Canon imagePROGRAF GP-4000 Online Manual page 807

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Cause
Paper loaded crooked was detected when the paper was advanced.
What to Do
Lift up the release lever and reload the paper.
Loading the Upper Roll on the Printer
Loading the Lower Roll on the Roll Unit (Option)
Loading Sheets in the Printer
If this error appears again even after reloading the paper roll, remove the roll holder from the printer, insert
the paper roll firmly into the roll holder until it is up against the flange, and then insert the roll holder into
the printer.
Loading Rolls on the Roll Holder
Important
• If this message continues to appear even after taking the steps above, or if you do not want this
message to appear, set Skew detection accuracy in the printer menu to OFF or Loose. However,
note that the paper will be printed skewed, which could cause paper jams and abnormal print results,
or dirty the platen and the reverse of the next printed sheet.
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