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JVC 330 Service Manual

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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
DECLARATION OF CONFORMITY
PER ISO/IEC GUIDE 22 AND EN 45014
760-929-5410
F
AX
- service@hjt.com
e

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Summary of Contents for JVC 330

  • Page 1: Service Manual

    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 DECLARATION OF CONFORMITY PER ISO/IEC GUIDE 22 AND EN 45014 760-929-5410 - service@hjt.com...
  • Page 2 Manufacturer: Hughes-JVC declares that this product conforms to the following Product Specifications (Directive/Standard): Safety: EN 60950 EMC: In addition, the above product complies with the requirements of the Low Voltage Directive 73/23 EEC and the EMC Directive 89/336/EEC. 105662 First Edition...

  • Page 3: Safety Information

    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.
  • Page 4 The HJT projector and shipping container have a combined weight of either 512 (Model 330 and 340SC) or 550 (Model 370SC) pounds. The HJT shipping container weighs 170 pounds and the projector itself weighs either 342 (Model 330 and 340SC) or 380 (Model 370SC) pounds.

  • Page 5: Heat Safeguards

    Due to voids in the prism fluid there is a dead zone of 19 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...
  • Page 6 When replacement is required, the arc lamp must be replaced as an entire module as outlined in the Hughes-JVC Model 330, 340SC and 370SC Projector Service Manual. No attempt should ever be made to replace the arc lamp inside its module! The arc lamp produces dangerous intense light with hazardous levels of ultraviolet and infrared radiation.

  • Page 7: Power Supply

    Fluid Safeguards Certain components of the projector contain fluid. If any fluid from the projector contacts the skin, wash off with soap and water. If any fluid from the projector splashes into the eyes, rinse with cool running water. Ventilation and Foreign Object Retrieval Ensure the projector’s multiple fans are free from obstructions and operating properly.
  • Page 8 Ensure that the projector AC power plug is removed from the AC outlet prior to attempting any of these procedures. Various procedures in this manual involve the removal Model 330, 340SC, and 370SC Service Manual...
  • Page 9 Safety Model 330, 340SC, and 370SC Service Manual...

  • Page 10: Acronyms Used In Manual

    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. This manual provides more detailed information on troubleshooting and maintaining the projectors and a more in-depth functional description of the system subassemblies than the specific Operator’s Manual, which cover the specific projector system description,...
  • Page 11 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. Prior to performing any procedures, adjustments or maintenance review the chapter on Safety Information at the front of this manual.
  • Page 12 220V AC, 20A, 60Hz 2,700 Watts power 1,500 W Xenon arc lamp Same 5.2.1 software graphics enhancement 30 memories decoder board option Model 330, 340SC and 370SC Service Manual 340SC 103774 103774 104668 104668 340SC Model 4,200 lumens 6,800 lumens...

  • Page 13: Table Of Contents

    Emphasis is placed on a description of system components to the functional block level. A number of block diagrams are provided for user reference. Figure 2-1 provides a block diagram overview of the HJT Model 330, 340SC and 370SC projectors. For simplicity, each major electronics assembly is shown with signal paths between appropriate functional units.

  • Page 14: Cover And Base

    In addition to aesthetics, the covers on the Model 330, 340SC and 370SC projectors serve several functions. The covers are an integral part of the cooling system of the projector. Air intake filters are contained in the covers as are cooling fans.

  • Page 15: External Power Requirements

    The projectors require 208V to 240V, 50 Hz to 60 Hz, single-phase AC power. The units are equipped with an attached AC power cord and 3-prong twist lock plug (Model 330 and 340SC use Hubble Model 2323; Model 370SC uses Hubble Model 2623 or equivalent).
  • Page 16 In addition, the projector provides the ability to control the relative brightness anywhere on the screen. The capabilities of the Model 330, 340SC and 370SC projectors are provided by a sophisticated electronics system, which consists of power supplies, input/output devices, and various circuit boards, and using both analog and digital components to provide functionality with a simple user interface.

  • Page 17: System Power

    The System Power Supply provides the connection between the external power source and the projector. The System Power Supply provides all internal DC power to the projector with the exception of that provided by the High Voltage Power Supply (Section 2.4.3). This includes the low voltage power to the electronics, the supply power to the HVPS, and the Arc Lamp power.
  • Page 18 When the rear cover is removed, the switch will be released and cause power to the projector to be interrupted. To run the unit without the cover installed, override the interlock switch by pulling it up into the 'service' position. When the cover is replaced, the switch will automatically be reset into the 'armed' position.
  • Page 19 Controller J502 /LVPSNBL /ALENBL Model 330. Model 340SC = +25V/80a; Model 370SC = +30V/100a. Figure 2-3 System Power Supply Block Diagram. Normal system power-up (Electronics and Lamp): 1. Upon receipt of Power-On command, SCB pulls /FANENBL and /ALENBL lines low.
  • Page 20 Table 2-1 System Power Supply Voltage Distribution Voltage CRT SCB +5v Stb +6.3v +15v -15v +24v +24v Stb +48v +107v +170v 2–8 Model 330, 340SC, and 370SC Service Manual Lamp/ Ignitor...

  • Page 21: Arc Lamp Ignitor

    The Arc Lamp Ignitor is mounted under or next to the Arc Lamp. It provides the high voltage pulse necessary to ignite the Xenon Arc Lamp that is the illumination supply for the HJT Model 330, 340SC and 370SC projectors. The System Power Supply’s Arc Lamp Supply section provides the necessary voltage to activate the ignitor and to sustain the arc in the Arc Lamp once it has been ignited.
  • Page 22 Arc Lamp and voltage drops to +22-30V (depending on projector model). 6. /LAMPLIT signal goes to SCB to inform board that Arc Lamp is lit. 2-10 CPU TIME-OUT 5-10 MINUTES LAMP-OFF COMMAND Model 330, 340SC, and 370SC Service Manual FAN DISABLE...
  • Page 23 HVPS is turned off. 3. Further details regarding this logic can be found in the functional description on the Video Processor Board in Section 2.6.4. Model 330, 340SC and 370SC Service Model Chapter 2—Functional Descriptions 2-11...

  • Page 24: High Voltage Power Supply

    2-12 Anode Grid 1 Grid 2 Focus High Voltage Power Supply (Pins 1,4,5,10 not used) Model 330, 340SC, and 370SC Service Manual RED ANODE GREEN ANODE BLUE ANODE RED FOCUS GREEN FOCUS BLUE FOCUS RED G2 GREEN G2 BLUE G2...
  • Page 25 Amplifier Board. This voltage is not user controllable. The -200V is the only output voltage from the HVPS that goes to the backplane of the projector to be routed to the Video Amplifier, and uses the rear-most LED of the backplane LED bar for indication.

  • Page 26: Card Cage

    2.5 Card Cage The Card Cage provides support and protection for five (5) circuit boards, the Phase Locked Loop and the optional Decoder Board in the HJT Model 330, 340SC and 370SC projectors. The five-(5) circuit boards are, from rear to front, the VPB, RTG, SCB, VDB, and HDB.

  • Page 27: Circuit Boards

    2.6 Circuit Boards The Model 330, 340SC and 370SC projectors have a total of twelve (12) accessible circuit boards. Seven (7) boards are located within the card cage (Figure 2-9) and five (5) are located outside the card cage (Table 2-2).
  • Page 28 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. 2-16 Model 330, 340SC, and 370SC Service Manual...
  • Page 29 Chapter 2—Functional Description Figure 2-10 Raster Generation Block Diagram Model 330, 340SC and 370SC Service Manual 2-17...

  • Page 30: Raster Timing Generator Board (Rtg) P/N 100568

    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. 340SC, and 370SC Service Manual...
  • Page 31 The square wave does not affect normal operation of the projector but will cause a vertical bar to be generated on the screen when the projector is operating on the internal sync with the DC restore timing set to BP or TL. Sync Detector and Selector The Sync Detector and Selector take inputs from the Video Processor Board.
  • Page 32 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.
  • Page 33 The pincushion and linearity correction timing signal is a pulse signal called /PCST that is sent to the Vertical Deflection Board. The signal is generated using the same timing Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description 2-21...

  • Page 34: Serial Communication

    (Figure 5-1, Menu Structure). HANNEL Description Commanded sync selection priority (always fixed as described above). Commanded timing for vertical positioning of correction map. Commanded position of left blanking. Commanded position of right blanking. Model 330. 340SC, and 370SC Service Manual IMING ETUP...
  • Page 35 /Hx224 Square wave signal 224 X the horizontal frequency for overlay address generator clocking. (TP 23) Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description Commanded position of top blanking. Commanded position of bottom blanking.
  • Page 36 /HSYNCRE Selected HSYNC signal. (TP 14) Outputs Description /PCST Signal to time the start of T/B pincushion and linearity correction. (TP 31) 2-24 Description Video Processor Board Horizontal Deflection Board Vertical Deflection Board Model 330. 340SC, and 370SC Service Manual...

  • Page 37: Horizontal Deflection Board P/N 102523 (Hdb)

    Oscillator for vertical deflection. The block diagram (see Figure 2-12) description and the I/O description, in the section following, provide information to perform module level troubleshooting. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description System Power Supply 2-25...
  • Page 38 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. 2-26 Model 330. 340SC, and 370SC Service Manual...
  • Page 39 The output voltage of the horizontal power supply is controlled primarily by two (2) inputs. Model 330, 340SC and 370SC Service Manual 2-27...

  • Page 40: Geometric Correction

    @ 60-90kHz. Flyback switching is not manually controllable by the operator. Geometric Correction The HJT Model 330, 340SC and 370SC projectors provide the ability to obtain a rectangular raster when shooting off-axis in the vertical direction from the screen. This ability is provided by left/right keystone correction.
  • Page 41 This circuit senses the horizontal flyback voltage and frequency. By sensing both amplitude and frequency, the projector is able to maintain sweep over the widely varying input conditions allowed and still protect the CRTs from damage. The flyback signal is AC coupled and peak detected, then compared with a reference.
  • Page 42 Commanded amount of top and bottom Keystone Correction. Commanded horizontal position of blue raster. Commanded horizontal position of green raster. Commanded horizontal position of red raster Commanded width of raster System Controller Board System Controller Board Model 330. 340SC, and 370SC Service Manual...
  • Page 43 +GHORYK Similar to +BHORYK. -GHORYK Similar to -BHORYK. +RHORYK Similar to +BHORYK. -RHORYK Similar to -BHORYK. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description Raster Timing Generator Vertical Deflection Board Main Horizontal Deflection Coils 2-31...

  • Page 44: Vertical Deflection Board P/N 102521(Vdb)

    (3) CRTs. Drive all correction coils to provide convergence and geometry correction. Scan failure detection for all six main deflection circuits. Vertical size adjustment. Vertical linearity adjustment. 2-32 System Power Supply Model 330. 340SC, and 370SC Service Manual...
  • Page 45 Green deflection, 3XX refers to Blue, 4XX refers to Red (e.g.: R428 is a resistor in the red deflection amplifier). Likewise, the correction amplifiers are numbered 5XX for Green, 6XX for Blue, and 7XX for Red. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description 2-33...
  • Page 46 VDB via the serial bus. To control height, the operator presses the SIZE button on the remote control, then adjusts height with the up and down arrow keys. The ramp generated by the red preamp is used elsewhere in the VDB for the generation of correction signals. 2-34 Model 330. 340SC, and 370SC Service Manual...
  • Page 47 The two (2) waveforms are then summed. This signal is then multiplied by HFDBK from the HDB. The resultant signal, GEOCORR, is sent to the HDB to modulate the horizontal width for side pincushion and keystone correction. Model 330, 340SC and 370SC Service Manual 2-35...
  • Page 48 To control these parameters, the operator selects PINCUSHION POSN from the TIMING SETUP MENU under the MAIN MENU. The left and right arrow keys are then used to vary the position of the corrections. 2-36 button on the remote control can control Model 330. 340SC, and 370SC Service Manual...
  • Page 49 (I = input to VDB, 0 = output from VDB). Also noted is whether the information is transferred over the IIC or the serial bus. A change in output data generates an interrupt pulse. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description 2-37...
  • Page 50 Commanded vertical position of green raster. Commanded vertical position of red raster. Commanded L/R keystone correction. Commanded L/R pincushion correction. Commanded T/B pincushion correction. Commanded overall horizontal linearity correction. System Controller Board Model 330. 340SC, and 370SC Service Manual Description...
  • Page 51 Pulse signal at vertical frequency from the vertical oscillator on the HDB. HLINR Voltage representing commanded horizontal linearity correction. TBKEYCOR Voltage representing commanded top and bottom keystone correction. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description System Controller Board Raster Timing Generator Video Processor Board...
  • Page 52 Power for analog portions of VDB. -15V Power for analog portions of VDB. Power for digital devices on VDB. Return for power on VDB. 2-40 Main Vertical Deflection Coils Correction Coils System Power Supplies Model 330. 340SC, and 370SC Service Manual...
  • Page 53 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. Internal None Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description 2-41...
  • Page 54 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. 2-42 Model 330, 340SC and 370SC Service Manual...

  • Page 55: Video Processor Board P/N 104672 (Vpb)

    LCLV uniformity correction. LCLV bias. Dynamic focus signal modification. The block diagram (Figure 2-15) description, along with the I/O description in the following section, provide information to perform module-level troubleshooting. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description 2-43...
  • Page 56 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.
  • Page 57 C button and using the up and down arrows on the remote control. Green is a master and will control all three (3) colors together. R and B are independent. Model 330, 340SC and 370SC Service Manual 2-45...

  • Page 58: Gamma Correction

    2-46 button and using the up and down arrows on RIGHT Model 330. 340SC, and 370SC Service Manual...
  • Page 59 System Controller Board in real time representing the correction ® necessary to account for sensitivity variations across the ILA Assemblies. The signals for sensitivity correction from the SCB are RSENS, GSENS, and BSENS. Model 330, 340SC and 370SC Service Manual 2-47...
  • Page 60 Selects RGB1 as input. Selects RGB2 as input. Information for setting bias frequency to ILA Assembly. Command to the serial data receiver that the incoming data is to be read. Model 330. 340SC, and 370SC Service Manual ® Assemblies. The ®...
  • Page 61 GSENS Similar to RSENS. BSENS Similar to RSENS. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description Tells SCB that no VABs are reporting problems. Tells SCB that all sweeps are operating. Tells SCB that beam current limiting is occurring.
  • Page 62 HSYNC can be a composite sync. (TP14) VSYNC Vertical Sync. This cannot be a composite sync signal. (TP15) 2-50 System Controller Board Raster Timing Generator Model 330. 340SC, and 370SC Service Manual...
  • Page 63 GVIDCH1 Green video with optional composite sync signal input to channel 1. GVIDCH2 Green video with optional composite sync signal input to channel 2. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description Vertical Deflection Board Video Amplifier Board...
  • Page 64 Composite video signal, pass through to decoder. Luminance signal for SVHS, pass through to decoder. CHROM Chrominance signal for SVHS, pass through to decoder. Return for SVHS; pass through to decoder. 2-52 Image Light Amplifiers Decoder Model 330. 340SC, and 370SC Service Manual...
  • Page 65 The /HVEN signal is allowed to go high shutting down the HVPS. Additionally, a high cutoff signal is sent so RVOUT, GVOUT, and BVOUT will be pulled low. /RENABLE, /GENABLE, and /BENABLE are also pulled Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description System Power Supply...

  • Page 66: Video Amplifier Board P/N 103567 Or 103774 (Vab)

    CRTs except for anode voltage and chassis bond. The following functions are provided by the VPB: Connection of all voltages to CRT. Amplification of video signal. Blanking. DC restore. Bias voltage control. 2-54 Model 330. 340SC, and 370SC Service Manual...

  • Page 67: Video Signal

    The Failure Detection circuit senses the health of the video amp's 100V power supply. When the 100V supply falls below about +64V, the normally low /VIDOK signal is pulled high. The /VIDOK signal is then sent to the VPB. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description 2-55...
  • Page 68 The FOCUS voltage is a pass through from the HVPS to the CRT. It is not in any way modified by the VOB. Filament Supply For the CRT Filament supply, 6.3Vdc from the System PS is simply filtered and sent to the CRT. 2-56 Model 330. 340SC, and 370SC Service Manual...
  • Page 69 VAB, and output to an output from the VAB (e.g.: under Video Processor Board; 'Input'; CLAMP refers to the signal CLAMP that is an input to the VAB from the Video Processor Board). When test points are provided for the I/O they are noted. Model 330, 340SC and 370SC Service Manual 2-57...
  • Page 70 High Voltage Power Supply Inputs Description -200V Power supply to Grid1 regulator. FOCUS Pass-through from HVPS to CRT. +100V to +1400V supply to Grid2. Passes through G2 pulldown circuit for protection. 2-58 Video Processor Board CRTs Model 330. 340SC, and 370SC Service Manual...

  • Page 71: System Controller Board P/N 104668 (Scb)

    Sensitivity and Threshold Correction. The block diagram (see Figure 2-17) description, along with the I/O description in the section following, provide information to perform module-level troubleshooting. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description System Power Supply 2-59...
  • Page 72 The SCB also takes in information on raster and video status from other circuit boards and generates control signals and displays based on that information. 2-60 Model 330. 340SC, and 370SC Service Manual...
  • Page 73 The EPROMs, being non- volatile, will maintain their integrity under all operational conditions. Upgrading the program memory is simply a matter of replacing the EPROMs with the newer version. Model 330, 340SC and 370SC Service Manual 2-61...
  • Page 74 (1) of the four (4) memory chips or a battery losing power while the projector is not plugged in, all of the data in the WCM will be lost. For this reason, it is always a good idea to back up the channel data to an external data storage medium.
  • Page 75 The Digital Signal Processor is a slave processor that operates under the control of the CPU. The DSP does the processing that converts the raw convergence and shading numbers that the operator inputs, into the smooth correction data that Model 330, 340SC and 370SC Service Manual 2-63...
  • Page 76 The Overlay Memory is composed of two SRAMs. They are not battery backed since they store no data that must be held while the projector is not in operation. The Overlay Memory is used to store the bit-mapped information that describes the overlay pattern that is seen on the faces of the CRTs, hence on the screen.
  • Page 77 VPB as the VIDTEST signal. LED Display Buffers and Logic The LED dot matrix display is located on the rear of the projector just under the video and sync input connectors. In that location, it is not physically located on the SCB but it is directly controlled by the CPU with connection via the backplane.
  • Page 78 The SCB polls the boards to see who sent the interrupt. The SCB then reads the information from the IIC bus. One primary use of the IIC in the projector, in addition to its use as a data transfer device, is control of the differential serial communications bus.
  • Page 79 Similar to RSENS. RTHRESH Threshold output from the DAC at 0V to 1V with 140 ohm . GTHRESH Similar to RTHRESH. BTHRESH Similar to RTHRESH. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description Video Processor Board Video Processor Board 2-67...
  • Page 80 (TP4) INTI Indicates when input source signal is interlaced. (TP2) /VSYNC Regenerated vertical sync signal, pulse-shaped to 3 horizontal lines in width. (TP21) Output Description 2-68 Raster Timing Generator Model 330. 340SC, and 370SC Service Manual...
  • Page 81 GXCORR Similar to RXCORR. GYCORR Similar to RYCORR. BXCORR Similar to RXCORR BYCORR Similar to RYCORR. Model 330, 340SC and 370SC Service Manual Chapter 2—Functional Description Vertical Deflection Board SLOAD centering of the red, green and blue rasters respectively; 2-69...
  • Page 82 Low Voltage Power Supply Enable /FANENBL Signal to enable 24V Standby Power /ALENBL Enables Arc Lamp Power Outputs Description LEDDO-6 Data /LEDLT Lamp test /LEDWR Write 2-70 System Power Supply Dot Matrix Status Display Model 330. 340SC, and 370SC Service Manual...

  • Page 83: Backplane Board P/N 100571

    The Backplane does not modify signals in any way—it merely provides an interfacing point for most of the wiring in the projector in lieu of cabling. Refer to Figure 2-18 for a general idea of how the wiring is interconnected in the projector.

  • Page 84: Optical Section

    CRT to the screen and the optical path from the Arc Lamp to the screen. CRT Assembly The image in the projector begins at the three (3) CRTs. The CRT Assembly is located beneath the main electronics card cage and contains three (3) sets of the following: CRT tubes.
  • Page 85 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.
  • Page 86 Blue Dichroic Mirror Green Dichroic Mirror Red Dichroic Mirror Figure 2-19 Optical Block Diagram HJT Model 330, 340SC, and 370SC Service Manual Projection Screen Lens Blue Light Down-steering mirrors steer light to correct prism. Blue Down- Steering Mirror...

  • Page 87: Arc Lamp Assembly

    The projection lens picks up the high intensity image from the prism and transmits it to the projector screen. The projection lenses are individually mounted so they can be focused and aligned separately. The green lens is fixed horizontally and the red and blue lenses allow horizontal movement to align them with the green lens.

  • Page 88: Optical Subassemblies

    Cold mirrors absorb IR light and can get very ® assemblies, and the ultraviolet light would ® Do not attempt to realign any mirrors. They require ® assembly as illustrated in HJT Model 330, 340SC, and 370SC Service Manual assemblies as described...
  • Page 89 Conversely, when the input side is fully illuminated, the liquid crystal rotates the polarized light a full 90º from a horizontal direction to a vertical ® direction. Ninety-nine percent (99%) of the light energy entering the ILA assembly is reflected. Model 330, 340SC and 370SC Service Manual 2-2-77...
  • Page 90 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. 2-78 ® assembly re-enters the prism HJT Model 330, 340SC, and 370SC Service Manual...

  • Page 91: Service Adjustments

    3.12 Arc Lamp Current Adjustment...3-21 3.1 Service (Cover-Off) Power-On Sequence Before applying power to the HJT Model 330, 340SC and 370SC Projector, verify that the projector is connected to the correct power source (refer to Table 0-1 in the Safety chapter). If there is any visible damage to any of the cables do not power on the projector until the damaged cable is replaced.
  • Page 92 (see Figure 3-1). This switch turns on the +5V standby power supply for the main processor. 4. Replace the rear cover on the projector or set the power interlock switch, on top of the system power supply, to the full UP position (see Figure 3-1).

  • Page 93: Crt Yoke Rotation

    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.
  • Page 94 CRT. 7. View R. 8. Rotate the red CRT deflection yoke (on the right of the projector–from the rear) to achieve a level image at the center of the screen (it should be parallel to the green central horizontal line).

  • Page 95: Vertical Size Tracking

    Green vertical size. 7. If unable to match Red or Blue to Green, adjust Green to match the smallest color. 8. Replace the electronics module cover. 9. Replace the rear projector cover. Model 330, 340SC, 370SC Service Manual Chapter 3---Service Adjustments...

  • Page 96: Vertical Linearity Tracking

    Green. 6. Repeat the same procedure for Blue (R-311). 7. Replace the electronics module cover and the projector cover. Blue Vertical Linearity Green Green Vertical Vertical Vertical Linearity Size Size CAUTION!!! Model 330, 340SC, 370SC Service Manual 96 139 171...

  • Page 97: Horizontal Size Tracking

    Blue horizontal size matches Green. 6. Tilt the electronics module back into place. 7. Replace the allen screw from Step 1 above. Model 330, 340SC, 370SC Service Manual Chapter 3---Service Adjustments To prevent possible electrical shock Remove anything plugged into the...

  • Page 98: Ila Bias Settings

    Assemblies ® assemblies, the High Contrast Compensator ® assembly is replaced or ® ® and the blue ILA ® assembly. Model 330, 340SC, 370SC Service Manual ® Bias ® assembly to a ® Biases using the ® ® bias ®...

  • Page 99: Crt Mechanical Focus

    ILA disappears. NOTE: It’s crucial for the optimum operation of the projector to set the bias level to the point where the selected color just begins to appear on the screen.
  • Page 100 The lower-right rod adjusts the bottom position of the CRT The upper-left rod adjusts left-side position of the CRT. Figure 3-4 CRT Focus Adjustment Apertures. Use a 5mm nutdriver to adjust the focus rods inside the apertures. 3-10 Model 330, 340SC, 370SC Service Manual...
  • Page 101 6. Adjust the upper left focus rod of the G CRT focus rods for the sharpest focus at the upper left of the screen in the same manner as in Step 2. 7. Cut off G and view Red. 8. Repeat Steps 2-4 for Red. Model 330, 340SC, 370SC Service Manual Chapter 3---Service Adjustments 3-11...

  • Page 102: Electronic Focus

    2. Cutoff R and B. 3. Continue with a low resolution source (31.5kHz/60Hz) connected to the projector inputs and Size is at 100% from the previous CRT Mechanical Focus procedure. 4. Using a small plastic screwdriver, adjust the electronic focus for Green and observe the center of the screen.

  • Page 103: Jumper Settings

    The Horizontal Scan Reversal Jumper reverses the image projection for front or rear projection. Figure 3-7 illustrates the location of the jumpers on the Horizontal Deflection Board (the board that is furthest from the rear of the projector) and Model 330, 340SC, 370SC Service Manual...
  • Page 104 HDB—Do not tighten connector P11 on the backplane. To set the Horizontal Scan Jumper: 1. Turn power off at the projector and wait about five (5) minutes for the arc lamp to cool. 2. Remove the rear cover from the projector.

  • Page 105: Inverted Vertical Jumpers

    Figure 3-7 illustrates the location of the jumpers on the Vertical Deflection Board (the fourth board from the rear of the projector). The Model 330, 340SC and 370SC Projectors are shipped in the normal vertical projection position with vertical jumpers in J200, J300 and J400 and convergence jumpers in J500, J600, and J700.

  • Page 106: G2 Adjustment

    The high voltage power supply has been repaired; or If the picture size or aspect ratio changes. When the projector is set up for new sources, the Threshold Offset must be set to the default level of 80 prior to setting G...
  • Page 107 Offset. After completing the G-2 setting, verify and readjust these adjustments. Figure 3-9 The Pluge test pattern. Use the two small rectangles in the center to set G2 and Sensitivity Offset. Model 330, 340SC, 370SC Service Manual Chapter 3---Service Adjustments 3-17...

  • Page 108: Arc Lamp Alignment And Focus

    Model 330 Arc Lamp Alignment and Focus To check Model 330 Arc Lamp alignment, confirm the "hot spot" (brightest area) of the screen is centered on a flat field test pattern. If the hot spot is not centered, the Arc Lamp needs alignment.
  • Page 109 3 of 4 Arc Lamp Holding Screws (bottom screw not shown) 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.

  • Page 110: Model 340Sc And 370Sc Arc Lamp Alignment And Focus

    Example: If the screen area is 15x20 = 300 sq. ft. and the light output on the light meter measures 20 foot-candles, the brightness level in lumens is 300x20 = 6000 lumens. 3-20 Z-Axis Screwplate Model 330, 340SC, 370SC Service Manual Y-Axis Plate X-Axis Plate...

  • Page 111: Arc Lamp Current Adjustment

    To check and adjust the Arc Lamp current: 1. Measure the output voltage at the System Power Supply (SPS) Ignitor terminals J503 and J504. Note this figure. Model 330, 340SC, 370SC Service Manual Chapter 3---Service Adjustments Do not leave the roll-off at a value higher...
  • Page 112 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.
  • Page 113 Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-23...
  • Page 114 Remove/Replace) 4.2 Projector Covers...4-5 4.3 Ventilation Filters...4-5 4.4 Arc Lamp Assembly...4-6 Model 330 Ignitor and Arc Lamp Assembly (P/N 900611S) Removal ...4-6 Model 340SC and 370SC Ignitor Assy/Arc Lamp Assy (P/N 104651 or 104120) Removal ...4-8 Collimating (Condensing) Lens Adjustment...4-10 4.5 System Power Supply...4-11...
  • Page 115 Card Cage PCBs. Image Light Amplifier (ILA Projection Lens. Procedures in this manual make reference to the left or right side of the projector. Left and right are determined while standing at the rear of the projector, facing the screen.
  • Page 116 Chapter 4—Maintenance Figure 4-1 Major components of the Model 330 Projector. Model 330, 340SC, and 370SC Service Manual...
  • Page 117 Chapter 4—Maintenance Figure 4-2 Major components of the Model 340SC and 370SC Projectors. Model 330. 340SC, 370SC Service Manual...

  • Page 118: Projector Covers

    Disconnect the fan connector on the left inside of the front cover. 4. Carefully slide the front cover forward and off the projector. 5. To remove the rear cover, from the rear of the projector, grasp the side ribs and lift the whole cover upward and toward the back.

  • Page 119: Arc Lamp Assembly

    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. WARNING!!! exposed inside the projector covers.
  • Page 120 J503 and J504. Figure 4-3 Model 330 Arc Lamp and Ignitor Assembly (P/N 900611S), 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.

  • Page 121: Model 340Sc And 370Sc Ignitor Assy/Arc Lamp Assy (P/N 104651 Or 104120) Removal

    Chapter 4—Maintenance Table 4-1 Ignitor Connections for Model 330 Projector Ignitor Location on Terminal Ignitor Right Side of INPUT Ignition Coil Negative Terminal INPUT Lug mounted on circuit board Negative Terminal INPUT Lug mounted on circuit board Left Side of...
  • Page 122 12. Carefully slide the Arc Lamp assembly out from the right side of the projector. 13. Perform the previous steps in the reverse order to replace the Arc Lamp Assembly. When reattaching the cables, be careful to reconnect them to Model 330, 340SC, and 370SC Service Manual Chapter 4—Maintenance Start Capacitor...

  • Page 123: Collimating (Condensing) Lens Adjustment

    Roll-off is the gradual difference in brightness on the screen from the center to the edges. Try to keep the roll-off between center and edge brightness to 2:1. 4-10 Make adjustments in very small increments Model 330. 340SC, 370SC Service Manual Mounting Screws...

  • Page 124: System Power Supply

    To remove the system power supply (see Figure 4-4 and Figure 4-5 and Figure 4-7): 1. Unplug the projector. Allow at least one (1) minute for high voltage to bleed off before proceeding. 2. Remove the rear projector cover (Section 4.2).
  • Page 125 (Step 4 above), a torque wrench should be used. The Arc Lamp connections to the top of the SPS should be torqued to 25-30 in. lbs. 4-12 AC Power Terminal Block Main AC Circuit Mounting (under lip) Model 330. 340SC, 370SC Service Manual Breaker screws...

  • Page 126: Electronics Module

    The Electronics Module consists of the system power supply, card cage, and CRT housing assembly. To remove the Electronics Module: 1. Unplug the projector. Allow at least one (1) minute for high voltage to bleed off before proceeding. 2. Disconnect the system power supply.
  • Page 127 (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.

  • Page 128: Cathode Ray Tube (Crt)

    CRTs. Dispose of the tube immediately. Model 330 CRT Removal Figure 4-9 Model 330 CRT Assembly To remove a Model 330 CRT Assembly (refer to Figure 4-4): 1. Unplug the projector. Wait at least a minute before proceeding for the high voltage to bleed off.
  • Page 129 CRT (refer to the appropriate model Operator’s Manual). Notes on replacing a Model 330 CRT: Orient the bellows on the front of the CRT to the top side. Remove the plastic coating from the tube screen only after the CRT has been installed.
  • Page 130 Chapter 4—Maintenance Figure 4-10 Model 340SC and 370SC CRT Assembly Figure 4-11 CRT Z-Axis Focus Adjustment Rods (circled). Model 330, 340SC, and 370SC Service Manual 4-17...

  • Page 131: Model 340Sc And 370Sc Crt Removal

    CRT neck. There is one (1) video amplifier board on each CRT. To remove a VAB (see Figure 4-9 or Figure 4-10): 1. Unplug the projector. Wait at least a minute before proceeding for the high voltage to bleed off. 2. Remove the rear projector cover (Section 4.2).

  • Page 132: Crt Yoke

    There is one (1) yoke for each CRT. To remove the CRT yoke (see Figure 4-9 or Figure 4-10): 1. Unplug the projector. Wait at least one (1) minute before proceeding for the high voltage to bleed off. 2. Run the CRT all the way forward (Z axis focus rod, rear of CRT assembly).

  • Page 133: High Voltage Power Supply (Hvps)

    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.

  • Page 134: Card Cage (Printed Circuit Boards)

    PCBs. To remove a PCB: 1. Turn the projector power off at the remote. Wait at least one (1) minute for the high voltage to bleed off. 2. Remove the rear projector cover (see Section 4.2) and toggle the Main Circuit Breaker to off (see Figure 4-7).

  • Page 135: Image Light Amplifier Assembly

    Overtightening can cause unpredictable performance while undertightening may result in improper focus and color reproduction. 4-22 ® Assemblies. To remove ® The ILA assemblies should be clamped only Model 330. 340SC, 370SC Service Manual...

  • Page 136: Projection Lens

    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. Figure 4-12 Projection Lens Locking Rods To remove a projection lens (see Figure 4-12): 1. Turn off the projector.
  • Page 137 Chapter 4—Maintenance Table 4-2 for reference to part numbers, if necessary. 4-24 Model 330. 340SC, 370SC Service Manual...

  • Page 138: Scb) Socket Battery Replacement

    As indicated in the troubleshooting table (under “Picture-Various Problems”, weak backup RAM socket batteries in the SCB can cause lost data when the projector is turned off and back on again. All four (4) of these batteries should be replaced at the same time if this condition occurs.
  • Page 139 Figure 4-14 SRAM Chip, Extension and Battery Side View 6. Carefully reinsert the socket batteries and SRAM chips back into the SCB. 7. Reinstall the SCB. 4-26 CAUTION! Never place the socket battery on Model 330. 340SC, 370SC Service Manual...

  • Page 140: Recommended Spares

    Arc Lamp Assembly Ignitor High Voltage Power Supply Raster Timing Generator Horizontal Deflection Board Vertical Deflection Board Video Processing Board Video Amplifier Board System Controller Model 330, 340SC, and 370SC Service Manual Chapter 4—Maintenance Quantity 340SC PART NUMBERS 104070 104071 900611S 104651...

  • Page 141: Troubleshooting

    5.1 General Information This chapter provides information and solutions on probable projector problems, including Error Codes, Power-On Codes, and Break Points for HJT Model 330, Model 340SC and Model 370SC Projectors with software version 5.1.0. The Error Codes listed in Table 5-1 describe possible problems associated with software and hardware while the projector is operating.
  • Page 142 Chapter 5---Troubleshooting Table 5-1 Error Codes for the Model 330, 340SC and 370SC Projectors On-Screen Text Codes shown along with operator messages. A RAM BATTERY IS LOW COLOR IS CUTOFF DSP INIT FAILURE Convergence logic is dead at power-on. LAMP TO-ON,...
  • Page 143 Verify that +5volts and +24volts standby LEDs are lit. If STB +5volts and +24volts are not present, verify that the projector is plugged into a proper outlet and that the circuit breaker on the right side of the projector is on. If Description ) set takes place when the user issues a “power-on”...
  • Page 144 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.
  • Page 145 When a break (trap) occurs, the CPU stops normal operation and outputs a code to the LED located at the rear of the projector. The code consists of the character “e” followed by a “2” through “C.” The error code displays in a continuous loop.
  • Page 146 R/W, I/N and FC flags and values. Use a Service Report to write down all the break (trap) data. The service report will be analyzed by a Hughes-JVC technician to determine the problem. Model 330, 340SC, and 370SC Service Manual...
  • Page 147 = Submenu available Version 5.1.0 Software Menu Diagram Software versions are indicated on the Status Menu, and may be supplemented in Field Service Bulletins. Model 330, 340SC, and 370SC Service Manual TIMING SETUP MENU 1. PINCUSHION POSN 2. MENU POSITION 3.
  • Page 148 Replace defective CRT or Video on only one Amplifier Board. CRT. Raster present but Replace Video Amplifier Board or no video image. Video Processor Board. Model 330, 340SC, and 370SC Service Manual Possible Solution position. Service Operator Manual Manual 3.1,...
  • Page 149 Assembly. lit. Brightness flicker or Arc Lamp may have too many Picture very hours. dim. Replace Arc Lamp. Chapter 5---Troubleshooting Possible Solution Model 330, 340SC, and 370SC Service Manual Service Operator Manual Manual 4.11 4.11 4.10...
  • Page 150 Adjust using S incorrect. Picture wrap around Reset left or right B left or right edge. Reset T Retrace lines on raster. Model 330, 340SC, and 370SC Service Manual Possible Solution ® ® assembly is installed ® Assembly. ® Assembly.
  • Page 151 E INEARITY OSITION assembly bias voltage bad or ® assembly or Video adjustments. ONTRAST , G2 and HRESHOLD RIGHTNESS Model 330, 340SC, and 370SC Service Manual Chapter 5---Troubleshooting Service Operator Manual Manual 3.3, 3.4 4.8.9 4.11 4.12, 4.8 3.10...
  • Page 152 Video image is not Level projector or rotate CRT level. Yoke. Black band at top of Remove air bubbles from Prism. video. Model 330, 340SC, and 370SC Service Manual Possible Solution ® Assembly Bias HADING offset, ENSITIVITY offset, ENSITIVITY...
  • Page 153 Unplug tethered remote at projector erroneous and reconnect. characters. Infrared I/R Remote No response. Set I/R remote dip switch settings. 5-13 Chapter 5---Troubleshooting Possible Solution Model 330, 340SC, and 370SC Service Manual Service Operator Manual Manual 4.14 Table 5-4 4.11...
  • Page 154 I/R repeater for distances of 50’ or more. Stay in “line of sight”. Sticking keys on the Return remote control for remote control. replacement. Model 330, 340SC, and 370SC Service Manual Possible Solution Service Operator Manual Manual 5-14...

  • Page 155: Glossary Of Terms

    Projector function used to copy geometric and image Copy Channel adjustment data from one channel to any or all of the other 29 input channels Abbreviated as "C." Color information signal or signals. Chrominance Model 330, 340SC, and 370SC Service Manual Glossary...
  • Page 156 G will affect all three colors. A circuit card in a computer that has the function of Graphics Adapter converting signals used in a computer into signals that a monitor can use to display a video picture. Model 330, 340SC, and 370SC Service Manual...
  • Page 157 Appendix 1 for more details. Infrared Repeater Used with rear projection setups. Conveys infrared signals to HJT Series 300 Projector, since I/R remote control signals cannot reach I/R windows on the projector. Model 330, 340SC, and 370SC Service Manual Glossary...
  • Page 158 With distorted linearity, lines in the grid are spaced closer together on one side of the image and farther apart on the other. The linearity adjustment is performed on green only and affects all RGB.. Model 330, 340SC, and 370SC Service Manual...
  • Page 159 (Phase Alternate Line) The 625-line, 50-field system used in the UK, Western Europe, Scandinavia, Australia, South Africa and other countries. Pluge Test pattern used to set B/W scale. Grid of four squares within four squares. Model 330, 340SC, and 370SC Service Manual Glossary...
  • Page 160 Second Audio Program (SAP). Saturated Color 1) A color as far from white, black or gray as it can be (i.e., vermilion rather than pink). Model 330, 340SC, and 370SC Service Manual...
  • Page 161 Used with Black Balance adjustment to obtain optimal projected image. Update Defaults Updates picture setting default data. Technician-defined picture values as default values. User can change values Model 330, 340SC, and 370SC Service Manual Glossary...
  • Page 162 The vertical scan frequency of the input signal. Vertical Scan Frequency (V-Freq) Vertical The number of times per second a frame is transmitted to a video display screen. Synchronization Frequency Xenon Arc Lamp See Arc Lamp. Model 330, 340SC, and 370SC Service Manual...
  • Page 163 Glossary Model 330, 340SC, and 370SC Service Manual...

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