Canon LBP3310 User Manual page 285

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6-48 Printing with Toner Density Adjusted
Adjust the toner density by dragging the [Toner Density]
slider horizontally.
Move the slider to the right to make it darker and to the left to make it lighter.
Confirm the settings, then click [OK].
The [Quality] sheet reappears.
Click [OK].
The [Print] dialog box reappears.
Click [OK] or [Print].
The printer starts printing.