BenQ Mp721 Users Manual

Maintenance 47
Lamp information
Calculation of 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
=  (hours used in Economic mode) + 4/3 (hours used in normal mode)
See Economic Mode (off) on page 44 for more information on Economic mode.
The lamp hour in Economic mode is calculated as 2/3 of that in normal mode. That is,...

Maintenance 48
Replacing the 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 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...

Maintenance 49 3. Remove the lamp cover from the projector.
Do not turn the power on with the lamp cover 
removed.
4. Remove the lamp cords from the slots.
5. Disconnect the lamp connector by pushing it 
against the projector while pulling it up.
6. Loosen the screw that secures the lamp.
7. 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...

Maintenance 5014. Restart the projector.
Do not turn the power on with the lamp cover removed. 
15. Resetting the lamp counter 
Do not reset if the lamp is not replaced as this could cause 
damage. 
i. Press and hold the Exit 5 button on the 
projector for 5 seconds to display the total used 
lamp time.
ii. Press Auto on the projector or on the remote 
control to reset the lamp hour to “0”.
iii. Wait about 5 seconds to let the OSD disappear.
Temperature information
When the Temperature warning light is...

Maintenance 51
Indicators
Illustration
•Blank -: Light OFF
•O: Orange light
•: Light flashing•R: Red light
•: Light ON•G: Green light
LightStatus & Description
PowerTe m pLamp
Power events
The projector has just been connected to a power outlet.
--Stand-by mode.
--Powering up.
--Normal operation.
--
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.
--The...

Maintenance 52
LightStatus & Description
PowerTe m pLamp
Thermal events
--
The projector has shutdown automatically. If you try to re-start 
the projector, it will shutdown again. Please contact your dealer 
for assistance.
-
-
-
-
 R 
 R  R
 R  G
 R O
 R  R  R
 R  R  G
 R  R O
 G  R  R
 G  R  G
 G  R O
O  R  R
O  R  G
O  R O
 G  R
 G  G
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Troubleshooting 53
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...

Specifications 54
Specifications
Projector specifications 
All specifications are subject to change without notice. 
General
Product name Digital Projector
Model name MP721/MP721c
Optical
Resolution 1024 x 768 XGA
Display system 1-CHIP DMD
Lens F/Number F=2.6 to 2.77, f= 20.4 to 23.5 mm
Lamp 200W lamp
Electrical
Power supply AC100–240V, 4.0A, 50–60 Hz (Automatic)
Power consumption 285W (Max)
Mechanical
Dimensions 278 mm (W) x 94 mm (H) x 219.5 mm (D)
Weight 5.9 lbs (2.67 Kg)
Input terminal
Computer...

Specifications 55
Timing chart
Supported timing for PC input
Supported timing for Component-YP
bPr input
Supported timing for Video and S-Video inputs
ResolutionHorizontal 
Frequency 
(kHz)Ve r t i c a l  
Frequency 
(Hz)Pixel 
Frequency 
(MHz)Mode
640 x 48031.469 59.940 25.175 VGA_60
37.861 72.809 31.500 VGA_72
37.500 75.000 31.500 VGA_75
43.269 85.008 36.000 VGA_85
720 x 400 31.469 70.087 28.3221 720 x 400_70
800 x 60037.879 60.317 40.000 SVGA_60
48.077 72.188 50.000 SVGA_72
46.875 75.000 49.500...

Specifications 56
Dimensions
278 mm (W) x 94 mm (H) x 219.5 mm (D)
Unit: mm 
219.5
278
 94
64.3
53
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