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) + 1.25 x (hours used in SmartEco mode) + 1.00 x (hours used 
in LampSave mode).
To obtain the lamp hour information:
1. Press MENU and then press  /  to highlight the SYSTEM SETUP: Advanced 
menu.
2. Press  to highlight Lamp Settings and press OK. The Lamp Settings page 
appears.
3. You will see the Lamp Timer information displaying on the menu.
4. To leave the menu, press MENU.
You can also get the lamp hour information on the INFORMATION menu.
Extending lamp life
The projector 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 the Lamp Mode
Setting the projector in Economic, SmartEco or LampSave mode extends the lamp 
operation life. To do so, go to 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 signal 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 > Operation Settings 
> Auto Power Off menu and press  / . 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.
Lamp modeDescription
NormalProvides full lamp brightness
EconomicLowers brightness to extend the lamp life and decreases the fan 
noise
SmartEcoAdjusts the lamp power automatically depending on the content 
brightness level
LampSaveAdjusts the lamp power automatically and lowers the brightness to 
extend the lamp life 
						

							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 Temp indicator still lights up after 
turning the power back on, please contact your dealer. See Indicators on page 56 for details.
The following Lamp warning displays will remind you to change the lamp.
XXXX shown in the above messages are numbers that vary depending on different models.
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 51), you may continue to operate the 
projector until the next hour lamp warning 
appears.
Press OK to dismiss the message.
It is strongly recommended that you replace the 
lamp at this age. The lamp is a consumable item. 
The lamp brightness diminishes with use. This is 
normal lamp behavior. You can replace the lamp 
whenever you notice that the brightness level has 
significantly diminished.
Press OK to dismiss the message.
The lamp MUST be replaced before the projector 
will operate normally.
Press OK to dismiss the message.
Order a replacement lampEquivalent lamp hour >XXXX Hours
Order a new lamp at www.BenQ.com
NOTICE
Replace lamp soonEquivalent lamp hour > XXXX Hours
Order a new lamp at www.BenQ.com
NOTICE
Out of lamp usage timeReplace lamp (Refer to user manual)
Then reset lamp timer
Order a new lamp at www.BenQ.com
NOTICE
Replace lamp now
Equivalent lamp hour > XXXX Hours
Order a new lamp at www.BenQ.com
NOTICE 
						

							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 compromising image quality by touching the lens, do not 
touch the empty lamp compartment 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 qualified 
projector lamp for lamp replacement.
•  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.
•  Ensure good ventilation when handling broken lamps. We recommend that you use respirators, safety 
glasses, goggles or face shield and wear protective clothing such as gloves.
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(s) that secure the lamp 
cover on the side of the projector until the 
lamp cover loosens.
3. Remove the lamp cover from the projector.
WA R N I N G :
•  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. Disconnect the lamp connector.
5. Loosen the screw that secures the lamp.
6. Lift the handle so that it stands up.
4
564 
						

							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 the optical components 
inside, it could cause color unevenness and distortion of 
the projected images.
8. As shown in the figure, lower the new lamp.
9. Insert the lamp connector.
10. Tighten the screw that secures the lamp.
11. Ensure the handle is fully laid flat and locked 
in place.
WA R N I N G :
•  Loose screw may cause a bad connection, which could 
result in malfunction.
•  Do not over tighten the screw.
12. Replace the lamp cover on the projector.
13. Tighten the screw(s) that secure the lamp 
cover. 
WA R N I N G :
•  Loose screw may cause a bad connection, which could 
result in malfunction.
•  Do not over tighten the screw.
1011
9 
						

							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 OffOrange 
FlashingLamp is not lit up
Green Off OrangeLamp life exhausted
Off Green RedLamp door is open
Thermal events
Red Red OffFan 1 error (the actual fan speed is outside the 
desired speed)
RedRed 
FlashingOffFan 2 error (the actual fan speed is outside the 
desired speed)
Red Green OffFan 3 error (the actual fan speed is outside the 
desired speed)
RedGreen 
FlashingOffFan 4 error (the actual fan speed is outside the 
desired speed)
Green Red OffTemperature 1 error (over limited temperature) 
						

							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.
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 projector if necessary.
The lens cover is still closed. Open the lens cover.
CauseRemedy
The battery is out of power. Replace the battery with new ones.
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 27 for details. 
						

							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 watt x 1
Audio signal output Audio jack x 1
USB Type-A 5V/1.5A x 1 (for power supply only)
Control
RS-232 serial control9 pin x 1
IR receiver x 2
USB Mini-B x 1
Input terminals
Computer input RGB input D-Sub 15-pin (female) x 1
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; HDMI/MHL x 1
Audio signal input Audio in PC audio jack x 1
RCA audio jack (L/R) x 1 
Environmental Requirements
Operating temperature0°C–40°C at sea level
Storage temperature -20°C–60°C at sea level
Operating/Storage 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 Altitude Mode on) 
						

							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 49.500
SVGA_85 85.061 53.674 56.250
SVGA_120** 
(Reduce Blanking)119.854 77.425 83.000
1024 x 768XGA_60* 60.004 48.363 65.000
XGA_70 70.069 56.476 75.000
XGA_75 75.029 60.023 78.750
XGA_85 84.997 68.667 94.500
XGA_120** 
(Reduce Blanking)119.989 97.551 115.5
1152 x 864 1152 x 864_75 75 67.5 108
1024 x 576BenQ 
Notebook_timing60.0 35.820 46.966
1024 x 600BenQ 
Notebook_timing64.995 41.467 51.419
1280 x 720 1280 x 720_60* 60 45.000 74.250
1280 x 768 1280 x 768_60* 59.87 47.776 79.5
1280 x 800WXGA_60* 59.810 49.702 83.500
WXGA_75 74.934 62.795 106.500
WXGA_85 84.880 71.554 122.500
WXGA_120** 
(Reduce Blanking)119.909 101.563 146.25
1280 x 1024SXGA_60*** 60.020 63.981 108.000
SXGA_75 75.025 79.976 135.000
SXGA_85 85.024 91.146 157.500
1280 x 9601280 x 960_60*** 60.000 60.000 108.000
1280 x 960_85 85.002 85.938 148.500
1360 x 768 1360 x 768_60*** 60.015 47.712 85.5
1440 x 900 WXGA+_60*** 59.887 55.935 106.500
1400 x 1050 SXGA+_60*** 59.978 65.317 121.750
1600 x 1200 UXGA*** 60.000 75.000 162.000
1680 x 1050 1680 x 1050_60*** 59.954 65.29 146.25
640 x 480@67Hz MAC13 66.667 35.000 30.240
832 x 624@75Hz MAC16 74.546 49.722 57.280
1024 x 768@75Hz MAC19 74.93 60.241 80.000
1152 x 870@75Hz MAC21 75.060 68.680 100.000
1920 x 1080@60Hz 1920 x 1080_60 60 67.5 148.5
1920 x 1200@60Hz1920 x 1200_60 
(Reduce blanking)59.95 74.038 154