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...

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....

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...

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...

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...

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...

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...

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...

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...

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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