3M MP8620 Service Manual
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3M MP8620 Service Manual

3M MP8620 Service Manual

3m multimedia projector mp8620 service manual
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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. A

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  • Page 1: Service Manual

    MP8620 Multimedia Projector Service Manual 3M Visual Systems Division Printed in U.S.A. 6801 River Place Boulevard ©3M 6/99 78-6970-8988-2 Rev. A Austin, Texas 78726-9000...

  • Page 2: Table Of Contents

    3M Multimedia Projector MP8620 Table of Contents MP8620 Table of Contents 1. Adjustments ..............................1-1 1-1. Overview ............................1-1 1-2. Static Control .............................1-1 1-2-1. Static-Safe Work Environment .....................1-1 1-3. Machine Identification ........................1-1 1-4. Technician Tools ..........................1-2 1-5. Return to Default Settings ........................1-3 1-6.
  • Page 3 3M Multimedia Projector MP8620 Table of Contents 3-4. 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 ....................3-7 3-4-4. Mouse Does Not Work......................3-8 3-4-5. Image Off Center........................3-8 3-4-6. Cannot Get Entire Image on the Screen ................3-8...

  • Page 4: Adjustments

    Static Control The circuit boards in the MP8620 are very sensitive to static energy. A simple static charge can ruin a circuit board instantly. Because of this, it is essential that you complete all repairs in a static-safe work environment.

  • Page 5: Technician Tools

    Backlight Light Source: Used to check the disassembled LCD unit without the original machine lamp source. Voltmeter: Used to measure the voltage at particular test points. 3M recommends the Fluke™ model 87 Oscilloscope (100 MHz): Used to check the video signals horizontal and vertical synchronization and the video board clock.

  • Page 6: Return To Default Settings

    3M Multimedia Projector MP8620 Adjustments 1-5. 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.

  • Page 7: Cleaning The Lcd Panel

    3. Use a dust blower or compressed air to blow air on the LCD panel. Do not exceed 40 PSI. 4. If dust is still visible wipe the LCD panel with a chamois swab or a lint-free cloth from the 3M LCD cleaning kit.

  • Page 8: Lcd Panel Alignment

    3M Multimedia Projector MP8620 Adjustments 1-7. 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.

  • Page 9: Lcd Ribbon Cable Installation

    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.

  • Page 10: Interface/Audio Board Synchronization

    3M Multimedia Projector MP8620 Adjustments 1-8. 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.

  • Page 11: Lamp Alignment

    3M Multimedia Projector MP8620 Adjustments 1-9. 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.

  • Page 12: Align The Lamp

    3M Multimedia Projector MP8620 Adjustments Align the Lamp 1-9-2. 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.

  • Page 13: Timer Information

    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.

  • Page 14: Image Adjustments

    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-and- white raster.

  • Page 15: Part 2 - Adjusting The Tracking To Remove Vertical Bands In The Projection Image

    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.

  • Page 16: Part 3 - Adjusting The Sync Pixel Frequency And Scanning Frequency

    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.

  • Page 17: 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.

  • Page 18: Remove Top Cover

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-1. Remove Top Cover WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 19: Remove Emi Shield

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-2. Remove EMI Shield WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 20: Remove Lamp Assembly

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-3. Remove Lamp Assembly WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.
  • Page 21 Multimedia Projector MP8620 Disassembly/Reassembly 7. Remove two (2) screws securing lamp housing cover. 8. Lift the front of the lamp housing cover up then slide it forward to remove. 9. Remove the IR filter. Notice the position of the filter for reassembly.
  • Page 22 Multimedia Projector MP8620 Disassembly/Reassembly 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. 16. Reassemble in reverse order. 3M 1999...

  • Page 23: Remove Power Supply

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-4. Remove Power Supply WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 24: Remove Power Distributor

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-5. Remove Power Distributor WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 25: Remove Lcd Assembly

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-6. Remove LCD Assembly WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.
  • Page 26 Multimedia Projector MP8620 Disassembly/Reassembly 7. Remove two (2) screws from right side LCD assembly pivot bracket. 8. Remove one (1) e-ring. 9. Remove LCD assembly. 10. Reassemble in reverse order. 3M 1999 2-10...

  • Page 27: Remove Lens

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-7. Remove Lens WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 28: Remove Audio Speakers

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-8. Remove Audio Speakers WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 29: Remove Ir Receiver Board

    Multimedia Projector MP8620 Disassembly/Reassembly 2-3-9. Remove IR Receiver Board WARNING Caution To avoid electrical shocks, unplug projector To avoid burns to fingers, allow projector lamp power cord before performing any maintenance and internal projector components to cool off prior to electrical components.

  • Page 30: Troubleshooting

    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.
  • Page 31 3M Multimedia Projector MP8620 Troubleshooting 3-3-1. Projector Does Not Power Up Projector Does Not Power Up Is the lamp access door closed completely? Close the lamp access door. Is the LCD in the projection position? Close top cover, reopen completely.

  • Page 32: Lamp Does Not Light

    3M Multimedia Projector MP8620 Troubleshooting 3-3-2. Lamp Does Not Light 3M 1999...

  • Page 33: Projector Image Problem

    3M Multimedia Projector MP8620 Troubleshooting 3-3-3. Projector Image Problem 3M 1999...

  • Page 34: Lcd Not Functioning

    3M Multimedia Projector MP8620 Troubleshooting 3-3-4. LCD Not Functioning LCD Not Functioning? Does the menu screen appear when the projector is powered on? Refer to "Projector Does Not Power Up". Does the input device send the video signal properly? Check input device and cabling.

  • Page 35: No Sound

    3M Multimedia Projector MP8620 Troubleshooting 3-3-5. No Sound No Sound? Is the audio input device connected properly? Check input device cabling and input device. Is the speaker in good physical condition? Replace speaker. Are the speaker wires connected and functioning?

  • Page 36: General/Projection Image Troubleshooting

    3M Multimedia Projector MP8620 Troubleshooting 3-4. 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).

  • Page 37: Mouse Does Not Work

    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...

  • Page 38: Humming Noise. Slowly Passing Horizontal Bars

    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.

  • Page 39: Theory And Diagrams

    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.

  • Page 40: Rgb Input And Ad Conversion

    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.

  • Page 41: Color Theory

    3M Multimedia Projector MP8620 Theory and Diagrams 4-3. 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—...

  • Page 42: Lcd Structure Theory

    3M Multimedia Projector MP8620 Theory and Diagrams 4-4. 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”...

  • Page 43: Lamp Theory

    4-5. 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.

  • Page 44: Keystone Correction

    The MP8620 is keystone corrected at a ratio of 3.9 to 1 to provide a square focused image as shown. Restated, for every 3.9 feet of projection distance the image is raised 1 foot.

  • Page 45: Optical System Layout

    3M Multimedia Projector MP8620 Theory and Diagrams 4-7. Optical System Layout Notice that the optics module is composed of a lamp, a fresnel lens, and an LCD panel. Lamp Side Lens Side Condenser Cold Lens Fresnel Lens Fresnel Mirror IR and...

  • Page 46: Connection Diagrams

    3M Multimedia Projector MP8620 Theory and Diagrams 4-8. Connection Diagrams Electrical diagrams provide a visual representation of how the projector circuitry is connected. 3M 1999...

  • Page 47: Wiring Diagrams

    3M Multimedia Projector MP8620 Theory and Diagrams 4-9. Wiring Diagrams Wiring diagrams provide a visual representation of how the projector is wired. 3M 1999...

  • Page 48: Internal Cabling Pinout Tables

    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.

  • Page 49: Audio Board Connector Locations

    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 1999...

  • Page 50: Computer/Video/Audio Connections

    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 1999 4-12...
  • Page 51 3M Multimedia Projector MP8620 Theory and Diagrams 3M 1999 4-13...
  • Page 52 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. Any statements related to the product which are not contained in 3M’s current publications, or any contrary statements contained on your purchase order shall have no force or effect unless expressly set forth in a written agreement signed by an authorized officer of 3M.

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