERDATA data lines.
Chapter 2—Functional Description Inputs VPARAB HPARAB /SWEEPOK Inputs RBEAM GBEAM BBEAM /RVIDOK /GVIDOK /BVIDOK Outputs BLANKING /BENABLE /RENABLE /GENABLE RVOUT GVOUT BVOUT CLAMP Vertical Deflection Board Description A periodic, positive-going, parabolic waveform with the vertical scan frequency, used for dynamic focus. A periodic, positive-going, waveform with the horizontal scan frequency, used for dynamic focus.
Chapter 2—Functional Descriptions BVIDCH1 BVIDCH2 HSYNCCH1 HSYNCCH2 VSYNCCH1 VSYNCCH2 COMPVID LUM CHROM RTN Outputs +RLCLV -RLCLV +GLCLV -GLCLV +BLCLV -BLCLV Blue video input to channel 1. Blue video input signal to channel 2. Horizontal or composite sync signal to channel 1. Horizontal or composite sync signal to channel 2. Vertical sync signal to channel 1. Vertical sync signal to channel 2. Composite video signal, pass through to decoder. Luminance signal for SVHS, pass through to decoder.
Chapter 2—Functional Description Outputs VDFOCUS HDFOCUS /HVEN Inputs +5V GND +15V -15V GND (TP 0) High Voltage Power Supply Description Parabolic waveform of vertical frequency. Parabolic waveform of horizontal frequency modulated by the VDFOCUS waveform. Enable signal for HVPS, used to shut down HVPS for CRT protection. System Power Supply Description Power supply to digital components. Return from digital components. Power supply to analog components. Power supply to analog components.
Chapter 2—Functional Descriptions high resulting in shutdown of grid bias at the Video Amplifier Boards. Also, the SWEEPOK status bit will be transmitted as a low to the SCB. /GVIDOK Similar to /RVIDOK. /BVIDOK Similar to /RVIDOK. Output /HVEN When either /RVIDOK, /GVIDOK, or /BVIDOK from the Video Amplifier Boards is pulled high, or the +5V power on the Video Processor Board goes low, /HVEN is pulled high. This results in the HVPS being disabled, thus shutting down high voltage to the CRTs.
Chapter 2—Functional Description Circuit failure detection. Beam current sense. Arc protection. This section uses Figure 2-16 for reference. The description provides information to perform module-level troubleshooting. Figure 2-16 Video Amplifier Board, Block Diagram Video Signal The video signal comes directly from the VPB backplane connector via a coaxial cable to the Video Amplifier Board and enters as VIN. The input signal will be a maximum of 1Vpp.
Chapter 2—Functional Descriptions Beam Current Sense The cathode current is sensed at the output of the video amplifier, then filtered and amplified so that the output is a 1mV/1uA signal averaged over several horizontal lines (the number of lines depending on the horizontal frequency). This current sense signal is then sent to the VPB as the signal BEAM. DC Restore The DC Restore function is accomplished on the Video Amplifier Board when commanded by the CLAMP signal from the VPB.
Chapter 2—Functional Description General I/O This section provides a comprehensive description of the inputs to and outputs from the VAB. The I/O description are arranged by the source/destination of the signal and so the assemblies communicated with are used as the primary heading of each group of signals and then are further subdivided into inputs and outputs. In each case, the signal's direction is noted, with input referring to an input to the VAB, and output to an output from the VAB (e.g.
Chapter 2—Functional Descriptions Table 2-11 Video Amplifier Board I/O Signals Video Processor Board Input Description VIN COAX input from VPB via the backplane. Video signal of 1V peakto-peak maximum. /ENABLE TTL level DC signal which controls grid voltages. High causes G2 to be pulled to +15V and G1 to be pulled to -200V shutting off the CRT beam. CLAMP TTL level pulse controlling DC restore. Restores black level of cathode voltage to +84V. BLANKING TTL level signal controlling video blanking.
Chapter 2—Functional Description Inputs +107V +6.3V +15V -15V GND ARC GND System Power Supply Description Power supply to cathode drive amplifier. Power supply to filament. Power for analog components. Power for analog components. Return for power supplies. Low impedance return path to HVPS for arc currents. System Controller Board P/N 104668 (SCB) The system controller board plugs into the electronics card cage. It is the middle board in the card cage (third from the front).
Chapter 2—Functional Descriptions General Functional Description The system controller board receives external commands, interprets those commands, and issues internal commands to control the operation of the arc lamp, light valves, raster generation, video signal amplifiers, and other components necessary for projector operation. The SCB receives commands from the outside world via the IR or RS232 interface. Output communication is accomplished via the RS232, the dot matrix display, and the CRT display.
Chapter 2—Functional Description Figure 2-17 System Controller Board, Block Diagram CPU The central processor (CPU) is a Motorola MC68302 embedded controller and is the main controlling component of the projector. Operation of the CPU is controlled by the program instructions written in the Program Memory. The program memory consists of two (2) UV erasable EPROMs (U24 and U63) loaded with the appropriate software for the projector, mounted in sockets for ease of updating the software.
Chapter 2—Functional Descriptions As the CPU processes information, it is stored in the Working and Compressed Memory. This includes all temporary storage as well as the channel data that the operator sets while ‘tweeking up’ the projector. All communication, both input and output, for internal signals and operator interface, is directly controlled by the processor. On-screen messages are generated and written to the Overlay Memory which serves as a video memory for controlling the on-screen display.
Chapter 2—Functional Description The digital information that is to be used for raster correction is stored in bit-map form. The bit-map is 96 fields (out of 112) wide by the number of horizontal lines in a frame wide. Each address in the EXM corresponds to a small section of one (1) line on the screen. As the raster is scanned, the EXM is being read out so that during the time that each line of the raster is being scanned, 96 memory locations are being read.
Chapter 2—Functional Descriptions drives the correction amplifiers. The raw (compressed) data is stored in the WCM while the smooth (expanded) data is stored in the EXM. When a channel change occurs in the projector, the compressed correction data that is stored in the WCM is interpolated by the DSP into the expanded form that is stored in the Expanded Memory. The compressed data is stored in the WCM in a 33X33 matrix of values representing the desired correction over the whole screen.
Chapter 2—Functional Description each line in the raster. The starting address is timed by the /MAPST signal. When that comes along, it indicates the top of the raster is beginning so the address generator should begin counting at the beginning. Overlay Interface The Overlay Interface takes the raw data out of the Overlay Memory and sends formatted information to the VPB for generating the desired displays. Some of the data is simply buffered and sent along.
Chapter 2—Functional Descriptions There are three (3) ports for receiving IR radiation. One (1) is located on the front of the projector just above the Green projection lens and the other two (2) are located on the rear panel. One of the receivers on the rear panel is located next to the LED display and, like the front receiver, is used for directly receiving IR radiation.
Chapter 2—Functional Description Table 2-12 System Controller Board I/O Signals Video Processor Board I/O Description IICDATA Data line for transferring the following information (I = input, O = output). The input data are associated with an interrupt pulse.
Chapter 2—Functional Descriptions I/O IICDATA Input /IICINT /FRAMEST /MAPST /Hx112 /Hx224 /FIELD1 /CORRSTRT INTI /VSYNC Output 2-68 Raster Timing Generator Description Data line for transferring the following data (I = input, 0 = output). The input data are associated with an interrupt pulse.
Chapter 2—Functional Description SYSCLK IICCLK +SERCLK -SERCLK +SERDATA -SERDATA I/O IICDATA 4.05MHz clock signal Clock signal for the IIC data bus. Serial data transfer clock. Serial data transfer clock. Serial data transfer. Serial data transfer. Vertical Deflection Board Description Data line for transferring the following data (I = input, O = output), the input data are associated with an interrupt pulse.
Chapter 2—Functional Descriptions Horizontal Deflection Board I/O Description IICDATA Data line for transferring the following data (I = input, O = output). O Flyback Switch Select O Flyback Switch Pulse I Front/Rear indication I Floor/Ceiling Indication O Serial Data Load Input /IICINT Description Interrupt that tells the SCB that the HDB has data to report. -SERDATA Horizontal Deflection Board Description Clock signal for the IIC data bus. Serial data transfer clock. Serial data transfer clock.
Chapter 2—Functional Description /LEDBL1 /LEDBLO Brightness Brightness RS232 #1 RXD1 TXD1 /CTS1 /RTS1 DCD1 COMRTN RS232 #2 RXD2 TXD2 /CTS2 /RTS2 RS-232 Interface Signals Description Receive data Transmit data /Clear to send /Ready to send Carrier detect Return IR Interface Input /RIRIN /EXTIRIN EXTIRIN /FIRIN Description Input from rear IR Receiver Differential input from IR Receiver Differential input from IR Receiver Input from front IR Receiver Backplane Board p/n 100571 The Backplane is a PCB th
Chapter 2—Functional Descriptions Figure 2-18 Backplane Interface Block Diagram 2.7 Optical Section The Optical section consists of the CRT Assembly, the Arc Lamp Assembly, and the Optical subassemblies, which provides the image to be viewed on the screen. The Optical Section filters, splits and directs the high intensity light to the three (3) separate (RGB) light channels. Figure 2-19 shows the video path from the CRT to the screen and the optical path from the Arc Lamp to the screen.
Chapter 2—Functional Description light. The vertically polarized light then passes through the prism to the projector lens. The ILA® assembly combines the input signal from the CRT with the high intensity light from the arc lamp. Thus, the brightness of the screen image does not depend on the brightness of the CRT but on the light from the xenon arc lamp. (A more detailed explanation of the ILA® assembly is in Section 2.8 at the end of this chapter.
Chapter 2—Functional Descriptions CRT Image Combined Image and High Intensity Light=Bright Image Relay Lens CRT ILA Image and High intensity Arc lamp light are combined at the ILA and reflected back toward prism Focuses Image onto the ILA CRT Image Prism Projection Lens Screen Prism horizontally polarizes the light and directs it to the ILA.
Chapter 2—Functional Description Prism The prism receives the high intensity light from the xenon arc lamp and polarizes the light horizontally. The prism reflects virtually all of this light toward the ILA® assembly. This light is then phase modulated into a vertical plane by the input side of the ILA® assembly and then reflected back toward the same prism.
Chapter 2—Functional Descriptions Optical Subassemblies Cold Mirror The Cold Mirror lets most of the infrared light pass through and reflects the rest of the light toward the prism through an ultraviolet filter/condensing lens, dichroic mirrors and down-steering mirrors. The infrared light is absorbed in a series of fan-cooled screens.
Chapter 2—Functional Description horizontally polarized light is sent through the liquid crystal layer of the ILA® assembly, reflected by a dielectric mirror surface, and then sent back through the liquid crystal layer on the way out of the ILA® assembly. Figure 2-20 The Hughes-JVC Image Light Amplifier The polarized light is phase modulated, or rotated, up to 90º by the liquid crystal layer; 45º of rotation for the first pass through, and another 45º after being reflected by the internal mirror.
Chapter 2—Functional Descriptions Figure 2-21 Simplified illustration of the Series 300 Projector optical path The phase modulated light exiting the ILA® assembly re-enters the prism assembly that, in this direction, passes vertically polarized light to the projection lens and onto the screen. Horizontally polarized light re-entering the prism assembly is rejected. Light that is not fully horizontally or vertically polarized will pass through the prism assembly in varying degrees of brightness.
Chapter 3---Service Adjustments 3.0 Service Adjustments Contents 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Service (Cover-Off) Power-On Sequence ..................................................3-1 CRT Yoke Rotation....................................................................................3-3 Vertical Size Tracking................................................................................3-5 Vertical Linearity Tracking ........................................................................
Chapter 3---Service Adjustments with the remote. Then turn the projector power back off with the remote. This allows power to be reapplied to the fans to cool the arc lamp that remains very hot even after power is removed. During a normal power shutdown the fans continue to run for several minutes to cool the arc lamp. 3. Turn on the main circuit breaker (located on the bottom, right side of the main power supply inside the projector in (see Figure 3-1).
Chapter 3---Service Adjustments 1. Press the Power ON key to turn on the projector (press both power keys simultaneously if using the tethered remote). The Ignitor circuit will ignite the arc lamp and power will be applied to the electronics system. NOTE: If using a terminal or PC, turn full power on by typing CTRL-P. To power up the electronics only, type CTRL-E. To power up the lamp only, type CTRL-L. These are toggle commands; repeated issuance of the commands toggles these power sources on and off.
Chapter 3---Service Adjustments Figure 3-2 View of the CRT Assembly showing deflection yokes, width coils, CRTs and Video Amplifiers. 5. Remove the 2.5mm Allen screw holding the electronics module in place and tilt the electronics module (see CAUTION following) back to expose the CRT necks and yoke. CAUTION! Remove anything plugged into the rear electronics jacks or the plugs could be badly damaged when the electronics module is tilted back. 6.
Chapter 3---Service Adjustments 9. View B. 10. Rotate the blue CRT deflection yoke to achieve a level image at the center of the screen (it should be parallel to the green and red grid center lines). 11. Retighten the yoke clamp so it is secure. Be careful not to over-tighten it. 12. Tilt the electronics module back into place. 13. Replace the allen screw from Step 4 above. 14. Replace the rear cover. 15. After Yoke rotation, re-adjust Geometry, Convergence and CRT Mechanical focus. 3.
Chapter 3---Service Adjustments Blue Vertical Linearity Blue Vertical Size R 328 Red Vertical Linearity Green Vertical Linearity Green Vertical Size R R R R 411 311 211 36 R 228 Red Vertical Size R 428 R R R 96 139 171 CAUTION!!! Do not adjust the pots that are shaded! They are factory adjusted. Do not adjust the Green Vertical Size or Green Vertical Linearity unless the Green Yoke or Green CRT has been replaced. Figure 3-3 Vertical Size and Linearity Controls on the Vertical Deflection Board.
Chapter 3---Service Adjustments 3.5 Horizontal Size Tracking The horizontal width coils are factory adjusted and will not normally need adjustment. In general, if the R and B vertical lines are within two (2) crosshatch lines of each other, they can be brought in line with the Convergence procedure. If the R or B horizontal size does not match G within two crosshatch lines, adjust the Horizontal Width coils on the R and B Deflection Yokes (refer to Figure 3-1).
Chapter 3---Service Adjustments 8. After Yoke rotation, readjust Geometry, Convergence and CRT Mechanical focus. 3.6 ILA® Bias Settings The ILA® Bias settings are factory set and should not normally need adjustment unless specific maintenance has been performed that requires an ILA® Bias readjustment. Avoid readjusting the ILA® Bias settings unless absolutely necessary.
Chapter 3---Service Adjustments 1. Select ILA® Menu, from the Main Menu. 2. Select Frequency Adjust from the ILA® Bias Menu. 3. A frequency of 1.8 kHz is acceptable for general video viewing. A lower frequency (as low as 1.5 kHz) will provide a brighter image but with lower image burn-in. A higher frequency provides higher resolution. For HDTV a frequency of 2.0-2.5 kHz provides higher resolution. Use the up/down keys to adjust the ILA® frequency for the appropriate input source. As a general rule 1.
Chapter 3---Service Adjustments the mechanical CRT focus should not be adjusted. If the image is not sharp enough, proceed with the CRT mechanical focus adjustment below. There are three (3) adjustment rods for each CRT making a total of nine (9). The rods are accessed through holes, covered by hole caps, in the base and fan casing at the rear of the projector (see Figure3-3). The focus rods will be adjusted so that each CRT face is completely parallel to its respective ILA® assembly, (i.e.
Chapter 3---Service Adjustments Figure 3-5 On-Screen Focus Points. Adjust the focus rods for best focus at these points. Using Test Pattern 8, H-Grid, adjust the focus rods for the best mechanical focus as follows: 1. Connect a low-resolution source (approx 31.5 kHz x 60Hz) to the projector inputs so that the projector can sync on that source. 2. Increase Size to 100% horizontal and vertical. 3. Cutoff R and B and view G. Verify G highlighted on the screen. 4.
Chapter 3---Service Adjustments 9. Cutoff R and view B. 10. Repeat Steps 2-4 for Blue. 3.8 Electronic Focus The Electronic Focus adjustment is factory-set and should not need to be adjusted. Whenever a major component has been replaced, like a CRT, or if the high voltage power supply has been repaired the electronic focus will have to be readjusted. To do this, select Test Pattern 8, H-GRID, and observe the screen for a sharp focus at the center of the screen.
Chapter 3---Service Adjustments Figure 3-6 Electronic Focus and G2 Adjustments NOTE: The Electronic focus and G2 adjustments are located on the high voltage power supply on the rear-left side of the projector under the cover. 3.9 Jumper Settings Table 3-1 illustrates which jumpers are used on the Horizontal Deflection Board and the Vertical Deflection Board for different projector orientations. Table 3-1 Projection orientation jumper settings. Convergence jumpers Vert. Def. Board Vertical jumpers Vert.
Chapter 3---Service Adjustments indicates the proper location for front and rear projection. The HJT Series 300 Projector is shipped with the jumper plug inserted in J500 for front projection. For a rear projection setup, insert this jumper plug into J501. J5 01 REAR p ro jectio n J5 00 FRONT p ro jectio n Figure 3-7 Horizontal Scan Jumper and Jacks on Horizontal Deflection Board. The jumper is installed at the factory in J500 for front projection.
Chapter 3---Service Adjustments 4. Pull out the Horizontal Deflection board and verify that the horizontal scan jumper is properly inserted for front (J500) or rear (J501) projection, depending on your application (refer to Figure 3-6 and Table 3-1). Change jumper if necessary. 5. Replace the card cage cover. 6. Replace the rear projector cover. Inverted Vertical Jumpers The Vertical Invert jumpers invert the image vertically for use in some situations that use mirrors or ceiling projections.
Chapter 3---Service Adjustments 4. Pull out the Vertical Deflection Board and verify the vertical jumpers are inserted in the correct jacks, depending on your application (refer to Table 3-1 and Figure 3-7). Change jumpers if necessary. 5. Replace the card cage cover and rear projector cover. 3.10 G2 Adjustment NOTE: For convenience, HJT provides factory-preset channels. These channels are covered in Chapter 4 of the Operator's Manual. Adjusting G2 affects the image quality of these preset channels.
Chapter 3---Service Adjustments 8. Adjust Menu Position using the Grey Scale and the Timing Setup Menu. (Refer to the Menu Position section). To set G2: 1. Cut off R and B and view G. 2. Select the Pluge test pattern. 3. Adjust green G2 so that the small, black rectangle in the center of the larger, black rectangle is just barely visible (Figure 3-8). 4. Select the Dot Pattern test pattern and toggle the HIDE key. While toggling, verify there is no change in the background raster brightness.
Chapter 3---Service Adjustments 3.11 Arc Lamp Alignment and Focus The Arc Lamp must be realigned and refocused whenever the lamp is replaced or becomes defocused or misaligned from physical shock to the projector. Refocusing only may be required if the Arc Lamp has been in use for a long time. Adjustment procedures for Model 330 projectors differ from those for the Model 340SC and Model 370SC projectors and are each detailed in the following sections.
Chapter 3---Service Adjustments 4. When the hot spot is at the center of the screen, retighten the four (4) Arc Lamp holding screws. X and Y Adjustments Z axis set screw 3 of 4 Arc Lamp Holding Screws (bottom screw not shown) Z-Axis Adjustment Figure 3-10 Model 330 Arc Lamp Adjustments (the Heat Sink has been removed for photograph). To refocus the Model 330 Arc Lamp: 1. Loosen the Set Screw on the Arc Lamp shaft. 2.
Chapter 3---Service Adjustments Model 340SC and 370SC Arc Lamp Alignment and Focus To check Model 340SC and 370SC Arc Lamp alignment, observe the anode shadow on the blue dichroic mirror (the blue dichroic mirror is the first mirror after the condensing lens). Verify that the anode shadow (small, dark oval inside the light circle) is a uniform oval that is no more than ½ inch or no less than ¼ inch in diameter.
Chapter 3---Service Adjustments Figure 3-9. Model 340SC and 370SC Arc Lamp Adjustments 3. Verify that the condensing (collimating) lens assembly has not moved (see Figure 4-1 or 4-2 and Photo 4-4). Check to see if the assembly is loose. It should be unmovable in any direction. 4. The barrel of the lens assembly should be no more than 1½ inches (usually much closer) from the blue dichroic mirror.
Chapter 3---Service Adjustments 2. Measure the number of millivolts between pins 3 and 4 on SPS J505. NOTE: This circuit is designed so that the number of millivolts between these pins (for Models 340 and 370, it is millivolts divided by 10) represents the lamp current in amps. 3. Multiply the two (2) figures from Item 1 and from Item 2 together. 4. Divide the product from Step 3 by 1 for Model 330 wattage. Divide the product from Step 3 by 10 to get wattage for Model 340SC or 370SC. 5.
Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-23
Chapter 4—Maintenance 4.0 Maintenance Remove/Replace) Contents 4.1 Maintenance Remove/Replace) ....................................................................4-1 4.2 Projector Covers.........................................................................................4-5 4.3 Ventilation Filters.......................................................................................4-5 4.4 Arc Lamp Assembly...................................................................................
Chapter 4—Maintenance Wait at least a minute after turning off power and removing the power plug for the high voltage to bleed off. ➨ Observe all cautions and warnings printed on labels. ➨ Observe proper electrostatic discharge procedures. ➨ The major removal and replacement sections are as follows: Projector Covers. Ventilation Filters. Ignitor Assembly. Arc Lamp Assembly. System Power Supply. Electronics Module. Cathode Ray Tube. Video Amplifier Board. CRT Yoke. High Voltage Power Supply.
Chapter 4—Maintenance Figure 4-1 Major components of the Model 330 Projector.
Chapter 4—Maintenance Figure 4-2 Major components of the Model 340SC and 370SC Projectors. 4-4 Model 330.
Chapter 4—Maintenance 4.2 Projector Covers To remove the two-piece projector cover: CAUTION! When removing the projector covers do not bump any internal components of the projector. If any undue resistance is felt, pause to locate the source of resistance before proceeding with cover removal.
Chapter 4—Maintenance NOTE: This filter can also be removed, while leaving the rear cover in place, by removing the two screws at the top of the side panel where the filter is located. Slide the panel up and out. 4.4 Arc Lamp Assembly The Arc Lamp Assembly, which includes the Ignitor, is located in the middle section of the projector. Separate instructions for both the Model 330 and the Model 340SC and 370SC arc lamp assembly removal follow.
Chapter 4—Maintenance J503 and J504. Ignitor Assembly. Figure 4-3 Model 330 Arc Lamp and Ignitor Assembly (P/N 900611S), shown without Heat Sink attached) 5. Remove the three (3) Hex-head screws that attach the Ignitor Assembly to the Arc Lamp rails. 6. Put on protective clothing, including safety goggles and face shield. 7. Slide the Arc Lamp and Ignitor Assembly out, being careful to clear the plastic cover on the top of the System Power Supply (where two (2) of the Arc Lamp cables are attached). 8.
Chapter 4—Maintenance Table 4-1 Ignitor Connections for Model 330 Projector Ignitor Terminal POS INPUT NEG INPUT NEG INPUT POS OUTPUT Location on Ignitor Right Side of Ignition Coil Negative Terminal Lug mounted on circuit board Negative Terminal Lug mounted on circuit board Left Side of Ignition Coil Wire Color Red Black (on J503 side) Black White Wire goes to: J504 (+) terminal on System Power Supply. J503 (-) terminal on System Power Supply. Terminal on rear of Arc Lamp.
Chapter 4—Maintenance 10. Remove the two (2) ground straps (not shown in Photo 4-2 or Photo 4-3) from the top, right side of the Arc Lamp assembly housing. Leave these straps attached to the Collimating Lens housing. 11. Remove the two (2) hex bolts on the left and right side of the Arc Lamp assembly that attach the Arc Lamp assembly to the mounting rails (lower front of the Arc Lamp assembly). When removing the hex bolts, also remove the ground straps and leave them attached to the Relay Lens bracket.
Chapter 4—Maintenance their correct terminals in accordance with the way they were labeled above. Be sure that the connections are tightened securely. NOTE: Whenever an Arc Lamp is replaced the Collimating Lens may need to be readjusted to obtain maximum brightness. Follow the Collimating Lens Adjustment procedure in Section 4.4.3 to accomplish this. NOTE: The Arc Lamp current must also be reset when an Arc Lamp is replaced.
Chapter 4—Maintenance Example: If the center brightness is 20 foot-candles, the ideal edge brightness should be 10 foot-candles. CAUTION! Do not allow roll-off to be greater than 4:1 or damage to the Cold Mirror could result. Refer to Section 3.11 information on how to check roll-off. 3. In some cases it may also be necessary to adjust the vertical and horizontal orientation of the collimating lens to achieve maximum brightness.
Chapter 4—Maintenance AC Power Terminal Block Ground Main AC Circuit Breaker Mounting screws (under lip) Figure 4-7 System Power Supply (right side of projector) 7. Remove the grounding cable from the right side of the power supply (see Figure 4-7). 8. Loosen and release the two (2) captive screws at the base of the power supply, located on the right side below the AC terminal block (under the mounting bracket–Figure 4-7). 9.
Chapter 4—Maintenance Wire Bundle Clamp ARC LAMP ASSEMBLY SYSTEM POWER SUPPLY } J501 J500 J502 SYSTEM POWER SUPPLY CONNECTORS CARD CAGE BACKPLANE TIE WRAP ANODE LEADS CAPTIVE SCREWS HIGH VOLTAGE POWER SUPPLY Figure 4-8 System and HV Power Supply (left side of projector) 4.6 Electronics Module The Electronics Module is the entire assembly to the rear of the Arc Lamp and optics assemblies. The Electronics Module consists of the system power supply, card cage, and CRT housing assembly.
Chapter 4—Maintenance 4. At the rear of the projector, remove the three (3) filter housing screws (located under the rear lip of the projector base-plate) and remove the filter housing. 5. On the left side of the projector, unplug connectors P82 and P83 from the backplane and move the wiring harness out of the way. 6. Back all CRTs into the CRT assembly (focus rod screws, at the rear of the CRT assembly, to the stops—refer to Photo 4-6. 7.
Chapter 4—Maintenance 4.7 Cathode Ray Tube (CRT) Three (3) cathode ray tubes are located in the CRT assembly below the card cage and system power supply. The following procedure is used to remove any CRT: WARNING!!! Handle a CRT with extreme caution. If dropped they can implode and flying glass can cause severe injury to personnel. Never bump or drop the tube. Use extreme care when removing and replacing CRTs. Dispose of the tube immediately.
Chapter 4—Maintenance module. This is not absolutely necessary and it is up to the technician’s discretion whether or not to remove it (Section 4.5). 3. After removing the System Power Supply, remove the system power supply mounting plate that covers the top front area of the CRT Assembly. 4. Run the CRT all the way forward using the Z axis focus rod at the rear of the CRT assembly (Photo 4-6). 5. Remove the video amplifier board from the CRT Assembly (Section 4.8). 6.
Chapter 4—Maintenance Figure 4-10 Model 340SC and 370SC CRT Assembly Figure 4-11 CRT Z-Axis Focus Adjustment Rods (circled).
Chapter 4—Maintenance Model 340SC and 370SC CRT Removal To remove a Model 340SC and 370SC CRT (see Figure 4-10): 1. Unplug the projector. Wait at least one (1) minute before proceeding for the high voltage to bleed off. 2. Remove the electronics module (Section 4.6). NOTE: Removal and replacement of a CRT may be more easily accomplished with the System Power Supply removed from the electronics module. This is not absolutely necessary.
Chapter 4—Maintenance 3. Ensure that all control cables are disconnected from the back of the cardcage then tilt the card cage back to expose the inside of the CRT housing. 4. Unplug and label the five cables connected to the VAB. 5. Unplug and remove the VAB from the back of the CRT. CAUTION! The connector pins on the CRTs are easily damaged. If damaged, the CRT must be replaced and will not be covered by warranty.
Chapter 4—Maintenance 7. Perform a CRT mechanical focus adjustment (Section 3.7) and yoke alignment (Section 3.2) after yoke replacement. 4.10 High Voltage Power Supply (HVPS) The HVPS is located on the left side of the projector next to the CRT housing assembly. To remove the HVPS: 1. Unplug the projector. Wait at least a minute before proceeding for the high voltage to bleed off. 2. Run all three (3) CRTs all the way forward using the Z axis focus rods at the rear of the CRT assembly (Photo 4-6). 3.
Chapter 4—Maintenance 4.11 Card Cage (Printed Circuit Boards) The card cage is located at the rear of the projector above the CRT housing. CAUTION! Printed circuit boards in the electronics module are susceptible to electrostatic damage. While servicing the projector be sure to observe electrostatic discharge precautions. Always wear a conductive wrist strap and ground lead when handling PCBs. To remove a PCB: 1. Turn the projector power off at the remote.
Chapter 4—Maintenance To ensure a proper connection between J11 and P11 follow the procedure below: Before installing the Horizontal Deflection Board, remove the Vertical Deflection Board. This allows for a full inspection of the proper connection of J11 and P11. The P11 connector on the backplane is slightly loose to allow movement for minor dimensional differences in the position of the J11 connector on the HDB. Do not tighten connector P11 on the backplane. 4.
Chapter 4—Maintenance 4.13 Projection Lens Projection lenses are located at the front of the projector and are held in place by friction clamps called Lens Locking Rods. Lens Locking Rods Figure 4-12 Projection Lens Locking Rods To remove a projection lens (see Figure 4-12): 1. Turn off the projector. 2. Using a slot screwdriver, loosen the lens locking rod and turn the clamp at the top of the lens (first, see WARNING below) until the flat part of the clamp is facing down.
Chapter 4—Maintenance Table 4-2 for reference to part numbers, if necessary. 4-24 Model 330.
Chapter 4—Maintenance Table 4-2 Lens Replacement Lens Throw Lens Part Number or Designation Ratio Red Green Blue 1.5:1 101241 101241 101715 3:1 900609-3 900609-2 900609-1 5:1 101239 101239 101239 101240 101240 101240 7:1 NOTE: More details on lens options, converters and other lens information can be found in the appropriate model Operator's Manual. 4.
Chapter 4—Maintenance Figure 4-13 System Controller Board SRAM Chips Location. CAUTION! Never place the socket battery on a metal surface! The positive and negative terminals of the battery will short out and destroy the battery! 3. The four (4) socket batteries are located in the chip inserts beneath the SRAM chips, U25, U26, U64, and U65 (refer to Figure 4-6 for location).
Chapter 4—Maintenance 4.15 Recommended Spares It may be advisable to maintain a supply of spares to maximize performance. This is particularly important if projectors are being operated on a continuous basis or when multiple projectors are used. Table 4-3 provides a list of recommended spares for one (1) to four (4) Series 300 model projectors.
Chapter 5---Troubleshooting 5.0 Troubleshooting Contents 5.1 5.2 5.3 5.4 General Information ....................................................................................5-1 Troubleshooting ..........................................................................................5-3 Break Points ................................................................................................5-5 Main Menu Structure ..................................................................................
Chapter 5---Troubleshooting Table 5-1 Error Codes for the Model 330, 340SC and 370SC Projectors LED On-Screen Text Description Codes shown along with operator messages. A RAM BATTERY Memory problem—data may be lost if b IS LOW power-off. COLOR IS Adjustment being attempted on cut-off gun. c CUTOFF DSP INIT FAILURE Convergence logic is dead at power-on. d LAMP TO-ON, Arc lamp did not light. l BUT OFF LAMP TO -OFF, Problem detecting arc lamp state. m BUT ON POWER TO-ON, Power supply problem.
Chapter 5---Troubleshooting LED x On-Screen Text Problem with decoder module data. y Problem with decode input. # Loss of horizontal sweep detected. Description Codes indicating a software bug—system should keep running. Internal error code not recognized. G H Incoming command not recognized. J Internal password control code bad. K DAC reference not recognized. L Timer table reference not valid. M IIC reference not recognized. N RTG reference not recognized.
Chapter 5---Troubleshooting STB +5volts or +24volts are still not present after verifying that the circuit breaker is on and the projector is plugged in, the System Power Supply may be defective. NOTE: Only the +5 volts LED is lit on the Backplane Status Indicator panel (see Figure 2-2) when A/C power is applied. When the projector is directed to Power-On the +24volts standby LED should light and fans should be running. 2.
Chapter 5---Troubleshooting 5.3 Break Points Break Points (or Trap Processing) handle internal interrupts generated by the processor, such as: bus errors, illegal instruction, and divide by zero commands. Perform the following steps to setup for break codes (trap processing): 1. Access MAIN MENU and select #4 (DIAGNOSTICS MENU). 2. Select #7—this is an invisible menu item. 3. Press ENTER to clear the displayed break (trap) data.
Chapter 5---Troubleshooting Resetting the Projector The projector’s processor must be reset if a break (trap) condition occurs. The processor can be reset by either of the following methods: 1. Cycle main power off, then back on (allow ten minutes for Arc Lamp to cool). 2. Press the reset button (labeled S1) located at the top center of the SCB. Break (Trap) Data from the Diagnostics Menu After resetting the projector, retrieve the break (trap) data from the diagnostics menu by performing these steps: 1.
Chapter 5---Troubleshooting 5.4 Main Menu Structure MAIN MENU 1. 2. 3. 4. 5. 6. 7. . CHANNEL MENU 1. CHANNEL LIST 2. AUTOSELECT LIST 3. COPY CHANNEL 4. UPDATE DEFAULTS 5. IMPORT CHANNEL 6. EXPORT CHANNEL > 7. COPY PARAMETERS > 8. DECODER SETUP(option) . . STATUS MENU 1. CH 1.... 2. HORZ RATE 3. FRAME RATE 4. INTERLACE 5. SYNC.... 6. PROJ ADD 7 SHOW ADD 8. SHOW ERR 9. CPU SW... 10. DSP SW... CHANNEL MENU > STATUS MENU ILA MENU > DIAGNOSTIC MENU > TIMING MENU > VIDEO QUICKSET > GRAPHIC ENHANCE > . . .
Chapter 5---Troubleshooting Table 5-5 Troubleshooting Guide Problem and Possible Solution Symptom to Check Service Manual Operator Manual No Power Main input power. System Power Supply main circuit breaker. System Power Supply circuit breaker fails when reset? Power Interlock Switch. Projector cover not enabling interlock switch. System Power Supply shuts down during power up sequence. Reset circuit breaker. 3-1 3.1, Reset System Power Supply circuit breaker.
Chapter 5---Troubleshooting Problem and Symptom to Check LEDs 200, 300, or 400 on the vertical deflection are unlit. LEDs 200 and 201, or 300 and 301, or 400 and 401 on the vertical deflection are unlit. Increasing G2 voltages decreases brightness level for all CRTs. Possible Solution Service Manual Replace Vertical Deflection Board. 4.11 Replace Horizontal Deflection Board if any two (2) are unlit. 4.11 Faulty High Voltage Power Supply under full load. Replace High Voltage power Supply. 4.
Chapter 5---Troubleshooting Problem and Symptom to Check Possible Solution Service Manual Operator Manual Image out of focus Spacer balls not visible. ILA® Spacer balls visible but image fuzzy. CRT focus range is limited and image is fuzzy. CRT focus not effective. CRT focus not effective. CRT focus limited due to focus rod range. Image blurry with shadow on right edge. Characters do not appear legible. CRT focus problem limited to single color. G2 mis-adjusted. Sensitivity offset set too high.
Chapter 5---Troubleshooting Problem and Symptom to Check Video has shadow on left or right edge. Video image not squared. Video image bowed at left/right edge or top/bottom. Picture horizontal linearity. Possible Solution Service Manual Operator Manual Correct using MENU POSITION and PINCUSHION POSITION. Correct using PINCUSHION POSITION and KEYSTONE. Correct using PINCUSHION left/right arrow. Correct using LINEARITY and EDGE LINEARITY.
Chapter 5---Troubleshooting Problem and Symptom to Check Bright Red, Green or Blue area on screen limited to corners or edge. Gray scale green in bright levels. Gray scale red in bright levels. Gray scale blue in bright levels. Possible Solution Adjust ILA® Assembly Bias and SHADING. Service Manual 3.6 Subtract Green SENSITIVITY offset, add Red and Blue. Subtract Red SENSITIVITY offset, add Green and Blue. Subtract Blue SENSITIVITY offset, add Green and Red. Operator Manual 4.10 4.10, 4.
Chapter 5---Troubleshooting Problem and Symptom to Check Data lost when projector is turned off and back on. “Flagwaving” at top of picture or top of image is skewed. Convergence and/or shading is incorrect after doing copy channel. Red bands across image after channel change. Communication error. Possible Solution Service Manual SCB socket batteries weak. “RAM BATTERY LOW” may appear on screen. 4.14 VCR mode (if using CVID or SVID input). Select 2H Sync Enable or Shift Sync Enable from the Menu.
Chapter 5---Troubleshooting Problem and Symptom to Check Intermittent operation. Sticking keys on the remote control. Possible Solution Service Manual Operator Manual Replace I/R remote battery or move closer to projector. If not possible to move closer to projector, use an I/R repeater for distances of 50’ or more. Stay in “line of sight”. Return remote control for replacement.
Glossary Glossary of Terms Adjust Flat Fld Flat field test pattern used for shading purposes, (adjusts in 7º increments). Amorphous Without definite form; not crystallized. Arc Lamp The xenon arc lamp in the Series 300 series projectors. Produces dangerously intensive light with hazardous levels of ultraviolet and infrared radiation. It operates at high temperatures (180ºC, maximum 300º C, or over 500º F). Aspect Ratio The ratio of the picture width to picture height. The standard U.S.
Glossary 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. Composite Video Means of transmission sending the complete video signal consisting of chrominance, luminance and the sync signals. It is the NTSC standard. Contrast The ratio between the dark and light areas of a television picture, setting white at 100%.
Glossary Gray Scale Test pattern of black-to-white gradation bars. The more levels of gray scale that can be handled, the more realistic an image can be displayed, especially a photograph that has been scanned into the computer. HDTV (High Definition Television) Has approximately twice the horizontal and vertical emitted resolution of standard NTSC. HDTV systems are wide aspect ratio systems. Hertz (Hz) The standard unit of frequency. One Hz is equal to one cycle per second.
Glossary Intensity Concentration of information or what would be seen if a black and white version of the image is displayed. 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 Executive Remote Used to control the Series 300 Projector during presentations. Limited use compared to the technician remotes; cannot permanently change any projector setup values.
Glossary Lumen A unit of measure of the flow, or rate of emission, of light. An ordinary wax candle generates 13 lumens while a 100 watt bulb generates 1,200 lumens. Luminance Abbreviated as "Y." The portion of the signal that contains the black and white information, which affects brightness. Monochrome Single color and refers to monitors that display only one color along with back, such as white on black, black on white, green on black and amber on black.
Glossary Phase adjustment Positions the input image (test pattern, video, graphics, etc.) on the CRT raster. If the phase is misadjusted, the image may "wrap around" the edges or be positioned off the screen. Pincushion Adjustment Corrects for warped distortion at the sides or top and bottom of the image. The pincushion adjustment is performed on green only and affects all RGB. Raster The area illuminated by the scan lines on a CRT.
Glossary 2) A display misadjustment that results in unnaturally bright colors. Scan To scan is to move across a picture frame a line at a time, either to detect the image, as in an analog or digital camera, or to refresh a CRT-based video screen. Scan Line One of many horizontal lines in a graphics frame. Scan Rate The frequency of line scanning for a monitor or projector. SECAM "Sequential couleur a memoire" (sequential color with memory).
Glossary temporarily with the Executive I/R remote. Vertical Resolution The amount of detail that can be perceived in the vertical direction; the maximum number of alternating white and black horizontal lines that can be counted from the top of the picture to the bottom. Vertical Scan Frequency The vertical scan frequency of the input signal. (V-Freq) Vertical Synchronization Frequency The number of times per second a frame is transmitted to a video display screen. Xenon Arc Lamp See Arc Lamp.
Glossary Model 330, 340SC, and 370SC Service Manual
