BenQ Projector TH670 User Manual

							Operation 31
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 20 on page 10 for 
details.
A Kensington security cable lock is usually a combination of key(s) and the lock. Refer 
to the locks 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 power-on lock 
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, the projector cannot be used unless the correct 
password is entered every time the projector is started.
1. Open the OSD menu and make sure the Menu Type is Advanced. See Using 
the menus on page 28 for details.
2. Go to the System Setup: Advanced > Password > Change Password 
menu, and press OK on the projector or remote control.
3. Enter the new or current password. 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. 
4. Confirm the new password by re-entering the 
new password. Once the password is set, the 
OSD menu returns to the Password page.
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. Press   to select Pow e r  O n  L o c k and select On by pressing  / .
6. To leave the OSD menu, press MENU on the projector or remote control. 
						

							Operation
32
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 three seconds, and 
the message ‘Input Current Password’ 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 32 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 make sure the Menu Type is Advanced. See Using 
the menus on page 28 for details.
2. Go to the System Setup: Advanced > Password > Change Password 
menu, and press OK on the projector or remote control.
3. The message ‘Input Current Password’ 
displays.
4. Enter the old password.
• If the password is correct, another 
message Input New Password displays. 
• 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 BACK on the projector or the 
remote control to cancel the change or 
try another password.
5. 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: __ __ __ __ __ __ 
						

							Operation 33
Keep this manual in a safe place.
6. Confirm the new password by re-entering the new password.
7. You have successfully assigned a new password to the projector. Remember to 
enter the new password next time the projector is started.
8. To leave the OSD menu, press 
MENU on the projector or remote control.
Disabling the password function
To disable password protection, go back to the System Setup: Advanced > 
Password > Power On Lock menu and press OK on the projector or the remote 
control. The message Input Password displays. Enter the current password.
• If the password is correct, the OSD menu returns to the Power On Lock 
with the highlight of Off.
• 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 BACK 
on the projector or remote control 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 Auto Source* function is On (which is the default of this projector) if 
you want the projector to automatically search for the signals.
*You can set Auto Source function in the Basic menu when the projector is 
without input signal or in the Advanced menu > System Setup: Basic menu.
You can also manually cycle through the available input signals.
1. Press SOURCE on the projector or 
remote control. A source selection bar 
displays.  
						

							Operation
342. Press  /  until your desired signal is selected 
and press OK on the projector or remote 
control. 
Once detected, the selected source information 
will display on 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 input signal type effects the options available for the Picture Mode. See 
Selecting a picture mode on page 36 for details.
• The native display resolution is in a 16:9 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 34 for details.
Selecting the aspect ratio
The aspect ratio is the ratio of the image width to the image height.
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 image ratio (no matter what aspect the source is):
1. Open the OSD menu and make sure the Menu Type is Advanced. See Using 
the menus on page 28 for details.
2. Go to the Display > Aspect Ratio menu.
3. Press  /  to select an aspect ratio to suit the format of the video signal and 
your display requirements. 
						

							Operation 35
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.
2.4:3: Scales a picture so that it is displayed in the 
center of the screen with a 4:3 aspect ratio. This is 
most suitable for 4:3 pictures like computer 
monitors, standard definition TV and 4:3 aspect 
DVD movies, as it displays them without aspect 
alteration.
3.16:9: 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.
4.Wide: Stretches the picture horizontally in a non-
linear manner, that is, the edges of the picture are 
stretched more than the center of the picture to 
prevent distortion of the central part of the 
picture. This is suitable for occasions where you 
want to stretch the width of a 4:3 aspect picture to the width of a 16:9 aspect screen. 
It does not alter the height. Some widescreen movies have been produced with their 
width squashed down to the width of a 4:3 aspect, and are best viewed when 
restretched back to their original width using this setting.
5.Letter Box (LB): Scales a picture to fit the 
projector’s native resolution in its horizontal width 
and resize the picture’s height to the 3/4 of the 
projection width. This may produce a picture 
greater in height than can be displayed, so part of 
the picture is lost (not displayed) along the top and 
bottom edges of the projection. This is suitable for 
the display of movies which are presented in letter 
box format (with black bars on the top and 
bottom).
4:3 picture
16:9 picture
4:3 picture
16:9 picture
4:3 picture
16:9 picture
Letter Box
format picture 
						

							Operation
36
Optimizing the image
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 on the projector or remote 
control repeatedly until your desired mode 
is selected.
•Go to the Picture Mode menu (which is in the Basic menu when the projector 
is with input signal or in the Advanced menu > Picture menu) and press  /  
to select a desired mode.
The picture modes are listed below.
1.Bright 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.Vivid mode (Default): Is designed for presentations. The brightness is 
emphasized in this mode.
3.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.
4.Game mode: Is appropriate for playing games.
5.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 36 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/
User 2) as a starting point and customize the settings.
1. Open the OSD menu and go to the Picture Mode function.
2. Press  /  to select User 1 or User 2.
3. Press  to select User Mode Management.
This function is only available when User 1 or User 2 mode is selected up in the 
Picture Mode sub-menu item.
4. Press  /  to select a picture mode that is closest to your need.
5. Press  to select a sub-menu item to be changed and adjust the value with  /
. See Fine-tuning the image quality below for details.
6. The settings will be saved when selecting. 
						

							Operation 37
Renaming user modes
You can change User 1 and User 2 to the names easy to be identified or understood 
by the users of this projector. The new name can be up to 12 characters including 
English letters (A-Z, a-z), digits (0-9), and space (_).
To rename user modes:
1. Make sure the Menu Type is Advanced. See Using the menus on page 28 for 
details.
2. Go to the Picture > Picture Mode > User 1 or User 2 menu. 
3. Go to the User Mode Management > Rename User Mode and press OK 
on the projector or remote control.
4. Press / to select the item you want to rename and press OK on the projector 
or remote control
. The first letter will be highlighted by a white box.
5. Press / to select the first character.
6. Press   to move along until the new name is set and press 
OK on the projector 
or remote control
 to confirm.
7. Repeat steps 4-6 if you want to change the other names.
Resetting current picture mode
All of the adjustments you’ve done in the Advanced menu > Picture menu (except for 
the Picture Mode) can be returned to the factory preset values with a key press on the 
selection of Reset.
To reset the picture mode to the preset factory values:
1. In the Picture menu, select Picture Mode and press  /  to select the picture 
mode (including 
User 1 or User 2) you want to reset.
2. Press  to select Reset Current Picture Mode and press 
OK on the projector 
or remote control
. The confirmation message displays.
3. Press /  to select Reset and press 
OK on the projector or remote control. 
The picture mode will return to the factory preset settings.
4. Repeat steps 1-3 if you want to reset other picture modes.
Do not to be confused with the Reset Current Picture Mode function here with the 
Reset All Settings (which is in the Basic menu when the projector is without input 
signal or in the Advanced menu > System Setup: Advanced menu). The Reset All 
Settings function returns most of the settings to the factory preset values system 
wide. See Reset All Settings on page 58 for details.
Using Wall Color Correction
In the situation where you are projecting onto a colored surface such as a painted wall 
which may not be white, the Wall Color Correction feature can help correct the 
projected picture’s color to prevent possible color difference between the source and 
projected pictures.
To use this function, go to the Advanced menu > Display > Wall Color 
Correction menu and press  /  to select a color which is the closest to the color 
of the projection surface. There are several precalibrated colors to choose from: 
Light Yellow, Pink, Light Green and Blue.
Fine-tuning the image quality 
						

							Operation
38According to the detected signal type, there are some user-definable functions 
available when User 1 or User 2 mode is selected. Based on your needs, you can 
make adjustments to these functions by selecting 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.
You can also adjust Brightness, Contrast or 
Sharpness  
by using  BRIGHT, CONTRAST or SHARP keys on the 
remote control.
+50+30+70+50+30+70
0+30
-30 
						

							Operation 39
Advanced picture quality controls
There are more advanced functions in the Advanced menu > Picture > Advanced... 
menu to be adjusted to your preference. To save the settings, just press MENU to leave 
the OSD menu.
Setting Black Level
Select Black Level and press  /  on the projector or remote control to select 0 IRE 
or 7.5 IRE.
The grayscale video signal is measured in IRE units. In some areas which use NTSC TV 
standard, the grayscale is measured from 7.5 IRE (black) to 100 IRE (white); however, in 
other areas where PAL equipment or Japanese NTSC standards are used, the grayscale is 
measured from 0 IRE (black) to 100 IRE (white). We suggest that you check the input 
source to see if it is with 0 IRE or 7.5 IRE, then select accordingly.
Selecting a Gamma Selection
Select Gamma Selection in the Advanced menu > Picture > Advanced... menu and 
select the modes by pressing  /  on the projector or remote control.
Choose a preferred gamma mode from among 1.6/1.8/2.0/2.2/2.4/2.5/2.6/2.8/BenQ.
Gamma Correction enables adjustment to the light intensity (brightness) of an image in 
order to match the source more closely.
Adjusting Brilliant Color
Select Brilliant Color in the Advanced menu > Picture > Advanced... menu and 
select the modes by pressing  /  on the projector or remote control.
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.
Selecting a Color Temperature
Select Color Temperaturein the Advanced menu > Picture > Advanced... menu 
and adjust the values by pressing / on the projector or remote control.
There are several color temperature settings available.
1. Lamp Native: With the lamp’s original color temperature and higher brightness.
This setting is suitable for environments where high brightness is required, such 
as projecting pictures in well lit rooms.
2. Warm: Makes pictures appear reddish white.
3. Normal: Maintains normal colorings for white.
4. Cool: Makes pictures appear bluish 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. 
						

							Operation
40
Setting a preferred color temperature
Select Color Temperature Fine Tuning in the Advanced menu > Picture > 
Advanced... menu and press OK on the projector or remote control.
1. Select Color Temperature and select Cool, Normal, Lamp Native or Warm 
by pressing  /   on the projector or remote control.
2. Got to Advanced... > Color Temperature Fine Tuning and press OK on 
the projector or remote control. 
3. Press  /  to select the item you want to change and adjust the values by 
pressing / .
• R Gain/G Gain/B Gain: Adjusts the contrast levels of Red, Green, and Blue.
• R Offset/G Offset/B Offset: Adjusts the brightness levels of Red, Green, and 
Blue.
4. Press MENU on the projector or remote control to exit and save the settings.
Color Management
In most installation situations, color management will not be necessary, such as in 
classroom, meeting room, or lounge room situations where lights remain on, or 
where building external windows allow daylight into the room. 
Only in permanent installations with controlled lighting levels such as boardrooms, 
lecture theaters, or home theaters, should color management be considered. Color 
management provides fine color control adjusent to allow for more accurate color 
reproduction, should you require it.
Proper color management can only be achieved under controlled and reproducible 
viewing conditions. You will need to use a colorimeter (color light meter), and 
provide a set of suitable source images to measure color reproduction. These tools 
are not provided with the projector, however, your projector supplier should be able 
to provide you with suitable guidance, or even an experienced professional installer.
The Color Management provides six sets (RGBCMY) of colors to be adjusted. 
When you select each color, you can independently adjust its range and saturation 
according to your preference.
If you have purchased a test disc which contains various color test patterns and can be 
used to test the color presentation on monitors, TVs, projectors, etc. You can project 
any image from the disc on the screen and enter the Color Management menu to 
make adjusents.
To adjust the settings:
1. Go to the 
Advanced menu > Picture >Advanced... menu and select Color 
Management.
2. Press OK on the projector or remote control and the Color Management 
page displays.
3. Select Primary Color and press  /  to select a color from among Red, 
Yellow, Green, Cyan, Blue, or Magenta.