3M MP8670l User manual

Service Manual
MP8670/8745/8755/8770 Multimedia
Projector
3M Visual Systems Division E. P. S. Service Documentation
6801 River Place Boulevard Copyright © 2000, 3M IPC. All Rights Reserved.
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
Copyright 2000, 3M IPC. All Rights Reserved. i
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-1
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-2
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-3
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-4
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-5
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).
OR
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-6
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-7
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
Copyright 2000, 3M IPC. All Rights Reserved. 1-8
7. Under S/H, the following will appear.
8. Under SPECIAL, the following will appear.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-9
2
Alignment
1-7-4. S/H Timing Adjustment
Adjustment Preparations
1. Use a SVGA (MP8670) or XGA (MP8745), VESA
(60) timing signal to input a 0.7V p-p cross hatch
signal.
2. Use H-PHASE in the Adjustment Menu to adjust the
cross hatch pattern so it is most clearly visible.
3. Reset S/H.
•Position the cursor on S/H in the adjustment Menu
and Press the RESET key.
Adjustment Procedure
1. Use S/H – S/H Timing in the Adjustment Menu until
the Vertical Stripes in the cross hatch pattern are the
most clearly visible.
2. Check to see that the vertical jitter is within the range
of -16 < A < +16 at the value obtained from step 1.
3. If there is jitter, change S/H – S/H POL, in the
adjustment Menu, from POSI to NEGA or NEGA to
POSI.
4. Return S/H – S/H TIMING to the value obtained in
step 1.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-10
2Alignment
1-7-5. SUB POSITION Adjustment
Adjustment Preparation:
1. Make this adjustment after completing S/H Timing
Adjustment.
2. Use a SVGA (MP8670) or XGA (MP8745), VESA
(60) timing signal to input a 0.7V p-p cross hatch
signal.
3. Press the AUTO button on the Remote Controller.
Adjustment Procedure
1. Use the SVGA (MP8670 or XGA (MP8745) VESA
(60) timing signal to input a 0.70V p-p frame signal.
2. Use S/H - SUB H POSI. Adjust so that the left and
right frames are displayed.
√√ Note
The frame is displayed in three steps at this stage. Adjust
only the center step. Colors may appear in vertical stripes
in some cased.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-11
2
Alignment
1-7-6. Ghost Adjustment
Adjustment Preparation:
1. Make this adjustment after completing SUB H POSI.
2. Use a SVGA (MP8670) or XGA (MP8745), VESA
(60) timing signal to input a 0.7V p-p cross hatch
signal.
3. Use H-PHASE in the Adjustment Menu to adjust the
cross hatch pattern so it is most clearly visible.
Adjustment Procedure:
4. Display Ghost Test Pattern.
5. Use S/H – GHOST (R) to adjust so that the Red
Ghost is at a minimum.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-12
6. Display Ghost Test Pattern.
7. Use S/H – GHOST (G) to adjust so that the Green
Ghost is at a minimum.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-13
8. Display Ghost Test Pattern.
9. Use S/H – GHOST (B) to adjust so that the Blue
Ghost is at a minimum.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-14
1-7-7. Flicker Adjustment
1. Make this adjustment after completing GHOST
adjustment.
2. Use a SVGA (MP8670) or XGA (MP8745) VESA
(60) timing sugnal to input a 0.35V p-p , R primary
color Signal for every other line.
3. Use DAC-P – V.COM-R from the adjustment Menu
to adjust Flicker to a minimum.
4. Use a SVGA (MP8670) or XGA (MP8745) VESA
(60) timing sugnal to input a 0.35V p-p , G primary
color Signal for every other line.
5. Use DAC-P – V.COM-G from the adjustment
Menu to adjust Flicker to a minimum.
6. Use a SVGA (MP8670) or XGA (MP8745) VESA

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-15
(60) timing signal to input a 0.35V p-p , B primary
color Signal for every other line.
7. Use DAC-P – V.COM-B from the adjustment Menu
to adjust Flicker to a minimum.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-16
1.
1-7.
1-7-8. NRSH Adjustment (Vertical Streak Adjustment)
1. Make this adjustment after completing Flicker
Adjustment.
2. Use an SVGA (MP8670) or XGA (MP8745) VESA
(60) timing signal to input a 0.7 V p-p, 16-step Gray
Scale.
3. Use DAC-P – NRSH in the adjustment menu to
adjust until vertical streaks are a minimum of every 6
or 12 dots.
4. If streaks are still displayed, use S/H – S/H TIMING
in the adjustment menu until vertical streaks are at a
minimum.

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-17
1-7-9. White Balance Adjustment
Make this adjustment after completing NRSH
adjustment.
1. Use an SVGA (MP8670) or XGA (MP8745) VESA
(60) timing signal to input a 0.7 V p-p, 16-step
monochrome green signal.
2. Use DAC-P – SUB BRIGHT and DAC_P – SUB
CONTRAST-G from the adjustment menu for
optimum shading characteristics.
√√ Note
Lock DAC-P – SUB BRIGHT – G at 30.
Lock DAC-P – BLACK2-GAIN – G at 50.
Use DAC-P – SUB-BRIGHT – G to adjust the last
two of the 16-steps on the bright side so they can no
longer be distinguished then come back slightly.
After adjusting, if contrast is insufficient, use DAC-
P SUB CONTRAST – G to slightly increase
contrast. Repeat step 3.
To lower only the black level, adjust BLACK2-
GAIN – G.
3. Use an SVGA (MP8670) or XGA (MP8745) VESA
(60) timing signal to input a 0.21V p-p White signal.
4. Use DAC-P – SUB BRIGHT – R and DAC-P –
SUB BRIGHT – B in the adjustment menu to
adjust color coordinates in the center of the screen
to the following:
X = 0.280 ±± 0.005
Y = 0.340 ±± 0.01
(Low brightness white level)

3MMultimedia Projector MP8670/8745/8755/8770 Adjustments
Copyright 2000, 3M IPC. All Rights Reserved. 1-18
5. Use an SVGA (MP8670) or XGA (MP8745)
VESA (60) timing signal to input a 0.52V p-p
White signal.
6. Use DAC-P – SUB BRIGHT – R and
DAC-P – SUB CONTRAST – B in the
adjustment menu to adjust color coordinates in
the center of the screen to the following:
X = 0.280 ±± 0.005
Y = 0.345 ±± 0.01
(Medium brightness white level)
7. Repeat steps 4through 7, as necessary, to check,
and readjust low and medium level brightness
white balance.
8. Use an SVGA (MP8670) or XGA (MP8745)
VESA (60) timing signal to input a 0.70V p-p
White signal.
9. Use DAC-P – BLACK2 GAIN – R and DAC-P –
BLACK2 GAIN – B in the adjustment menu to
adjust color coordinates in the center of the
screen to the following:
X = 0.270 ±± 0.03
Y = 0.320 ±± 0.03
(Black white balance)