Wrinkles or creases
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Make sure that media is loaded properly.
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Check the media type and quality.
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Open the straight-through output door and try printing
straight through.
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Turn over the stack of media in the tray. Also, try rotating
the media 180° in the input tray.
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For envelopes, this can be caused by air pockets inside
the envelope. Remove the envelope, flatten the
envelope, and try printing again.