Canon iPF720 User Manual page 591

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PHead needs cleaning. (→P.588)
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Prepare for maint cart replacement. (→P.590)
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Prepare for parts replacement. (→P.595)
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Printhead error (→P.589)
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Problem with Printhead (→P.588)
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Regular printing is selected, but a roll is loaded. (→P.581)
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Rel lever is in wrong position. (→P.583)
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Roll printing is selected, but sheets are loaded. (→P.580)
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Roll printing is selected. (→P.580)
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Sheet printing is selected. (→P.581)
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The roll is empty. (→P.580)
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This paper cannot be used. (→P.579)
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This type of paper is not compatible with HP-GL/2. (→P.593)
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Top cover is open. (→P.595)
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Unknown le. (→P.595)
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Use another paper. (→P.587)
Other Messages
These messages do not prevent printer operation. Check the information on the Display Screen and take
action as necessary. Messages requiring special attention are as follows:
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Remaining level of the ink cannot be correctly detected. (→P.586)
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Responding to Messages
Error Message 577