Canon Color ImageRunner C3380 Reference Manual page 250

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Adjusting the Machine
Press [Start Scan].
Remove the first test print from the platen glass ➞ press
[Test Print 2].
Place the second test print on the platen glass.
Place the test print face down on the platen glass, with the black bands along the
top left back edge of the platen glass by the arrow.
Press [Start Scan].
Remove the second test print from the platen glass ➞ press
[Test Print 3].
Place the third test print on the platen glass.
Place the test print face down on the platen glass, with the black bands along the
top left back edge of the platen glass by the arrow.
Press [Start Scan].
Remove the third test print from the platen glass.