NEC NP-U321H User Manual page 59

Appendices
English ... 52
Problem: Image has vertical flickering bar
Use "CLOCK" to make an adjustment.
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Check and reconfigure the display mode of your graphic card to
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make it compatible with the product.
Problem: Image is out of focus
Adjust the Focus Lever on the projector lens.
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Make sure the projection screen is between the required distance
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22.2 to 30.6 cm from the projector (refer to pages 25-26).
Problem: The image is stretched when displaying 16:9 DVD
The projector automatically detects 16:9 DVD and adjusts the aspect
ratio by digitizing to full screen with 4:3 default setting.
If the image is still stretched, you will also need to adjust the aspect
ratio by referring to the following:
Please select 4:3 aspect ratio type on your DVD player if you are
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playing a 16:9 DVD.
If you can't select 4:3 aspect ratio type on your DVD player,
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please select 4:3 aspect ratio in the on screen menu.
Problem: Image is reversed
Select "SETTING|GENERAL-->ORIENTATION" from the OSD
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and adjust the projection direction.
Problem: Lamp burns out or makes a popping sound
When the lamp reaches its end of life, it will burn out and may
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make a loud popping sound. If this happens, the projector will
not turn on until the lamp module has been replaced. To replace
the lamp, follow the procedures in the "Replacing the Lamp".