BenQ Projector MP780 ST+ User Manual

Maintenance 91
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
92
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 96 for details.
The following lamp warning displays will remind you to change the lamp.
The...

Maintenance 93
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
943. 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...

Maintenance 95 11. 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...

Maintenance
96
Indicators
LightStatus & Description
POWE
RTEMPLAMP
Pow e r  e v e n t s
Orange Off OffStand-by mode
Green
FlashingOff OffPowering up
Green Off OffNormal operation
Orange
FlashingOff Off
1. The projector needs 90 seconds to cool down as it 
was abnormally shut down without the normal cooling 
down process. Or
2. The projector needs to cool for 90 seconds after the 
power is turned off. Or
3. The projector has shutdown automatically. If you try 
to re-start the projector, it will shutdown...

Troubleshooting 97
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
98
Specifications
All specifications are subject to change without notice. 
Optical
Resolution
1280 x 800 WXGA
Display system
1-CHIP DMD
Lens F/Number
(MP780 ST+)
F = 2.6 
f = 6.9 mm
(MW860USTi)
F = 2.7 
f = 5.45 mm
Lamp
(MP780 ST+)
185 W lamp
(MW860USTi)
225 W lamp
Electrical
Power supply
AC100–240V, 3.20 A,
50-60 Hz (Automatic)
Power consumption
(MP780 ST+)
260 W (Max.)
(MW860USTi)
310 W (Max.)
Mechanical
We i g h t
(MP780 ST+)
3.7 kg (8.1 lbs.)
(MW860USTi)
4.1 kg (9.04 lbs.)
Output...

Specifications 99
Dimensions
(MP780 ST+)
329 mm (W) x 137.2 mm (H) x 241.9 mm (D)
(MW860USTi)
330 mm (W) x 278 mm (H) x 154 mm (D)
329
241.9 137.2
62.577.4
330
278 154
62.577.5 

Specifications
100
Ceiling mount installation
75.0
221.0
100.00
116.00
82.50
107.7
328.0 163.762.5115.1129.1
100.0
146.0
Ceiling mount screws:
M4 x 8 (Max. L = 8 mm)
Unit: mm