NEC PA721X User Manual
Also see for PA521U: User manualInstallation guideUser manual
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Contents
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2079. Appendix Troubleshooting Check ListBefore contacting your dealer or service personnel, check the following list to be sure repairs are needed also byreferring to the “Troubleshooting” section in your user’s manual. This checklist below will help us solve your problemmore efficiently.* Print this page and the next page for your check.Frequency of occurrence always sometimes (How often?_____________________) other (__________________)No image is displayed from your PC or video equipment to theprojector�Still no image even though you connect the projector to the PCfirst, then start the PC�Enabling your notebook PC’s signal output to the projector�• A combination of function keys will enable/disable the exter-nal display. Usually, the combination of the “Fn” key alongwith one of the 12 function keys turns the external displayon or off.No image (blue or black background, no display)�Still no image even though you press the AUTO ADJUSTbutton�Still no image even though you carry out [RESET] in theprojector’s menu�Signal cable’s plug is fully inserted into the input connectorA message appears on the screen�( _____________________________________________ )The source connected to the projector is active and available�Still no image even though you adjust the brightness and/orthe contrast�Input source’s resolution and frequency are supported by theprojector�PowerNo power (POWER indicator does not light blue) See also “StatusIndicator (STATUS)”�Power cord’s plug is fully inserted into the wall outlet�Lamp cover is installed correctly�Lamp Hours Used (lamp operation hours) was cleared afterlamp replacement�No power even though you press and hold the POWER but-ton�Shut down during operation�Power cord’s plug is fully inserted into the wall outlet�Lamp cover is installed correctly�[AUTO POWER OFF] is turned off (only models with the [AUTOPOWER OFF] function)�[OFF TIMER] is turned off (only models with the [OFF TIMER]function)�Video and AudioImage is too dark�Remains unchanged even though you adjust the brightnessand/or the contrast�Image is distorted�Image appears to be trapezoidal (unchanged even though youcarry out the [KEYSTONE] adjustment)�Parts of the image are lost�Still unchanged even though you press the AUTO ADJUSTbutton�Still unchanged even though you carry out [RESET] in theprojector’s menu�Image is shifted in the vertical or horizontal direction�Horizontal and vertical positions are correctly adjusted on acomputer signal�Input source’s resolution and frequency are supported by theprojector�Some pixels are lost�Image is flickering�Still unchanged even though you press the AUTO ADJUSTbutton�Still unchanged even though you carry out [RESET] in theprojector’s menu�Image shows flickering or color drift on a computer signal�Still unchanged even though you change [FAN MODE] from[HIGH ALTITUDE] to [AUTO]�Image appears blurry or out of focus�Still unchanged even though you checked the signal’s resolutionon PC and changed it to projector’s native resolution�Still unchanged even though you adjusted the focus�No sound�Audio cable is correctly connected to the audio input of theprojector�Still unchanged even though you adjusted the volume level�AUDIO OUT is connected to your audio equipment (only modelswith the AUDIO OUT connector)�OtherRemote control does not work�No obstacles between the sensor of the projector and theremote control�Projector is placed near a fluorescent light that can disturb theinfrared remote controls�Batteries are new and are not reversed in installation�Buttons on the projector cabinet do not work (only models with the[CONTROL PANEL LOCK] function)[CONTROL PANEL LOCK] is not turned on or is disabled inthe menu�Still unchanged even though you press and hold the EXIT buttonfor a minimum of 10 seconds� |
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