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3M



Multimedia Projector MP8670/8745/8755/8770

Disassembly/Reassembly

Copyright



2000, 3M IPC. All Rights Reserved.

2-6

3

1

2

2-3-4.

Remove Driver PWB 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 and main PWB board.

1.

Release three (3) ribbon connectors.

√√

Note

Slide base of connector (1a) to open position to release
ribbon cable (1b).

2.

Remove one (1) screw securing circuit board.

3.

Remove two (2) screws securing metal brace and
circuit board.

4.

Carefully lift board upward to remove from base.

5.

Reassemble in reverse order.

!

Caution

!

WARNING

1a

1 b

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Summary of Contents for MP 8770

Page 1: ...S 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 ...

Page 2: ... 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 SEC...

Page 3: ...e 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 ü 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 ...

Page 4: ... 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 r...

Page 5: ...move 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 ...

Page 6: ...l 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 t...

Page 7: ...l 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 cen...

Page 8: ...hite 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 remo...

Page 9: ... 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 ...

Page 10: ...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 ...

Page 11: ...attern 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 cha...

Page 12: ...0 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 ...

Page 13: ... 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 ...

Page 14: ...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 ...

Page 15: ...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 ...

Page 16: ... 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 M...

Page 17: ... 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 ...

Page 18: ...is 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 ...

Page 19: ... 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 si...

Page 20: ...tes 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 coordin...

Page 21: ...H 3 1 7 10 Color Uniformity Adjustment Adjustment Preparations 1 Make this adjustment after completing the White Balance Adjustment 2 This adjustment is to assure color uniformity over the entire screen Adjust all 33 points in sequence starting with the smallest signal 3 Do not adjust point 1 because the brightness of the entire screen will be changed 4 Only adjustment points 2 and 3 can be adjust...

Page 22: ...ry color signal 50 Green 2 Measure the illumination at points No 2 and No 3 The Values should be No 2 Y2 lux No 3 Y3 lux 3 Determine which point No 2 or No 3 has the higher illumination 4 Adjust the higher to match the lower For example if Y2 Y3 Adjust No 2 G to 10 of the value of Y 3 Y2 y3 10 This completes the Green color adjustment 5 Use an SVGA MP8670 or XGA MP8745 VESA 60 timing signal to inp...

Page 23: ...10 6 4 8 2 1 3 7 5 9 V 6 V 3 V 3 V 6 H 6 H 6 H 3 H 3 23 24 22 14 30 29 16 28 31 17 32 33 15 25 27 26 20 12 13 21 11 19 18 10 6 4 8 2 1 3 7 5 9 V 6 V 3 V 3 V 6 H 6 H 6 H 3 H 3 7 The next adjustments will be to balance the color uniformity shown in gray at right 8 Next measure the color coordinates of point 2 Adjust R and B of Point 2 until the color coordinates are x2 x1 0 01 x2 y1 0 01 9 Measure a...

Page 24: ...6 H 6 H 6 H 3 H 3 23 24 22 14 30 29 16 28 31 17 32 33 15 25 27 26 20 12 13 21 11 19 18 10 6 4 8 2 1 3 7 5 9 V 6 V 3 V 3 V 6 H 6 H 6 H 3 H 3 10 The next adjustments will be to balance the color uniformity shown in gray at right 11 Next measure the color coordinates of point 10 Adjust R and B of Point 10 until the color coordinates are x10 x1 0 01 x10 y1 0 02 12 Measure and adjust the color coordina...

Page 25: ... V 3 V 3 V 6 H 6 H 6 H 3 H 3 23 24 22 14 30 29 16 28 31 17 32 33 15 25 27 26 20 12 13 21 11 19 18 10 6 4 8 2 1 3 7 5 9 V 6 V 3 V 3 V 6 H 6 H 6 H 3 H 3 14 The next adjustments will be to balance the color uniformity shown in gray at right The following are visual color uniformity checks and adjustments for color uniformity of the periphery 15 Adjust points 18 through 21 to achieve color uniformity ...

Page 26: ...6 H 6 H 6 H 3 H 3 23 24 22 14 30 29 16 28 31 17 32 33 15 25 27 26 20 12 13 21 11 19 18 10 6 4 8 2 1 3 7 5 9 V 6 V 3 V 3 V 6 H 6 H 6 H 3 H 3 16 The next adjustments will be to balance the color uniformity shown in gray at right The following are visual color uniformity checks and adjustments for color uniformity of the corners 17 Adjust points 22 through 33 to visually achieve color uniformity in t...

Page 27: ...lectrical 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 Phillips Screwdriver 1 Magnetic Long Shaft Standard Screwdriver 3 16...

Page 28: ... to cool off prior to lamp removal or disassembly Remove the top cover to access the internal projector components 1 Remove one 1 screw on back of projector Note If equipped remove three 3 screws securing document camera mounting bracket 2 Remove three 3 screws silver colored from top of RGB Video input panel on side of projector 3 Remove one 1 black screw on side of projector 4 Remove two 2 screw...

Page 29: ...70 Disassembly Reassembly Copyright 2000 3M IPC All Rights Reserved 2 3 7 6 6 Carefully lift front of top cover to the open position 7 Remove ribbon cable at circuit board and release wire from plastic wire manager 8 Reassemble in reverse order ...

Page 30: ...sassembly 9 Remove six 6 cable wire connectors 10 Remove five 5 cable wire connectors Note Some of these wire connectors are on the underside of the circuit board 11 Remove one 1 ground wire screw 12 Remove one 1 ribbon connector Note Carefully lift straight up on both ends of the connector bar 4a to release the ribbon cable 4b Handle with care this type of connector is easily broken 13 Remove fou...

Page 31: ...rming 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 and main drive board 1 Locate the service board 2 Remove one 1 wire connector 3 Remove one 1 screw securing board 4 Remove plastic spark shield located under board 5 Reassemble in reverse order Caution WARN...

Page 32: ...burns to fingers allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly Remove top cover and main PWB board 1 Release three 3 ribbon connectors Note Slide base of connector 1a to open position to release ribbon cable 1b 2 Remove one 1 screw securing circuit board 3 Remove two 2 screws securing metal brace and circuit board 4 Carefully lift board upw...

Page 33: ...and internal projector components to cool off prior to lamp removal or disassembly Remove top cover main PWB board and driver PWB board 1 Remove four 4 silver screws securing RGB input board to side of projector base 2 Remove one 1 black screw 3 From inside the projector remove two 2 retaining screws securing RGB input board bracket to bottom of projector base 4 Press down on signal circuit board ...

Page 34: ...o 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 main board drive board ballast DC power fan and lens 1 Remove three 3 screws securing dichroic unit to projector base 2 Disconnect wire connector 3 Carefully lift upward to remove dichroic unit from projector base 4 Reassemble in...

Page 35: ...allow projector lamp and internal projector components to cool off prior to lamp removal or disassembly Remove top cover main board drive board ballast and DC power fan 1 Remove two 2 screws securing filter to dichroic unit Note Gently remove the filter taking care not to damage the three ribbon cables 2 Remove six 6 screws securing lens to the projector base 3 Carefully lift the lens assembly upw...

Page 36: ...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 two 2 screws securing bottom of ballast 2 Remove two 2 wire connectors 3 Remove one 1 screw securing metal clip 4 Remove metal clip and unplug wire connector leading to the lamp module 5 Carefully remove ballast from projector body 6 Reass...

Page 37: ...ntenance 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 main board drive board lens assembly and dichroic unit 1 Remove RGB input board See Section 2 3 5 2 Disconnect white wire connectors 3 Remove one 1 screw securing signal board 4 Carefully remove signal board 5 Reasemble...

Page 38: ...aintenance 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 and main PWB board 1 Remove two 2 screws securing fan grill and fan Note These screws are different sizes The short screw 1a is on the left and the longer screw 1b is on the right 2 Carefully remove fan 3 Reassemble i...

Page 39: ...lug 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 1 Remove one 1 screw securing metal bracket 2 Remove bracket 3 Remove fan wire connector and remove fan 4 Reassemble in reverse order Caution WARNING ...

Page 40: ...ight 2000 3M IPC All Rights Reserved 3 1 3 Troubleshooting This section provides flowcharts to aid in troubleshooting the 3M MP8670 8745 Multimedia Projector 3 1 Troubleshooting Checkpoints The following troubleshooting checkpoints that will help you diagnose problems ...

Page 41: ...on the Main PWB at Standby Mode Measure Voltage at Pin 28 of EDI1 on the Main PWB at Standby Mode Power Unit Circuit Fuse Filter PWB Disconnect ETEP from Main PWB Retry Turn On Main PWB Temperature PWB Main PWB No No No No No 1 CHK0082 12 5V 4 CHK0041 6 6V 6 CHK0043 17 0V Yes 28 CHK0023 H H 2 5V Yes Power Cannot be Turned On AC On No LED s Lit Check at operating mode CHK0023 L ...

Page 42: ...cuit Short between Pin 1 and 2 of ELC1 on the Main PWB and Try again Measure Voltage at the CHK0082 EDS1 on the Main PWB Standby Mode Set the Lamp Cover LIMIT SWITCH LAMP DOOR What is the State of LAMP Indicator during Operation Set the Lamp Again LIMIT SWITCH LAMP No Yes No More Than 12 5V No Yes Yes Main PWB Blinks Lit Change the Lamp Does the Lamp Light Yes Power Unit Ballast No Lamp Not Lit Co...

Page 43: ...MP Indicator Is Pin 1 of EBAR on the Main PWB set to H Main PWB No Power Unit Ballast Yes H 5V Retry after Shorting between Pin 1 and 3 of EBAF on the Main PWB and Retry Short between Pin 1 and 3 of EINF on the Main PWB and Retry DC FAN LAMP DC FAN EXHAUST DC FAN INTAKE Yes Yes Yes No No Blinks Short Between Pin 1 and 3 of ELMF on the Main PWB and Retry Main PWB No Not Lit 3 Fans have Rotation Sen...

Page 44: ... Is the 1 2 Selected Signal Changed at pin 43 CHK007 of EDI1 on the Main PWB Yes L RGB1 H RGB2 H 5V Main PWB No RGB Input Terminal PWB No Are Signals Input at each Pin of EDI1 on the Main PWB Yes Main PWB No 10 11 CHK0031 R signal 6 7 CHK0035 G signal 2 3 CHK0037 B signal 39 CHK010 H sync 38 CHK011 V sync RGB Input Terminal PWB Signal PWB Power Unit Circuit Check at operating mode No Input Detecte...

Page 45: ...al Yes 6 9V Are the Input Signals Output at Pins 1 3 5 of EVSI on the Main PWB VIDEO Input Terminal VIDEO Input Terminal PWB No Yes Input Both S Signal Composite Video Signal 49 CHK002 VIDEO R signal 47 CHK004 VIDEO G signal 45 CHK006 VIDEO B signal 36 CHK012 VIDEO H sync 35 CHK013 VIDEO V sync 1 Video signal 3 Y signal 5 C signal Are Signasl Input at each Pin of EDI1 on the Main PWB No RGB Input ...

Page 46: ...HK075 H sync 63 CHK074 V sync 15 66 CHK055 CLK Are Signals Input at the Pins below of EMD1 on the Main PWB No Main PWB Yes Drive PWB No PWB Input Terminal RGB PWB Signal 4 CHK0041 6 6V 6 CHK0043 17 0V 8 CHK0044 5V 10 CHK0038 5V 12 CHK0039 5V 14 CHK0040 5V 10 11 CHK0031 R signal 6 7 CHK0035 G signal 2 3 CHK0037 B signal 39 CHK010 H sync 38 CHK011 V sync 49 CHK002 VIDEO R signal 47 CHK004 VIDEO G si...

Page 47: ...ignal Output at Pins 8 10 of EVS1 on the Main PWB VIDEO Input Terminal No PWB Input Terminal VIDEO Yes Power Unit Circuit Signal PWB 8 Audio L 10 Audio R Check at operating mode RGB and VIDEO Input Signal PWB No Sound Both RGB and VIDEO Signal Input Speaker No Sound No Sound when VIDEO Signal Input Sound is heard when RGB signal input ...

Page 48: ...o RS232C PS 2 ADB Serial 1 2 CLK 3 DATA DATA 6 SEL0 SEL0 SEL0 SEL0 7 RTS RTS RTS RTS 9 5v 5v 10 GND GND GND GND 12 SEL1 SEL1 SEL1 SEL1 13 RDP 14 TDP TD Check at operating mode Cannot Control Mouse or RS232C Are the Signals Input at each Pin of EDI1 on the Main PWB No RGB Input Terminal PWB Yes 26 CHK0019 Mouse 24 CHK0020 TXD 23 CHK0021 RXD Main PWB ...

Page 49: ...5 8755 8770 Troubleshooting Copyright 2000 3M IPC All Rights Reserved 3 10 3 9 Can Not Control USB Mouse Can Not Control USB Mouse Is the Voltage at Pin 26 CHK0019 of EDI1 on the Main PWB set to H No Main PWB Yes RGB Input Terminal PWB ...

Page 50: ... 3 10 Signal Waveforms of P501 P601 and P701 Input Signal is VGA3 7 5V DC 4V 9V 1H 1 8 pin 5 PCG pin 1 36 V COM 4V 9V 2H V DATA 4V 9V 1H 12 5V 1H pin 8 VCP pin 9 VCP 4V 9V 200nS 1H HMC EG01 14 5V ER01 EB01 GND pin 16 pin 20 H DATA 1H pin 21 pin 28 HCP 4V 9V 100nS 100nS pin 30 31 SIG 1 2 7 5V 2V 5V 2C 5V 1H 1H ...

Page 51: ...media Projector MP8670 8745 8755 8770 Troubleshooting Copyright 2000 3M IPC All Rights Reserved 3 12 Signal Waveforms of P501 P601 and P701 Input Signal is VGA3 Continued pin 30 31 SIG 1 2 7 5V 4 5V 4 5V 1H 1H ...

Page 52: ...tton on the top of the projector or the Video1 2 button on the remote control 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 sent to the RGB video selector and the luminal Y signal is sent to the sync selector Driver Board The signal passes through another selector then to the AD converter The analog signal i...

Page 53: ...erved 4 2 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 MP8670 8745 4 1 3 MP8670 8745 Circuitry Diagram ...

Page 54: ...r has its own measurable wavelength or combination of wavelengths The wavelengths of light are not colored but produce the sensation of color 4 2 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...

Page 55: ...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 3 2 How Light Passes Through An LCD Polarized light entering the cells from the rear is aligned so that it will pass the light thr...

Page 56: ...h 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 ...

Page 57: ...wave plate polarizer that allows for passage of both horizontal and vertical light waves mirrors dichroic mirrors polarizers and LCD panels Component Description Lamp Projects light Mirror Reflects all light waves Dichroic Mirror Coated to reflect some light waves and let others pass through Wave Plate Polarizer Allows both horizontal and vertical light waves at the right angles to pass through LC...

Page 58: ...3M Multimedia Projector MP8670 8745 8755 8770 Theory and Diagrams Copyright 2000 3M IPC All Rights Reserved 4 7 4 6 Block Diagram ...

Page 59: ...4 7 Wire Diagrams Copyright 2000 3M IPC All Rights Reserved 4 8 4 ...

Page 60: ...4 7 Wire Diagrams Copyright 2000 3M IPC All Rights Reserved 4 9 ...

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