BenQ Projector MX823ST User Manual

							Operation 21
Adjusting the projected image
Adjusting the projection angle
To adjust the projector:
1. Press the quick-release button and lift the front 
of the projector. Once the image is positioned 
where you want it, release the quick-release 
button to lock the foot in position. 
2. Screw the rear adjuster foot to fine-tune the 
horizontal angle.
To retract the foot, hold up the projector while pressing 
the quick-release button, then slowly lower the projector. 
Screw the rear adjuster foot in a reverse direction.
If the projector is not placed on a flat surface or the 
screen and the projector are not perpendicular to 
each other, the projected image becomes trapezoidal. 
To correct this situation, see Correcting keystone 
on page 22 for details.
Auto-adjusting the image
In some cases, you may need to optimize the picture quality. To do this, press AUTO on 
the projector or remote control. Within 3 seconds, the built-in Intelligent Auto 
Adjustment function will re-adjust the values of Frequency and Clock to provide the best 
picture quality. 
The current source information will be displayed in the corner of the screen for 3 seconds.
This function is only available when PC signal (analog RGB) is selected.
Fine-tuning the image clarity
Sharpen the image by rotating the focus ring.
21
Do not look into the lens while the 
lamp is on. The strong light from the 
lamp may cause damage to your eyes.
Be careful when you press the quick-
release button as it is close to the 
exhaust vent where hot air comes 
from. 
						

							Operation 22
Correcting keystone
Keystoning refers to the situation where the projected image is noticeably wider at either 
the top or bottom. It occurs when the projector is not perpendicular to the screen. 
To correct this, follow ONE of these steps:
•  Press  /  on the projector or remote 
control to display the Keystone correction page. 
Press   to correct keystoning at the top of 
the image. Press   to correct keystoning at 
the bottom of the image.
•  Using the OSD menu
1. Press MENU/EXIT and then press  /  until the DISPLAY menu is highlighted.
2. Press  to highlight Keystone and press MODE/ENTER. The Keystone 
correction page displays.
3. Press   to correct keystoning at the top of the image. Press   to correct 
keystoning at the bottom of the image.
Press/.Press /. 
						

							Operation 23
Using the menus
The projector is equipped with On-Screen Display (OSD) menus for making various 
adjustments and settings.
The OSD screenshots below are for reference only, and may differ from the actual design.
Below is the overview of the OSD menu.
The following example describes how to set the OSD language.
1. Press MENU/EXIT on the projector or 
remote control to turn the OSD menu on.3. Press  to highlight Language 
and press MODE/ENTER.
2. Use  /  to highlight the SYSTEM 
SETUP: Basic menu.4. Press  /// to select a 
preferred language and press 
MODE/ENTER.
5. Press MENU/EXIT on the 
projector or remote control to 
leave and save the settings.
Current input signal
Main menu icon
Main menu
Sub-menu
Highlight
Press MENU/
EXIT to the 
previous 
page or to 
exit. Status
DISPLAYWall Color
Aspect Ratio
Position
Phase
H. Size
Digital Zoom
3DOff
Auto
0
0
ENTER
MENU Exit
Analog RGB
Teaching Template
Keystone
DISPLAYWall Color
Aspect Ratio
Phase
H. Size
Digital Zoom
3D Position
Analog RGBOff
Auto
0
0
MENUExit
Teaching Template Keystone
SYSTEM SETUP: BasicPresentation Timer
Language
Projector Installation
Operation Settings
Panel Key Lock
Splash Screen Background Color
Analog RGB
MENUExit
Front Table
Off
BenQ
BenQMenu Settings
Remote Receiver Front+Rear
ENTER
SYSTEM SETUP: BasicPresentation Timer
Language
Projector Installation
Operation Settings
Panel Key Lock
Splash Screen Background Color
Analog RGB
MENUExit
Front Table
Off
BenQ
BenQ Menu Settings
Remote Receiver
Front+Rear 
						

							Operation 24
Securing the projector
Using a security cable lock
The projector has to be installed in a safe place to prevent theft. Otherwise, purchase a 
lock, such as the Kensington lock, to secure the projector. You can locate a Kensington 
lock slot on the rear side of the projector. See item 22 on page 9 for details.
A Kensington security cable lock is usually a combination of key(s) and the lock. Refer to 
the lock’s documentation for finding out how to use it.
Utilizing the password function
For security purposes and to help prevent unauthorized use, the projector includes an 
option for setting up password security. The password can be set through the On-Screen 
Display (OSD) menu.
WARNING: You will be inconvenienced if you activate the password functionality and subsequently forget the 
password. Print out this manual (if necessary) and write the password you used in this manual, and keep the 
manual in a safe place for later recall.
Setting a password
Once a password has been set and the power on lock is activated, the projector cannot be used unless the 
correct password is entered every time the projector is started.
1. Open the OSD menu and go to the SYSTEM SETUP: Advanced > Security 
Settings menu. Press MODE/ENTER. The Security Settings page displays.
2. Highlight Change Security Settings and press MODE/ENTER.
3. As pictured to the right, the four arrow keys 
(, , , ) respectively represent 4 digits 
(1, 2, 3, 4). According to the password you 
desire to set, press the arrow keys to enter six 
digits for the password.
Do not press the numeric buttons when asked to enter the 
password.
4. Confirm the new password by re-entering the 
new password.
Once the password is set, the OSD menu returns to the Security Settings page.
5. To activate the Power On Lock function, press  /  to highlight Power On Lock 
and press  /  to select On. When the Power On Lock function is activated, 
you have to enter the correct password to turn on the projector.
IMPORTANT: The digits being input will display as asterisks on-screen. Write your selected password down 
here in this manual in advance or right after the password is entered so that it is available to you should you 
ever forget it.
Password: __ __ __ __ __ __
Keep this manual in a safe place.
6. To leave the OSD menu, press MENU/EXIT.
INPUT NEW PASSWORD
Back MENU 
						

							Operation 25
If you forget the password
If the password function is activated, you will be asked 
to enter the six-digit password every time you turn on 
the projector. If you enter the wrong password, the 
password error message as pictured to the right 
displays lasting for 3 seconds, and the INPUT 
PA S S WO R D message follows. You can retry by 
entering another six-digit password, or if you did not 
record the password in this manual, and you absolutely do not remember it, you can use 
the password recall procedure. See Entering the password recall procedure on page 25 
for details.
If you enter an incorrect password 5 times in succession, the projector will automatically 
shut down in a short time.
Entering the password recall procedure
1. Press and hold AUTO on the projector or 
remote control for 3 seconds. The 
projector will display a coded number on 
the screen.
2. Write down the number and turn off your 
projector.
3. Seek help from the local BenQ service 
center to decode the number. You may be 
required to provide proof of purchase 
documentation to verify that you are an 
authorized user of the projector.
Changing the password
1. Open the OSD menu and go to the SYSTEM SETUP: Advanced> Security 
Settings > Change Password menu.
2. Press MODE/ENTER. The message “INPUT CURRENT PASSWORD” 
appears.
3. Enter the old password.
i. If the password is correct, another message “INPUT NEW PASSWORD” 
displays. 
ii. If the password is incorrect, the password error message displays lasting for 
three seconds, and the message “INPUT CURRENT PASSWORD” displays 
for your retry. You can press MENU/EXIT to cancel the change or try another 
password.
4. Enter a new password.
IMPORTANT: The digits being input will display as asterisks on-screen. Write your selected password down 
here in this manual in advance or right after the password is entered so that it is available to you should you 
ever forget it.
Password: __ __ __ __ __ __
Keep this manual in a safe place.
5. Confirm the new password by re-entering the new password.
6. You have successfully assigned a new password to the projector. Remember to enter 
the new password next time the projector is started.
7. To leave the OSD menu, press MENU/EXIT.
Password Error
Please try again.
Please write down the recall code,
and contact BenQ
Customer Center.
Recall Code:
255  255  255  255
RECALL PASSWORD
Exit MENU 
						

							Operation 26
Disabling the password function
To disable password protection, go back to the SYSTEM SETUP: Advanced > 
Security Settings > Change Security Settings menu after opening the OSD menu 
system. Press MODE/ENTER. The message “INPUT PASSWORD” displays. Enter 
the current password. 
i. If the password is correct, the OSD menu returns to the Security Settings 
page.
Press   to highlight Power On Lock and press  /  to select Off. You will 
not have to enter the password next time when turning on the projector.
ii. If the password is incorrect, the password error message displays lasting for 
three seconds, and the message “INPUT PASSWORD” displays for your 
retry. You can press MENU/EXIT to cancel the change or try another 
password.
Though the password function is disabled, you need to keep the old password in hand should you ever need to 
re-activate the password function by entering the old password.
Switching input signal
The projector can be connected to multiple devices at the same time. However, it can only 
display one full screen at a time. When starting up, the projector automatically searches for 
the available signals.
Be sure the Quick Auto Search function in the SOURCE menu is On if you want the 
projector to automatically search for the signals.
To select the source:
1. Press SOURCE on the projector or remote 
control. A source selection bar displays. 
2. Press / until your desired signal is selected 
and press MODE/ENTER.
Once detected, the selected source information 
will display at the corner of the screen for 
seconds. If there is multiple equipment 
connected to the projector, repeat steps 1-2 to 
search for another signal.
•  The brightness level of the projected image will change 
accordingly when you switch between different input signals. 
Data (graphic) PC presentations using mostly static images 
are generally brighter than Video using mostly moving 
images (movies).
•  The native display resolution of this projector is in a 4:3 
(MX823ST)/16:10 (MW824ST) aspect ratio. For best display picture results, you should select and use an 
input signal which outputs at this resolution. Any other resolutions will be scaled by the projector 
depending upon the “aspect ratio” setting, which may cause some image distortion or loss of picture 
clarity. See Selecting the aspect ratio on page 27 for details.
Changing Color Space
In the unlikely event that you connect the projector to a DVD player via the projector’s 
HDMI/MHL input and the projected picture displays wrong colors, please change the 
color space to YUV.
To  d o  t h i s :
1. Press MENU/EXIT and then press  /  until the SOURCE menu is highlighted.
Computer1/YPbPr1
Computer2/YPbPr2
HDMI/MHL
Video
S-Video
Network Display 
						

							Operation 27 2. Press   to highlight Color Space Conversion and press  /  to select a suitable 
color space.
This function is only available when the HDMI/MHL-input port is in use.
Magnifying and searching for details
If you need to find the details on the projected picture, magnify the picture. Use the 
direction arrow keys for navigating the picture.
•  Using the remote control
1. Press ZOOM+/ZOOM- to display the Zoom bar. Press ZOOM+ to magnify the 
center of the picture. Press the key repeatedly until the picture size is suitable for 
your need.
2. Use the directional arrows ( ,  ,  ,  ) on the projector or remote control to 
navigate the picture.
3. To restore the picture to its original size, press AUTO. You can also press ZOOM-
. When the key is pressed again, the picture is further reduced until it is restored to 
the original size.
•  Using the OSD menu
1. Press MENU/EXIT and then press  /  until the DISPLAY menu is highlighted.
2. Press
  to highlight Digital Zoom and press MODE/ENTER. The Zoom bar 
displays.
3. Press   repeatedly to magnify the picture to a desired size.
4. To navigate the picture, press MODE/ENTER to switch to the panning mode and 
press the directional arrows ( ,  ,  ,  ) on the projector or remote control to 
navigate the picture.
5. To reduce size of the picture, press MODE/ENTER to switch back to the zoom in/
out function, and press AUTO to restore the picture to its original size. You can 
also press   repeatedly until it is restored to the original size.
The picture can only be navigated after it is magnified. You can further magnify the picture while searching for 
details.
Selecting the aspect ratio
The “aspect ratio” is the ratio of the image width to the image height. Most analog TV and 
some computers are in 4:3 ratio, and digital TV and DVDs are usually in 16:9 ratio.
With the advent of digital signal processing, digital display devices like this projector can 
dynamically stretch and scale the image output to a different aspect than that of the image 
input signal.
To change the projected picture ratio (no matter what aspect the source is):
•  Using the remote control
1. Press ASPECT to show the current setting.
2. Press ASPECT repeatedly to select an aspect ratio to suit the format of the video 
signal and your display requirements.
•  Using the OSD menu
1. Press MENU/EXIT and then press  /  until the DISPLAY menu is highlighted.
2. Press
  to highlight Aspect Ratio.
3. Press  /  to select an aspect ratio to suit the format of the video signal and your 
display requirements. 
						

							Operation 28
About the aspect ratio
•  In the pictures below, the black portions are inactive areas and the white portions are active areas.
•  OSD menus can be displayed on those unused black areas.
1.Auto: Scales an image proportionally 
to fit the projectors native resolution 
in its horizontal or vertical width. This 
is suitable for the incoming image 
which is neither in 4:3 nor 16:9 and 
you want to make most use of the 
screen without altering the images 
aspect ratio.
2.Real
: The image is projected as its 
original resolution, and resized to fit 
within the display area. For input 
signals with lower resolutions, the 
projected image will display smaller 
than if resized to full screen. You 
could adjust the zoom setting or 
move the projector towards the 
screen to increase the image size if 
necessary. You may also need to 
refocus the projector after making 
these adjustments.
3.4:3: Scales an image so that it is 
displayed in the center of the screen 
with a 4:3 aspect ratio. This is most 
suitable for 4:3 images like some 
computer monitors, standard 
definition TV and 4:3 aspect DVD 
movies, as it displays them without 
aspect alteration.
4.16:9: Scales an image so that it is 
displayed in the center of the screen 
with a 16:9 aspect ratio. This is most 
suitable for images which are already 
in a 16:9 aspect, like high definition 
TV, as it displays them without aspect 
alteration.
5.16:10: Scales an image so that it is 
displayed in the center of the screen 
with a 16:10 aspect ratio. This is most 
suitable for images which are already 
in a 16:10 aspect, as it displays them 
without aspect alteration.
15:9 picture
MX823STMW824ST
4:3 picture
16:9 picture
4:3 picture
16:9 picture
16:10 picture 
						

							Operation 29
Optimizing the image
Using Wall Color
In the situation where you are projecting onto a colored surface such as a painted wall 
which may not be white, the Wall Color feature can help correct the projected picture’s 
colors to prevent possible color difference between the source and projected pictures.
To use this function, go to the DISPLAY > Wall Color menu and press  /  to select 
a color which is closest to the color of the projection surface. There are several 
precalibrated colors to choose from: Light Yellow, Pink, Light Green, Blue, and 
Blackboard.
Selecting a picture mode
The projector is preset with several predefined picture modes so that you can choose one 
to suit your operating environment and input signal picture type.
To select an operation mode that suits your need, you can follow one of the following 
steps.
• Press MODE/ENTER on the projector or remote control repeatedly until your 
desired mode is selected.
•  Go to the PICTURE > Picture Mode menu and press  /  to select a desired 
mode.
1.Dynamic mode: Maximizes the brightness of the projected image. This mode is 
suitable for environments where extra-high brightness is required, such as using the 
projector in well lit rooms.
2.Presentation mode: Is designed for presentations. The brightness is emphasized in 
this mode to match PC and notebook coloring.
3.sRGB mode: Maximizes the purity of RGB colors to provide true-to-life images 
regardless of brightness setting. It is most suitable for viewing photos taken with an 
sRGB compatible and properly calibrated camera, and for viewing PC graphic and 
drawing applications such as AutoCAD.
4.Cinema mode: Is appropriate for playing colorful movies, video clips from digital 
cameras or DVs through the PC input for best viewing in a blackened (little light) 
environment.
5.3D mode: Is appropriate for playing 3D images and 3D video clips.
6.User 1/User 2 mode: Recalls the settings customized based on the current 
available picture modes. See Setting the User 1/User 2 mode on page 29 for details.
Setting the User 1/User 2 mode
There are two user-definable modes if the current available picture modes are not suitable 
for your need. You can use one of the picture modes (except the User 1/2) as a starting 
point and customize the settings.
1. Press MENU/EXIT to open the On-Screen Display (OSD) menu.
2. Go to the PICTURE > Picture Mode menu.
3. Press / to select User 1 or User 2.
4. Press  to highlight Reference Mode.
This function is only available when User 1 or User 2 mode is selected up in the Picture Mode sub-menu 
item.
5. Press / to select a picture mode that is closest to your need. 
						

							Operation 306. Press  to select a menu item to be changed and adjust the value with /. See 
Fine-tuning the image quality in user modes below for details.
Fine-tuning the image quality in user modes
According to the detected signal type and selected picture mode, some of the below 
functions may not be available. Based on your needs, you can make adjustments to these 
functions by highlighting them and pressing  /  on the projector or remote control.
Adjusting Brightness
The higher the value, the brighter the image. And the 
lower the setting, the darker the image. Adjust this 
control so the black areas of the image appear just as 
black and that detail in the dark areas is visible.
Adjusting Contrast
The higher the value, the greater the contrast. Use this 
to set the peak white level after you have previously 
adjusted the Brightness setting to suit your selected 
input and viewing environment.
Adjusting Color
Lower setting produces less saturated colors. If the setting is too high, colors on the image 
will be overpowering, which makes the image unrealistic.
Adjusting Tint
The higher the value, the more reddish the picture becomes. The lower the value, the 
more greenish the picture becomes.
Adjusting Sharpness
The higher the value, the sharper the picture becomes. The lower the value, the softer the 
picture becomes.
Adjusting Brilliant Color
This feature utilizes a new color-processing algorithm and system level enhancements to 
enable higher brightness while providing truer, more vibrant colors in picture. It enables a 
greater than 50% brightness increase in mid-tone images, which are common in video and 
natural scenes, so the projector reproduces images in realistic and true colors. If you 
prefer images with that quality, select On. If you don’t need it, select Off.
When Off is selected, the Color Temperature function is not available.
Selecting a Color Temperature
The options available for color temperature* settings vary according to the signal type 
selected.
1.Cool: Makes images appear bluish white.
2.Normal: Maintains normal colorings for white.
3.Warm: Makes images appear reddish white.
*About color temperatures:
There are many different shades that are considered to be white for various purposes. 
One of the common methods of representing white color is known as the “color 
temperature”. A white color with a low color temperature appears to be reddish white. A 
white color with a high color temperature appears to have more blue in it.
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