BenQ Mh740 Digital Projector User Manual

Operation51
5. System Setup: Advanced menu
Baud Rate
Selects a baud rate that is identical with your computer’s so that you 
can connect the projector using a suitable RS-232 cable and update 
or download the projector’s firmware. This function is intended for 
qualified service personnel.
Te s t  P a t t e r nSelecting On enables the function and the projector displays the grid 
test pattern. It helps you adjust the image size and focus and check 
that the projected image is free from distortion.
Closed...

Operation 52
The Information menu shows you the current operating status of the projector.
6. Information menu
Current 
System 
Status
Source
Shows the current signal source.
Picture Mode
Shows the selected mode in the Picture menu.
Resolution
Shows the native resolution of the input signal.
Lamp Mode
Shows the current lamp mode.
3D Format
Shows the current 3D mode.
Color System
Shows input system format, NTSC, PAL, SECAM or RGB.
Equivalent Lamp Hour
Displays the number of hours the lamp has been used....

Maintenance53
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 lens
Clean the lens whenever you notice dirt or dust on the surface. 
• Use a canister of compressed air to remove dust. 
• If there is dirt or smears, use lens-cleaning paper or moisten a soft cloth with lens 
cleaner...

Maintenance 54
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:
See Setting Lamp mode as Economic or SmartEco below for more information on Economic mode.
To obtain the lamp hour information:
1. Press MENU/EXIT and then press ◄/► until the SYSTEM SETUP: Advanced 
menu is highlighted.
2. Press ▼ to highlight Lamp...

Maintenance55
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://lamp.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....

Maintenance 56
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...

Maintenance57
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 the...

Maintenance 58
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.  

Maintenance59
Indicators
LightStatus & Description
Pow 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...

Troubleshooting 60
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...