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MP8610 Multimedia Projector Service Manual

3M Visual Systems Division 6801 River Place Boulevard Austin, Texas 78726-9000

Printed in U.S.A. 3M 5/99 78-6970-8987-4 Rev. A

3MTM Multimedia Projector MP8610 8610 Table of Contents
SECTION 1. ADJUSTMENTS 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9

MP8610 Table of Contents

Overview............................................................................................................................................... 1-1 Static Control ....................................................................................................................................... 1-1 Machine Identification ........................................................................................................................... 1-1 Technician Tools ................................................................................................................................... 1-2 Return to Default Settings...................................................................................................................... 1-3 Keep the LCD Panel Clean .................................................................................................................... 1-4 Interface/Audio Board Synchronization ................................................................................................. 1-6 Lamp Alignment.................................................................................................................................... 1-7 Lamp Timer Information ....................................................................................................................... 1-9

1.10 Image Adustments ............................................................................................................................... 1-10

SECTION 2. DISASSEMBLY/REASSEMBLY 2.1 2.2 2.3 Overview............................................................................................................................................... 2-1 Required Tools ...................................................................................................................................... 2-1 Steps for Removing Projector Components............................................................................................ 2-1 2.3.1 Remove Lens Cover...................................................................................................................... 2-2 2.3.2 Remove Top Cover....................................................................................................................... 2.3 2.3.3 Remove Fan & Plenum................................................................................................................. 2-4 2.3.4 Remove Lamp Assembly .............................................................................................................. 2.5 2.3.5 Remove Power Supply.................................................................................................................. 2-6 2.3.6 Remove Interface Housing Assembly............................................................................................ 2.7 2.3.7 Remove LCD Assembly ............................................................................................................... 2-9 2.3.8 Remove Fresnel Lens & Polarization Filter................................................................................. 2-11 2.3.9 Remove IR Receiver Board......................................................................................................... 2-12

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3MTM Multimedia Projector MP8610
SECTION 3. TROUBLESHOOTING 3.1 3.2

MP8610 Table of Contents

Overview............................................................................................................................................... 3-1 Direct Failure Troubleshooting Flow Charts .......................................................................................... 3-1 3.2.1 Projector Does Not Power Up ....................................................................................................... 3-2 3.2.2 Lamp Does Not Light ................................................................................................................... 3-3 3.2.3 Projector Image Problem............................................................................................................... 3-4 3-2.4 LCD Not Functioning................................................................................................................... 3-5 3-2-5 No Sound ..................................................................................................................................... 3-6

3.3

General/Projection Image Troubleshooting ............................................................................................ 3-7 3.3.1 Image is Disturbed or Unstable ..................................................................................................... 3-7 3.3.2 No Computer Image Projected ...................................................................................................... 3-7 3.3.3 No Video Image Projected ............................................................................................................ 3-7 3.3.4 Mouse Does Not Work ................................................................................................................. 3-8 3.3.5 Image Off Center .......................................................................................................................... 3-8 3.3.6 Cannot Get Entire Image on the Screen......................................................................................... 3-8 3.3.7 Washed Out Image........................................................................................................................ 3-8 3.3.8 Humming Noise. Slowly Passing Horizontal Bars........................................................................ 3-9 3.3.9 No Power. Power Shuts Off During Presentation .......................................................................... 3-9

SECTION 4. THEORY AND DIAGRAMS 4.1 4.2 4.3 4.4 4.5 4.6 4-7 4.8 4.9 Overview............................................................................................................................................... 4-1 Section Contents.................................................................................................................................... 4-1 Theory of Operation .............................................................................................................................. 4-1 Color Theory ......................................................................................................................................... 4-2 LCD Structure Theory ........................................................................................................................... 4-3 Lamp Theory ......................................................................................................................................... 4-4 Keystone Correction ............................................................................................................................. 4-5 Optical System Layout .......................................................................................................................... 4-6 Connection Diagrams ............................................................................................................................ 4-7

4.10 Wiring Diagrams ................................................................................................................................... 4-8 4-11 Internal Cabling Pinout Tables............................................................................................................... 4-9 4-12 Computer/Video/Audio Connections ................................................................................................... 4-11

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3MTM Multimedia Projector MP8610
1. Adjustments 1-1. Overview

Adjustments

Make advanced adjustments to the MP8610 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.
Important Note

Important: Complete advanced adjustments to a projector only when the machine settings fall outside of the allowable tolerances for that adjustment, or when instructed to do so by another procedure.

1-2.

Static Control

The circuit boards in the MP8610 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.

1-2-1. Static-Safe Work Environment
A properly grounded floor mat, table mat and adjustable wrist strap with grounding cord are needed for complete static protection. 3M recommends any of the following workstation grounding kits:


3MTM Workstation Grounding Kit Model 8011 3MTM Workstation Grounding Kit Series 8020 3MTM Workstation Grounding Kit Series 8030

For your nearest distributor or to order, call 1-800-328-1368.

1-3.

Machine Identification

To avoid incorrect adjustments, verify the model and version of the projector prior to making any adjustments. Different versions have unique adjustment requirements. The serial number for MP8610 is located on the back of the projector.

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3MTM Multimedia Projector MP8610
1-4. Technician Tools

Adjustments

Test Generator: 3M recommends the Quantum DataTM 801GX Video Test Generator (shown to right) or ExtronTM 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. LCD Alignment Tool: Used to check that the LCD alignment is at an 8 degree angle. 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 FlukeTM model 87 Oscilloscope (100 MHz): Used to check the video signals horizontal and vertical synchronization and the video board clock. Torx Drivers: Use to remove mounting bolts. White Silk Gloves: Used to keep skin oils away from the lamp and LCD panel.

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3MTM Multimedia Projector MP8610
1-5. Return to Default Settings

Adjustments

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.

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1-6. Keep the LCD Panel Clean

Adjustments

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 MP8610. 4. Use the video test generator to input the color White with a timing signal set to SVGA VESA (60).

The voltage settings for each input color need to be programmed into the video test generator. Refer to the video test generator user's guide for further assistance. 5. Turn the main power switch to the on position. 6. Look for dust particles on the projection image. Remove any dust from the outside of the projection lens with a lint-free cloth. If dust remains on the projection image, the LCD panel needs to be cleaned.

1-6-2. Cleaning the Dust from LCD
If dust particles can be seen on your projection image: 1. Turn off the main power switch of the projector and unplug the power cord. 2. Remove the LCD module assembly. (Refer to the appropriate Disassembly/Reassembly procedures). 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. Use extreme care when cleaning any optics device. Special gelatin coatings can be scratched very easily. 5. Use a lighted magnifier with a black background to check for streaks. 6. Replace the LCD panel, reassemble the projector and recheck the projection image for dust by projecting a blank white image. 7. If dust still remains complete steps 1-6 again. If dust is gone, complete a LCD panel alignment.

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3MTM Multimedia Projector MP8610
1-6-3. Install LCD Ribbon Cable
Installing a new LCD ribbon cable is done using the following steps:

Adjustments

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. The blue side of the cable should be facing down. 4. Lock the white plastic clamps into place on both the LCD connector and the interface board connector. 5. Use the old cable as a pattern to place the appropriate bends in the new cable. If a connector clamp is broken: 1. Order a complete connector (DY-0205-1512-7). 2. Remove the plastic portion from the new connector and replace the broken part. 3. If the connector can not be repaired in this way, the LCD or interface board may need to be replaced.

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3MTM Multimedia Projector MP8610
1-7. Interface/Audio Board Synchronization

Adjustments

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. Tip up the base plate toward the lamp housing to remove it.
Cooling fan bracket Power supply board

Cooling fan Power supply base

5. Reconnect the power supply to the machine with the 3-pin connector, or reconnect the external power supply (DY-0205-1509-3) to the machine with the 3-pin connector. 6. Connect the interface board to the power board with the Service Interface Cable (DY-205-1500-1). 7. Place a cover over the power supply board to prevent damage or injury. Because the power supply board is fully energized in the next step, it is essential that a cover is placed over the board to prevent injury. 8. Power up the projector. 9. Measure the voltage of pin 9 on the test block. This connector is nearest the EPROM. Pin 1 is closest to the EPROM. The voltage should be 3.4 Volts .01. 10. If the voltage reading of pin 9 on the test block is outside the allowable tolerance, adjust the trim potentiometer located in a small hole in the audio board until the voltage reading is within tolerance. 11. When finished with the adjustment, reassemble the projector. Use extra care when replacing the power supply base plate, the LCD cable can be damaged very easily.
Label PCB Trim
3.4 Volts 0.1

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3MTM Multimedia Projector MP8610
1-8. Lamp Alignment

Adjustments

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.

1-8-1. Check the Lamp Alignment
1. With the projector off, remove the lamp assembly using the procedure listed in the Disassembly/Reassembly section. 2. Hold the lamp assembly and look through the condenser at an angle perpendicular to the condenser lens. 3. The lamp should be aligned using the reflection image on the lamp reflector. The image of the lamp should be slightly above or slightly below the lamp. 4. If not, this position can be changed by turning the two adjustment screws below the lamp sockets. 5. Verify the lamp alignment by powering up the projector and viewing the image of the lamp on the screen. This can be done by holding a triplet lens in front of the projector lens .
ReflectedLamp alignment - dotted line is image of lamp. figure 3. image of lamp slightly below

Triplet lens

6. Visually check to make sure the image of the lamp arc is positioned correctly:
Correct lamp alignment: Image of reflected arc Image of arc

Incorrect lamp alignment:

Imagehofdarc n b y a r c i d e la m p hidden by lamp

b .

I m

a g e

o f

c . m ImagesIaof caa gr e dt o o a f m p arcs r a n l c f a r apart r t . too far a p a

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3MTM Multimedia Projector MP8610

Adjustments

1-8-2. 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. 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. Repeat the above two steps until the lamp is aligned correctly.

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3MTM Multimedia Projector MP8610
1-9. Lamp Timer Information

Adjustments

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.

1-9-1. Reset the Lamp Timer
1. Under the Option sub-menu select the sub-menu item Lamp and press Enter. 4. Follow the instructions in the Help Window. 5. Press the Enter button and the Up Arrow button on the control panel for confirmation.

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3MTM Multimedia Projector MP8610
1-10. Image Adjustments 1-10-1. Adjusting the display resolution and brightness and contrast.
1. Display the PC (RGB) input device projection image.

Adjustments

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. Press the up/down Arrow buttons on the projector or the Control Stick on the remote control up/down to highlight the Setup sub-menu. 9. Press the Enter button to select the Setup sub-menu. The current display resolution is displayed in the title block of the Setup menu. For example 640 x 480. Change the display resolution if desired. 10. Confirm your selection by pressing the Enter button. 11. Press the up/down Arrow buttons on the projector or move the Control Stick on the remote control to select the Palette sub-menu item. 12. Press the left/right Arrow buttons on the projector or the Control Stick on the remote control left/right to reduce the chromatic resolution from the default that is 16.7 million colors to 64. 13. Press the up/down Arrow buttons on the projector or move the Control Stick on the remote control to select the Pixels sub-menu item. 14. Press the left/right Arrow buttons on the projector or move the Control Stick on the remote control left/right to increase or decrease the number of pixels in the display. Select 800 x 600. 15. Select the menu item Brightness and correct the setting so that white areas are projected with maximum intensity. 16. Select the menu item Contrast and correct the setting so that the gray areas are clearly visible. 17. Press the Menu button to exit the sub-menu and return to the main menu. 18. A message will display in the help window asking you to confirm the changes made in the sub-menu. Press Enter to confirm. 19. Press the Menu button to exit the main menu display and return to the projected image.

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3MTM Multimedia Projector MP8610
1-10-2. Adjusting the tracking to remove vertical bands in the projection image.

Adjustments

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. Press the Enter button to select the Setup sub-menu. 5. Press the up/down Arrow buttons on the projector or move the Control Stick on the remote control to select the Tracking sub-menu item. 6. Press the left/right Arrow buttons on the projector or move the Control Stick on the remote control left/right to reduce the amount of interference.

7. The direction of adjustment is correct when the number of lines decreases. The setting is optimal when no interference lines can be seen. 8. Press the Menu button to exit the sub-menu and return to the main menu. 9. A message will display in the help window asking you to confirm the changes made in the sub-menu. Press Enter to confirm. An automatic setting of tracking can be called up by pressing the Enter button. This may not work if the projection image is a uniform pattern.

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3MTM Multimedia Projector MP8610
1-10-3. 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.

Adjustments

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. Confirm your selection by pressing the Enter button. 5. Press the up/down Arrow buttons on the projector or move the Control Stick on the remote control to select the Sync sub-menu item. 6. Press the left/right Arrow buttons on the projector or move the Control Stick on the remote control left/right to reduce the amount of " fuzziness or flicker" in the projection image.

Before

After

An automatic setting of synchronization can be called up by pressing the Enter button. 7. Complete fine adjustments to the brightness and contrast settings if minor interference still remains. Press the Menu button to exit the sub-menu and return to the main menu. 8. Complete fine adjustments to the brightness and contrast settings if minor interference still remains. 9. Press the Menu button to exit the sub-menu and return to the main menu. 10. A message will display in the help window asking you to confirm the changes made in the sub-menu. Press Enter to confirm. 11. Press the Menu button to exit the main menu display and return to the projected image.

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3MTM Multimedia Projector MP8610 2. Disassembly/Reassembly
2-1. Overview

Disassembly/Reassembly

Disassembly and reassembly of the MP8610 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.
!

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.

2-2.


Required Tools
Phillips screwdriver (#1 magnetic long shaft) Standard screwdriver (3/16 in. or in. blade) T-15 Torx Driver T-20 Torx Driver E-ring Remover

An entire disassembly and reassembly can be completed with the following tools:

2-3.


Steps for Removing Projector Components


Removal topics include: Lens Cover Top Cover Fan and Plenum Lamp Assembly Power Supply Interface Housing Assembly LCD Assembly Fresnel and Polarization Filter IR Receiver Board

Note
If performing a complete disassembly, record lamp time.

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3MTM Multimedia Projector MP8610
2-3-1. Remove Lens Cover
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

1 1. Remove two (2) screws from the bottom of projector. 2. Remove the lens cap. 3. Slide the lens housing forward to remove. 4. Reassemble in reverse order. 3

2

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3MTM Multimedia Projector MP8610
2-3-2. Remove Top Cover
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover.

1 3

1. Remove two (2) screws from the top cover. 2. Lower the carrying handle for screw access. 3. Remove two (2) screws.

2

4. Pry out the small cap from the top cover hinge assembly. 5. Loosen the hinge screw 2 full revolutions.

5

4

6. Pull out the hinge assembly while pushing against the loosened hinge screw. 7. Repeat steps 4, 5, 6 for the top cover hinge assembly on the other side of the projector. 8. Remove the top cover. 9. Reassemble in reverse order.

6

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3MTM Multimedia Projector MP8610
2-3-3. Remove Fan and Plenum
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover and top cover.

1. Disconnect the fan connector.

1

2. Remove two (2) screws securing the temperature sensor. 3. Remove the screws for the fan/plenum: A. To remove the lamp cooling fan only: Remove the screws shown as 3A [two (2) per side]. B. To remove the fan plenum: Remove the fan screws shown as 3A, and the plenum screws, shown as 3B [two (2) per side]. 4. Slide the assembly back and lift up to remove. 5. Reassemble in reverse order. 3B 4 2

3A

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3MTM Multimedia Projector MP8610
2-3-4. Remove Lamp Assembly
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover, top cover, and fan plenum.

Note
Use gloves when handling optical components to prevent finger printing.

1

2

1. Remove two (2) screws from the lamp housing cover and remove cover. [Lamp cover is already removed in photo]. 2. Remove the two (2) light shields by pulling them up and out of the lamp assembly. 3. Remove two (2) connectors from the power supply. 4. Remove the ground wire. 4 3

5. Remove four (4) torx head screws from the lamp housing assembly base. 6. Lift the wire harness to gain access to the assembly. 7. Lift up and remove the lamp housing assembly. 8. Reassemble in reverse order.

7

5

6

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3MTM Multimedia Projector MP8610
2-3-5. Remove Power Supply
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover, top cover, and fan plenum.

1. Remove two (2) lamp leads from the power supply board at the fan end.

1

2. Disconnect three (3) fan connectors [in a block] at the end opposite the cooling fan.

Note
The three fan cables are parallel connected, and do not need to be placed back into the exact same connector.

3

3. Disconnect the 10-pin PCB interface connector. 4. Disconnect two (2) ground cables attached to the PCB heat sink. 5. Remove the 3-pin power connector.

2

4 5

6. Remove three (3) philips screws. 7. Remove the power supply. 8. Reassemble in reverse order. 7 6

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2-3-6. Remove Interface Housing Assembly
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover, top cover, lamp assembly, fan plenum, and power supply.

1

1. Remove two (2) interlocks. 2. Remove three (3) screws from the interface housing assembly cover. 3. Remove the cover. 2 3

4. Disconnect three (3) cable connectors.

4

5. Slide the ribbon cable back and release the connector. [gold tab side up for ribbon cable reassembly]. 6. Remove one (1) screw from the upper right corner of the interface housing assembly.

5

6

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3MTM Multimedia Projector MP8610
7. Disconnect the ribbon cable from the control panel. 8. Remove one (1) screw from the upper left corner of the interface housing assembly. 9. Remove the interface housing assembly. 10. Reassemble in reverse order.

Disassembly/Reassembly

8 7

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3MTM Multimedia Projector MP8610
2-3-7. Remove LCD Assembly
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover, top cover, lamp assembly, fan plenum, and power supply. 1 11. Disconnect the ground connector. 12. Remove three (3) screws from the interface housing assembly cover. 13. Remove the cover. 2 3

14. Disconnect three (3) cable connectors.

4

15. Slide the ribbon cable back and release the connector. [gold tab side up for ribbon cable reassembly].

5

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3MTM Multimedia Projector MP8610
16. Remove two (2) screws from the LCD assembly on the fan assembly side.

Disassembly/Reassembly

6

17. Remove two (2) screws from the other end of the LCD assembly.

7

18. Lift up the LCD assembly and thread the ribbon cable through the ferrit. 19. Remove the LCD assembly. 20. Reassemble in reverse order. 8 9

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3MTM Multimedia Projector MP8610
2-3-8. Remove Fresnel Lens and Polarization Filter
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover and top cover.

1

1. Remove one (1) screw to remove the light cover from the LCD assembly. 2. Remove three (3) screws to remove the LCD bracket from the LCD assembly. 2

Rear

3. Remove the front and rear fresnel lens by pulling straight up. Handle each fresnel lens with extreme care. 4. Lift out the polarization filter. [the glass component between lamp side fresnel lens and LCD].

3

4

Front

3

Note
When installing a new polarization filter, remember to remove the protective film on the filter side, and reinsert the polarization filter with the blackline (coated side) facing the LCD.

5. Reassemble in reverse order.

LDC Assembly

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3MTM Multimedia Projector MP8610
2-3-9. Remove IR Receiver Board
!

Disassembly/Reassembly

WARNING

!

Caution

To avoid electrical shocks, unplug projector power cord before performing any maintenance to electrical components.

To avoid burns to fingers, allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly.

Remove the lens cover and top cover. 1 1. Place a protective cover over the lens. 2. Disconnect two (2) speaker wires. 3. Loosen the nut and thread the setscrew out. 4. Slide the speaker up and remove. [a magnet is holding the speaker to the bracket]. 6 7 3

Note
When reinstalling the speaker, there are two (2) screws on the side of the bracket for speaker alignment.

5

2

4

5. Disconnect the cable to the IR receiver board. 6. Remove one (1) screw. 7. Remove the IR receiver board. 8. Reassemble in reverse order.

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3MTM Multimedia Projector MP8610
3. Troubleshooting 3-1. Overview

Troubleshooting

Troubleshooting is necessary to isolate problems with the MP8610. This section contains troubleshooting flow charts and a general problems section.

3-2.

Direct Failure Troubleshooting Flow Charts

The troubleshooting flow charts listed in this section start with the basics and move forward. They are designed to be used for solving direct failure problems. The following problems can be resolved using the troubleshooting flow charts:


Projector Does Not Power Up Lamp Does Not Light Projection Image Problems LCD Not Functioning No Sound

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3MTM Multimedia Projector MP8610
3-2-1. Projector Does Not Power Up

Troubleshooting

Projector Does Not Power Up

Yes

Is the lamp access door closed completely?

No

Yes Is the LCD in the projection position?

Close the lamp access door.

No

Yes

Close top cover, reopen completely.

Is the LCD switch fully engaged?

No

Yes

Adjust switch position, replace switch if faulty.

Is the fuse on the power supply functioning properly? Yes

No

Replace fuse.

Replace the power supply

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3MTM Multimedia Projector MP8610
3-2-2. Lamp Does Not Light

Troubleshooting

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3MTM Multimedia Projector MP8610
3-2-3. Projector Image Problem

Troubleshooting

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3MTM Multimedia Projector MP8610
3-2-4. LCD Not Functioning

Troubleshooting

LCD Not Functioning?

Yes Does the menu screen appear when the projector is powered on? Yes Does the input device send the video signal properly? Yes Is the LCD cable properly functioning? Yes

No

Refer to "Projector Does Not Power Up". No

Check input device and cabling. No

Replace pinched or broken ribbon cables.

Is the interface board powering the LCD? Yes

No Check connections. Replace interface board if needed.

Replace the LCD unit.

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3MTM Multimedia Projector MP8610
3-2-5. No Sound

Troubleshooting

No Sound?

Yes Is the audio input device connected properly? Yes Is the speaker in good physical condition? Yes

No

Check input device cabling and input device. No

Replace speaker.

Are the speaker wires connected and functioning? Yes

No Reconnect, repair, or replace wires as needed.

Is the audio board receiving power from the power supply? Yes

No

Check connections and cabling.

Replace the audio board.

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3-3. General/Projection Image Troubleshooting

Troubleshooting

Past experience has shown the following problems are most common:

3-3-1. 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. For vertical interference stripes, change the Tracking in the Setup menu for optimum performance.

3-3-2. No Computer Image Projected
Message No input detected is shown. Probable causes are:


Loose cable. No power to computer. Wrong synchronization mode.

Possible solutions are: Check and secure cable connections. Turn on computer. Adjust synchronization mode of the projector to the synchronization mode of the computer via Option menu.

3-3-3. No Video Image Projected
Probable causes are:


No signal from video source. Check and secure cable connections. Check video picture on TV.

Possible solutions are: Check and secure cable connections. For PS/2 and ADB (Apple) mouse, a special adapter is necessary. Only use adapters from the original manufacturer.

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3-3-4. Mouse Does Not Work
Probable causes are:


Troubleshooting

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.

3-3-5. 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. If vertical interference stripes occur, change the Tracking value in the Setup menu for optimum performance.

3-3-6. Cannot Get Entire Image on the Screen
Probable causes are:


Wrong Tracking value. Compatibility problem. Wrong pixel setting.

Possible solutions are: Refer to the documentation of your graphic card. The projector supports the resolutions that can be found under Pixel in the Setup menu. Adjust the Pixel setting in the Setup menu to the resolution of the video mode output from the computer graphic card.

3-3-7. Washed Out Image
Probable causes are:


Wrong Contrast setting. Wrong Brightness setting.

Possible solutions are: Change Contrast setting in the Setup menu. The bar should be in the middle position. Lower Brightness setting in the Setup menu. Choosing Brightness and pressing Enter performs an automatic adjustment.

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3-3-8. Humming Noise. Slowly Passing Horizontal Bars
Probable causes are:



Troubleshooting

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. If the disturbance disappears, use a bypass filter (isolating transformer) to connect the antenna to the VCR. Try different input source.



3-3-9. No Power. Power Shuts Off During Presentation
Probable causes are:


Power switch OFF. Projector overheated.

Possible solutions are: Turn on Power switch to projector. Remove any objects blocking ventilation and allow projector to cool down. Power will return and projector will be in Standby mode.MP8610 Message Table

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4. Theory and Diagrams 4-1. Overview

Theory and Diagrams

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.


Section Contents


Theory of Operation Color Theory LCD Structure Theory Lamp Theory

Optical System Layout Connection Diagrams Wiring Diagrams Internal Cabling Pinout Tables

4-3.

Theory of Operation

Use the projector circuitry diagrams as a reference when reading the topics in this section.

4-3-1. MP8610 Power Supply Circuit
When the main power switch is on and the 110V AC power is supplied, two DC power circuits are energized. The AC power passes through a filter then on to the ballast where the AC voltage changes to DC voltage and is split. High voltage DC current is sent to the lamp where it will have six tries to light. Low voltage DC current is sent to the power unit circuit then to the Micro processor to power the rest of the projector.

4-3-2. MP8610 Video Input and AD Conversion
There are two sets of video inputs. Switching between them is done using the input button on the top of the projector or the Video1/2 button on the remote control. (Y) information passes through the gate array and timing generator. A PLL circuit generates the sampling pulse for the AD converter and is dependent upon the detection of vertical and horizontal sync pulses. The two signals are output though the video amplifier, where the sample/hold and video rotation take place before each LCD receives the appropriate information.

Signal Board
The video signal passes though the video signal selector then to the comb filter where it is split into the chroma signal (C). It is then sent to the RGB/video selector and the luminance (Y) signal is sent to the sync selector.

Driver Board
The signal passes through another selector before the AD converter. The analog signal is changed to a digital signal and passes though the on screen display. The gate array is where a smoothing affect and resizing takes place. The signal is then changed back to analog and sent to the video amplifier/inversion amplifier. The luminance signal

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4-3-3. MP8610 RGB Input and AD Conversion

Theory and Diagrams

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.

Driver Board
Refer to driver board information for video.

RGB Out
RGB out simply takes the information in its analog state and passes it through an amplifier to the terminal out. Additional electronic image smoothing occurs in the gate array of the MP8610.

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4-4. Color Theory

Theory and Diagrams

An understanding of color theory provides a background for making the convergence and white balance adjustments discussed in Section 6.

4-4-1. 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.

Each color has its own measurable wavelength or combination of wavelengths. The wavelengths of light are not colored, but produce the sensation of color.

4-4-2. Electromagnetic Spectrum
All wavelengths of light are part of the electromagnetic energy spectrum. The spectrum is a continuous sequence of energy waves that vary in length from short to long. Visible light, the wavelength that our eyes can detect, is only a small portion of the entire spectrum. At one end of the visible spectrum are the short wavelengths of light we perceive as blue. At the other end of the visible spectrum are the longer wavelengths of light we perceive as red. All other colors are found somewhere along the spectrum between blue and red.

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4-5. LCD Structure Theory

Theory and Diagrams

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.

4-5-1. LCD Cells
Each cell is composed of long, rod shaped molecules that react to an electrical charge. In their normal state, the molecules form a spiral. When an electrical charge is applied, the molecules align themselves allowing the light to pass through the pixels. Shades of gray are obtained by inputting voltages that fall between full off (no voltage) and full on (full voltage). The cells are refreshed at the speed of 1/60th of a second and are sensitive to high temperatures.

4-5-2. How Light Passes Through An LCD
Polarized light entering the cells from the rear is aligned so that it will pass the light through the polarizer on the other side. Patterned transparent electrodes on the inner surfaces of the glass form an addressing system that creates a distinct electric field for each pixel. The light that was not aligned as it passed through the liquid crystal cell is blocked.

4-5-3. Example Projection
If 100% of the red light is emitted through the red LCD panel and 50% of the green light makes it through the green LCD panel and the blue light is blocked entirely, a light brown screen is projected.

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4-6. Lamp Theory

Theory and Diagrams

The MP8610 with a DC 260 watt metal halide bulb is capable of producing 550+ 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.

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4-7. Keystone Correction

Theory and Diagrams

A correct projection image on the MP8610 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 MP8610 when the projection to screen angle is greater than sixteen degrees. As the front of the projector is raised the projection angle increases. At sixteen degrees the projection image is still square and in focus, at nineteen degrees keystoning can be seen. The MP8610 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. This feature allows for 80% of the projection image to appear above the lens center with only 20% appearing below.

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4-8. Optical System Layout

Theory and Diagrams

Notice that the optics module is composed of a lamp, a fresnel lens, and an LCD panel.

Cold Mirror IR and UV Light

Condenser Lens Lamp Hot Mirror

Lamp Side Fresnel LCD

Lens Side Fresnel

Lens

Lamp Reflector

IR Light UV Light Polarizer

Lamp Fresnel Lens Polarizer Hot Mirror Cold Mirror Reflector LCD Panel

Projects light. Magnifies the projection image. Allows light waves, at the right angle, to pass through Heat management device that passes the light and reflects heat, IR and UV light. Heat management device that reflects the light and passes heat, IR and UV light. Positions the liquid crystal cells that form an image.

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4-9. Connection Diagrams

Theory and Diagrams

Electrical diagrams provide a visual representation of how the projector circuitry is connected.

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4-10. Wiring Diagrams
Wiring diagrams provide a visual representation of how the projector is wired.

Theory and Diagrams

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4-11. Internal Cabling Pinout Tables

Theory and Diagrams

The pinout tables listed in this section are designed to assists in solving internal cable failure problems.

4-11-1. 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.

1-2 3 4 5 6-7 8 9 10

5 Volt -5 Volt +12 Volt -12 Volt Ground Lamp on = 5Volt (TTL high) Lamp off = 0 Volt (TTL Low Dimmer Standard = 0 Volt (TTL low) Economy = 5 Volt Fan on= 5Volt (TTL high) Fan off = 0 Volts(TTL low)

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4-11-2. Audio Board Connector Locations

Theory and Diagrams

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.

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4-12. Computer/Video/Audio Connections

Theory and Diagrams

The information provided in this section is for reference purposes. Each type of cable is shown with a pinout diagram

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Theory and Diagrams

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