MP8620 Multimedia Projector Service Manual 3M Visual Systems Division 6801 River Place Boulevard Austin, Texas 78726-9000 Printed in U.S.A. ©3M 6/99 78-6970-8988-2 Rev.
3M Multimedia Projector MP8620 Table of Contents MP8620 Table of Contents 1. Adjustments ...................................................................................................................................................1-1 1-1. Overview ............................................................................................................................................1-1 1-2. Static Control ...........................................................................................
M Multimedia Projector MP8620 3-4. Table of Contents General/Projection Image Troubleshooting .......................................................................................3-7 3-4-1. Image is Disturbed or Unstable .............................................................................................3-7 3-4-2. No Computer Image Projected..............................................................................................3-7 3-4-3. No Video Image Projected ........................
3M Multimedia Projector MP8620 Adjustments 1. Adjustments 1-1. Overview Make advanced adjustments to the MP8620 in a clean environment with minimal dust and positive pressure. This section provides the advanced adjustment procedures needed to maintain a high quality projection image. There is a specific order that adjustments are to be made and specific tools needed to complete each adjustment.
3M Multimedia Projector MP8620 1-4. Adjustments Technician Tools Test Generator: 3M recommends the Quantum Data™ 801GX Video Test Generator (shown to right) or Extron™ VTG200 Video Test Generator be used for all advanced adjustment procedures. Use to input a test pattern prior to adjustments. External Power Supply: Used to check the audio interface PCB’s. Service Interface Cable: Used to connect the original disassembled power supply with the interface board.
3M Multimedia Projector MP8620 1-5. Adjustments Return to Default Settings 1. Power down the projector and turn the main power switch to off. Press and hold both the Enter button and the Down Arrow button on the control panel 2. Turn the main power switch to on. The default settings are restored and the following message appears: Parameter Factory Settings Restored. Resetting a projector to its default factory setting may resolve a “no input detected” error message for an RGB or video input device.
3M Multimedia Projector MP8620 1-6. Adjustments Cleaning the LCD Panel Dust particles can accumulate on the glass covering the LCD panel causing spots on the projection image. Periodic cleaning is necessary to maintain a high quality projection image. 1-6-1. Checking for Dust Test for dust on the LCD panel by projecting a white image: 3. With the projector off, plug in the video test generator to an RGB terminal jack located on the back side of the MP8620. 4.
3M Multimedia Projector MP8620 1-7. Adjustments LCD Panel Alignment Periodic LCD panel alignment is necessary to maintain a high quality projection image. 1-7-1. LCD Verification and Alignment Use the LCD Alignment tool (DY-0205-1508-5) to verify the 8° angle of the LCD unit. 1. Measure the angle between the bottom and the assembly surface of the LCD on the linkage side. Alignment Lever 2. If the angle is not 8°, reform the alignment lever to obtain the proper 8° setting.
3M Multimedia Projector MP8620 Adjustments 1-7-3. LCD Ribbon Cable Installation Installing a new LCD ribbon cable is done using the following steps: 1. Gently pull out the white plastic clamp on the LCD and Interface board connectors to release the LCD ribbon cable. 2. Insert one end of the new ribbon cable into the LCD connector. The blue side of the cable should be facing up. 3. Insert the other end of the new ribbon cable into the interface board connector.
3M Multimedia Projector MP8620 1-8. Adjustments Interface/Audio Board Synchronization The interface board or the audio board must be in sync. If either one or both are changed, complete the synchronization procedure. 1. Remove the power supply board using the procedure listed in the Disassembly/Reassembly section. 2. Remove the cooling fan and bracket by removing the two screws. 3. Remove three additional screws on the power supply base plate. 4.
3M Multimedia Projector MP8620 1-9. Adjustments Lamp Alignment A poorly aligned lamp can reduce the brightness or the uniformity of the projection image. To ensure that the projector is producing the best possible image lamp alignment should be checked regularly. 1-9-1. Check the Lamp Alignment 1. With the projector off, remove the lamp assembly using the procedure listed in the Disassembly/Reassembly section. 2.
3M Multimedia Projector MP8620 Adjustments 1-9-2. Align the Lamp 1. With the projector off, adjust the lamp up or down by turning the two adjustment screws mounted on springs under the lamp socket. Note If the arcs are too close, the lumen output will be reduced. If the arcs are to far apart the image uniformity will be affected. 2. Verify the lamp alignment by powering up the projector and viewing the image of the lamp on the screen by holding a triplet lens in front of the projector lens. 3.
3M Multimedia Projector MP8620 Adjustments 1-10. Timer Information A lamp life indicator is located under the Option sub-menu. If the indicator bar for the sub-menu item Lamp is Green the lamp is good. When the bar turns red or the projection image appears dark, the lamp and air filter should be replaced. 1-10-1. Reset the Lamp Life Indicator 1. Under the Option sub-menu select the sub-menu item Lamp and press Enter. 4. Follow the instructions in the Help Window. 5.
3M Multimedia Projector MP8620 Adjustments 1-11. Image Adjustments 1-11-1. Adjusting the display resolution and brightness and contrast. 1. Display the PC (RGB) input device projection image. 6. Boot up Microsoft Windows. Go to Control Panel and adjust the desktop background to an even black-andwhite raster. Or, display a projection image with black and white colors. 7. Press the Menu button on the projector to display the main menu. 8.
3M Multimedia Projector MP8620 Adjustments 1-11-2. Part 2 – Adjusting the tracking to remove vertical bands in the projection image. 1. Test the tracking using a MS Excel spreadsheet projection image or equivalent. If vertical interference can be seen, then the tracking needs adjustment. 2. Press the Menu button on the projector to display the main menu. 3. Press the up/down Arrow buttons on the projector or move the Control Stick on the remote control up/down to highlight the Setup sub-menu. 4.
3M Multimedia Projector MP8620 Adjustments 1-11-3. Part 3 – Adjusting the Sync pixel frequency and scanning frequency. This adjustment removes any “fuzziness or flicker” in the projection image. 1. Press the Menu button on the projector to display the main menu. 2. Press the up/down Arrow buttons on the projector or move the Control Stick on the remote control up/down to highlight the Setup sub-menu. 3. Press the Enter button to select the Setup sub-menu 4.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2. Disassembly/Reassembly 2-1. Overview Disassembly and reassembly of the MP8620 is done using the reference photographs and the step-by-step procedures that follow. Many component disassembly steps build upon previous disassembly steps. Refer to the previous disassembly steps as needed. For general machine operation instructions including air filter or lamp replacement, refer to the Operator’s Guide.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-1. Remove Top Cover ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. 1. Lift the two cover latches & lift the cover into the projection position. 1 2 2. Carefully pry off two (2) cover hinges. 4 3.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-2. Remove EMI Shield ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Remove top cover. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. 2 1 1. Remove two (2) screws. 2. Lift EMI shield up to remove. 3. Reassemble in reverse order.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-3. Remove Lamp Assembly ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. 2 1. Remove two (2) screws from bottom of base. 2. Depress lock tab and slide cover to remove. 1 3 3.
3M Multimedia Projector MP8620 Disassembly/Reassembly 8 7. Remove two (2) screws securing lamp housing cover. 7 8. Lift the front of the lamp housing cover up then slide it forward to remove. 11 9. Remove the IR filter. Notice the position of the filter for reassembly. The fins point downward and out. 10 9 10. Remove light shield by pulling it up and out. 11. Disconnect two (2) wire connectors from the thermostat. 12 12. Loosen two (2) screws on the white lamp leads and carefully disconnect wires.
3M Multimedia Projector MP8620 14. Feed lamp wire leads through front of lamp housing. 15. Remove four (4) Torx head screws to free lamp assembly. Carefully lift lamp assembly out of projector body. Disassembly/Reassembly 14 15 15 16. Reassemble in reverse order.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-4. Remove Power Supply ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. Remove the EMI shield. 1. Remove the lamp wire leads from the power supply board at the fan end. These leads connect to the lamp ignitor. 1 2.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-5. Remove Power Distributor ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. 2 Remove lamp assembly and power supply. 1. Remove three (3) screws securing cover. 2.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-6. Remove LCD Assembly ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. Remove the lamp and the power supply. 2 1. Remove three (3) screws securing cover. 2. Lift edge of cover toward front of machine first and then remove.
3M Multimedia Projector MP8620 7. Remove two (2) screws from right side LCD assembly pivot bracket. Disassembly/Reassembly 9 8. Remove one (1) e-ring. 9. Remove LCD assembly. 10. Reassemble in reverse order.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-7. Remove Lens ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. ! Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. Remove the top cover. 1. Remove four (4) screws (two on each side) to release the lens. 2. Reassemble in reverse order.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-8. Remove Audio Speakers ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. ! Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. Remove the lamp assembly and power supply. 2 1. Remove three (3) screws securing cover. 2.
3M Multimedia Projector MP8620 Disassembly/Reassembly 2-3-9. Remove IR Receiver Board ! ! WARNING To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components. Caution To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly. Remove the top cover. 1. Disconnect one (1) cable connector. 2. Remove one (1) screw from IR receiver board. 2 3. Remove IR receiver board. 4.
3M Multimedia Projector MP8620 Troubleshooting 3. Troubleshooting 3-1. Overview Troubleshooting is necessary to isolate problems with the MP8620. This section contains troubleshooting flow charts and a general problems section. 3-2. Section Contents Direct Failure Troubleshooting Flow Charts General/Projection Image Troubleshooting 3-3. Direct Failure Troubleshooting Flow Charts The troubleshooting flow charts listed in this section start with the basics and move forward.
3M Multimedia Projector MP8620 Troubleshooting 3-3-1. Projector Does Not Power Up Projector Does Not Power Up Yes Is the lamp access door closed completely? No Close the lamp access door. Yes Is the LCD in the projection position? No Close top cover, reopen completely. Yes Is the LCD switch fully engaged? No Adjust switch position, replace switch if faulty. Yes Is the fuse on the power supply functioning properly? No Replace fuse.
3M Multimedia Projector MP8620 Troubleshooting 3-3-2.
3M Multimedia Projector MP8620 Troubleshooting 3-3-3.
3M Multimedia Projector MP8620 Troubleshooting 3-3-4. LCD Not Functioning LCD Not Functioning? Yes Does the menu screen appear when the projector is powered on? No Refer to "Projector Does Not Power Up". Yes Does the input device send the video signal properly? No Check input device and cabling. Yes Is the LCD cable properly functioning? No Replace pinched or broken ribbon cables. Yes Is the interface board powering the LCD? Yes No Check connections. Replace interface board if needed.
3M Multimedia Projector MP8620 Troubleshooting 3-3-5. No Sound No Sound? Yes Is the audio input device connected properly? No Check input device cabling and input device. Yes Is the speaker in good physical condition? No Yes Are the speaker wires connected and functioning? Replace speaker. No Reconnect, repair, or replace wires as needed. Yes Is the audio board receiving power from the power supply? Yes No Check connections and cabling. Replace the audio board.
3M Multimedia Projector MP8620 3-4. Troubleshooting General/Projection Image Troubleshooting Past experience has shown the following problems are most common: 3-4-1. Image is Disturbed or Unstable Probable causes are: Wrong sync setting Wrong tracking value Possible solutions are: Set to factory default setting (refer to Appendix C-2). Change Sync setting in the Setup menu for optimum performance.
3M Multimedia Projector MP8620 Troubleshooting 3-4-4. Mouse Does Not Work Probable causes are: Loose cable. Wrong connection. Wrong power up sequence. Possible solutions are: The mouse emulation operates correctly only if the correct power up sequence has been used. 3-4-5. Image Off Center Probable causes are: Image position Center image with the arrow keys of the control panel or the disc pad on the remote control.
3M Multimedia Projector MP8620 Troubleshooting 3-4-8. Humming Noise. Slowly Passing Horizontal Bars Probable causes are: Signal sources are connected to different power sources. VCR connected to aerial system and to projector. Bad signal. Possible solutions are: Locate the source of disturbance. Disconnect the sources one after another from the projector. Connect all sources to a common power source. Remove antenna connection from VCR.
3M Multimedia Projector MP8620 Theory and Diagrams 4. Theory and Diagrams 4-1. Overview In order to truly understand what is taking place when making advanced projector adjustments, the following concepts must be introduced and explained. An understanding of these principles increases your efficiency when making advanced projector adjustments. The diagrams in this section assist you in finding the pin locations, connectors and wiring during troubleshooting. 4-2.
3M Multimedia Projector MP8620 Theory and Diagrams 4-2-3. RGB Input and AD Conversion There are two sets of RGB inputs. Switching between them is done using the input button on the top of the projector or the RGB1/2 button on the remote control. Signal Board The RGB signal goes through a RGB1/2 signal selector then the chroma signal (C) information is sent to the video/RGB selector and the luminal signal (Y) information is sent to sync selection.
3M Multimedia Projector MP8620 4-3. Theory and Diagrams Color Theory An understanding of color theory provides a background for making the convergence and white balance adjustments discussed in Section 6. 4-3-1. Color Color is a visual sensation that involves three elements— a light source, an object, and a viewer. Light is reflected and modified by an object, then reaches the receptors in our eyes and is interpreted by our brains into what we know as color.
3M Multimedia Projector MP8620 4-4. Theory and Diagrams LCD Structure Theory An understanding of LCD Structure theory provides a background for making the convergence adjustments discussed in section 6. LCD is the acronym for Liquid Crystal Display. The three LCD panels (Red, Green, Blue) in the MP8610 are a 1.3” square, poly-silicon design. Each LCD panel is composed of a layer of liquid crystal cells, electrodes, and glass. 4-4-1.
3M Multimedia Projector MP8620 4-5. Theory and Diagrams Lamp Theory The MP8620 with a DC 400 watt metal halide bulb is capable of producing 450+ lumens of uniform brightness across the entire projection image. The metal halide bulbs should never be touched. When oil from your skin touches the bulb, it provides a focal point for the lamp energy. The lamp burns hotter at that location and eventually burns through the bulb prematurely.
3M Multimedia Projector MP8620 4-6. Theory and Diagrams Keystone Correction A correct projection image on the MP8620 should be square and in focus. A projection image that is wider at the top and has a softened focus has keystoning. Keystoning is visible on the MP8620 when the projection to screen angle is greater than sixteen degrees. As the front of the projector is raised the projection angle increases.
3M Multimedia Projector MP8620 4-7. Theory and Diagrams Optical System Layout Notice that the optics module is composed of a lamp, a fresnel lens, and an LCD panel. Condenser Lens Cold Mirror IR and UV Light Lamp Lamp Reflector Hot Mirror Lamp Side Fresnel Lens Side Fresnel Lens LCD IR Light UV Light Polarizer 3M 1999 Lamp Projects light. Fresnel Lens Magnifies the projection image.
3M Multimedia Projector MP8620 4-8. Theory and Diagrams Connection Diagrams Electrical diagrams provide a visual representation of how the projector circuitry is connected.
3M Multimedia Projector MP8620 4-9. Theory and Diagrams Wiring Diagrams Wiring diagrams provide a visual representation of how the projector is wired.
3M Multimedia Projector MP8620 Theory and Diagrams 4-10. Internal Cabling Pinout Tables The pinout tables listed in this section are designed to assists in solving internal cable failure problems. 4-10-1. Interface Board Connector Locations Power Supply Connector (J10) Pin 1 of the connector is the black cable and pin 10 of the connector is the red cable.
3M Multimedia Projector MP8620 Theory and Diagrams 4-10-2. Audio Board Connector Locations Video Out (J1) This connector joins the audio and interface boards. Video In (J2) Allows for video input from the interface board to the audio board.
3M Multimedia Projector MP8620 Theory and Diagrams 4-11. Computer/Video/Audio Connections The information provided in this section is for reference purposes. Each type of cable is shown with a pinout diagram.
3M Multimedia Projector MP8620 3M 1999 Theory and Diagrams 4-13
Important Notice All statements, technical information, and recommendations related to 3M’s products are based on information believed to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated with such use.
