Brother MFC4820C Service Manual page 38

(3) The LCD asks you if the print quality is OK for each color. Press the 1 or 2 key on the dial
pad.
When you have finished selecting the 1 key (YES) or the 2 key (NO) for each color, the LCD
shows:
Press the 1 key (YES), and then machine starts cleaning the colors. After cleaning is finished,
Fax Start
press the key. The machine starts printing the PRINT QUALITY CHECK SHEET
again and goes back to the first step of STEP A.
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