BenQ Projector MU686 User Manual

Maintenance 51
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:
Lamp Usage Time = (hours used in Normal mode) + (hours used in Economic mode) + 
(hours used in SmartEco mode) + (hours used in LampSave mode)
Total (equivalent) lamp hour = 2.50 x (hours used in Normal mode) + 1.875 x (hours 
used in Economic mode) +...

Maintenance 52
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 consult your dealer or go to http://www.BenQ.com before 
installing a new lamp. 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. 
Turn the power off and let the projector cool for 45 minutes. If the Lamp or...

Maintenance 53
Replacing the lamp
WA R N I N G :
•  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...

Maintenance 5414. Connect the power and restart the projector.
Do not turn the power on with the lamp cover removed. 
7. Use the handle to slowly pull the lamp out of 
the projector.
WA R N I N G :
•  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...

Maintenance 55
Resetting the lamp timer
15. After the startup logo, open the On-Screen Display (OSD) menu. Go to the 
SYSTEM SETUP: Advanced > Lamp Settings menu. Press OK. 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 OK. The lamp 
time will be reset to “0”.
Do not reset if the lamp is not new or replaced as this could cause damage.  

Maintenance 56
Indicators
LightStatus & Description
Powe 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
Red FlashingRed 
FlashingRed 
FlashingDownload
Green Off RedCW start fail
Red Flashing Off OffScaler shutdown fail (data abort)
Red Off RedScaler reset fail (video projector only)
Green Off OffBurn-in ON
Green Green GreenBurn-in OFF
Lamp events
Off Off RedLamp1 error in normal operation
Off...

Troubleshooting 57
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 cord.Plug the power cord into the AC power jack 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
58
Specifications
Projector specifications
All specifications are subject to change without notice.
Optical
Resolution
1920 x 1200 WUXGA
Display system 1-CHIP DMD
Lens F = 2.59 ~ 2.87, f = 16.88 ~ 21.88 mm
Clear focus range 1.49
–4.47 m @ Wide, 
1.94–5.81 m @ Tele
Lamp 240 W lamp
Electrical
Power supplyAC100–240V, 3.5 A, 50–60 Hz (Automatic)
Power consumption 370 W (Max); < 0.5 W (Standby)
Mechanical
Weight
3.3 Kg (7.3 lbs)
Output terminals
RGB outputD-Sub 15-pin (female) x 1
Speaker 2...

Specifications 59
Dimensions
331 mm (W) x 114.4 mm (H) x 246.2 mm (D)
Ceiling mount installation
331
246.2114.4
Unit: mm
127.7
635.92
100.57
577.7
537.9
8199.6
77
116.99
156.37
330.98
76.5 40.49
Ceiling Mount screw: M4 (Max L = 25 mm; Min L = 20 mm)
Unit: mm 

Specifications 60
Timing chart
Supported timing for PC input
*Supported timing for 3D signal in Frame Sequential, Top Bottom and Side by Side formats.
ResolutionMode
Ve r t i c a l  
Frequency 
(Hz)Horizontal 
Frequency 
(kHz)Pixel 
Frequency
(MHz)
640 x 480VGA_60* 59.940 31.469 25.175
VGA_72 72.809 37.861 31.500
VGA_75 75.000 37.500 31.500
VGA_85 85.008 43.269 36.000
720 x 400 720 x 400_70 70.087 31.469 28.3221
800 x 600SVGA_60* 60.317 37.879 40.000
SVGA_72 72.188 48.077 50.000
SVGA_75 75.000 46.875...