3M MP7770 User manual

MP7770 Multimedia Projector
Service Manual
3M Visual Systems Division EPS Service Documentation
6801 River Place Boulevard Copyright © 2002, 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 o
f
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 o
r
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.

MP7770 Table of Contents
2002, 3M IPC. i
SECTION 1. MACHINE OVERVIEW
1-1 Overview.................................................................................................................................................1-1
1-2 Machine Identification............................................................................................................................1-1
1-3 Cleaning..................................................................................................................................................1-1
1-4 Safety ......................................................................................................................................................1-2
1-5 Specifications..........................................................................................................................................1-3
SECTION 2. DISASSEMBLY/REASSEMBLY
2-1 Overview.................................................................................................................................................2-1
2-2 Required Tools........................................................................................................................................2-1
2-3 Steps for Removing Projector Components............................................................................................2-1
2-3-1 Remove Bottom Cover ...........................................................................................................2-2
2-3-2 Remove Top Cover.................................................................................................................2-4
2-3-3 Remove Interface Board Plate................................................................................................2-5
2-3-4 Remove Interface Board.........................................................................................................2-6
2-3-5 Remove DMD Kit...................................................................................................................2-7
2-3-6 Remove Main Fan...................................................................................................................2-8
2-3-7 Remove Power Supply and Flyback Converter......................................................................2-9
2-3-8 Remove Video Board .............................................................................................................2-10
SECTION 3. TROUBLESHOOTING
3-1 Troubleshooting Flowcharts ...................................................................................................................3-1
3-1-1 Firmware Update.........................................................................................................................3-1
3-1-2 Fan Cooling System Check .........................................................................................................3-2
3-1-3 Sound Check................................................................................................................................3-3
3-1-4 Video Check................................................................................................................................3-4
3-1-5 No Image, Start-Up Screen OK...................................................................................................3-5
3-1-6 No Image, No Start-Up Screen....................................................................................................3-6
3-1-7 Lamp Does Not Work..................................................................................................................3-7
3-1-8 No Function.................................................................................................................................3-8
3-1-9 Switch OFF In Hot Condition .....................................................................................................3-9

MP7770 Table of Contents
2002, 3M IPC. ii
SECTION 4. THEORY AND DIAGRAMS
4-1 Theory of Operation..............................................................................................................................4-1
4-2 Wiring Diagrams...................................................................................................................................4-2
4-2-1 Wire Routing...............................................................................................................................4-2
4-2-2 Wire Routing Parts Identification................................................................................................4-3
4-2-3 Component Connections .............................................................................................................4-4
4-3 Cabling and Cable Connectors..............................................................................................................4-5
4-3-1 PC and MAC Cabling..................................................................................................................4-5
4-3-2 PC Cabling...................................................................................................................................4-6
4-3-3 Cabling Parts Identification.........................................................................................................4-7
4-3-4 Cable Connectors.........................................................................................................................4-8
4-4 Functional Diagrams .............................................................................................................................4-11
4-4-1 Component Layout ......................................................................................................................4-11
4-4-2 Component Pin Connections.......................................................................................................4-12

3M™Multimedia Projector MP7770 Machine Overview
2002, 3M IPC. 1-1
1. Machine Overview
1-1. Overview
Make advanced adjustments to this projector 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
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.
1-2. Machine Identification
To avoid incorrect adjustments or part replacements, verify the model and version of the projector prior to
making any adjustments or repairs.
Different versions have unique adjustment requirements. The serial number for the projector is located on the
machine identification label on the bottom of the projector.
1-3. Cleaning
When cleaning any components of the light engine, extreme care must be taken. Use only soft, dry, clean,
Chamois Swabs (Part number 78-8118-3302-5) to clean reflective surfaces. No chemicals should be used on any
surface.
Important
Use extreme care when cleaning any optics
device. Special coatings can be scratched very
easily.

3M™Multimedia Projector MP7770 Machine Overview
2002, 3M IPC. 1-2
1-4. Safety
Read and understand all safety procedures before making any repairs to the MP7770 Multimedia Projector.
Note
When any work is being carried out on the device, the mains cable must be disconnected from the mains supply.
Only service personnel may carry out service work. For any repair regional and corresponding national regulations
are to be followed.
Up to 30.000 V may be incurred when the lamp is ignited; lethal hazard!
An isolation transformer has to be used during any service to avoid possible shock hazard, because of not
protected live parts on opened device
Eye damage may result from directly viewing into the lamp
The lamp is very high temperature and high pressure during operation. Cool down, before opening lamp cover and
handling. Wear special protective glasses. Never switch “ON“ without the lamp (high voltage an lamp wiring, 25-35
kV).
1
1. Service and repairs may only be carried
out by well-trained personnel. Regional
and national regulations concerning the
execution of repairs have to be observed.
2. Operate the unit with mounted protection
plate only (item 1) for protection against
possible lamp explosion.
3. Put the unit on an antistatic and hard-to-
inflame support only.
4. Cables around power supply and lamp
are under high tension.
5. Take care not to touch the lamp base
when replacing the lamp. It is extremely
hot and may cause burns to the skin.
Allow the unit at least 5 minutes to cool
down.

3M™Multimedia Projector MP7770 Machine Overview
2002, 3M IPC. 1-3
1-5. Specifications
4,5
x
3,4
1,5
x
1,13
2
x
1,5
2,5
x
1,88
3
x
2,25
3,5
x
2,63
4
x
3
H%
B
x
H
36mm tele
6,0
L
(m)
28mm wide
(
m
)
4,0
3,0
2,0
5,4
4,7
3,4
3,3
2,7
2,6
2,3
1,9
1,5
1,1
~
100 - 240V AC
200 - 240V AC
50 - 63 Hz
35 C max
10 C min 3,0 Kg
95 F max
50 F min
1024
768
80
40
215
257
H
B
L

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-1
2. Disassembly/Reassembly
2-1. Overview
Disassembly and reassembly of the MP7770 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.
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.
2-2. Required Tools
An entire disassembly and reassembly can be completed with the following tools:
•=#3 Torx driver
•=#10 Torx driver
•=#15 Torx driver
•=5 mm nut driver
•=5.5 mm nut driver
•=Wire cutter
2-3. Steps for Removing Projector Components
Removal topics include:
•=Bottom Cover
•=Top Cover
•=Interface Board Plate
•=Interface Board
•=DMD Kit
•=Main Fan
•=Power Supply and Flyback Converter
•=Video Board
√
√√
√Note
If performing a complete disassembly, record lamp time.
! Caution
!WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-2
1
2
3
2-3-1. Remove Bottom Cover
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. Press locking tabs and lift upward to remove air filter
cover.
2. Press locking tab and open lamp door.
3. Press both sides of wire clip/handle to disengage.
! Caution !WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-3
4
5
6
7
8
4. Using steady pressure, pull upward on clip/handle to
remove lamp module.
5. Close lamp door.
6. Use a #10 torx driver and remove five (5) screws on
bottom of projector.
7. Remove one (1) longer screw by adjustment foot.
8. Carefully lift bottom cover off of projector body.
9. Reassemble in reverse order.

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-4
2
1
3
2
4
2
2-3-2. Remove Top Cover
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 bottom cover.
1. Use a #10 torx driver and remove three (3) screws
securing top cover.
2. Turn the projector over and carefully lift upward on
the top cover to separate it from the projector
components.
√
√√
√Note
Attached to the top cover is a ribbon cable and wire
connector that must be disconnected.
3. Disconnect ribbon cable.
4. Disconnect wire connector.
5. Remove top cover.
6. Reassemble in reverse order.
! Caution !WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-5
1
2
2
3
2-3-3. Remove Interface Board Plate
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 top and bottom covers.
1. Use a 5mm nut driver and remove four (4) nuts
securing plate.
2. Disconnect wire connector.
3. Remove plate.
4. Reassemble in reverse order.
! Caution !WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-6
1
2
3
2
2
2
2-3-4. Remove Interface Board
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 top cover, bottom cover and interface board
plate.
1. Disconnect seven (7) wire connectors.
2. Disconnect ribbon cable.
3. Use #10 torx driver to remove three (3) screws
securing board.
4. Carefully pull at top of board to separate the white pin
connector.
5. Reassemble in reverse order.
! Caution !WARNING
4
2

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-7
1
2
5
2
6
2
3
2
2
2
4
2
2-3-5. Remove DMD Kit
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 top cover, bottom cover, interface board plate
and interface board.
1. Use #10 torx driver to loosen one (1) screw securing
the thermostat.
2. Use a 5.5mm nut driver to remove three (3) nuts.
3. Use a #3 torx driver and remove four (4) nuts.
4. Use a #10 torx driver and remove one (1) screw.
√
√√
√Note
The DLP-Kit replacement board will
come with a protective spacer.
Remove spacer and install it on
all warranty returns, to prevent
damage during shipment.
5. Carefully separate DMD board and lay it down on the
bench top.
6. Disconnect one (1) ribbon cable connector.
√
√√
√Note
Notice the printing on the ribbon cable and during
reassembly, install the ribbon cable same side up.
Reversing the cable will cause poor image quality.
7. Reassemble in reverse order.
! Caution !WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-8
1
2
2
2
5
2
4
2
3
2
2-3-6. Remove Main Fan
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 top and bottom covers.
1. Disconnect all wire connectors from fan.
√
√√
√Note
It is very important to repeat the exact wire paths during
reassembly. A different wire path can cause excess noise
and reduce image quality.
2. Cut three (3) wire ties securing wires.
3. Use a #10 torx driver to remove three (3) screws
securing fan.
4. Slide the fan assembly forward to access one (1) wire
connector located underneath. Disconnect wire
connector.
5. Lift upward to remove the fan assembly.
6. Reassemble in reverse order.
! Caution !WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-9
1
2
2
2
3
2
4
2
2-3-7. Remove Power Supply and Flyback Converter
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. Cut one (1) wire tie.
2. Disconnect wire connector.
3. Remove one (1) screw securing power supply and
converter.
4. Remove one (1) wire connector.
5. Reassemble in reverse order.
! Caution !WARNING

3M™Multimedia Projector MP7770 Disassembly/Reassembly
2002, 3M IPC. 2-10
1
2
2
2
3
2
2-3-8. Remove Video Board
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. Remove one (1) screw securing video board and
plastic cover inside video board.
2. Separate video board and remove plastic cover.
√
√√
√Note
During reassembly, the plastic video cover must line up
with the screw hole for the video board. See Step #1.
3. Remove ribbon cable.
4. Reassemble in reverse order.
! Caution !WARNING

3MMultimedia Projector MP7770 Troubleshooting
2002, 3M IPC. 3-1
3. Troubleshooting
This section provides message flowcharts to aid in troubleshooting the 3MMP7770 Multimedia Projector.
3-1. Troubleshooting Flowcharts
3-1-1. Firmware Update
Factory Reset
Switch on
unit in Standby
Message:
"Parameter Factory Settings
Restored"
appears
Press Standby
Hold Menü
and Enter
pressed (appr. 10sec)
C6
/
S10
C6
/
S1
C6/S2;S9
Press Menü
and Enter
simultaneous
C6
/
S1
C6
/
S2;S9

3MMultimedia Projector MP7770 Troubleshooting
2002, 3M IPC. 3-2
3-1-2. Fan Cooling System Check
Main Fan
working? Cartridge Fan
working? Lamp Fan working?
Check
PIN1:+5V
PIN2:-5V
C1/J11
Check
PIN1:+4V
PIN2:GND
C1
/
J9
Check other fans
Change Main Fan
5b/12
Change Lamp Fan
5a
/
13
Change Cartridge Fan
7/9
NO NO NO
YES YES
YES
YES YES YES
NO
NO
No
+5V
Check
PIN3
C1/J11
-5V
YES
NO
Check
PIN3..........
700Hz 7V pp
C1
/
J9
YES
NO
No
Check
PIN3..........
300Hz 5V pp
C1
/
J7
Check
PIN1:+3V
PIN2:-5V
C1/J7
Projector switch off after approx. 5sec.
Standby blinks red
/
yellow
C6
/
S10
Change Interface
5a/260
Check Flyback output
Voltages Change Flyback-Converter
6
/
10
YES
NO
YES

3MMultimedia Projector MP7770 Troubleshooting
2002, 3M IPC. 3-3
3-1-3. Sound Check
No sound?
Change
Connectionboard
5a
/
11
Check Audio Signal
C1/J13
Check Audio Signal
C1/J6
Change Interfaceboard
5a
/
260
Change Speaker
3/40
YES
YES
NO
NO

3MMultimedia Projector MP7770 Troubleshooting
2002, 3M IPC. 3-4
3-1-4. Video Check
No Video
Data mode OK
Change
Connectionboard
5a
/
11
Check Video Signal
Change Interfaceboard
5a/260
good
Not
good
C1/J4