JVC 340 SC - Manuals

Safety vii Model 330, 340SC, and 370SC Service Manual Avoid Projector Angles of 15 ° to 23 ° Due to voids in the prism fluid there is a dead zone of 19 ° ± 4 ° . For this reason, avoid projector angles of 15 ° to 23 ° . Maximum Projector to Screen Angle is 15 ° The maximum vertical tilt angle from p...

Safety viii Model 330, 340SC, and 370SC Service Manual WARNING!!! High temperature, ultraviolet and infrared light. Refer all service to factory authorized personnel. Ultraviolet radiation, dangerous glare, and high internal gas pressureis present at the Xenon Arc Lamp. It is contained in a protecti...

Safety ix Model 330, 340SC, and 370SC Service Manual ! CRT yoke assemblies and other proximity electrical assemblies, components andwiring—if performing the yoke rotation or width adjustment (outlined in Section3.2), always use an ! ANSI/ASTM 10,000 volt rated safety glove. ! Periodically check the ...

Safety x Model 330, 340SC, and 370SC Service Manual WARNING!!! Various procedures in this manual involve the removal and replacement of system subassemblies. Ensure that the projector AC powerplug is removed from the AC outlet prior to attempting any of these procedures.

Chapter 1---Introduction Model 330, 340SC and 370SC Service Manual 1-1 1.0 Introduction This Model 330, 340SC and 370SC Service Manual combines three (3) similarprojector models into one (1) reference book, and should be used in conjunctionwith the appropriate projector Operator’s Manual. This manua...

Chapter 1---Introduction 1-2 Model 330, 340SC and 370SC Service Manual RTG Raster Timing Generator SCB System Control Board SPS System Power Supply TTL Transistor-Transistor Logic VAB Video Amplifier Board VCO Voltage Controlled Oscillator VDB Vertical Deflection Board VIN Video Input VPB Video Proc...

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Manual 2–1 2.0 Functional Descriptions Contents 2.1 Cover and Base............................................................................................ 2–2 2.2 External Power Requirements .......................................

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Manual 2–3 WARNING!!! The HJT Model 330, 340SC and 370SC projectors use high voltages and high currents. Operation withcovers removed exposes personnel to these dangerous conditionsand may result in serious injury or death. No user...

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Manual 2–5 The Raster Timing Generator provides timing signals to the System ControllerBoard, selects the appropriate incoming sync signal and produces the timingsignals for controlling the geometry of the raster. The Vertical and ...

Chapter 2—Functional Descriptions 2–6 Model 330, 340SC, and 370SC Service Manual All of the SPS output voltages except Arc Lamp power are indicated by a LEDdisplay (see ). The LEDs are located on a bar-type display on the backplane at theleft side of the card cage. The individual LEDs will be lit wh...

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Manual 2–7 The Arc Lamp power supply is a current-controlled supply with an open circuitvoltage of about 170V. When the Arc Lamp is operating at steady state, the powersupply provides the current set by the technician. The output o...

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Manual 2–9 *Current depends on projector model (see Table 0-1 in Safety Chapter). ** Model 340SC = 2000 Watts; Model 370SC = 3000 Watts. Figure 2-4 System Power Supply Input/Output Diagram Arc Lamp Ignitor The ignitor consists of a...

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Model 2-11 High Voltage Power Supply The High Voltage Power Supply is a DC-DC converter (see Figures 2-6 and 2-7)and is located on the left side of the CRT housing. It provides all necessaryvoltages for the CRTs except the cathode ...

Chapter 2—Functional Descriptions 2-12 Model 330, 340SC, and 370SC Service Manual The HVPS provides several voltages to the CRTs: Anode Grid 1 Grid 2 Focus RED ANODE GREEN ANODE BLUE ANODE RED FOCUS GREEN FOCUS BLUE FOCUS RED G2 GREEN G2 BLUE G2 -200v +24v GROUND HDFOCUS VDFOCUS /HVEN Power and Cont...

Chapter 2—Functional Descriptions 2-14 Model 330, 340SC, and 370SC Service Manual As with the other indicators on that LED bar, the LED is in series with currentlimiting resistor, so a lit LED indicates only the presence of a voltage, notnecessarily the correct voltage. The control grid, G1, voltage...

Chapter 2—Functional Descriptions Model 330, 340SC and 370SC Service Model 2-15 The card cage is hinged in the rear to allow it to be folded backward for access tothe CRT housing (when folding the card cage backward be sure that nothing isplugged into the rear electronic jacks or the plugs could be ...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-17 Figure 2-10 Raster Generation Block Diagram

Chapter 2—Functional Descriptions 2-18 Model 330. 340SC, and 370SC Service Manual Raster Timing Generator Board (RTG) p/n 100568 The Raster Timing Generator board is located in the electronics card cage and plugs intothe backplane. It is the second board from the rear of the card cage and consists o...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-19 The following functions are provided by the RTG: Internal sync generation. Sync detection and selection. Serration and equalization pulse removal. Timing clock pulse generation. VSYNC separation and field detection. Timi...

Chapter 2—Functional Descriptions 2-20 Model 330. 340SC, and 370SC Service Manual Serration and Equalization Lockout The Serration and Equalization Lockout takes a composite sync signal and removes anyequalization and serration pulses from it. The Model 330, 340SC and 370SC projectorsdo not require ...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-21 shaped to be three (3) horizontal periods in length. This signal, /VSYNCSC (pulse-shaped vertical sync) is then sent to the SCB and the VPB. Adjustment Counters The adjustment counters implement the following timing func...

Chapter 2—Functional Descriptions 2-22 Model 330. 340SC, and 370SC Service Manual method as the /CORSTRT signal but has a separate command from the SCB. It controlsthe timing of the top and bottom pincushion correction, top and bottom keystonecorrection, and horizontal linearity correction. The sign...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-23 I T Blank Commanded position of top blanking. I B Blank Commanded position of bottom blanking. I /STBP Command for DC restore timing on either leading or trailing edge of sync pulse. I DC Restore Delay Commanded timing o...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-25 System Power Supply Inputs Description +15V Power for the analog section of the RTG including the PLL. (TP 30) -15V Power for the analog section of the RTG including the PLL. (TP 29) +5V Power for the digital portions of...

Chapter 2—Functional Descriptions 2-26 Model 330. 340SC, and 370SC Service Manual Figure 2-12 Horizontal Deflection Board Block Diagram Vertical Oscillator The function of the vertical oscillator is to lock to the vertical signal, /VFBST, sent by theRTG, and produce a pulsed output, VERTDR, of the s...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-27 The purpose for having an oscillator for the vertical sweep circuit is to maintain a sweepeven in the event of loss of vertical sync signal to prevent damage to the CRT. Thevertical oscillator has a free-run frequency of...

Chapter 2—Functional Descriptions 2-28 Model 330. 340SC, and 370SC Service Manual The first is an input derived from the F to V in the horizontal PLL circuit. This presets theoutput of the supply to a voltage that will provide a nominal raster size for the horizontalfrequency applied. The second inp...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-29 The three (3) horizontal deflection coils (B, G, and R) are driven in parallel by a singledrive circuit and transistor. This is the reason for the inability to remotely control thethree (3) raster widths independently. S...

Chapter 2—Functional Descriptions 2-30 Model 330. 340SC, and 370SC Service Manual Bus I/O Information Description IIC I Serial data load Command to the serial data receiver that the incoming data is to be read. Serial I HPHASE Commanded horizontal phase of picture. Serial I HLINR Commanded amount of...

Chapter 2—Functional Descriptions 2-34 Model 330. 340SC, and 370SC Service Manual Figure 2-13 Vertical Deflection Board Vertical Preamps The vertical preamps (B, G, and R) each generate a ramp signal with the frequencydetermined by the incoming signal VERTDR from the Horizontal Deflection Board. The...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-35 Vertical Amplifiers The Vertical Amplifiers take the ramp signals generated by the Vertical Preamps andprovide further modification prior to driving the vertical deflection coils. Individualcentering signals, set by the ...

Chapter 2—Functional Descriptions 2-36 Model 330. 340SC, and 370SC Service Manual A form of the vertical frequency parabolic waveform that is derived from the red ramp isalso sent out to the VPB as VPARAB for use in the dynamic focus circuit. Horizontal Linearity Correction The Horizontal Linearity ...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-37 Correction Amplifiers There are six (6) correction amplifiers. Each one receives a real-time convergencecorrection signal: RXCORR. RYCORR. GXCORR. GYCORR. BXCORR. BYCORR, from the SCB convergence section. The X-correctio...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-41 Interlocks and Shutdowns Input HSENSRED - Used to shut down the CRT beams in the event of horizontal sweepfailure. HSENSGRN - Identical to HSENSERED. HSENSBLU - Identical to HSENSERED. Output /SWEEPOK Indicates whether o...

Chapter 2—Functional Descriptions 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.

Chapter 2—Functional Descriptions 2-44 Model 330. 340SC, and 370SC Service Manual Figure 2-15 Video Processor Board, Block Diagram Decoder The optional decoder is a daughter board installed on the VPB. Since the VPB canonly operate on an RGB/sync signal, use of the decoder is necessary in order fort...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-45 further use in the Video Processor Board. The IIC bus is used by the decoder toselect either Channel 3 (NTSC) or Channel 4 (S-Vid). The two (2) signals aremultiplexed together on the decoder board for export to the Video...

Chapter 2—Functional Descriptions 2-46 Model 330. 340SC, and 370SC Service Manual Adding a DC offset to the output of the amplifier controls brightness. Thebrightness is controlled by the SCB via the IIC interface. The operator controlscontrast level by pressing the B RIGHT button and using the up a...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-47 A defective video amp is detected by the state of the /RVIDOK, /GVIDOK, and/BVIDOK signals arriving from the VABs. A loss of +5V power to the VPB isdetected by observing it internally to this circuit. When any one of the...

Chapter 2—Functional Descriptions 2-48 Model 330. 340SC, and 370SC Service Manual Video signal cutoff is accomplished by pulling blanking to zero. ILA® Bias ILA ® Assembly biasing is accomplished by generating a pseudo-square-wave with frequency set by the operator. The SCB sends the information on ...

Chapter 2—Functional Descriptions 2-54 Model 330. 340SC, and 370SC Service Manual high resulting in shutdown of grid bias at the Video Amplifier Boards. Also,the SWEEPOK status bit will be transmitted as a low to the SCB. /GVIDOK Similar to /RVIDOK. /BVIDOK Similar to /RVIDOK. Output /HVEN When eith...

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 informationto perform module-level troubleshooting. Figure 2-16 Video Amplifier Board, ...

Chapter 2—Functional Descriptions 2-60 Model 330. 340SC, and 370SC Service Manual General Functional Description The system controller board receives external commands, interprets thosecommands, and issues internal commands to control the operation of the arc lamp,light valves, raster generation, vi...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-61 Figure 2-17 System Controller Board, Block Diagram CPU The central processor (CPU) is a Motorola MC68302 embedded controller and isthe main controlling component of the projector. Operation of the CPU is controlled by th...

Chapter 2—Functional Descriptions 2-62 Model 330. 340SC, and 370SC Service Manual As the CPU processes information, it is stored in the Working and CompressedMemory. This includes all temporary storage as well as the channel data that theoperator sets while ‘tweeking up’ the projector. All communica...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-63 The digital information that is to be used for raster correction is stored in bit-mapform. The bit-map is 96 fields (out of 112) wide by the number of horizontal linesin a frame wide. Each address in the EXM corresponds ...

Chapter 2—Functional Descriptions 2-64 Model 330. 340SC, and 370SC Service Manual drives the correction amplifiers. The raw (compressed) data is stored in the WCMwhile the smooth (expanded) data is stored in the EXM. When a channel change occurs in the projector, the compressed correction datathat i...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-65 each line in the raster. The starting address is timed by the /MAPST signal. Whenthat comes along, it indicates the top of the raster is beginning so the addressgenerator should begin counting at the beginning. Overlay I...

Chapter 2—Functional Descriptions 2-66 Model 330. 340SC, and 370SC Service Manual There are three (3) ports for receiving IR radiation. One (1) is located on the frontof the projector just above the Green projection lens and the other two (2) arelocated on the rear panel. One of the receivers on the...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-71 /LEDBL1 Brightness /LEDBLO Brightness RS-232 Interface Signals RS232 #1 RS232 #2 Description RXD1 RXD2 Receive data TXD1 TXD2 Transmit data /CTS1 /CTS2 /Clear to send /RTS1 /RTS2 /Ready to send DCD1 Carrier detect COMRTN...

Chapter 2—Functional Descriptions 2-72 Model 330. 340SC, and 370SC Service Manual Figure 2-18 Backplane Interface Block Diagram 2.7 Optical Section The Optical section consists of the CRT Assembly, the Arc Lamp Assembly, andthe Optical subassemblies, which provides the image to be viewed on the scre...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-73 light. The vertically polarized light then passes through the prism to the projectorlens. The ILA ® assembly combines the input signal from the CRT with the high intensity light from the arc lamp. Thus, the brightness of...

Chapter 2—Functional Descriptions ! 2- 2-74 HJT Model 330, 340SC, and 370SC Service Manual CRT RelayLens ILA ProjectionLens Screen CRT Image Combined Image and HighIntensity Light=Bright Image ArcLamp ColdMirror UV Filter andCondensingLens Prism Blue Dichroic Mirror Green Dichroic Mirror Red Dichroi...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-75 Prism The prism receives the high intensity light from the xenon arc lamp and polarizesthe light horizontally. The prism reflects virtually all of this light toward the ILA ® assembly. This light is then phase modulated ...

Chapter 2—Functional Descriptions 2-76 HJT Model 330, 340SC, and 370SC Service Manual Optical Subassemblies Cold Mirror The Cold Mirror lets most of the infrared light pass through and reflects the rest ofthe light toward the prism through an ultraviolet filter/condensing lens, dichroicmirrors and d...

Chapter 2—Functional Description Model 330, 340SC and 370SC Service Manual 2-2-77 horizontally polarized light is sent through the liquid crystal layer of the ILA ® assembly, reflected by a dielectric mirror surface, and then sent back through theliquid crystal layer on the way out of the ILA ® asse...

Chapter 2—Functional Descriptions 2-78 HJT Model 330, 340SC, and 370SC Service Manual Figure 2-21 Simplified illustration of the Series 300 Projector optical path The phase modulated light exiting the ILA ® assembly re-enters the prism assembly that, in this direction, passes vertically polarized li...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-1 3.0 Service Adjustments Contents 3.1 Service (Cover-Off) Power-On Sequence .................................................. 3-13.2 CRT Yoke Rotation..............................................................................

Chapter 3---Service Adjustments 3-2 Model 330, 340SC, 370SC Service Manual with the remote. Then turn the projector power back off withthe remote. This allows power to be reapplied to the fans tocool the arc lamp that remains very hot even after power isremoved. During a normal power shutdown the fa...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-3 1. Press the Power ON key to turn on the projector (press both power keyssimultaneously if using the tethered remote). The Ignitor circuit will ignitethe arc lamp and power will be applied to the electronics system. NOTE: If ...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-5 9. View B. 10. Rotate the blue CRT deflection yoke to achieve a level image at the centerof the screen (it should be parallel to the green and red grid center lines). 11. Retighten the yoke clamp so it is secure. Be careful n...

Chapter 3---Service Adjustments 3-6 Model 330, 340SC, 370SC Service Manual R 328 R 411 R 311 R 211 R 228 R 428 BlueVerticalSize RedVerticalLinearity BlueVerticalLinearity GreenVerticalLinearity GreenVerticalSize RedVerticalSize R 36 R R R 96 139 171 CAUTION!!! Do not adjust the pots that are shaded!...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-7 3.5 Horizontal Size Tracking The horizontal width coils are factory adjusted and will not normally needadjustment. In general, if the R and B vertical lines are within two (2) crosshatchlines of each other, they can be brough...

Chapter 3---Service Adjustments 3-8 Model 330, 340SC, 370SC Service Manual 8. After Yoke rotation, readjust Geometry, Convergence and CRTMechanical focus. 3.6 ILA ® Bias Settings The ILA ® Bias settings are factory set and should not normally need adjustment unless specific maintenance has been perf...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-9 1. Select ILA ® Menu, from the Main Menu. 2. Select Frequency Adjust from the ILA ® Bias Menu. 3. A frequency of 1.8 kHz is acceptable for general video viewing. A lowerfrequency (as low as 1.5 kHz) will provide a brighter im...

Chapter 3---Service Adjustments 3-12 Model 330, 340SC, 370SC Service Manual 9. Cutoff R and view B. 10. Repeat Steps 2-4 for Blue. 3.8 Electronic Focus The Electronic Focus adjustment is factory-set and should not need to be adjusted.Whenever a major component has been replaced, like a CRT, or if th...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-13 Figure 3-6 Electronic Focus and G2 Adjustments NOTE: The Electronic focus and G2 adjustments are located on the high voltage power supply on the rear-left side of the projector under the cover. 3.9 Jumper Settings Table 3-1 ...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-15 4. Pull out the Horizontal Deflection board and verify that the horizontal scanjumper is properly inserted for front (J500) or rear (J501) projection,depending on your application (refer to Figure 3-6 and Table 3-1). Changej...

Chapter 3---Service Adjustments 3-18 Model 330, 340SC, 370SC Service Manual 3.11 Arc Lamp Alignment and Focus The Arc Lamp must be realigned and refocused whenever the lamp is replaced orbecomes defocused or misaligned from physical shock to the projector.Refocusing only may be required if the Arc L...

Chapter 3---Service Adjustments 3-20 Model 330, 340SC, 370SC Service Manual Model 340SC and 370SC Arc Lamp Alignment and Focus To check Model 340SC and 370SC Arc Lamp alignment, observe the anodeshadow on the blue dichroic mirror (the blue dichroic mirror is the first mirrorafter the condensing lens...

Chapter 3---Service Adjustments Model 330, 340SC, 370SC Service Manual 3-21 Figure 3-9. Model 340SC and 370SC Arc Lamp Adjustments 3. Verify that the condensing (collimating) lens assembly has not moved (seeFigure 4-1 or 4-2 and Photo 4-4). Check to see if the assembly is loose. Itshould be unmovabl...

Chapter 3---Service Adjustments 3-22 Model 330, 340SC, 370SC Service Manual 2. Measure the number of millivolts between pins 3 and 4 on SPS J505. NOTE: This circuit is designed so that the number of millivolts between these pins (for Models 340 and 370, it is millivolts divided by 10)represents the ...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-1 4.0 Maintenance Remove/Replace) Contents 4.1 Maintenance Remove/Replace) .................................................................... 4-1 4.2 Projector Covers ...................................................................

Chapter 4—Maintenance 4-2 Model 330. 340SC, 370SC Service Manual ➨ Wait at least a minute after turning off power and removing thepower plug for the high voltage to bleed off. ➨ Observe all cautions and warnings printed on labels. ➨ Observe proper electrostatic discharge procedures. The major remova...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-3 Figure 4-1 Major components of the Model 330 Projector.

Chapter 4—Maintenance 4-4 Model 330. 340SC, 370SC Service Manual Figure 4-2 Major components of the Model 340SC and 370SC Projectors.

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-5 4.2 Projector Covers To remove the two-piece projector cover: CAUTION! When removing the projector covers do not bump any internal components of the projector. If any undue resistance is felt,pause to locate the source of resistanc...

Chapter 4—Maintenance 4-6 Model 330. 340SC, 370SC Service Manual NOTE: This filter can also be removed, while leaving the rear cover in place, by removing the two screws at the top of the side panel where thefilter is located. Slide the panel up and out. 4.4 Arc Lamp Assembly The Arc Lamp Assembly, ...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-7 Figure 4-3 Model 330 Arc Lamp and Ignitor Assembly (P/N 900611S), shown without Heat Sink attached) 5. Remove the three (3) Hex-head screws that attach the Ignitor Assembly tothe Arc Lamp rails. 6. Put on protective clothing, inclu...

Chapter 4—Maintenance 4-8 Model 330. 340SC, 370SC Service Manual Table 4-1 Ignitor Connections for Model 330 Projector Ignitor Terminal Location on Ignitor Wire Color Wire goes to: POS INPUT Right Side of Ignition Coil Red J504 (+) terminal on System Power Supply. NEG INPUT Negative Terminal Lug mou...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-9 10. Remove the two (2) ground straps (not shown in Photo 4-2 or Photo 4-3)from the top, right side of the Arc Lamp assembly housing. Leave thesestraps attached to the Collimating Lens housing. 11. Remove the two (2) hex bolts on th...

Chapter 4—Maintenance 4-10 Model 330. 340SC, 370SC Service Manual their correct terminals in accordance with the way they were labeledabove. Be sure that the connections are tightened securely. NOTE: Whenever an Arc Lamp is replaced the Collimating Lens may need tobe readjusted to obtain maximum bri...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-11 Example: If the center brightness is 20 foot-candles, the ideal edge brightness should be 10 foot-candles. CAUTION! Do not allow roll-off to be greater than 4:1 or damage to the Cold Mirror could result. Refer to Section 3.11infor...

Chapter 4—Maintenance 4-12 Model 330. 340SC, 370SC Service Manual Figure 4-7 System Power Supply (right side of projector) 7. Remove the grounding cable from the right side of the power supply (seeFigure 4-7). 8. Loosen and release the two (2) captive screws at the base of the powersupply, located o...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-13 J501 J500 J502 Wire BundleClamp CARDCAGE SYSTEMPOWERSUPPLY ARCLAMPASSEMBLY HIGH VOLTAGEPOWER SUPPLY TIE WRAP BACKPLANE ANODE LEADS CAPTIVE SCREWS } SYSTEM POWERSUPPLYCONNECTORS Figure 4-8 System and HV Power Supply (left side of p...

Chapter 4—Maintenance 4-14 Model 330. 340SC, 370SC Service Manual 4. At the rear of the projector, remove the three (3) filter housing screws(located under the rear lip of the projector base-plate) and remove the filterhousing. 5. On the left side of the projector, unplug connectors P82 and P83 from...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-15 4.7 Cathode Ray Tube (CRT) Three (3) cathode ray tubes are located in the CRT assembly below the card cageand system power supply. The following procedure is used to remove any CRT: WARNING !!! Handle a CRT with extreme caution. I...

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 ).

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-19 3. Ensure that all control cables are disconnected from the back of thecardcage then tilt the card cage back to expose the inside of the CRThousing. 4. Unplug and label the five cables connected to the VAB. 5. Unplug and remove th...

Chapter 4—Maintenance 4-20 Model 330. 340SC, 370SC Service Manual 7. Perform a CRT mechanical focus adjustment (Section 3.7) and yokealignment (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 housingasse...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-21 4.11 Card Cage (Printed Circuit Boards) The card cage is located at the rear of the projector above the CRT housing. CAUTION! Printed circuit boards in the electronics module are susceptible to electrostatic damage. While servicin...

Chapter 4—Maintenance 4-22 Model 330. 340SC, 370SC Service Manual To ensure a proper connection between J11 and P11 follow the procedure below: Before installing the Horizontal Deflection Board, remove the Vertical DeflectionBoard. This allows for a full inspection of the proper connection of J11 an...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-23 4.13 Projection Lens Projection lenses are located at the front of the projector and are held in place byfriction clamps called Lens Locking Rods. Figure 4-12 Projection Lens Locking Rods To remove a projection lens (see Figure 4-...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-25 Table 4-2 Lens Replacement Lens Throw Lens Part Number or Designation Ratio Red Green Blue 1.5:1 101241 101241 101715 3:1 900609-3 900609-2 900609-1 5:1 101239 101239 101239 7:1 101240 101240 101240 NOTE: More details on lens opti...

Chapter 4—Maintenance 4-26 Model 330. 340SC, 370SC Service Manual Figure 4-13 System Controller Board SRAM Chips Location. CAUTION! Never place the socket battery on a metal surface! The positive and negative terminals of thebattery will short out and destroy the battery! 3. The four (4) socket batt...

Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-27 4.15 Recommended Spares It may be advisable to maintain a supply of spares to maximize performance. Thisis particularly important if projectors are being operated on a continuous basis orwhen multiple projectors are used. Table 4-...

Chapter 5---Troubleshooting 5-1 Model 330, 340SC, and 370SC Service Manual 5.0 Troubleshooting Contents 5.1 General Information .................................................................................... 5-15.2 Troubleshooting ...................................................................

Chapter 5---Troubleshooting 5-3 Model 330, 340SC, and 370SC Service Manual LED On-Screen Text Description x Problem with decoder module data. y Problem with decode input. # Loss of horizontal sweep detected. Codes indicating a software bug—system should keep running. G Internal error code not recogn...

Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-4 STB +5volts or +24volts are still not present after verifying that the circuitbreaker is on and the projector is plugged in, the System Power Supplymay be defective. NOTE: Only the +5 volts LED is lit on the Backplane Status ...

Chapter 5---Troubleshooting 5-5 Model 330, 340SC, and 370SC Service Manual 5.3 Break Points Break Points (or Trap Processing) handle internal interrupts generated by theprocessor, such as: bus errors, illegal instruction, and divide by zero commands. Perform the following steps to setup for break co...

Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-6 Resetting the Projector The projector’s processor must be reset if a break (trap) condition occurs. Theprocessor can be reset by either of the following methods: 1. Cycle main power off, then back on (allow ten minutesfor Arc...

Chapter 5---Troubleshooting 5-7 Model 330, 340SC, and 370SC Service Manual 5.4 Main Menu Structure 1. CHANNEL MENU >2. STATUS MENU3. ILA MENU >4. DIAGNOSTIC MENU >5. TIMING MENU >6. VIDEO QUICKSET >7. GRAPHIC ENHANCE > CHANNEL MENU 1. CHANNEL LIST2. AUTOSELECT L IS T3. COPY CHANNEL...

Chapter 5---Troubleshooting 5-9 Model 330, 340SC, and 370SC Service Manual Problem and Symptom to Check Possible Solution Service Manual Operator Manual LEDs 200, 300, or 400 on theverticaldeflection areunlit. Replace Vertical Deflection Board. 4.11 LEDs 200 and 201, or 300 and 301,or 400 and 401on ...

Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-10 Problem and Symptom to Check Possible Solution Service Manual Operator Manual Image out of focus Spacer balls not visible. Set projection lens focus so ILA ® spacer balls are visible. 4.5 ILA ® Spacer balls visible butimage ...

Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-12 Problem and Symptom to Check Possible Solution Service Manual Operator Manual Bright Red, Green or Blue area onscreen limited tocorners or edge. Adjust ILA ® Assembly Bias and S HADING . 3.6 4.10 Gray scale green in bright l...

Chapter 5---Troubleshooting 5-13 Model 330, 340SC, and 370SC Service Manual Problem and Symptom to Check Possible Solution Service Manual Operator Manual Data lost when projector isturned off andback on. SCB socket batteries weak. “RAM BATTERY LOW” may appearon screen. 4.14 “Flagwaving” at top of pi...

Glossary Model 330, 340SC, and 370SC Service Manual Glossary of Terms Adjust Flat Fld Flat field test pattern used for shading purposes, (adjusts in 7º increments). Amorphous Without definite form; not crystallized. Arc Lamp The xenon arc lamp in the Series 300 series projectors. Produces dangerousl...

Glossary Model 330, 340SC, and 370SC Service Manual temporarily with the Executive I/R remote. Vertical Resolution The amount of detail that can be perceived in the vertical direction; the maximum number of alternating white andblack horizontal lines that can be counted from the top of thepicture to...