Brother MFC620CN Service Manual page 269

The printing sample below describes the MFC210C model. As to the samples of the other models, it may differ
from the text part.
Check that the dotted line forming the four color blocks are all visible with no gaps. If OK select (Yes) at the control panel.
If gaps are visible select (No) at the control panel to start the cleaning process and follow the prompts at the LCD.
Test Pattern
8 - 1 1
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