NEC MultiSync MT840 Troubleshooting, Status Light Messages, Common Problems & Solutions

5. TROUBLESHOOTING

This section helps you resolve problems you may encounter while setting up or using the projector.

Status Light Messages

Condition	Status
OFF	• Normal
On continually	• The projector lamp has exceeded 2000 hours of operation and should be replaced.
Blinking very rapidly (On	• The lamp cover or filter cover is not fastened properly. Check and reattach it if necessary.
and off in a cycle of 1 sec.)
Blinking rapidly (On and off	• The temperature protector has been triggered. If the room temperature is high, move the projector to a
in a cycle of 4 sec)	cooler location. If the temperature inside the projector is high, check the cooling fan hole on the bottom of
	the projector. If the hole is blocked, remove whatever is blocking it.
Blinking slowly (On and off	• The cooling fan has stopped. Contact your NEC dealer for service.
in a cycle of 8 sec.)
Blinking very slowly (On	• The lamp is not turned on.
and off in a cycle of 12 sec.)	The projector was turned off and back on too quickly. Turn off the projector, wait one minute, then turn the
	projector back on. Or the lamp is burnt out.

Common Problems & Solutions

Problem	Check These Items
Does not turn on	•	Check that the power cable is plugged in and that the power button on the projector cabinet or the remote
		control is on.
	• Ensure that the lamp cover is installed correctly. See page E-33.
	• Check to see if the projector has overheated or the lamp usage exceeds 2100 hours. If there is insufficient
		ventilation around the projector or if the room where you’re presenting is particularly warm, move the
		projector to a cooler location.
No picture	•	Use the menu to select your source (Video, S-Video, RGB or PC Card Viewer). See page E-20.
	• Ensure your cables are connected properly.
	• Use menus to adjust the brightness and contrast. See page E-20
	• Remove the lens cap.
	•	Reset the settings or adjustments to factory preset levels using the Factory Default in the Adjustment
		Menu. See page E-21
Image isn’t square to the	•	Reposition the projector to improve its angle to the screen. See page E-12
screen	•	Use the Keystone in the Adjustment Menu to correct the trapezoid distortion. See page E-21
Picture is blurred	•	Adjust the focus. See page E-12 or E-17.
	• Reposition the projector to improve its angle to the screen. See page E-12
	•	Ensure that the distance between the projector and screen is within the adjustment range of the lens. See
		page E-13
Image is scrolling verti-	•	Use menus or Source button on the remote control or the cabinet to select the source you want to input.
cally, horizontally or both
Remote control does not	•	Install new batteries. See page E-34.
work	•	Make sure there are no obstacles between you and the projector.
	• Stand within 22 feet (7 m) of the projector. See page E-34.
	• Make sure that you are in the Projector mode or the Computer/Projector Select button lights in red.
		If not, press the Computer/Projector Select button.
Status indicator is lit or	•	See the Status Light messages above.
blinking
Cross color in RGB mode	•	If Auto Adjust is off, turn it on. If Auto Adjust is on, turn it off and balance the image with the Position and
		Pixel Adjust in the Adjustments Menu. See page E-21.

E–35