Canon i860 Quick Start Manual page 56

Printing Maintenance
(3) Uneveness stripes in this pattern indicates the print head requires alignment.
When lines are uneven
See Aligning the Print Head
(4) White vertical stripes in this pattern indicate the print head requires alignment.
When vertical stripes appear
See Aligning the Print Head
(5) Horizontal stripes in this pattern indicate the print head requires alignment.
When horizontal stripes appear
See Aligning the Print Head
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When lines are even