Canon imagePRESS C1+ Reference Manual page 362

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Device Management Settings
Press [Start Scan].
Remove the test print 2 from the platen glass ➞ press [Test Print 3].
Place the output test print 3 on the platen glass.
Place the test print face down on the platen glass, with the black bands at the back side of the
platen glass.
NOTE
If the optional Feeder (DADF-R1) is attached, place the test print face down and stack
approximately 20 sheets of blank paper on top of it for a more precise gradation adjustment.