DLP PROJECTOR PB8250 SERVICE MANUAL CONTENT Chapter 1: Engineering Specifications.................................................................................................1 Appendix A Optical Measurement Procedure..............................................................................6 Chapter 2: Spare Parts List.................................................................................................................15 Chapter 3: Product description and operation.........................
Chapter 1: Engineering Specifications 1
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Appendix A Optical Measurement Procedure 1. Scope: This document describes critical optical related test definitions and Instructions for data or video projectors. The other general terminologies are specified in ANSI IT7.228-1997. 2. General Requirements 1. The unit under test should be allowed to stabilize without further adjustment for a minimum of 5 minutes, at nominal ambient room temperature of 25°C, before making measurements. 2.
Note: L10, L11, L12, L13 are located at 10% of the distance from corner itself to L5 A2. ANSI UNIFORMITY ANSI +Uniformity= Maximum (L1~13)-Average (L1~9)/ Average (L1~9)% ANSI -Uniformity= Minimum (L1~13)-Average (L1~9)/ Average (L1~9)% A3. JBMA UNIFORMITY JBMA Uniformity = Average (L1,L3,L7,L9)/ L5 A4.
JBMA Contrast = Average (L1,L2,L3,L4,L5,L6,L7,L8,L9) under solid white / Average (L1,L2,L3,L4,L5,L6,L7,L8,L9) under solid black A7. LIGHT LEAKAGE Leakage = The maximum light leakage under a solid black pattern in or outside of the projected image A8. IMAGE DISTORTION Keystone = (W2-W1)/ (W1+W2) x 100% Vertical TV dist = (H1+H2-2xH3)/2H2 x100% Horizontal TV dist = (W1+W2-2xW3)/2W1 x100% W1: image width at image bottom W2: image width at image top W3: image width at the half image height.
center of the screen that is entirely the measured color under default brightness and contrast settings. A14. COLOR UNIFORMITY Color Uniformity is the maximum color difference (△x, △y) between any two points out of L1~L13 A15. ANSI COLOR UNIFORMITY ANSI Color Uniformity: △u’v’= [(u’1-u’0)^2+(v’1-v’0)^2]^1/2 (u’0,v’0): the average color of L1~L13 (u’1,v’1): the spot with maximum deviation from (u’0,v’0) A16.
Step 2: Check specified screen sizes and zoom positions Step 3: Use Chart1 to measure Lateral Color for whole screen with Pattern 5 and record the maximum number Example if 0.6 pixel lateral color: A20. LAMP LIFETIME TEST PROCEDURE 50% lamp brightness maintenance under 3.5hr ON, 0.5hr OFF cycling test A21.
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Chapter 2: Spare Parts List PB8250 Spare Parts List Item No. Sales Location Notes 99.J8177.B81 PB8250 99.J8177.B8K Korea PB8250 99.J8177.B8T Taiwan PB8250 NO. PART NO. DESCRIPTION Location 1 22.91008.001 SKT PLUG 2/3P W/G PSE 2 23.10035.011 FAN 12V 60*60*25 GB1206PTV2-A 3 23.10035.051 FAN 12V 60*60*25 GB1206PTV3-A 4 23.10090.021 FAN 12V50*50*20 80M GB1205PKV 5 23.10107.021 FAN DC12V 60*15 70MM AD0612XB 6 23.10110.011 FAN 12V 80*80*25/92*25 SUNON 7 27.01018.
29 56.26J95.001 REMOTE PB8250 FORWARD 30 60.J8115.001 ASSY POWER+BRIDGE BD PB8250 31 60.J9418.001 ASSY SUB U/C PB8240 32 60.J9420.001 ASSY SUB L/C PB8240 33 60.J9420.002 ASSY SUB LOWER CASE PB8240 34 65.J7603.111 CW DIA46 DEG110 PB2240 PRODIS 35 65.J9301.001 PL ZOOM PB8240 COSINA 36 71.07XGA.B01 IC DMD 0.7XGA DDR 12 FTP PIXE 37 59.J8101.CG1 Service lamp 38 60.J9428.
Chapter 3: Product description and operation Shipping Contents The projector is shipped with the cables required for connection to a PC and to video equipment. Carefully unpack and verify that you have all of the items shown below. If any of these items are missing, please contact your place of purchase.
Optional Accessories 1. 2. 3. 4. 5. 6.
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Controls and Functions 20
Remote Control Description 21
Remote Control Effective Range Infra Red (IR) remote control sensors are located on the front and the back of the projector. The remote control must be held at an angle within 30 degrees of the projector’s IR remote control sensors to function correctly. The distance between the remote control and the sensors should not exceed 6 meters (19.5 feet).
Installing or Replacing the Batteries 23
Installation Choosing a Location Your projector is designed to be installed in the four installation configurations shown here: Floor front, Ceiling front, Floor rear, Ceiling rear. Your room layout or personal preference will dictate which installation configuration you use. If you place the projector above or below the screen, you have to tile it down or up to center the image on the screen, in these situations image distortion will occur. Use the Keystone function to correct the distortion.
Connecting to a Laptop or Desktop Computer Connecting Equipment to the Component Video Input The projector is capable of displaying various High Definition TV display modes. Some of these sources are: Most of these sources will provide an analog component video output, a standard VGA output, or a YPbPr (default) format. The projector is capable of accepting HDTV data through a Component Video connector. Use a Component Video cable that came with your projector to display these images.
The following standards are supported in the HDTV function: Connecting to Video or S-Video Devices Connecting to Display Devices If you want to monitor your presentation close-up on a monitor as well as on the screen, you can connect the RGB signal output port on the projector to an external monitor with a VGA cable or D-Sub - DVI cable.
Adjusting the Height The projector is equipped with 2 quick-release adjuster feet. Screen Size Place the projector at the required distance from the screen according to the required picture size (see the table on the next page).
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Operation Start Up 1. Switch all of the connected equipment on. 2. Plug the power cord into the projector and into a wall socket. 3. Turn on the wall socket switch (where fitted). 4. Turn the main power switch on. The Power indicator lights orange. 5. Press and hold Power on the remote control or projector to start the unit. The Power indicator light flashes green when the power is turned on.
6. The start up procedure takes about 30 seconds after pressing Power. In the later stage of start up, a default BenQ logo appears. 7. Next, the projector starts to search input signals. Irrespective of selected input source, the screen shows “Acquiring Signal” at the bottom right corner of the screen.
Source Selection Auto Adjustment 32
Blank Zoom / Focusing Adjust the projected image to your desired size using the lens’ zoom ring. Then focus the image by rotating the focus ring.
Laser Pointer Operation The Laser Pointer is a presentation aid for professionals. It emits red colored light when you press it and the LED indicator lights up green. Do not look into the laser light window or shine the laser light beam on yourself or others. Refer to the warning messages on the back of the remote control and the attached “User Information” prior to using it. Mouse Function Operation Connect the projector to your PC or notebook with a USB cable prior to using these functions.
PIP (Picture In Picture) Operation By pressing the PIP-Source, PIP-Pos and PIP-Size hot keys, you can enable the PIP (Picture In Picture) function and choose the position and size of the PIP image.
Menu Operation Menu System Please note that the OSD menus vary according to the signal type selected.
Using the menus The projector is equipped with on-screen display (OSD) menus for making various adjustments and settings. There are 10 different menu languages. The following example describes the adjustment of the keystone.
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Packing Description 47
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Appearance Description 52
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Lamp Replacement Use and Replacement of the Lamp When the Lamp Indicator lights up red or a message appears suggesting it is time to replace the lamp, please install a new lamp or consult your dealer. An old lamp may cause a malfunction in the projector and in some instances the lamp may explode. Lamp Replacement To reduce the risk of electrical shock, always turn the projector off and disconnect the power cord before changing the lamp.
To reduce the risk of injuries to fingers and/or compromising image quality by touching the lens, do not touch the empty lamp compartment when the lamp is removed. This lamp contains mercury. Consult your local hazardous waste regulations and dispose of this lamp in the proper manner.
Temp Warning Light When the Temperature warning light is on, it is warning you of the following possible problems: 1. The internal temperature is too high. 2. Air Filters are clogged. 3. The fans are not working. Turn the projector off , check that the air filters are clean. If the problem persists, contact qualified service personnel for further help. For more detailed information, please refer to the following section. Indicators Illustration - table legend.
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Shutdown 60
Chapter 4: Circuit Operation Theory PB8250 DMD projector being using the XGA DMD Engine made by BENQ, it included front end circuitry that digitizes and scaling processes for the input analog VGA and TV signals. As shown, in figure below the front end circuitry consists of : 1. Frond end Circuitry 1.1 Power supply module include PFC and DC/DC portion. DC/DC portion provide 12V, 5V and 2,5V for whole system.
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2. DMD driver board that transfer PW166 scaler output RGB888 signal to DMD chip acceptable signal for driving DMD mirror operation. The relate diagram as below: 3.
Lam p Module Optical Device EMI Filter PFC Lam p On Optical Engine DMD Power B oard and B allast C olor W heel DC /DC B allast l a n g i S Fan 2.
The Image Processor also known as “Scaler” , which indicate its main function , expand or downsize the digital picture from ADC to a fixed size digital image output . The CPU which control the whole system is embedded inside the Image Processor , there is also a Real Time Operating System which incorporates with the CPU as hardware layer interface . The EEPROM stores the system information such as brightness , contrast …which ensure the system operates under the most user friendly circumstance .
ADHSYNC – Providing the Horizontal Synchronization signal to AD9882. ADVSYNC - Providing the Vertical Synchronization signal AD9882. DDC interface – Providing Digital Display Channel , which include VCC(Pin9) , SCL(Pin15) , SDA(Pin12) . - Analog Flat Panel Interface (ADC Converter) , AD9882 The ADC converter digitizes the input analog RGB data signal from D_SUB and offers designers Digital Visual Interface (DVI) receiver, then output the digital data streams to Image Processor.
DEN – Data enable signal output to DMD BD , provided as a valid data indicator signal for DMD driver. VCLK – V-port pixel clock. VPEN – V-port data enable. VVS – V-port Vertical Synchronization. VHS – V-port Horizontal Synchronization. VFILED – V-port Even/Odd frame indicator. RESETZ – Output to DMD driver BD as RESETZ signal for DMD normal operation. ABNORMAL – Input to CPU for indicating abnormal condition , if the CPU detects an abnormal status , it will disable lamp ignition.
software system will detect the abnormal signal. Sensor BD: The Sensor BD provides the color wheel index signal to DMD BD. The CWINDEX shall indicate the beginning of the red light on the DMD device. The phase of the display data on the DMD based on the CWINDEX signal. It can be configured to delay the CWINDEX for electronic alignment of the color wheel. The timing of CWINDEX and the delayed CWINDEX is shown in Figure 1.
Chapter 5: Alignment Procedure 1. DMD Bias Voltage Alignment Equipment: None Procedure: (1) Watch DMD “Bias Voltage Bin” Label (Example: 8060-7bbc DDDD XXXXXXX M ) (2) Switch the DIP switch (H8) on Chip board according to the red character on the DMD chip 00: E 01: D 10: C 11: B ON 0 0 2.
- Probe Procedure: (1) Probe impedance matches 50 ohm (2) Open Factory OSD, and select color wheel delay item (3) Leave the image pure red (DMD red curtain) (4) Put the detector on the screen that red image was projected.
4. S-Video and HDTV Color Adjustment Procedure Equipment: - Pattern generator (VG-828) Lux meter ( CL-100) or CA 120 Procedure: (a) S-video adjustment(current source is S-video) (1) color spec x: 0.281±0.015 y: 0.297±0.015 (2) Change Timing and Pattern of pattern generator Timing:480i (60Hz) Pattern:80% Gray pattern (3) Adjust R.G.
If we line the x and y, then the Pb offset is the shift action and the Pr offset is the rotational action. (3) Connect power, YPbPr Video into projector. (4) Change Timing and pattern of pattern generator : Timing : 480P(H:31.54 KHz,V:60.08 Hz) pattern : black (5) Light on projector (6) Set user OSD values to default. (7) Enter factory mode. (8) Set Factory values to default. (9) Follow the PbPr offset adjustment flow chart: Use Lux meter to read the coordinate of black and the value note (x1,y1).
Chapter 6: Trouble Shooting Common Problems & Solutions 73
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Chapter 7: Schematics drawing 83
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