Canon Laser Shot LBP5970 User Manual page 477

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7-82 When Any Print Defect Appears
Make sure that the levers near the drum cartridge guides on
the both sides are in the proper position as shown in the
figure.
Make sure that the labels on the projections of the drum
cartridge are visible.
If you cannot see any of the three colors on the label from the front, take out the
drum cartridge once, turn the projection (A) in the direction of the arrow until it
clicks and stops, and then reinstall the cartridge.
(A)
Make sure that all of the three colors
on the label are visible.