BenQ PB8250 - XGA DLP Projector User manual

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....................................................................................17
Shipping Contents......................................................................................................................17
Projector Description .................................................................................................................18
Remote Control Description ......................................................................................................21
Installation..................................................................................................................................24
Operation....................................................................................................................................30
Packing Description...................................................................................................................47
Appearance Description.............................................................................................................52
Lamp Replacement ....................................................................................................................55
Shutdown ...................................................................................................................................60
Shutdown ...................................................................................................................................60
Chapter 4: Circuit Operation Theory .................................................................................................61
Chapter 4: Circuit Operation Theory .................................................................................................61
Chapter 5: Alignment Procedure........................................................................................................69
Chapter 6: Trouble Shooting..............................................................................................................73
Chapter 7: Schematics drawing..........................................................................................................83

Chapter 1: Engineering Specifications
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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. Measurements shall take place in a light proof room, where the only source of
illumination is the projector. Less than 1 lux of the light on the screen shall be from any
source other than the projector.
3. All measurements shall be made on flat screens that do not provide any advantage to the
performance of the unit.
4. All measurements shall be made at standard color temperature setting, 100% white image
(per ANSI IT7.228-1997), except where noted.
3. Practical Requirements
1. When measuring contrast manually, operators should not wear white clothing since light
reflected from white clothing can influence the measurement.
2. Unless otherwise specified, the projection lens is set in the widest zoom position since
zoom function can influence the measurement.
3. Measurement should be performed with Minolta Chromameter, Model CL-100, or
equivalent.
A1. ANSI BRIGHTNESS
ANSI Lumens = (L1+L2+L3+L4+L5+L6+L7+L8+L9)/9 (lux) x A(m^2)
A (Area) = W * H (m^2)
W: width of projected image (m)
H: height of projected image (m)
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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. ANSI CONTRAST
ANSI Contrast = Average lux value of the white rectangles/Average lux value of the black rectangles
Contrast Ratio shall be determined from illuminance values obtained from a
black-and-white ”chessboard” pattern consisting of 16 equal rectangles. The white rectangles shall be
at 100% gray and the black rectangles at 0% gray. Illuminance measurements shall be made at the
center of each of the rectangles.
A5. FOFO CONTRAST
FOFO Contrast = Lux value at the center of a solid white screen/the lux value at the center of a solid
black screen
A6. JBMA CONTRAST
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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.
H1: image height at image left
H2: image height at image right
H3: image height at half image
Note:
1. Keystone and Vertical TV Distortion are recommended for Front Projection Display
2. Vertical and Horizontal TV Distortion are recommended for Rear Projection Display
A9. THROW RATIO
Throw ratio = projection distance / the width of the projected image
A10. ZOOM RATIO
Zoom ratio = maximum / minimum image diagonal size at a fixed projection distance
A11. FOCUS RANGE
The minimum/maximum focus distance is the minimum/maximum projection distance (The
distance between the outermost element of projection lens and screen), expressed in meter, at which
the image is still at its acceptable focus level.(acceptable focus level is specified by FOCUS LIMIT
SAMPLE approved by customer)
A12. COLOR
Color is expressed as (x, y) in 1931CIE chromaticity values Note: Color is measured at the center of
the screen that is entirely the measured color under default brightness and contrast settings.
A13. ANSI COLOR
ANSI Color is expressed as (u, v) in 1976 CIE chromaticity values Note: Color is measured at the
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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. PROJECTION OFFSET
Projection Offset= Image height above projection lens optical axis / Total image height x 100%
Note: Optical engine should be kept horizontal attitude
A17. BLUE EDGE INSPECTION CRITERIA
The blue edge must invisible with blue pattern 171 (R=50/255, G=100/255, B=255/255)
A18. DEFOCUS AND FLARE TEST PROCEDURE
Procedure:
Step 1: Get best focus at Screen Center with Pattern 1
Step 2: Check specified screen sizes and zoom positions
Step 3: Use Chart1 to measure Defocus and Flare for whole screen of R,G,B color at Pattern 2,3,4
and record the maximum number
Example of 1.5 pixel flare:
A19. LATERAL COLOR TEST PROCEDURE
Procedure:
Step 1: Get best focus at Screen Center with Pattern 1
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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. LIGHT LEAKAGE SPECIFICATION
Test under tele 47” to 60”
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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 27.01018.000 CORD H05VV-F13A250V 1830MM UK UK
8 27.01818.000 CORD SVT#18*3C10A125V 1830US US
9 27.82718.281 CORD H05VV-F 10A250V EUR BLK EU
10 31.J9401.011 NAME PLATE AL PB8250
11 42.J9406.001 REAR/C PC Y5003A PB8240
12 44.J7601.003 CTN AB PB7100/BENQ(VI)
13 47.J8104.001 BAG CARRY PB8250/8240/8140
14 50.72920.011 C.A MIN-DIN 4P S-VIDEO W/S 15
15 50.73213.501 CABLE 4P USB A-B 1800MM BLACK
16 50.J0508.503 SIGNAL/C 15/15P 20276 1800MM
17 50.J2103.501 CABLE RGA/DVI-A (WHDDC) 1.8M
18 50.J2401.001 CABLE D-SUB/RCA 1800MM/SL705X
19 50.L4302.501 CABLE AUDIO 284C/577C+CORE BL
20 54.J9412.001 BALLAST 300W O4 PB8250 OSRAM
21 55.J1313.001 PCBA 1L SENSOR-B BD SL700 X M
22 55.J5019.001 PCBA THERMAL BD DX850
23 55.J9401.001 PCBA MAIN BD PB8260
24 55.J9405.001 PCBA DC-DC BD PB8260
25 55.J9410.001 PCBA CONNECTOR BD PB8260
26 55.J9412.001 PCBA KEYPAD BD PB8240
27 55.J9423.001 PCBA CHIP BD PB8240
28 55.J9428.001 PCBA REAR IR BD PB8260
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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.J9428.001 ASSY CD+MANUAL PB8250
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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.
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Optional Accessories
1. Macintosh adapter
2. 250W / 300W lamp module
3. Ceiling mount kit
4. Wireless Pro
5. Presentation Pro
6. DVI-I cable
Projector Description
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