BenQ Projector MX854UST User Manual

Maintenance61
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 clean.
Never remove any parts of the projector except the lamp. Contact your dealer if other 
parts need replacing.
Cleaning the Projector Mirror
Remove the dust with a Bellows/Lens Blower readily available from camera shops to 
prevent scratching the mirror with subsequently wiped.
Cleaning the lens
Clean the lens whenever you notice dirt or dust...

Maintenance 62
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 = A*(hours used in 
Normal mode) + B*(hours used in Economic 
mode) + 1.00*(hours used in SmartEco mode) 
See Setting Lamp mode as Economic or SmartEco below for more information on Economic 
mode.
To obtain the lamp hour...

Maintenance63
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  s e t  Auto Power Off, go into the SYSTEM SETUP: Basic > 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...

Maintenance 64
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.
Go to http://www.benq.com for a replacement lamp.
The Lamp indicator light and Temperature warning light will light up if the lamp becomes too 
hot. Turn the projector off and let the projector cool for 45 minutes....

Maintenance65
Replacing the lamp
• 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...

Maintenance 66
10. Restart the projector.
Do not turn the power on with the lamp cover removed.
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...

Maintenance67
Resetting the lamp timer
11. 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. Highlight Reset lamp timer. 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. 
Cleaning the projector mirror 
Remove dust...

Maintenance 68
Indicators 
LightStatus & DescriptionPow e rTe m pLamp
Pow e r  eve n t s
Orange Off OffStand-by mode
Green
FlashingOff OffPowering up
Green Off OffNormal operation
Orange
FlashingOff OffProjector is cooling.
Lamp events
Off OffOrange 
FlashingThe lamp ignition is not lit up.
Off Off Red1. The projector needs 90 seconds to cool down. Or
2. Please contact your dealer for assistance.
Thermal events
Red Red Red
The fans are not 
working.The projector has shutdown 
automatically. If you try to...

Troubleshooting69
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....

Specifications 70
Specifications
Projector specifications
All specifications are subject to change without notice. 
Optical
Resolution
MX854UST
1024 x 768  XGA
MW855UST
1280 x 800  WXGA
MH856UST
1920 x 1080  1080p
Display system
Single-chip DLP™ system
Lens F/Number
F = 2.5, f = 5.1 mm
Clear focus range (from IO to screen)
MX854UST/MW855UST
0.28m~0.45m
MH856UST
0.34m~0.51m
Lamp
MX854UST/MW855UST
240W lamp
MH856UST
280W lamp
Electrical
Power supply
AC100-240V, 3.8A
50-60 Hz (Automatic)
Power consumption...