BenQ Mw870ust Users Manual

							Maintenance 81
Maintenance
Care of the projector
Your projector needs little maintenance. The only thing you need to do on a regular basis is to 
keep the lens and case clean.
Never remove any parts of the projector except the lamp. Contact your dealer if other 
parts need replacing.
Cleaning the lens
Clean the lens whenever you notice dirt or dust on the surface. 
• Use a canister of compressed air to remove dust. 
• If there is dirt or smears, use lens-cleaning paper or moisten a soft cloth with lens 
cleaner and gently wipe the lens surface.
• Never use any type of abrasive pad, alkaline/acid cleaner, scouring powder, or volatile 
solvent, such as alcohol, benzene, thinner or insecticide. Using such materials or 
maintaining prolonged contact with rubber or vinyl materials may result in damage to 
the projector surface and cabinet material.
Never rub the lens with abrasive materials.
Cleaning the projector case
Before you clean the case, turn the projector off using the proper shutdown procedure as 
described in Shutting down the projector on page 66 and unplug the power cord.
• To remove dirt or dust, wipe the case with a soft, lint-free cloth.
• To remove stubborn dirt or stains, moisten a soft cloth with water and a neutral pH 
detergent. Then wipe the case.
Never use wax, alcohol, benzene, thinner or other chemical detergents. These can damage the 
case.
Storing the projector
If you need to store the projector for an extended time, please follow the instructions below:
• Make sure the temperature and humidity of the storage area are within the 
recommended range for the projector. Please refer to Specifications on page 89 or 
consult your dealer about the range.
• Retract the adjuster feet.
• Remove the battery from the remote control.
• Pack the projector in its original packing or equivalent.
Transporting the projector
It is recommended that you ship the projector with its original packing or equivalent.
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							Maintenance
82
Lamp information
Getting to know the lamp hour
When the projector is in operation, the duration (in hours) of lamp usage is automatically 
calculated by the built-in timer. The method of calculating the equivalent lamp hour is as 
follows:
Total (equivalent) lamp hour
= 1 (hours used in Economic mode) + 4/3 (hours used in normal mode)
See Setting Lamp Mode as Economic below for more information on Economic mode.
The lamp hour in Economic mode is calculated as 3/4 of that in Normal mode. That is, using the 
projector in Economic mode helps to extend the lamp hour by 1/3.
To obtain the lamp hour information:
1. Press MENU/EXIT and then press  /  until the SYSTEM SETUP: Advanced 
menu is highlighted.
2. Press  to highlight Lamp Settings and press MODE/ENTER. The Lamp 
Settings page displays.
3. You will see the Equivalent lamp hour information displaying on the menu.
4. To leave the menu, press MENU/EXIT.
You can also get the lamp hour information on the INFORMATION menu.
Extending lamp life
The projection lamp is a consumable item. To keep the lamp life as long as possible, you can do 
the following settings via the OSD menu.
Setting Lamp Mode as Economic
Using Economic mode reduces system noise and power consumption by 20%. If the 
Economic mode is selected, the light output will be reduced and result in darker 
projected pictures.
Setting the projector in Economic mode also extends the lamp operation life. To set 
Economic mode, go into the SYSTEM SETUP: Advanced > Lamp Settings > 
Lamp Mode menu and press  / .
Setting Auto Power Off
This function allows the projector to turn off automatically if no input source is detected 
after a set period of time to prevent unnecessary waste of lamp life.
To set Auto Power Off, go into the SYSTEM SETUP: Basic > Operation Settings >Auto Power 
Off menu and press  / . The time period can be set from 5 to 30 minutes in 5-minute 
increments. If the preset time lengths are not suitable for your presentation, select Disable. The 
projector will not automatically shut down in a certain time period.
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							Maintenance 83
Timing of replacing 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.
The Lamp indicator light and Temperature warning light will light up if the lamp becomes too 
hot. See Indicators on page 87 for details.
The following lamp warning displays will remind you to change the lamp.
The warning messages below are for reference only. Please follow the actual on-screen 
instructions to prepare and replace the lamp.
StatusMessage
Install a new lamp for optimal performance. If the 
projector is normally run with Economic selected 
(see Getting to know the lamp hour on page 82), 
you may continue to operate the projector until the 
next lamp warning appears.
Press ENTER to dismiss the message.
It is strongly recommended that you replace the 
lamp at this stage. The lamp is a consumable item. 
The lamp brightness diminishes with use. This is a 
normal lamp behavior. You can replace the lamp 
whenever you notice that the brightness level has 
significantly diminished.
Press ENTER to dismiss the message.
The lamp MUST be replaced before the projector 
will operate normally.
Press ENTER to dismiss the message.
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							Maintenance
84
Replacing the lamp
• Hg - Lamp contains mercury. Manage in accordance with local disposal laws. See 
www.lamprecycle.org.
• If lamp replacement is performed while the projector is suspended upside-down from the 
ceiling, make sure that no one is underneath the lamp socket to avoid any possible injury or 
damage to the human eyes caused by fractured lamp.
• 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 severe burns, allow the projector to cool for at least 45 minutes before 
replacing the lamp.
• To reduce the risk of injuries to fingers and damage to internal components, use caution 
when removing lamp glass that has shattered into sharp pieces.
• To reduce the risk of injuries to fingers and/or compromising image quality by touching the 
lens, do not touch the empty lamp comparent when the lamp is removed.
• This lamp contains mercury. Consult your local hazardous waste regulations to dispose of 
this lamp in a proper manner.
• To assure optimal performance from the projector, it is recommended that you purchase a 
BenQ projector lamp for lamp replacement.
1. Turn the power off and disconnect the projector from the power outlet. If the lamp 
is hot, avoid burns by waiting for approximately 45 minutes until the lamp has cooled.
2. Loosen the screw on the lamp cover.
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							Maintenance 85 3. Remove the lamp cover by (a) sliding 
the cover toward the side of the 
projector and (b) lifting it off.
• Do not turn the power on with the lamp 
cover removed.
• Do not insert your fingers between the 
lamp and the projector. The sharp edges 
inside the projector may cause injuries.
4. Loosen the screws that secure the 
lamp.
5. Lift the handle so that it stands up. Use 
the handle to slowly pull the lamp out 
of the projector.
• Pulling it too quickly may cause the lamp to 
break and scatter broken glass in the 
projector.
• Do not place the lamp in locations where 
water might splash on it, children can reach 
it, or near flammable materials.
• Do not insert your hands into the projector 
after the lamp is removed. If you touch the 
optical components inside, it could cause 
color unevenness and distortion of the 
projected images.
6. Insert the new lamp into the lamp 
comparent and make sure it fits in the 
projector.
(b)
(a)
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							Maintenance
8611. Restart the projector.
Do not turn the power on with the lamp cover removed.
Resetting the lamp timer
12. After the startup logo, open the On-Screen 
Display (OSD) menu. Go to the SYSTEM 
SETUP: Advanced > Lamp Settings 
menu. Press MODE/ENTER. The Lamp 
Settings page displays. Press   to highlight 
Reset lamp timer and press MODE/
ENTER. A warning message displays asking if you want to reset the lamp timer. 
Highlight Reset and press MODE/ENTER. The lamp time will be reset to 0.
Do not reset if the lamp is not new or replaced as this could cause damage. 
7. Tighten the screws that secure the 
lamp.
• Loose screw may cause a bad connection, 
which could result in malfunction.
• Do not over tighten the screws.
8. Ensure the handle is fully laid flat and 
locked in place.
9. Replace the lamp cover by sliding it 
into place.
10. Tighten the screw that secures the 
lamp cover. 
• Loose screw may cause a bad connection, 
which could result in malfunction.
• Do not over tighten the screw.
(a)
(b)
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							Maintenance 87
Indicators
LightStatus & DescriptionPOWERTEMPLAMP
Pow e r  ev e n t s
Orange Off OffStand-by mode
Green
FlashingOff OffPowering up
Green Off OffNormal operation
Orange
FlashingOff OffNormal power-down cooling
OrangeRed
FlashingRed
FlashingDownload mode
Lamp events
Off OffRed
FlashingFirst lamp-lit error cooling
Off Off RedLamp error in normal operation
Thermal events
OffRed
Flashing 1timeOffFan 1 error( Lamp Fan)
OffRed
Flashing 2 timesOffFan 2 error(Power Fan)
OffRed
Flashing 3 timesOffFan 3 error(Burner Fan)
Off Red OffT1 temperature over
OffRed
Flashing 5HzOffThermal Sensor Fail (Not able to read 
thermal sensor value)
System error message
OffRed
FlashingDMD error
OffRed
FlashingColor wheel error
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							Troubleshooting
88
Troubleshooting
The projector does not turn on.
No picture
Blurred image
Remote control does not work
The password is incorrect
CauseRemedy
There is no power from the power cable.Plug the power cord into the AC inlet on the 
projector, and plug the power cord into the 
power outlet. If the power outlet has a switch, 
make sure that it is switched on.
Attempting to turn the projector on again 
during the cooling process.Wait until the cooling down process has 
completed.
CauseRemedy
The video source is not turned on or 
connected correctly.Turn the video source on and check that the signal 
cable is connected correctly.
The projector is not correctly connected 
to the input signal device.Check the connection.
The input signal has not been correctly 
selected.Select the correct input signal with the SOURCE 
key on the projector or remote control.
The lens cover is still closed. Open the lens cover.
CauseRemedy
The projection lens is not correctly 
focused.Adjust the focus of the lens using the focus ring.
The projector and the screen are not 
aligned properly.Adjust the projection angle and direction as well 
as the height of the unit if necessary.
The lens cover is still closed. Open the lens cover.
CauseRemedy
The battery is out of power. Replace the battery with new one.
There is an obstacle between the remote 
control and the projector.Remove the obstacle.
You are too far away from the projector. Stand within 8 meters (26 feet) of the projector.
CauseRemedy
You do not remember the password.Please see Entering the password recall 
procedure on page 33 for details.
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							Specifications 89
Specifications
All specifications are subject to change without notice. 
Optical
Resolution
1280 x 800 WXGA
Display system
1-CHIP DMD
Lens F/Number
F = 2.7 
f = 5.45 mm
Lamp
225 W lamp
Electrical
Power supply
AC100–240V, 3.20 A,
50-60 Hz (Automatic)
Power consumption
310 W (Max.)
Mechanical
We i g h t
4.1 kg (9.04 lbs.)
Output terminals
RGB output
D-Sub 15-pin (female) x 1
Speaker
(Stereo) 10 watt x 2
Audio signal output
PC audio jack x 1
Control
RS-232 serial control 
9 pin x 1
LAN controk
RJ45 x 1 (wired)
USB A type x 2 (wireless)
Screen control
12V trigger x 1 (0.5 A)
USB B type x 1
(Supports firmware upgrade/PD pen)
Input terminals
Computer input
RGB input
D-Sub 15-pin (female) x 2
Video signal input
S-VIDEO
Mini DIN 4-pin port x 1
VIDEO
RCA jack x 1
SD/HDTV signal input
Analog - Component RCA jack x 3
   (through RGB input)
Digital-HDMI x 1
Audio signal input
Audio in
PC audio jack x 1
RCA audio jack (L/R) x 2
Remote desktop /USB reader supported (USB
A type)
USB display (USB mini B type)
 
Environmental Requirements
Operating temperature
0°C-40°C at sea level
Operating relative humidity
10%-90% (without condensation)
Operating altitude
0-1499 m at 0°C-35°C
1500-3000 m at 0°C-30°C (with High Alti-
tude Mode on)
* China region only applies to an altitude of
2000m.
* The PointDraw™ pen is not sold worldwide. If you would like to purchase it, please contact 
the regional point of sale.
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							Specifications
90
Dimensions
330 mm (W) x 278 mm (H) x 154 mm (D)
Ceiling mount installation
330
278
154
62.577.5
75.0
175.0
146.0
221.0
22.0
328.0 164.0
164.0 62.589.3
116.1
163.0
Ceiling mount screws:
M4 x 8 (Max. L = 8 mm)Unit: mm
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