NEC NP-PX750U User Manual - Page 236

9. Appendix Common Problems & Solutions (→ "Power/Status/Lamp Indicator" on page 220.) Problem Check These Items Does not turn on or shut down • Check that the power cord is plugged in and that the power button on the projector cabinet or the remote control is on� (→ pages 13, 14, 17) • Ensure that the lamp cover is installed correctly. (→ page 176) • Check to see if the projector has overheated. If there is insufficient ventilation around the projector or if the room where you are presenting is particularly warm, move the projector to a cooler location� • Check to see if you continue to use the projector for another 100 hours after the lamp has reached the end of its life� If so, replace the lamp� After replacing the lamp, reset the lamp hours used� (→ page 129) • The lamp may fail to light. Wait a full minute and then turn on the power again. • Set [FAN MODE] to [HIGH ALTITUDE] when using the projector at altitudes approximately 5500 feet/1600 meters or higher� Using the projector at altitudes approximately 5500 feet/1600 meters or higher without setting to [HIGH ALTITUDE] can cause the projector to overheat and the projector could shut down� If this happens, wait a couple minutes and turn on the projector� (→ page 121) If you turn on the projector immediately after the lamp is turned off, the fans run without displaying an image for some time and then the projector will display the image� Wait for a moment� Will turn off • Ensure that the [OFF TIMER], [AUTO POWER OFF] or [PROGRAM TIMER] is off. (→ page 113, 124) No picture • Check if the appropriate input is selected. (→ page 20) If there is still no picture, press the SOURCE button or one of the input buttons again� • Ensure your cables are connected properly. • Use menus to adjust the brightness and contrast. (→ page 103) • Ensure that the lens cover is open. (→ page 16) • Reset the settings or adjustments to factory preset levels using the [RESET] in the Menu. (→ page 129) • Enter your registered keyword if the Security function is enabled. (→ page 42) • If the HDMI input or the DisplayPort signal cannot be displayed, try the following. - Reinstall your driver for the graphics card built in your computer, or use the updated driver� For reinstalling or updating your driver, refer to the user guide accompanied with your computer or graphics card, or contact the support center for your computer manufacturer� Install the updated driver or OS on your own responsibility� We are not liable for any trouble and failure caused by this installation� • Be sure to connect the projector and notebook PC while the projector is in standby mode and before turning on the power to the notebook PC� In most cases the output signal from the notebook PC is not turned on unless connected to the projector before being powered up� * If the screen goes blank while using your remote control, it may be the result of the computer's screen-saver or power management software� • See also the page 224� Color tone or hue is un- • Check if an appropriate color is selected in [WALL COLOR]. If so, select an appropriate option. (→ page 111) usual • Adjust [HUE] in [PICTURE]. (→ page 103) Image isn't square to the • Reposition the projector to improve its angle to the screen. (→ page 21) screen • Use the Keystone correction function to correct the trapezoid distortion. (→ page 26) Picture is blurred • Adjust the focus. (→ page 24) • Reposition the projector to improve its angle to the screen. (→ page 21) • Ensure that the distance between the projector and screen is within the adjustment range of the lens. (→ page 204) • Has the lens been shifted by an amount exceeding the guaranteed range? (→ page 207) • Condensation may form on the lens if the projector is cold, brought into a warm place and is then turned on. Should this happen, let the projector stand until there is no condensation on the lens� Flicker appears on screen • Set [FAN MODE] to other than [HIGH ALTITUDE] mode when using the projector at altitudes approximately 5500 feet/1600 meters or lower� Using the projector at altitudes less than approximately 5500 feet/1600 meters and setting to [HIGH ALTITUDE] can cause the lamp to overcool, causing the image to flicker� Switch [FAN MODE] to [AUTO]� (→ page 121) Image is scrolling ver- • Check the computer's resolution and frequency. Make sure that the resolution you are trying to display is supported tically, horizontally or by the projector� (→ page 213) both • Adjust the computer image manually with the Horizontal/Vertical in the [IMAGE OPTIONS]. (→ page 105) 222