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Chapter 2—Functional Description

Model 330, 340SC and 370SC Service Manual

2-55

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. The video amplifier takes the input signal, amplifies and level
shifts it so that it will be a negative-going 75Vpp signal modulating the +84Vdc
black level, and applies this to the cathode of the CRT. In general, the 84Vdc
black level will be seen only during the DC Restore interval. Power for the video
amplifier is a locally derived 100V that is regulated down from the 107V input
from the SPS.

Failure Detection

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.

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Summary of Contents for 330

Page 1: ...el 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 com DECLARATION OF CONFORMITY PER ISO IEC GUIDE 22 AND EN 45014 ...

Page 2: ...above product complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC 105662 First Edition January 1998 Rev A September 1998 Confidential and proprietary information Copyright 1998 by Hughes JVC Technology Corporation All worldwide rights reserved This manual was produced by Hughes JVC Technology Corporation and may be revised without prior notice No ...

Page 3: ...nings and Cautions in this manual should be read thoroughly and strictly adhered to Warning and Caution symbols and definitions are as follows WARNING Warns user of a potential electric shock hazard and or specific procedure or situation that could result in personal injury if improperly performed CAUTION Warns user of a potential safety hazard or potential light hazards that could cause severe ey...

Page 4: ...unlight or near heat radiating appliances Smoke steam and exposure to direct sunlight could adversely affect the internal components Avoid rough handling when moving your equipment as a strong shock could damage its internal components CAUTION If installing a ceiling mount use only parts supplied or recommended by the manufacturer Observe all instructions and warnings as listed in this manual Proj...

Page 5: ...ot Block Ventilation Blocking air intake or exhaust ports can lead to projector overheating Do not enclose the unit in a restricted space Refer to the appropriate Operator s Manual for physical access and thermal clearance and for specific clearances needed for heat dissipation Allow at least ten 10 minutes for projector cool down before removing power CAUTION Do not unplug the power cord until af...

Page 6: ...gh temperatures 180ºC maximum 300º C or over 500º F Do not touch the xenon arc lamp or any connections when the lamp is ignited or is arcing WARNING BRIGHT LIGHT Never look directly at the Arc Lamp the lighted Projection Lens or into the lamp housing from any distance when the projector is ON and light is projected Direct exposure to light of this brightness can cause severe eye injury WARNING Hig...

Page 7: ...cturer for power and signal connections Installation should be performed by an electrician with current knowledge of electrical codes in the country of use 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 a...

Page 8: ...SC Service Manual 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 ...

Page 9: ...Safety xi Model 330 340SC and 370SC Service Manual ...

Page 10: ...lude any similarities and differences of functional descriptions of Model 330 340SC and 370SC projector electronics service adjustments maintenance removal and replacement of subassemblies and troubleshooting 1 1 Acronyms Used In Manual ALPS Arc Lamp Power Supply CH Channel CPU Central Processing Unit CRT Cathode Ray Tube DSP Digital Signal Processor EPROM Erasable Programmable Read Only Memory F ...

Page 11: ...formation at the front of this manual 1 3 Updates This manual will be updated with information provided by Service Bulletins and manual supplements whenever necessary 1 4 Hardware Compatibility The table below lists part numbers currently compatible between the Model 330 340SC and 370SC projectors and those parts that are different in each Table 1 1 Hardware Compatibility Printed Circuit Boards 33...

Page 12: ...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 lamp 3 000 W Xenon arc lamp Same 5 2 1 software 5 2 1 software 5 2 1 software graphics enhancement graphics enhancement graphics enhancement 30 memories 30 memor...

Page 13: ... 2 54 System Controller Board P N 104668 SCB 2 59 Backplane Board p n 100571 2 71 2 7 Optical Section 2 72 CRT Assembly 2 72 Arc Lamp Assembly 2 75 Optical Subassemblies 2 76 2 8 Image Light Amplifier 2 76 This chapter provides functional descriptions of the major assemblies in the Model 330 340SC and 370SC projectors Emphasis is placed on a description of system components to the functional block...

Page 14: ...per operation Operation of the projector other than for maintenance with the covers removed is not recommended and will void the projector warranty 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 The cover...

Page 15: ...g twist lock plug Model 330 and 340SC use Hubble Model 2323 Model 370SC uses Hubble Model 2623 or equivalent CAUTION Operation at voltages and frequencies outside of these listed parameters may cause damage to the projector and will void the warranty 2 3 Electronics Systems Overview The objective of this portion is to provide a good general understanding of the projector electronics The understand...

Page 16: ...ideo Amplifier Boards 3 Raster Timing Generator Board Horizontal Deflection Board Vertical Deflection Board Lamp Ignitor System Power Supply High Voltage Power Supply There are also image and sync signal inputs an LED display two 2 RS 232 communication ports and two 2 IR receivers for projector control The digital and analog circuits of the System Controller Board direct the operation of image and...

Page 17: ...rate from but communicate directly with the System Controller Board The detailed functional description of the subassemblies are covered below in the following order 1 System Power 2 Card Cage and Circuit Boards 3 CRT Assembly 4 Arc Lamp 2 4 System Power System Power Supply The System Power Supply provides the connection between the external power source and the projector The System Power Supply p...

Page 18: ... position 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 A circuit breaker is located on the right side of the System Power Supply...

Page 19: ...4v J502 J500 J503 J504 To Backplane To Arc Lamp Via Ignitor POWER FACTOR CORRECTION LOW VOLTAGE Power Supply 5v 6 3v 15v 24v 48v 107v ARC LAMP Power Supply and Boost 22v 68a 170v 1 0a LVPSNBL ALENBL From System Controller FANENBL J502 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 O...

Page 20: ...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 SCB senses 5V supply at correct level and enters normal program sequence lamp can be turned on at any time Table 2 1 System Power Supply Voltage Distribution Voltage F a n HV PS CRT SCB HDB VDB VPB RTG VAB Arc La...

Page 21: ...c 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 The SPS provides the power necessary to operate the ignitor The Ignit...

Page 22: ... ALENBL FANENBL LAMP OFF COMMAND FAN DISABLE CPU TIME OUT 5 10 MINUTES ARC LAMP ON 1 2 3 4 5 6 22 30V depending on projector model Figure 2 5 Arc Lamp Ignitor Timing Diagram Arc Lamp Ignitor Timing Diagram Summary 1 The operator powers Arc Lamp on ALENBL and FANENBL from System Controller Board are pulled low SPS receives ALENBL from SCB and turns on the Arc Lamp PS 2 Ignitor receives 170V boost v...

Page 23: ...essary to bias the CRTs The HVPS is controlled by an enable line HVEN originating at the Video Processor Board This enable line is controlled by logic that turns the HVPS off when there is a fault that could damage the CRTs There are two 2 different conditions that could damage the HVPS 1 If the 5V supply to the VPB is interrupted the control and protection is compromised and the HVPS must be turn...

Page 24: ... ANODE BLUE ANODE RED FOCUS GREEN FOCUS BLUE FOCUS RED G2 GREEN G2 BLUE G2 200v 24v GROUND HDFOCUS VDFOCUS HVEN Power and Control Connector 2 3 11 HDFOCUS RTN 8 9 VDFOCUS RTN 7 6 12 High Voltage Power Supply Pins 1 4 5 10 not used Figure 2 7 High Voltage Power Supply Input Output Diagram 12 3 6 9 10 1 4 7 11 2 5 8 Figure 2 8 HVPS Power and Control Connector Jack J603 ...

Page 25: ...VPS to form a composite dynamic focus signal Dynamic focus is necessary to ensure that the CRT electron beam is converged to a point as the beam sweeps across the CRT face Since the CRT faceplate is flat the raster sweep causes a varying path length for the electron beam This means the focus voltage must be varied as the raster is traced Focus voltage cannot be conveniently measured during normal ...

Page 26: ... P N 102523 Vertical Deflection Board VDB P N 102521 System Controller Board SCB P N 104668 Raster Timing Generator and Phase Locked Loop RTG PLL P N 100568 Video Processor Board and optional Decoder Board VPB P N 104672 Figure 2 9 Electronics Card Cage Four 4 fans on the right side of the card cage cool the circuit cards in the card cage These fans are energized by the 24V standby power from the ...

Page 27: ...trix status display are located on the lower left of the rear panel The projector model and serial numbers are also found on the rear panel 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 Table 2 2 Circuit Boards Outside C...

Page 28: ...criptions 2 16 Model 330 340SC and 370SC Service Manual 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 ...

Page 29: ...Chapter 2 Functional Description Model 330 340SC and 370SC Service Manual 2 17 Figure 2 10 Raster Generation Block Diagram ...

Page 30: ...ster 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 ...

Page 31: ...Selector The Sync Detector and Selector take inputs from the Video Processor Board The VPB sends the three 3 sync signals SGSYNC sync on green HCSYNC horizontal or composite sync and VSYNC vertical sync only of any polarity to the RTG These are the sync signals that come from the external source and are what the projector will gen lock to when they are available The sync selector uses a pre determ...

Page 32: ...o 90Khz It will maintain that signal over the full period of the raster including the vertical sync pulse Counters in the PLL circuit also provide clock signals with frequencies of Hx112 Hx4 Hx2 and Hx1 These clock signals are square wave signals and are phase coherent with respect to the H sync signal The Hx224 Hx112 and Hx1 signals are used on both the RTG and the SCB for timing of corrections a...

Page 33: ...image is to be blanked that is sent to the VPB The user selects the actual position of the four sides blanking by adjusting from the remote control The SCB calculates the number of clock pulses to count for each of the four sides based on the input from the user and sends those numbers to the appropriate counters via the IIC serial communication bus signals LBlank RBlank TBlank and BBlank Adjustme...

Page 34: ... HSYNC pulse is active ST clamping is timed with respect to the leading edge of the HSYNC pulse It is seldom used but is necessary when there is no back porch to clamp on image starts immediately after the sync pulse BP will clamp and DC restore shortly after the HSYNC pulse BP clamping is timed with respect to the trailing edge of the HSYNC pulse The timing is calculated to be on the back porch o...

Page 35: ...ts to and outputs from the RTG 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 RTG and output to an output from the RTG e g under System ...

Page 36: ...rectional serial line for synchronous data transfer between SCB and other circuit boards See detailed description for list of signals transferred and data direction Video Processor Board Inputs Description SGSYNC Stripped Green Sync is Sync on Green composite sync signal TP 10 HCSYNC Horizontal Composite Sync TP 9 VSYNC Vertical Sync used only for separate H and V sync TP 21 Outputs Description DC...

Page 37: ...ck condition PLOCK will be sent to the SCB Internal When no external sync signal is present the RTG will select it s internal sync signal thus preventing the need to provide another source for overlay generation Horizontal Deflection Board P N 102523 HDB The horizontal deflection board plugs into the electronics card cage and is the forward most card in the card cage The following functions are pr...

Page 38: ...f 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 ...

Page 39: ...ignal That frequency is approximately 12 5kHz Horizontal Centering Horizontal centering of each raster R G and B is accomplished by applying a direct current bias to each horizontal deflection coil The DC comes from a programmable current source that is in series with the main deflection coil The current source is capable of providing either positive or negative polarity Control input to the curre...

Page 40: ...the horizontal sweep The relays are then switched and the sweep and CRT beams are allowed to return to normal This sequence of events will occur each time the input source to the projector changes regardless of any line rate changes There are four frequency bands and flyback times that can be set The frequency ranges and flyback times are 6 6uS 15 25 1kHz 4 1uS 25 33 1kHz 2 9uS 33 60 1kHz and 2 4u...

Page 41: ...n there is a loss of sweep that may cause CRT damage 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 As long as the flyback amplitude...

Page 42: ...tion is noted with input referring to an input to the RTG and output to an output from the HDB e g under Raster Timing Generator Input VFBST refers to the signal VFBST that is an input to the HDB from the Raster Timing Generator When test points are provided for the I O they are noted Table 2 7 Horizontal Deflection Board I O Signals System Controller Board Inputs Description IICCLK IIC clock line...

Page 43: ...scillator HLINR DC voltage controlling horizontal edge linearity correction HFDBK DC voltage proportional to the H power supply output voltage WIDTH DC voltage indicating commanded width TBKEYCOR DC voltage representing commanded top and bottom keystone correction HSENSRED DC voltage high when flyback pulse for red yoke is present at normal frequencies HSENSBLU Similar to HSENSRED HSENSGRN Similar...

Page 44: ...d on when 1 or more deflection coils not connected INLCK Part of INLCK circuit Minimum Frequency on Oscillators and PLLs Ensures that there will be a sweep in both the horizontal and vertical directions when the sync pulse disappears This is for protection of the CRT phosphor Vertical Deflection Board P N 102521 VDB The Vertical Deflection Board plugs into the electronics card cage and is the seco...

Page 45: ... and inverted operation Generation of wave forms used for dynamic focus The block diagram see Figure 2 13 description along with the I O description in the following section provide information for module level troubleshooting Component numbering on the VDB in general follows the pattern that 2XX refers to components for Green deflection 3XX refers to Blue 4XX refers to Red e g R428 is a resistor ...

Page 46: ...r common amplitude set by the commanded height and are corrected for vertical linearity linearity is individually adjustable by R211 R311 and R411 and raster height is individually adjusted by R228 R328 and R428 The common raster height is adjusted by a signal sent from the SCB to the VDB via the serial bus To control height the operator presses the SIZE button on the remote control then adjusts h...

Page 47: ...and Red The sweep indication circuit combines the vertical current signal with the horizontal flyback signal The signals from Green Blue and Red are then combined to produce a signal SWEEPOK that is sent to the VPB and indicates the health of all of the six 6 sweeps In addition to the SWEEPOK signal there are six 6 LEDs on the VDB which indicate the presence of the individual sweeps The LEDs indic...

Page 48: ...lic signal noted above is also sent out to the VPB as HPARAB to be used in dynamic focus Top and Bottom Pincushion and Keystone Correction A parabolic signal is borrowed from the horizontal linearity correction section for T B pincushion correction It is combined with an operator command signal TBPNCORR to produce a variable amplitude and polarity parabolic signal with horizontal sweep frequency A...

Page 49: ...ive the top and bottom pincushion and keystone correction signal The pin and key correction signal is then combined with the appropriate color s Y correction signal to produce a composite vertical correction signal All six 6 correction signals are then amplified by the correction amplifiers and are sent to their respective yoke coils Serial Communication The VDB uses two 2 separate interrelated se...

Page 50: ...e 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 RTG and output to an output from the VDB e g under Raster Timing Generator Input PCST refers to the signal PCST that is an inpu...

Page 51: ...cushion T B Keystone and horizontal linearity correction Video Processor Board Outputs Description HPARAB Parabolic signal at horizontal frequency for dynamic focus VPARAB Parabolic signal at vertical frequency for dynamic focus SWEEPOK Low indicates that all six sweeps are occurring at normal frequencies Horizontal Deflection Board Inputs Description HSENSRED 15V indicates red horizontal flyback ...

Page 52: ...er plug GVERTYK Similar to RVERTYK GVERTYK Similar to RVERTYK BVERTYK Similar to RVERTYK BVERTYK Similar to RVERTYK Correction Coils Outputs Description RXCORR Supply to the red X correction coil RXCORR Return from the red X correction coil RYCORR Similar to RXCORR RYCORR Similar to RXCORR GXCORR Similar to RXCORR GXCORR Similar to RXCORR GYCORR Similar to RXCORR GYCORR Similar to RXCORR BXCORR Si...

Page 53: ...D 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 Internal None ...

Page 54: ...criptions 2 42 Model 330 340SC and 370SC Service Manual 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 ...

Page 55: ...o the VPB input BNC connectors The input tray is a separate assembly and is not included with the VPB when a new or repaired board is shipped The following functions are provided by the VPB Image and sync signal input Image and sync signal multiplexing Sync signal stripping Brightness and contrast control CRT protection logic Internal and external display multiplexing Image signal gamma correction...

Page 56: ...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 ...

Page 57: ... VSYNC and can be monitored on TP 14 and 15 respectively SG Sync Strip The SG Sync Strip circuit looks at the green image signal between the video MUX and the Brightness and Contrast Amp and sends the signal through a buffer then peak detects the signal The peak detected signal then is compared with a reference voltage to discriminate the sync signal from the video The stripped sync signal is then...

Page 58: ...a linear gray scale on the screen for a linear gray scale input Switch Logic and Video Enable This section controls the overlays and test patterns on the screen as well as providing protective functions Protection of the CRTs is accomplished by sensing dangerous conditions and initiating protective functions There are three 3 conditions that the projector considers dangerous to the CRTs that are a...

Page 59: ... RTG that control DC restore DCRSTR and blanking VIDBLANK and distributes them throughout the VPB and out to the VAB as the signals CLAMP and BLANKING RGB Sensitivity and Threshold Amplifier Each color of video R G and B uses an identical circuit The video signal is taken from the output of the gamma correction section amplified and sent off the VPB to the VAB via signals RVOUT TP1 GVOUT TP2 and B...

Page 60: ...ach individual color The up and down arrows are then used to vary the bias level Dynamic Focus Amplifier The vertical focus amplifier takes the VPARAB signal from the VDB amplifies it and sends it out to the HVPS as the signal VDFOCUS for vertical dynamic focus The HPARAB signal from the VDB is multiplied by the VPARAB signal amplified and also sent out to the HVPS as the signal HDFOCUS for horizo...

Page 61: ...urther subdivided into inputs and outputs In each case the signal s direction is noted with input referring to an input to the RTG and output to an output from the VPB e g under Raster Timing Generator Input VSYNC refers to the signal VSYNC that is an input to the VPB from the Raster Timing Generator When test points are provided for the I O they are noted Table 2 11 Video Processor Board I O Sign...

Page 62: ...I O 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 Raster Timing Generator Inputs Description VIDBLANK Along with RONSCRN GONSCRN BONSCRN and VONSCRN from the SCB and DCRSTR determines whether there is full brightness black gray scale or exter...

Page 63: ... red 100V cathode supply GVIDOK Similar to RVIDOK BVIDOK Similar to RVIDOK Video Amplifier Board Outputs Description BLANKING Pulse signal output that is a buffered replica of the VIDBLANK input from the SCB Indicates the commanded blanking interval during the scan BENABLE Logical connection of video amp sweep and power health indications TTL level output RENABLE Identical to BENABLE GENABLE Ident...

Page 64: ...quare wave to the red ILA TP 20 GLCLV Similar to RLCLV TP 19 GLCLV Similar to RLCLV TP 18 BLCLV Similar to RLCLV TP 17 BLCLV Similar to RLCLV TP 16 Decoder Inputs Description RED Red video signal from decoder GREEN Green video signal from decoder BLUE Blue video signal from decoder SYNC Horizontal sync signal from decoder IICINT Interrupt signal from decoder pass through to SCB CH3SEL Indicates to...

Page 65: ...vertical is not at or above the minimum amplitude and frequency This will cause a cutoff so that RVOUT GVOUT and BVOUT will be pulled low Additionally RENABLE GENABLE and BENABLE will be pulled high resulting in shutdown of grid bias at the Video Output Boards Also the SWEEPOK status bit will be transmitted to the SCB RBEAM Signal representing average red CRT beam current at 1mV 1uA At greater tha...

Page 66: ...d low shutting off the red CRT beam High will result from high on RVIDOK GVIDOK or BVIDOK from the VAB 5V power going down on the VPB or SWEEPOK being pulled high from the VDB GENABLE Similar to RENABLE BENABLE Similar to RENABLE Internal None Video Amplifier Board P N 103567 or 103774 VAB The Video Amplifier Board VAB is mounted on and plugs into the back of the CRT There are three 3 VABs one 1 o...

Page 67: ...put signal will be a maximum of 1Vpp The video amplifier takes the input signal amplifies and level shifts it so that it will be a negative going 75Vpp signal modulating the 84Vdc black level and applies this to the cathode of the CRT In general the 84Vdc black level will be seen only during the DC Restore interval Power for the video amplifier is a locally derived 100V that is regulated down from...

Page 68: ...line Arc Protection The Arc Protection Circuit functions to drain off any energy that arrives at the Video Output Amplifier board due to arcs on the cathode or grids The arc energy is suppressed by sending it directly to the HVPS chassis via the Arc Ground terminal on the board Blanking The Blanking circuit operates by using the BLANKING signal from the VPB The BLANKING signal causes an amplifier ...

Page 69: ...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 under Video Processor Board Input CLAMP refers to the signal CLAMP that is an input to the VAB from the Video Processor B...

Page 70: ...eraged over several lines 1mV 1uA of beam current VIDOK Indicates health of the 100V cathode supply Open collector output opens when supply goes below 64V CRTs Output Description FOCUS Focus voltage directly from HVPS to CRT GRID1 Regulated DC voltage to Grid1 Nominally 81V during normal operation During blanking G1 is 111V and during ENABLE high G1 is 200V GRID2 Variable DC voltage to Grid2 G2 vo...

Page 71: ...The following functions are provided by the SCB Operator Interface IR Interface RS232 Interface On Screen Menus Dot Matrix Display Inter Board Communications and Control IIC Bus Overall system control Serial Bus Power Supply Interface Projector operation Direct operation of the projector by issuing commands based on external directives and internal information Contains program and working memories...

Page 72: ... outside world via the IR or RS232 interface Output communication is accomplished via the RS232 the dot matrix display and the CRT display Control of raster generation by the SCB is limited to primarily controlling geometric and convergence correction while most other raster functions are under local hardware control Video signal control involves choosing which video input to use whether or not to...

Page 73: ... 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 The EPROMs being non volatile will maintain their integrity under all operational conditions Upgrading the program memory is simpl...

Page 74: ... projector loses power for extended periods Although not covered separately by warranty the battery should be able to maintain the stored data for over one 1 year with no power applied to the projector With power applied the battery should remain viable for up to ten 10 years WCM is used as working memory for the CPU All temporary storage of working data during routine CPU operations is done in th...

Page 75: ...come from the RTG to synchronize it with raster generation During the read times the address generator uses the CORRSTRT and MAPST signals from the RTG as timing signals The timing clock used is the HX112 signal Thus the address generator generates addresses at the rate of 112 times the horizontal frequency It does this for 96 clock pulses then stops After the next CORRSTRT signal it generates ano...

Page 76: ...overlay memory 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 The overlay bit map is 192 fields wide out of 224 by the total number of r...

Page 77: ...lane The Dot Matrix Display is used for displaying operational and error codes These codes will assist in troubleshooting and verifying proper operation The Dot Matrix Display receives its data from the CPU via the display buffer RS232 Interface The RS232 Interface is a bi directional communications port The interface protocol is RS232 with two 2 ports one 1 port being fully functional with the ot...

Page 78: ... boards have information to communicate to the SCB an interrupt is generated 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 Serial Interface The Serial Interface is a differential communicat...

Page 79: ...sfer clock SERDATA Serial data transfer Used to transfer the following command data REDBIAS GRNBIAS and BLUBIAS to control the bias on the three 3 ILA s respectively RCONT GCONT and BCONT to control the contrast for the three CRTs and BRIGHT to control the brightness for all three CRTs SERDATA Serial data transfer BONSCRN Output from the overlay interface used to turn blue overlay on and off RONSC...

Page 80: ...ng of a frame Used in the SCB for counting vertical frequency TP5 MAPST Signal used to start the correction and overlay address counters during each vertical sweep TP12 Hx112 Clock pulse at 112 times the horizontal frequency Used for convergence and Z axis correction map generation TP20 Hx224 Square wave signal 224 times the horizontal frequency for overlay map generation horizontal map correction...

Page 81: ... Clock signal for the IIC data bus SERCLK Serial data transfer clock SERCLK Serial data transfer clock SERDATA Serial data transfer Used to transfer the following command data VH VH to control the vertical amplitude height VCENTRED VCENTGRN VCENTBLU to control vertical centering of the red green and blue rasters respectively TRAPCORR to control keystone correction LRPNCORR for left and right pincu...

Page 82: ...ollowing command data HPHASE to control the horizontal phase HLINR to control the horizontal linearity HCENTBLU HCENTGRN HCENTRED to control the horizontal centering of the blue green and red rasters respectively and WIDTH to control the horizontal width of all three rasters and for control of geometric correction SERDATA Serial data transfer System Power Supply Inputs Description 5 0V Power for d...

Page 83: ...t from front IR Receiver Backplane Board p n 100571 The Backplane is a PCB that serves as an interconnecting point for the tethered and IR remotes power supplies CRTs Yokes ILA assemblies PCBs and external video 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 ...

Page 84: ... of the assembly cool the CRT Assembly Procedures for adjusting the yokes and the width coils can be found in Section 3 2 A functional description of the Video Amplifier Boards is provided in Section 2 6 5 Relay Lens The relay lens picks up the CRT image from the face of the CRT and focuses the image to the ILA assembly Image Light Amplifier ILA Assembly At the same time as the image is received a...

Page 85: ...m 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 ...

Page 86: ...Focuses Image onto the ILA Image and High intensity Arc lamp light are combined at the ILA and reflected back toward prism Prism horizontally polarizes the light and directs it to the ILA Also passes reflected vertically polarized light coming from the ILA to the projection lens Generates high intensity light beam Filters infrared light Filters out U V light Condenses the light beam Blue dichroic ...

Page 87: ...Xenon Arc Lamp produces a full screen output of between 3 000 and 6 800 lumens depending on the model of projector The output from the arc lamp along with the output from the ILA Assemblies produces the images on the screen NOTE To protect equipment and personnel against explosion hazard the arc lamp is covered with a safety glass plate and is mounted in a protective metal housing This housing pro...

Page 88: ...el Dichroic Mirrors and Down Steering Mirrors The condensed light beam strikes the first dichroic mirror that is designed to pass red and green light but reflect blue light The blue light is reflected to a down steering mirror which reflects it again directly to the prism in the blue system The red and green light travel on to the next dichroic mirror that passes the red light and reflects the gre...

Page 89: ...iquid crystal layer 45º of rotation for the first pass through and another 45º after being reflected by the internal mirror The axis of the polarized light is proportional to the brightness on the input side of the ILA assembly For example when the photoconductor on the input side is not illuminated the liquid crystal does not rotate the polarized light from the arc lamp Conversely when the input ...

Page 90: ...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 ...

Page 91: ...nt and Focus 3 20 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 To turn o...

Page 92: ...ply to the full UP position see Figure 3 1 WARNING With the cover off the projector be careful not to touch any open parts of the projector Be particularly careful of any high voltage wires large red wires which although heavily insulated could still cause severe electrical shock if the insulation is pinched or damaged NEVER look into the Xenon Arc Lamp light path or directly at any of the project...

Page 93: ...ce of the commands toggles these power sources on and off The lamp and electronics cannot be powered up separately with the remote controls 3 2 CRT Yoke Rotation The CRT deflection yokes are factory set If the CRT image is not level adjust the individual CRT deflection yoke as required see Figure 3 1 WARNING To prevent possible electrical shock when performing the yoke rotation always wear ANSI AS...

Page 94: ...aged when the electronics module is tilted back 6 While observing the center horizontal line on the grid pattern rotate the green CRT deflection yoke the green CRT is in the middle to achieve a level image at the center of the screen if necessary loosen the yoke clamp slightly to adjust it NOTE Whenever adjusting the CRT yoke push forward on the yoke while rotating it to ensure the yoke remains pr...

Page 95: ... 228 in particular should not need to be adjusted unless the Green Yoke or Green CRT has been replaced If the Green Vertical Linearity is off however it should be adjusted In this case Green should then be matched to Red and Blue The Red Vertical Size control is R 428 The Blue Vertical Size control is R 328 To adjust the vertical size controls 1 Press Test 2 to display the White X hatch pattern 2 ...

Page 96: ...d adjust the vertical linearity controls on the Vertical Deflection Board refer to Figure 3 2 NOTE The Vertical Linearity pots are factory adjusted and will not normally need adjustment The Green Vertical Linearity pot R 211 in particular should not need to be adjusted unless the Green Yoke or Green CRT has been replaced If the Green Vertical Linearity is off however it should be adjusted To adjus...

Page 97: ...the gloves are not cracked To adjust the horizontal size tracking 1 Remove the rear cover and electronic module cover by removing the 2 5mm Allen screw holding the electronics module in place and tilting the electronics module see CAUTION below back to gain access to the yoke CAUTION Remove anything plugged into the rear electronics jacks or the plugs could be badly damaged when the electronics mo...

Page 98: ...l manner while viewing the entire ILA assembly area on the paper Note On Super Contrast Ila Assemblies If using optional Super Contrast ILA assemblies the High Contrast Compensator may have to be adjusted for each color prior to performing the ILA bias adjustment This procedure is required whenever an ILA assembly is replaced or if the compensator adjustment lever is inadvertently moved To set the...

Page 99: ...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 Find the spot on the screen where the active color first begins to get brighter and use that as the reference point Go below and above this point to find the setting where one 1 click on the UP key causes an increase in brightness and stop at that poi...

Page 100: ...be adjusted so that each CRT face is completely parallel to its respective ILA assembly i e positioning the CRT screen face planar with the ILA along the x y and z axes Each CRT has three 3 focus rods lower left lower right and upper left The focus rods for each CRT work as follows see Figures 3 3 and 3 4 The lower left rod adjusts the CRT to ILA distance z axis for upper right corner and overall ...

Page 101: ...ods For the Green CRT use a 5mm nut driver to adjust the lower left rod of the Green focus rods see Figure 3 3 Have another person watch the upper right corner of the screen for the sharpest focus as you adjust the rod This focus rod is the CRT z axis position and affects the overall focus Observe the upper right corner because it is the pivot point for the other two focus rods 5 Adjust the lower ...

Page 102: ...hese adjustments Recheck the focus of each color because some interaction between R G and B may occur The electronic focus adjustment panel is located on the High Voltage Power Supply on the left rear side of the projector refer to Figure 3 5 To adjust the electronic focus 1 Press TEST 1 Test Pattern 8 H GRID 2 Cutoff R and B 3 Continue with a low resolution source 31 5kHz 60Hz connected to the pr...

Page 103: ...on orientation jumper settings Orientation Convergence jumpers Vert Def Board Vertical jumpers Vert Def Board Horizontal jumpers Horiz Def Board Front Floor Upright Image J500 J600 J700 J200 J300 J400 J500 Front Ceiling Inverted Image J501 J601 J701 J201 J301 J401 J501 Rear Floor Upright Image J501 J601 J701 J200 J300 J400 J501 Rear Ceiling Inverted Image J500 J600 J700 J201 J301 J401 J500 Front R...

Page 104: ...ed and reinserted after a board failure or when changing the sweep reversal connector A failure can occur if connector J11 on the HDB located at the far right when viewing from the component side does not connect completely with P11 on the backplane To ensure a proper connection between J11 and P11 follow the procedure below NOTE Before installing the Horizontal Deflection Board remove the Vertica...

Page 105: ...ation 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 For other orientations change the jumpers in accordance with Table 3 1 NOTE Do not turn projector upside down or...

Page 106: ... like a CRT or ILA has been replaced 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 G2 Sensitivity Threshold Offset To set the Sensitivity Threshold Offset for a new source 1 Select a channel from the channel list 2 Press CONV to ...

Page 107: ...e while toggling If the background brightness changes as the HIDE key is toggled G2 is set too high and the procedure should be repeated When readjusting G2 look for a slightly less visible small black rectangle in the larger black rectangle 5 Select the Pluge test pattern again 6 Cut off G and view R NOTE When setting the G2 levels for green red and blue they should be set as closely as possible ...

Page 108: ...htness from center to corners should be between 2 1 and 4 1 Do not try to compensate for a dim corner by adjusting the Arc Lamp dimness in one or two corners is usually caused by variations in the ILA assemblies and will be corrected by Shading adjustments Perform the Arc Lamp focusing procedure only if the roll off in all four 4 corners is too high CAUTION In the interest of safety please read th...

Page 109: ... to the corners with the center being the brightest 3 Use a light meter and adjust the Z axis adjustment screw for a roll off drop in brightness from center to corners of a maximum of 4 1 preferably closer to 2 1 Example If the center of the screen measures 20 foot candles the corners should measure 10 foot candles ideally but no less than 5 foot candles CAUTION Do not leave the roll off at a valu...

Page 110: ...niform 2 While viewing Test Pattern 6 Static Flat Field the uniformity on the screen should become more centered also To refocus the Model 340S and 370SC Arc Lamp 1 Adjust the Z axis of the Xenon Arc Lamp using a 9 64 inch hexhead balldriver and rotate the screwhead see Figure 3 9 for overall brightness from the center to the edges with a minimum of roll off roll off is the gradual difference in b...

Page 111: ... at the screen center at the expense of proper roll off Try to keep the ratio between center brightness and edge brightness Roll off is 2 1 to the edge and 4 1 to the corners e g if the center brightness is 20 foot candles the edge brightness should be at least 10 foot candles and preferably 10 foot candles CAUTION Do not leave the roll off at a value higher than 4 1 or the center may be too brigh...

Page 112: ... top of the SPS refer to Figure 4 3 until this result is within the appropriate HJT model spec indicated in Table 3 1 Example for Model 370SC Voltage measured between J503 and J504 28V and voltage measured between pins 3 and 4 of J505 1070mv The product of this is 29960 10 2996W This result is within the Model 370SC spec of 3000W 25W and would not require adjustment Table 3 2 Arc Lamp Current and ...

Page 113: ...Chapter 3 Service Adjustments Model 330 340SC 370SC Service Manual 3 23 ...

Page 114: ...Supply HVPS 4 20 4 11 Card Cage Printed Circuit Boards 4 21 4 12 Image Light Amplifier Assembly 4 22 4 13 Projection Lens 4 23 4 14 SCB Socket Battery Replacement 4 25 4 15 Recommended Spares 4 27 4 1 Introduction This chapter covers procedures on removal replacement and adjustment of a specific assembly or subassembly NOTE Before performing the front or rear cover or replacing any components or s...

Page 115: ... Video Amplifier Board CRT Yoke High Voltage Power Supply Card Cage PCBs Image Light Amplifier ILA Assembly 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 WARNING Disconnect AC power from the projector before performing any removal and replacement procedu...

Page 116: ...Chapter 4 Maintenance Model 330 340SC and 370SC Service Manual 4 3 Figure 4 1 Major components of the Model 330 Projector ...

Page 117: ...Chapter 4 Maintenance 4 4 Model 330 340SC 370SC Service Manual Figure 4 2 Major components of the Model 340SC and 370SC Projectors ...

Page 118: ... first However the rear cover may be removed by itself if necessary 3 To remove the front cover first pull cover forward about 10cm 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 6 To re...

Page 119: ... or Xenon Arc Lamp from a Model 330 Projector Refer to Photo 4 1 for right and left orientation and to perform the following procedure Label any connectors prior to removing to ensure they are reconnected correctly 1 Unplug the projector 2 Remove the front and rear projector covers see Section 4 2 3 Disconnect and label the four 4 high voltage cables that are connected to the Ignitor NOTE If the s...

Page 120: ...ottom screws that attach the Ignitor Assembly to the Arc Lamp rails 10 The units are now separated for returning 11 Perform the above steps in the reverse order to replace the Arc Lamp or Ignitor Assembly When reattaching the cables be careful to reconnect them to their correct terminals in accordance with the way they were labeled in Step 3 above Be sure that the connections are tightened securel...

Page 121: ...Turn power off at the remote and circuit breaker and unplug the projector Do not attempt to remove or replace the Arc Lamp assembly without first ensuring that power is off and the projector is unplugged from the AC wall outlet 2 Remove the front and rear projector covers Section 4 2 3 Put on protective clothing including safety goggles and face shield 4 Disconnect the black and red Arc Lamp high ...

Page 122: ...nt of the Arc Lamp assembly When removing the hex bolts also remove the ground straps and leave them attached to the Relay Lens bracket Figure 4 4 Model 340SC and 370SC Arc Lamp Assembly Figure 4 5 System Power Supply Arc Lamp Connection 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 Assem...

Page 123: ...mall increments to insure lamp integrity lamp overheating may occur if current is abruptly increased Do not increase the current beyond the amount specified in Table 3 1 Section 3 12 or damage to the equipment could occur Collimating Condensing Lens Adjustment To adjust the Collimating Lens refer to Photo 4 4 1 Loosen the 3mm set screw located at the top of the Colliminating Lens housing that the ...

Page 124: ...f the screen 4 5 System Power Supply The System Power Supply is located immediately forward of the electronics card cage 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 3 Remove the two 2 screws from the Plexiglas cover over...

Page 125: ...on the connector wires unplug from power supply by squeezing the latching tabs and pulling on the connector shell or housing 12 Loosen and release the two 2 captive screws at the base of the power supply Figure 4 3 Ensure the nylon spacers on the captive screws do not get lost Be sure to replace them between the power supply and the support lip when reinstalling the power supply 13 Lift the power ...

Page 126: ...e 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 2 a If the system power supply is to be removed from the Electronics Module remove the system power supply following instructions in Section 4 5 2 b If the system power suppl...

Page 127: ...n tilt the card cage back 9 Remove the two 2 hex screws in the base of the electronics module under the card cage Tilt the card cage back forward CAUTION Remove anything plugged into the rear electronics jacks or the plugs could be severely damaged when the module is tilted back 10 Remove the electronics module two people by grasping the handles at the rear and the lip under the system power suppl...

Page 128: ...ss 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 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 2 Remove the electronics module Section 4...

Page 129: ...on the left side disconnect the CRT anode cable from the bulkhead connector Ensure the entire anode cable is free 8 Loosen the yoke clamp and ensure the yoke is loose on the CRT neck 9 Remove six 6 mounting screws at the face of the CRT 10 Gently remove the CRT by sliding it forward out of the yoke and CRT housing 11 Replace the CRT in the reverse order 12 Perform a CRT mechanical focus adjustment...

Page 130: ...Chapter 4 Maintenance Model 330 340SC and 370SC Service Manual 4 17 Figure 4 10 Model 340SC and 370SC CRT Assembly Figure 4 11 CRT Z Axis Focus Adjustment Rods circled ...

Page 131: ...using remove the cable clamp s from the CRT anode cable 7 Inside the CRT housing on the left side disconnect the CRT anode cable from the bulkhead connector Ensure the entire anode cable is free Loosen the yoke clamp and ensure the yoke is loose on the CRT neck 8 Remove three 3 mounting screws at the face of the CRT Gently remove the CRT by sliding it forward out of the yoke and CRT housing 9 Repl...

Page 132: ...ing the VAB 4 9 CRT Yoke The CRT yoke is located on the CRT neck and is supported by the CRT 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 3 Remove the video amplifier board see Section ...

Page 133: ...ft side disconnect all three 3 CRT anode cables from the bulkhead connectors As an added precaution short the anode leads to the High Voltage Chassis ground to bleed off any residual charges Slide the anode wire connectors off their mounting brackets 7 In the bottom rear of the CRT housing cut the tie wraps holding the HV G2 and focus cables 8 Carefully slide all G2 and focus cables out of the CRT...

Page 134: ...ard from its connector s 6 Lift the PCB from the electronics module 7 Replace the PCB in the reverse order NOTE Each PCB has a dedicated card slot with keyed connector positions Observe the connector positions prior to inserting to ensure proper placement CAUTION Before inserting a PCB into the card cage ensure there are no bent pins on any connectors The PCBs may need to be slightly flexed or jos...

Page 135: ...ctor cover Section 4 2 NOTE It may be necessary to remove the left side air baffle cover in order to gain access to the Blue and Green ILA Assemblies To remove the cover remove the three 3 securing screws and pull the cover loose from the velcro tabs 2 Remove the bias connector from atop the ILA assembly to be removed Mark all bias connectors or remove one 1 ILA assembly at a time to avoid misconn...

Page 136: ...n 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 WARNING Be very careful when performing this procedure especially if the projector is tilted downward because the lens can fall out and seriously injure personnel 3 Carefully pull the lens out of the clamp housing 4 Perform the above steps in reverse order to rep...

Page 137: ...Chapter 4 Maintenance 4 24 Model 330 340SC 370SC Service Manual Table 4 2 for reference to part numbers if necessary ...

Page 138: ...ould be replaced at the same time if this condition occurs CAUTION Never place the socket battery on a metal surface The positive and negative terminals could short out and destroy the battery WARNING Danger of explosion if this battery is incorrectly replaced When replacing the Lithium batteries be sure they are ilnstalled with the correct polarity If installed backwards they could explode Replac...

Page 139: ...5 refer to Figure 4 6 for location Remove the four 4 SRAM chips and batteries from the SCB note the position of pin 1 by the key in the chip pin 1 is at the upper left looking down at the chip with the cutout key at the top 4 Carefully separate the socket batteries from the socket extensions see Figure 4 14 DO NOT remove the SRAM chip from the extension 5 Reinsert the SRAM chip and extension into ...

Page 140: ...Series 300 model projectors Table 4 3 Recommended Minimum Spares Description Quantity 330 340SC 370SC PART NUMBERS System Power Supply 1 104070 104071 104038 Arc Lamp Assembly 1 4 900611S 104651 104120 Ignitor 1 102083 102207 104475 High Voltage Power Supply 1 100562 100562 103769 Raster Timing Generator 1 100568 100568 100568 Horizontal Deflection Board 1 102523 102523 102523 Vertical Deflection ...

Page 141: ... is the error description Status or error codes are flashed for no more than one 1 minute before being replaced with the neutral beating 0 zero at a low light level The Power Codes in Table 5 2 show the sequence of codes that occur when the projector power is first turned on The first 1st column indicates the LED code letter or number and the second 2nd column provides a description of the problem...

Page 142: ... problem LED Description Codes indicating temporary error state or hardware problem a An internal table controlling timing is momentarily full e A CPU trap error has occurred This is potentially serious f The internal system command queue is momentarily full g Problem with the terminal in port timing h Problem with the terminal in port operation i Problem with the DSP output circuits convergence m...

Page 143: ...ns are shown on a LED display at the rear of the projector Operations are divided into two 2 sets 1 The first 1st set occurs when standby power is applied For example the projector is plugged into a proper outlet and the circuit breaker on the side of the projector is ON 2 The second 2nd set takes place when the user issues a power on command For example presses Control P on a VT 100 terminal or P...

Page 144: ...set of operations only complete if no errors occur If an error is detected the code corresponding to the failed operation is displayed and remains on the LED until the circuit breaker is cycled or another user Power On command is issued These errors are far more likely to occur than those of the first set Table 5 2 Codes for Second Set of Operations User Power On Code Description F Lamp On not det...

Page 145: ...e 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 Error codes and explanations are provided in Table 5 3 Table 5 3 Break Point Trap Processing Error Codes Code Meaning Description 2 Bus error Probably electrical noise 3 Address error Noise or pro...

Page 146: ...iagnostics menu by performing these steps 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 Break trap data is displayed in the format as indicated in Table 5 4 Table 5 4 Break Trap Data Code Displays Code Description EXCPT N Description per list in the LED display errors above PC Program counter value pr...

Page 147: ...s DECODER SETUP OPTIONAL 1 SELECT STANDARD NTSC M PAL BDGI PAL N SECAM PAL M PAL 4 43 NTSC M NTSC 4 43 BLK WHT The remainder of items in this menu are for use by HJT certified engineers and technicians only ILA BIAS MENU 1 ADJUST WITH VIDEO 2 ADJUST NO VIDEO 3 MAX ON NO VIDEO 4 FREQUENCY ADJUST 5 MAX ON WITH VIDEO MAIN MENU XY REG AXIS MENU 1 OFFSET THIS AXIS 2 CLEAR THIS AXIS 3 CLEAR CONVG AXES 4...

Page 148: ...itch operation If defective replace switch Figure 3 1 Projector cover not enabling interlock switch Reposition rear cover 4 2 System Power Supply shuts down during power up sequence Re seat circuit boards 4 11 No Picture Correct channel selected Select correct channel input 4 2 Arc Lamp turned off Restart projector 3 1 4 1 System power turned off Restart projector 3 1 Video source Verify video sou...

Page 149: ...it 4 11 Increasing G2 voltages decreases brightness level for all CRTs Faulty High Voltage Power Supply under full load Replace High Voltage power Supply 4 10 Arc Lamp Arc lamp will not light clicking sound audible when projector is commanded ON Replace worn out Arc Lamp 4 4 Clicking sound not audible when projector is commanded ON System Power Supply or Ignitor Assembly faulty Replace SPS or Igni...

Page 150: ...effective Ensure ILA assembly is installed correctly and clamps are snug 4 12 CRT focus limited due to focus rod range Readjust fixed rod at upper left of CRT mounting bracket 3 7 Image blurry with shadow on right edge Replace ILA Assembly 4 12 Characters do not appear legible Replace ILA Assembly 4 12 CRT focus problem limited to single color Replace CRT 4 7 G2 mis adjusted Reset G2 3 10 Sensitiv...

Page 151: ...et on CRT 3 2 Horizontal size different between colors Adjust horizontal sizing coil on yoke 3 5 Vertical size different between colors Set vertical size and linearity adjustment on Vertical Deflection Board 3 3 3 4 Not enough range in Red Blue XY convergence Adjust Red or Blue POSITION to compensate 4 8 9 Picture color balance Missing either Red Green or Blue video ILA assembly bias voltage bad o...

Page 152: ...oblems Out of focus blurry area on image limited to R G or B Clean oily spot off CRT Prism or Projection lens Small dark line or dot in R G or B image Scratch in optics or CRT burn Bubbles in R G or B image Replace affected ILA assembly 4 12 Image Ghost on video Replace Burn In CRT or ILA assembly 4 7 4 12 Reversed ghost image on screen If projecting through glass prevent light from reflecting bac...

Page 153: ...nvergence and or shading is incorrect after doing copy channel Menu Position adjustment for the Copied to channel Red bands across image after channel change Channel data not loading properly Upgrade software Communication error Unplug tethered remote at the projector and reconnect Check hardwired cable for broken wires and or if wired for RS 232 null modem Bad RS 232 null modem cable Bad RS 232 i...

Page 154: ...le Solution Service Manual Operator Manual Intermittent operation 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 Sticking keys on the remote control Return remote control for replacement ...

Page 155: ...measured in bits per second in digital and in Hertz in communications Bandwidth is the difference between the lowest and highest frequencies transmitted or received Wider bandwidth provides more information or picture detail capability Blanking Image adjustment used to mask out unwanted anomalies on the picture edges Blanking can be adjusted inward from 0 on the left edge and top and from 100 on t...

Page 156: ... B tubes by aligning their output at a fixed distance from the projector Convergence adjustments include X Y Axis Convergence and Black and White Uniformity CRT Cathode Ray Tube The vacuum tube used as a display screen in video terminals or television sets Commonly called the picture tube Export Channel Exports setup data from projector to computer Useful when servicing See Import Channel Data and...

Page 157: ...ce Horizontal Scan Reversal Jumper Reverses the image projection for front or rear projection Located on the Horizontal Deflection Board Hue Also referred to as tint A specific color such a blue pink or aqua Hue or tint control on a display device adjusts red green balance IDTV Improved Definition Television Improvements that modify NTSC standards Improvements may be at the source or the receiver ...

Page 158: ...eived ISO certification May 15 1997 Keystone Adjustment Corrects lines nearest to the screen edge to make them straight and parallel to the center line of the test pattern or square to the screen edge The keystone adjustment is performed on green only and affects all RGB Keystone Image Distortion resulting from having the projector improperly placed vertically with respect to the screen Lamp Assem...

Page 159: ...that s sending signals to it Multisync monitors can adjust to a range of frequencies but not all of them Noise An undesirable electrical interference of a signal NTSC National Television Standards Committee The NTSC governs the standard for television and video playback and recording in the United States The NTSC standard is 525 lines of resolution and is transmitted at 60 half frames interlaced p...

Page 160: ...er the next horizontal line or field The beam is turned off during retrace RGB Red Green Blue Refers to the method of recording and generating colors in a video system On a television or color monitor colors are displayed as varying intensities of red green and blue dots When red green and blue are all turned on high white is produced When all dots are turned off the base color of the screen appea...

Page 161: ...lat field Synchronization Also called sync for short Working together At the same time horizontal and vertical sync signals from the signal source control the monitor s scan circuits to properly time the lines and frames of a picture Technician Remote Tethered Identical to the I R technician remote with the addition of a 20 character 4 line display Use the tethered remote exactly as you would the ...

Page 162: ...tical 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 V Freq The vertical scan frequency of the input signal Vertical Synchronization Frequency The number of times per second a frame is transmitted to a video display screen Xenon Arc Lamp See Arc Lamp ...

Page 163: ...Glossary Model 330 340SC and 370SC Service Manual ...

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