3M MP8670l User manual

Service Manual

MP8670/8745/8755/8770 Multimedia

Projector

3M Visual Systems Division E. P. S. Service Documentation

Austin, Texas 78726-9000 78-6970-8985-8

Warranty and Limited Remedy.This product will be free from defects in material and manufacture for a period of

two years from the date of purchase. 3M MAKES NO OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY

IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. If this product is defective

within the warranty period stated above, your exclusive remedy shall be, at 3M’s option, to replace or repair the 3M product or

refund the purchase price of the 3M product. _______________________________________________________________

Limitation of Liability. Except where prohibited by law, 3M will not be liable for any loss or damage arising from this

3M product, whether direct, indirect, special, incidental or consequential regardless of the legal theory asserted.

MP8670/8745/8755/8770 Table of Contents

SECTION 1 ADJUSTMENTS

1-1 Adjustments ................................................................................................................................................ 1-1

1-2 Section Contents ......................................................................................................................................... 1-1

1-3 Machine Identification................................................................................................................................ 1-1

1-4 Technical Tools........................................................................................................................................... 1-2

1-5 Cleaning LCD Panels.................................................................................................................................. 1-3

1-6 Convergence................................................................................................................................................ 1-4

1-7 White Balance............................................................................................................................................. 1-6

SECTION 2 DISASSEMBLY/REASSEMBLY

2-1 Overview..................................................................................................................................................... 2-1

2-2 Required Tools............................................................................................................................................ 2-1

2-3 Steps for Removing Projector Components................................................................................................ 2-1

SECTION 3. TROUBLESHOOTING

3-1 Troubleshooting Checkpoints..................................................................................................................... 3-1

3-2 Power Cannot be Turned on Flowchart ...................................................................................................... 3-2

3-3 Lamp Does Not Light Flowchart ................................................................................................................ 3-3

3-4 No Picture – RGB Only Flowchart............................................................................................................. 3-5

3-5 No Picture – Video Only (RGB-Good) Flowchart ..................................................................................... 3-6

3-6 No Picture – RGB or VIDEO Flowchart .................................................................................................... 3-7

3-7 No Sound Flowchart ................................................................................................................................... 3-8

3-8 Cannot Control Mouse or RS232C Flowchart............................................................................................ 3-9

3-9 Cannot Control USB Mouse Flowchart.................................................................................................... 3-10

3-10 Signal Waveforms of P501, P601, and P704............................................................................................ 3-11

SECTION 4 THEORY AND DIAGRAMS

4-1 Theory of Operation.................................................................................................................................... 4-1

4-2 Color Theory............................................................................................................................................... 4-3

4-3 LCD Structure Theory ................................................................................................................................ 4-4

4-4 Lamp Theory............................................................................................................................................... 4-5

4-5 Optical System Layout................................................................................................................................ 4-6

4-6 Block Diagram ............................................................................................................................................ 4-7

4-7 Main PWB Wiring Diagram ....................................................................................................................... 4-8

4-8 Optical Unit Wiring Diagram...................................................................................................................... 4-9

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1. Adjustments

1-1. Overview

Make advanced adjustments to the

MP8670/8745 in a clean environment with

minimal dust and positive pressure. Some

adjustment procedures require a dark room with

a luminance of less than five (Lux). 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.

1-2. Section Contents

•Machine Identification

•Technician Tools

•Cleaning LCD Panels

•Convergence

•White Balance

•Sample/Hold Timing

•MP8670/8745 Verification Test Sheet.

üImportant

Only complete advanced adjustments to a

projector when the machine settings fall outside

of the allowable tolerances for that adjustment

or when instructed to do so by another

procedure.

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

MP8670/8745 is located on the back of the

projector.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1-4. Technician Tools

1-4-1. Test Generator

3M recommends the Quantum Data™ 801GX Video Test

Generator (shown) or Extron™ VTG200 Video Test

Generator be used for all advanced adjustment

procedures. Use for white balance adjustments.

1-4-2. Chroma Meter

3M recommends the Minolta™ CL100 Chroma Meter or equivalent. Use for white balance adjustments.

1-4-3. Phillips Screw Drivers (#1 Magnetic Long Shaft)

Use for component disassembly and reassembly.

1-4-4. Standard Screw Driver (3/16” or 1/4” Blade)

Use for lamp removal and replacement.

1-4-5. Flashlight

Use in dark room during convergence and white balance adjustments.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1-5. Cleaning LCD Panels.

Dust particles can accumulate on the glass covering the LCD panels causing spots on the projection

image. Periodic cleaning is necessary to maintain a high quality projection image.

1-5-1. Test for Dust on the LCD Panels

1. Turn the main power switch to the on

position.

Note: Input needed to access Menu

2. On the remote control:

•Press the Menu button.

•Select the Image menu.

•Select Blank from the Image menu and

change the color to white.

•Press the Menu button to remove the

menu window.

•Press Blank on the remote control

3. Look for dust particles on the projection

image.

4. Remove any dust from the outside of the

projection lens with a lint-free cloth. If dust

remains on the projection image, the LCD’s

and the air filter need to be cleaned.

5. The cleaning procedure that follows

requires removal of the LCD module

assembly. A convergence check must be

completed after cleaning is complete.

1-5-2. Cleaning Dust from LCD’s

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. Use a dust blower or compressed air to blow

air on all three LCD panels. Do not exceed

40 PSI.

3. If dust is still visible wipe the LCD panels

with a chamois swab or a lint-free cloth

from the 3M LCD cleaning kit.

üü Important

Use extreme care when cleaning any optics

device. Special gelatin coatings can be

scratched very easily.

4. Use a lighted magnifier to check for streaks.

If dust still remains complete steps 1-4 again.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1-6. Convergence

The purpose of this procedure is to properly check the Red, Green, and Blue liquid display (LCD) panels

so that the three colors are aligned at the same location and at the center of the screen.

This allows for projection of the color White.

If it is determined that convergence is a problem, the entire LCD assembly must be replaced.

1-6-1. Necessary Tools

•Quantum Data™ 801GX Video Test Generator or equivalent

•MP8670/8745 Remote Control.

1-6-2. Set Up Test Generator

1. Plug in the video test generator to the RGB

terminal jack located on the backside of the

MP8670/8745.

2. Input the SVGA (MP8670) or XGA

(MP8745) VESA (60) cross-hatch timing

signal.

3. 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.

4. Turn on the MP8670/8745, and allow it to

run for 10 minutes. This warms up the LCD

panels.

5. Position the projector so that the projection

image is approximately 70 inches diagonally

with the W-Zoom button on the remote

control set to Max.

6. Press the Menu button on the remote

control, and then use the Reset button to

return the Setup menu controls to the

default settings.

7. Press the Menu button on the remote

control once again, and from the Setup

menu, adjust the H-Phase so that “jitter”

(flicker) is not evident in any of the

horizontal or vertical lines of the crosshatch

pattern. Adjust for the lowest possible value

where “jitter” is not seen (usually 6 or

lower).

8. Adjust the Focus so that the projection

images vertical and horizontal lines of the

crosshatch pattern are crisp and clear.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1-6-3. Convergence Check

Follow these steps to check the Red and Blue LCD panels with the Green panel.

1. Input the SVGA VESA (60) cross-hatch timing signal or equivalent. (MP8670).

Input the XGA VESA (60) cross-hatch timing signal or equivalent. (MP8745).

2. Select red and green and check convergence.

3. Select blue and green and check convergence.

4. Select all three colors and check convergence.

5. If convergence is outside acceptable tolerance, the entire assembly must be replaced. No

convergence adjustment is possible.

Acceptable Tolerance is:

•1 pixel off at center of screen,

•1.25 pixels off at outside edge of screen.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1-7. White Balance

The purpose of this procedure is to adjust the brightness quality of the color white in the projection

image.

1-7-1. Necessary Tools

•Minolta™ CL-100 Chroma meter or equivalent

•Phillips Screwdriver

•Quantum Data™ 801GX Video Test Generator or equivalent

•MP8670/8745 Remote Control

•Dark Room (Less than five Lux ambient light)

•Flashlight.

1-7-2. Preparation for White Balance

Follow these steps to prepare the projector for white balance adjustment.

1. Check the convergence prior to adjusting the white balance. Refer to the previous section for

procedure.

2. Turn on the projector and allow it to run for 10 minutes. This warms up the LCD panels.

3. Position the projector so that the projection image is approximately 70 inches diagonally with the W-

Zoom button on the remote control set to Max.

4. Press the Menu button on the remote control, and then use the Reset button to return the Setup menu

controls to the default settings.

5. Turn off the projector, then plug in the video test generator to the RGB terminal jack.

6. Program the voltage settings for each input color into the video test generator. Refer to the video test

generator user's guide for further assistance.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

1-7-3. Access Test Menu

1. Press the Menu button.

2. Press and hold Reset (approximately 5 seconds) to

display the Test Menu.

3. The Menu at the right will appear.

4. Under Video, the following choices appear.

•SECAM R-Y #

•SECAM B-Y #

•VI-BRIGHT #

•VI-CONTRAST #

5. Under C.UNIF., the following will appear.

•This function can be turned ON or OFF

•No. are adjustment points from 1 to 33

•In each point you can adjust W, R, G, & B

•Once selected, the list appears at the bottom of

the screen.

6. Under DAC-P the following will appear.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments

7. Under S/H, the following will appear.

8. Under SPECIAL, the following will appear.

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