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9-32 Confidential

Problem Action to be taken

(10) White horizontal streaks

• Perform the head purging operation several times to remove

dust or air bubbles from its nozzles.

• Replace the head/carriage unit.

• Check the paper feed-related rollers.

• Perform the print head skew compensation with the head

screw adjuster knob. Refer to Chapter 3, Section 3.2.2.4.

• Clean the head caps and wiper of the maintenance unit with a

Rubycel stick. For the cleaning procedure, refer to Chapter 7,

Section 7.1 "CLEANING THE MAINTENANCE UNIT."

(11) Stained leading edge of

recording paper

Printer

• Press the Ink button to perform a head cleaning operation.

• Check that the head/carriage unit is set into place.

(12) Overlapping or separated

lines over the whole page

• Adjust the paper feeding correction value of the paper feed

roller. (Refer to Chapter 6, Section 6.2, [ 5 ].)

(13) Overlapping or separated

lines at the trailing edge of

the recording paper

• Adjust the paper feeding correction value of the paper ejection

roller. (Refer to Chapter 6, Section 6.2, [ 5 ].)

(14) Ghost

VWXYZ

• Adjust the paper feeding correction value of the paper feed

roller and paper ejection roller. (Refer to Chapter 8, Section

8.5.11.)

• Correct the positioning error of the head/carriage unit. (Refer

to Chapter 6, Section 6.2, [ 4 ].)

• Replace the PF encoder disk.

• Replace the PF sensor PCB.

Brother MFC620CN User Manual

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