Canon S400 Reference Manual page 154

Check 1
Has the print head been aligned?
Each time you install a print head, you must align the print head. If you do
not align the print head, straight lines may appear broken or uneven.
Check 2
Is Print Quality set to Fast in the printer driver?
Changing Print Quality to Fine in the printer driver may improve the quality
of printed straight lines.
Windows
1
Open the Printer Properties dialogue box.
2
Click the Advanced button in the Main tab.
3
In the Quality tab, drag the slide bar to right to select Fine.
Macintosh
1
When using Manual for printing, click the Details button in the Print dia-
logue box.
2
In the Quality panel, drag the slide bar to right to select Fine.
Aligning the Print Head
Troubleshooting - Printout is Unsatisfactory
Straight lines are broken
154