Benq MP770 User Manual

MP770 Digital Projector Mainstream Series User's Manual

Welcome

Copyright

Copyright 2006 by BenQ Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of BenQ Corporation.

Disclaimer

BenQ Corporation makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties, merchantability or fitness for any particular purpose. Further, BenQ Corporation reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation to notify any person of such revision or changes.

*DLP, Digital Micromirror Device and DMD are trademarks of Texas Instruments. Others are copyrights of their respective companies or organizations.

Important safety instructions.................................... 5

Introduction ............................................................... 9

Projector features ................................................................. 9

Shipping contents............................................................... 10

Projector exterior view ....................................................... 11

Controls and functions ...................................................... 12

Positioning your projector ...................................... 17

Choosing a location ........................................................... 17

Safety instructions for ceiling mounting of the projector 18

Obtaining a preferred projected image size ...................... 19

Connection............................................................... 22

Wireless connection (optional) ........................................ 22

Cable connection ............................................................... 22

Operation ................................................................. 31

Start up ............................................................................... 31

Utilizing the password function ........................................ 32

Switching input signal ....................................................... 34

Adjusting the projected image .......................................... 34

Selecting the aspect ratio.................................................... 37

Optimizing the image......................................................... 38

Operating in a high altitude environment ....................... 40

Hiding the image ............................................................... 40

PIP (Picture In Picture) operation .................................... 41

Remote paging operations ................................................. 42

Freezing the image ............................................................. 42

Creating your own startup screen .................................... 42

Personalizing the projector menu display......................... 43

Shutting down the projector ............................................. 43

Menu operation.................................................................. 44

Maintenance............................................................. 53

Care of the projector ......................................................... 53

Table of contents 3

Lamp information...............................................................56

Troubleshooting....................................................... 62

Specifications............................................................ 64

Projector specifications ......................................................64

Timing chart........................................................................65

Dimensions..........................................................................66

Warranty................................................................... 67

Limited warranty ................................................................ 67

Regulation statements.............................................. 68

FCC statement ....................................................................68

EEC statement ....................................................................68

MIC statement ....................................................................68

WEEE directive ...................................................................68

Table of contents4

Important safety instructions

Your BenQ projector is designed and tested to meet the latest standards for safety of information technology equipment. However, to ensure safe use of this product, it is important that you follow the instructions mentioned in this manual and marked on the product.

Safety Instructions

1. Please read this manual before you operate your projector. Save it for future reference.

2. Do not look straight at the projector lens during operation. The intense light beam may damage your eyes.

4. Always open the lens shutter or remove the lens cap when the projector lamp is on.

5. In some countries, the line voltage is NOT stable. This projector is designed to operate safely within a mains voltage between 100 to 240 volts AC, but could fail if power cuts or surges of ±10 volts occur. In areas where the mains voltage may fluctuate or cut out, it is recommended that you connect your projector through a power stabilizer, surge protector or uninterruptible power supply (UPS).

3. Refer servicing to qualified service personnel.

6. Do not block the projection lens with any objects when the projector is under operation as this could cause the objects to become heated and deformed or even cause a fire. To temporarily turn off the lamp, press BLANK on the projector or remote control.

Important safety instructions 5

Safety Instructions (Continued)

7. The lamp becomes extremely hot during operation. Allow the projector to cool for approximately 45 minutes prior to removing the lamp assembly for replacement.

8. Do not operate lamps beyond the rated lamp life. Excessive operation of lamps beyond the rated life could cause them to break on rare occasions.

10. Do not place this product on an unstable cart, stand, or table. The product may fall, sustaining serious damage.

11. Do not attempt to disassemble this projector. There are dangerous high voltages inside which may cause death if you should come into contact with live parts. The only user serviceable part is the lamp which has its own removable cover.

Under no circumstances should you ever undo or remove any other covers. Refer servicing only to suitably qualified professional service personnel.

9. Never replace the lamp assembly or any electronic components unless the projector is unplugged.

Important safety instructions6

Safety Instructions (Continued)

12. Do not place this projector in any of the following environments.

- Space that is poorly ventilated or confined. Allow at least 50 cm clearance from walls and free flow of air around the projector.

- Locations where temperatures may become excessively high, such as the inside of a car with all windows rolled up.

- Locations where excessive humidity, dust, or cigarette smoke may contaminate optical components, shortening the projector's life span and darkening the image.

13. Do not block the ventilation holes.

- Do not place this projector on a blanket, bedding or any other soft surface.

- Do not cover this projector with a cloth or any other item.

- Do not place inflammables near the projector.

If the ventilation holes are seriously obstructed, overheating inside the projector may result in a fire.

14. Always place the projector on a level, horizontal surface during operation.

- Do not use if tilted at an angle of more than 10 degrees left to right, nor at angle of more than 15 degrees front to back. Using the projector when it is not fully horizontal may cause a malfunction of, or damage to, the lamp.

- Locations near fire alarms

- Locations with an ambient temperature above 40°C / 104°F

- Locations where the altitudes are higher than 10000 feet.

10000

feet

15. Do not stand the projector on end vertically. Doing so may cause the projector to fall over, causing injury or resulting in damage to the projector.

Important safety instructions 7

Safety Instructions (Continued)

16. Do not step on the projector or place any objects upon it. Besides probable physical damage to the projector, doing so may result in accidents and possible injury.

17. Do not place liquids near or on the projector. Liquids spilled into the projector may cause it to fail. If the projector does become wet, disconnect it from the power supply's wall socket and call BenQ to have the projector serviced.

18. This product is capable of displaying inverted images for ceiling mount installation.

Use only BenQ's Ceiling Mount Kit for mounting the projector and ensure it is securely installed.

19. When the projector is under operation, you may sense some heated air and odor from its ventilation grill. It is a normal phenomenon and not a product defect.

Important safety instructions8

Introduction

Projector features

The projector integrates high-performance optical engine projection and a user-friendly design to deliver high reliability and ease of use.

The projector offers the following features.

• Selectable password protected function

• Off and Go function allowing presenters to unplug the projector right after the projector is turned off

• Up to 11 sets of application modes providing multiple choices for different projection purposes

• Optional wireless module allowing more computers to share one projector through cable or wireless connection

• High quality manual zoom lens

• One-key auto-adjustment to display the best picture quality

• Two-way digital keystone correction to correct distorted images

• Adjustable color balance control for data/video display

• Ultra-high brightness projection lamp

• Ability to display 16.7 million colors

• Multi-language On-Screen Display (OSD) menus

• Switchable normal and Economic modes to reduce the power consumption

• Built-in speaker provides mixed mono audio when an audio input is connected

• Powerful AV function to provide high quality video image

• Component HDTV compatibility (YP

• Replaceable dust filter

• The apparent brightness of the projected image will vary depending on the ambient lighting conditions, selected input source contrast/brightness settings, and is directly proportional to projection distance.

• The lamp brightness will decline over time and may vary within the lamp manufacturers specifications. This is normal and expected behavior.

bPr)

Introduction 9

Shipping contents

The projector is shipped with the cables required for connection to a PC or 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.

Standard accessories

The supplied accessories will be suitable for your region, and may differ from those illustrated.

Projector Soft carry case Remote control with batteries

Quick start

guide

PC audio cable Component Video to VGA (D-Sub)

User's manual

VGA cable USB cable Power cord

Optional accessories

1. Macintosh adapter

2. Spare lamp kit

3. Ceiling mount kit

Introduction10

User's manual Replacement filter

adaptor cable

4. RS232 connector

5. Wireless module

Projector exterior view

Front/upper side

3 4

Rear side

See "Connection" on page 22 for details.

1. External control panel (See "Projector" on page 12 for

details.)

2. Vent (heated air exhaust)

3. Projection lens

4. Quick-release button

5. Lens cap

6. Focus ring and Zoom ring

7. Front IR remote sensor

11 12 13 14 15 16 17 18

8. Rear adjuster foot

9. AC power cord inlet

10. Filter case

11. Rear IR remote sensor

12. USB socket

13. RS232 control port

14. RGB signal output socket

Lower/side view

19 20

15. RGB (PC)/Component video (YPbPr/ YCbCr) sign al in put socket

16. DVI-I signal input socket

17. Video input socket

18. S-Video input socket

19. Audio input socket

20. Audio output socket

21. Speaker grill

22. Quick-release foot

23. Lamp cover

24. Rear adjuster foot

25. Kensington anti-theft lock slot

Introduction 11

Controls and functions

Projector

1 2

1. Focus ring Adjusts the focus of the projected image. See "Fine-tuning the image size and

clarity" on page 35 for details.

2. Zoom ring Adjusts the size of the image. See "Fine-

tuning the image size and clarity" on page 35 for details.

3. Power indicator light Lights up or flashes when the projector is

under operation. See "Indicators" on page

60 for details.

4. MENU/BACK Turns on the On-Screen Display (OSD) menu. Goes back to previous OSD menu, exits and saves menu settings. See "Using the menus" on page 46 for details.

4 5

6 7

8 9

5. Power

Toggles the projector between standby mode and on.

When the projector is in standby mode, press once to turn the projector on. When the projector is on, press twice to turn the projector to standby.

See "Start up" on page 31 and "Shutting

down the projector" on page 43 for

details.

6. Keystone/Arrow buttons ( / Up, /

Left, / Down, / Right)

Manually corrects distorted images resulting from an angled projection. When the On-Screen Display (OSD) menu is activated, the buttons are used as directional arrows to select the desired menu items and to make adjustments.

See "Correcting keystone" on page 35 and

"Using the menus" on page 46 for details.

10 11

Introduction12

7. MODE Depending upon which input signal is

selected, selects an available picture setup mode. See "Application Mode"

on page 48 for details.

When a wireless module is installed and the Wireless Connection menu is displayed, press this button to change among LAN, IEEE 802.11 a, and IEEE

802.11 b/g. (The wireless module is available through BenQ retailers.)

8. BLANK Used to hide the screen image. To restore the image, press any button (except LASER) on the projector or remote control. See "Hiding the image"

on page 40 for details.

9. ENTER Enacts the selected On-Screen Display

(OSD) menu item. See "Using the

menus" on page 46 for details.

10. Temperature warning light Lights up red if the projector's

temperature becomes too high. See

"Indicators" on page 60 for details.

11. Lamp indicator light Indicates the status of the lamp. Lights

up or flashes when the lamp has developed a problem. See "Indicators"

on page 60 for details.

12. AUTO Automatically determines the best

picture timings for the displayed image. See "Auto-adjusting the image"

on page 35 for details.

When a wireless module is installed, the Wireless Connection menu is displayed and the IEEE 802.11 a is selected, press this button to search for a reliable channel. (The wireless module is available through BenQ retailers.)

13. SOURCE Sequentially selects the input signal D-

Sub (Analog RGB), Comp. (YPbPr), DVI-A, DVI-D, Video, or S-Video. See

"Switching input signal" on page 34 for

details.

Introduction 13

Remote control

1. Power Toggles the projector between standby

mode and on. When the projector is in standby mode, press once to turn the projector on. When the projector is on, press twice to turn the projector to standby. See "Start up" on page 31 and "Shutting

down the projector" on page 43 for

details.

2. ASPECT

Selects the display aspect ratio. See

"Selecting the aspect ratio" on page 37 for

details.

3. WIRELESS

Turns on or off the wireless connection menu. See "Wireless connection

(optional)" on page 22 for details.

4. Keystone/ Arrow buttons ( / Up, /

Left, / Down, / Right)

Manually corrects distorted images resulting from an angled projection.

When the On-Screen Display (OSD)

menu is activated, the buttons are used as directional arrows to select the desired

menu items and to make adjustments. See "Correcting keystone" on page 35 and

"Using the menus" on page 46 for details.

5. MENU/BACK

Turns on the On-Screen Display (OSD) menu.

Goes back to previous OSD menu, exits

and saves menu settings. See "Using the menus" on page 46 for details.

6. BLANK Used to hide the screen image. To restore

the image, press any button (except LASER) on the projector or remote control. See "Hiding the image" on page

40 for details.

7. ENTER Enacts the selected On-Screen Display

(OSD) menu item. See "Using the menus"

on page 46 for details.

8. CONTRAST Displays the Contrast adjustment bar. To adjust the value, press the directional arrow buttons on the projector or remote control.

Introduction14

9. BRIGHTNESS Displays the Brightness adjustment bar. To

adjust the value, press the directional arrow buttons on the projector or remote control.

10. CAPTURE Captures the projected image and save it

as your startup screen. See "Creating your

own startup screen" on page 42 for details.

11. PIP Turns the Picture In Picture (PIP) window on or off. See "PIP (Picture In Picture)

operation" on page 41 for details.

12. LED indicator light Lights red when any button on the remote

control is pressed.

13. MODE Depending upon which input signal is

selected, selects an available picture setup mode. See "Application Mode" on page 48 for details. When a wireless module is installed and the Wireless Connection menu is displayed, press this button to change among LAN, IEEE 802.11 a, and IEEE

802.11 b/g. (The wireless module is available through BenQ retailers.)

14. FREEZE

The image is frozen when FREEZE is pressed. To release the function, press any button (except LASER) on the projector or remote control. See "Freezing the

image" on page 42 for details.

15. MUTE Toggles projector audio between on and

off.

16. AUTO Automatically determines the best picture

timings for the displayed image. See

"Auto-adjusting the image" on page 35 for

details. When a wireless module is installed, the Wireless Connection menu is displayed and the IEEE 802.11 a is selected, press this button to search for a reliable channel. (The wireless module is available through BenQ retailers.)

17. SOURCE Sequentially selects the input signal D-Sub (Analog RGB), Comp. (YPbPr), DVI-A, DVI-D, Video, or S-Video. See "Switching

input signal" on page 34 for details.

18. LASER Emits visible laser pointer light for

presentation purposes. The Laser Pointer is a presentation aid for

professionals. It emits red colored light when you press it and the LED indicator lights up red.

WARNING: Do not look into the laser light

window or shine the laser light beam on yourself or others. See the warning messages on the back of the remote control and the attached ''User Information'' prior to using it.

19. DIGITAL ZOOM buttons (+, -) Magnifies or reduces the projected image size.

20 . PAG E U P a n d PAGE DOW N

Operate your display software program (on a connected PC) which responds to page up/down commands (like Microsoft PowerPoint). See "Remote paging

operations" on page 42 for details.

Warning messages on the back of the remote control

The laser beam is visible. It is necessary to press and hold LASER for continuous output.

The laser pointer is not a toy. Parents should be mindful of the dangers of laser energy and keep this remote control out of the reach of children.

Refer to the warning labels on the back of your remote control for safe operation on the laser pointer.

Introduction 15

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 perpendicular to the projector's IR remote control sensors to function correctly. The distance between the remote control and the sensors should not exceed 6 meters (~ 20 feet).

Make sure that there are no obstacles between the remote control and the IR sensors on the projector that might obstruct the infra-red beam.

• Operating the projector from the front

• Operating the projector from the rear

Remote control batteries

1. To open the battery cover, turn the remote control over to view its back, push on the finger grip on the cover and slide it up in the direction of the arrow as illustrated. The cover will slide off.

2. Remove any existing batteries (if necessary) and install two AAA batteries observing the battery polarities as indicated in the base of the battery compartment. Positive (+) goes to positive and negative (-) goes to negative.

3. Refit the cover by aligning it with the base and sliding it back down into position. Stop when it clicks into place.

• Avoid leaving the remote control and batteries in an excessive heat or humid environment

like the kitchen, bathroom, sauna, sunroom or in a closed car.

• Replace only with the same or equivalent type recommended by the battery manufacturer.

• Dispose of the used batteries according to the manufacturer's instructions and local

environment regulations for your region.

• Never throw the batteries into a fire. There may be danger of an explosion.

• If the batteries are dead or if you will not be using the remote control for an extended

period of time, remove the batteries to avoid damage to the remote control from possible battery leakage.

Introduction16

Positioning your projector

Choosing a location

Your projector is designed to be installed in one of four possible installation locations:

1. Table in front of screen;

2. Ceiling in front of screen;

3. Table at rear of screen;

4. Ceiling at rear of screen.

1. Front Table Select this location with the projector placed near the

floor in front of the screen. This is the most common way to position the projector for quick setup and portability.

2. Front Ceiling Select this location with the projector suspended

upside-down from the ceiling in front of the screen.

Purchase the BenQ Projector Ceiling Mounting Kit from your dealer to mount your projector on the ceiling.

Set

Front Ceiling in the System Setup: Basic >

Projector Position menu after you turn the projector on.

3. Rear Table Select this location with the projector placed near the

floor behind the screen.

Note that a special rear projection screen is required.

Set Rear Table in the System Setup: Basic > Projector Position menu after you turn the projector on.

4. Rear Ceiling Select this location with the projector suspended

upside-down from the ceiling behind the screen.

Note that a special rear projection screen and the BenQ Projector Ceiling Mounting Kit are required for this installation location.

Set Rear Ceiling in the System Setup: Basic > Projector Position menu after you turn the projector on.

Your room layout or personal preference will dictate which installation location you select. Take into consideration the size and position of your screen, the location of a suitable power outlet, as well as the location and distance between the projector and the rest of your equipment.

Positioning your projector 17

If you use the projector with wireless function, there's no need to worry about data cable connections.This gives you the flexibility to site the projector anywhere in the room up to a range of 20m away from your notebook, and switch between presentations on different notebooks instantly without fiddling with cables

To use the wireless function, you need to install a BenQ wireless module to the projector and enable your notebook/desktop PC with wireless connection. For more information, refer to

"Wireless connection (optional)" on page 22.

Safety instructions for ceiling mounting of the projector

We want you to have a pleasant experience using your BenQ projector, so we need to bring this safety matter to your attention to prevent damage to person and property.

If you intend to mount your projector on the ceiling, we strongly recommend that you use a proper fitting BenQ projector ceiling mount kit and that you ensure it is securely and safely installed.

If you use a non-BenQ brand projector ceiling mount kit, there is a safety risk that the projector may fall from the ceiling due to an improper attachment through the use of the wrong gauge or length screws.

You can purchase a BenQ projector ceiling mount kit from the place you purchased your BenQ projector. BenQ recommends that you also purchase a separate Kensington lock compatible security cable and attach it securely to both the Kensington lock slot on the projector and the base of the ceiling mount bracket. This will perform the secondary role of restraining the projector should its attachment to the mounting bracket become loose.

Positioning your projector18

Obtaining a preferred projected image size

The distance from the projector lens to the screen, the zoom setting, and the video format each factors in the projected image size.

The maximum (native) resolution of the projector is 1024 x 768 pixels, which is a 4 to 3 aspect ratio (expressed as 4:3). To be able to project a complete 16:9 (widescreen) aspect ratio image, the projector can resize and scale a widescreen image to the projector's native aspect width. This will result in a proportionally smaller height equivalent to 75% of the projector's native aspect height.

4:3 aspect image in a 4:3 aspect display area

Thus, a 16:9 aspect image will not utilize 25% of the height of a 4:3 aspect image displayed by this projector. This will be seen as darkened (unlit) bars along the top and bottom (vertical 12.5% height respectively) of the 4:3 projection display area whenever displaying a scaled 16:9 aspect image in the vertical center of the 4:3 projection display area.

When determining the position of your projector, you should consider its intended use and input signal aspect ratios. All inputs (other than composite Video being fed a 16:9 aspect signal) will display in a 4:3 aspect ratio (and will require an additional 33% display height than that of the scaled 16:9 aspect image projection area).

IMPORTANT: Do not select a permanent projector position based upon a 16:9 projection if you will ever need to select an input (other than composite Video being fed a 16:9 aspect signal).

The projector should always be placed horizontally level (like flat on a table), and positioned directly perpendicular (90° right-angle square) to the horizontal center of the screen. This prevents image distortion caused by angled projections (or projecting onto angled surfaces).

The modern digital projector does not project directly forward (like older style reel-to-reel film projectors did). Instead, digital projectors are designed to project at a slightly upward angle above the horizontal plane of the projector. This is so that they can be readily placed on a table and will project forward and upwards onto a screen positioned so that the bottom edge of the screen is above the level of the table (and everyone in the room can see the screen).

If the projector is mounted on a ceiling, it must be mounted upside-down so that it projects at a slightly downward angle.

You can see from the diagram on page 21, that this type of projection causes the bottom edge of the projected image to be vertically offset from the horizontal plane of the projector. When ceiling mounted, this refers to the top edge of the projected image.

If the projector is positioned further away from the screen, the projected image size increases, and the vertical offset also increases proportionately.

When determining the position of the screen and projector, you will need to account for both the projected image size and the vertical offset dimension, which are directly proportional to the projection distance.

BenQ has provided a table of 4:3-aspect-ratio screen sizes to assist you in determining the ideal location for your projector. There are two dimensions to consider, the perpendicular horizontal distance from the center of the screen (projection distance), and the vertical offset height of the projector from the horizontal edge of the screen (offset).

16:9 aspect image scaled to a 4:3 aspect

display area

Positioning your projector 19

How to determine the position of the projector for a given screen size

1. Select your screen size.

2. Refer to the table and find the closest match to your screen size in the left columns labelled '4:3 Screen Diagonal'. Using this value, look across this row to the right to find the corresponding average distance from screen value in the column labelled 'Average'. This is the projection distance.

3. On that same row, look across to the right column and make note of the vertical Offset value. This will determine the final vertical offset placement of the projector in relation to the edge of the screen.

4. The recommended position for the projector is aligned perpendicular to the horizontal center of the screen, at the distance from the screen determined in step 2 above, and offset by the value determined in step 3 above.

For example, if you are using a 120 inch screen, the average projection distance is 4432 mm and with a vertical offset of 302 mm.

If you place the projector in a different position (to that recommended), you will have to tilt it down or up to center the image on the screen. In these situations, some image distortion will occur. Use the Keystone function to correct the distortion. See "Correcting keystone" on

page 35 for details.

How to determine the recommended screen size for a given distance

This method can be used for situations where you have purchased this projector and would like to know what screen size will fit in your room.

The maximum screen size is limited by the physical space available in your room.

1. Measure the distance between the projector and where you want to position the screen. This is the projection distance.

2. Refer to the table and find the closest match to your measurement in the average distance from screen column labelled 'Average'. Check that your measured distance is between the min and max distances listed on either side of the average distance value.

3. Using this value, look across that row to the left to find the corresponding screen diagonal listed in that row. That is the projected image size of the projector at that projection distance.

4. On that same row, look across to the right column and make note of the vertical Offset value. This will determine the final placement of the screen in relation to the horizontal plane of the projector.

For example, if your measured projection distance was 4.8m (4800mm), the closest match in the Average column is 5089 mm. Looking across this row shows that a 3500 mm (3.5 m) screen is required. If you can only obtain imperial sized screens, the listed screen sizes on either side of the 3.5 m screen are the 10' and 12' screens.

Checking the min and max projection distance values for these screen sizes, indicates that the 4.8 m measured projection distance will need to be reduced to fit the 10' size screen, or increased to fit the 12' size screen. The projector can be adjusted (using the zoom control) to display on these different screen sizes at those projection distances. Be aware that these different screens have different vertical offset values.

Positioning your projector20

Maximum zoom

Minimum zoom

Screen

Center of lens

Offset

Projection distance

4:3 Screen Diagonal Distance from Screen in mm Vertical Offset in mm

Feet Inches mm Min length

(with max.

zoom)

4 48 1219 1652 1773 1893 121

1500 2033 2181 2329 149 5 60 1524 2065 2216 2367 151 6 72 1829 2479 2659 2840 181

2000 2710 2908 3106 198 7 84 2134 2892 3102 3313 211 8 96 2438 3305 3546 3787 241

2500 3389 3635 3882 248 9 108 2743 3718 3989 4260 272

3000 4066 4362 4659 297

10 120 3048 4131 4432 4733 302

3500 4743 5089 5435 347

12 144 3658 4957 5318 5680 362

4000 5421 5816 6212 396

15 180 4572 6196 6648 7100 453

5000 6776 7270 7765 495

18 216 5486 7436 7978 8520 543

6000 8132 8725 9317 594

25 300 7620 10327 11080 11833 754

Averag e Max length

(with min.

zoom)

There is 3% tolerance among these numbers due to optical component variations. BenQ recommends that if you intend to permanently install the projector, you should physically test the projection size and distance using the actual projector in situ before you permanently install it, so as to make allowance for this projector's optical characteristics. This will help you determine the exact mounting position so that it best suits your installation location.

Positioning your projector 21

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