White Horizontal Streaks; Stained Leading Edge Of Recording Paper; Overlapping Or Separated Lines Over The Whole Page; Ghost - Brother MFC640CW Service Manual

Problem

(10) White horizontal streaks

(11) Stained leading edge of
recording paper
(12) Overlapping or separated
lines over the whole page
(13) Overlapping or separated
lines at the trailing edge of the
recording paper

(14) Ghost

VWXYZ
• 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
• Clean the head caps and wiper of the maintenance unit with a
Rubycel stick. For the cleaning procedure, refer to
Section 7.1 "CLEANING THE MAINTENANCE UNIT."
Printer
• Press the Ink button to perform a head cleaning operation.
• Check that the head/carriage unit is set into place.
• Adjust the paper feeding correction value of the paper feed
roller. (Refer to Chapter 6, Section 6.2, [ 4 ].)
• Adjust the paper feeding correction value of the paper ejection
roller. (Refer to Chapter 6, Section 6.2, [ 4 ].)
• Adjust the paper feeding correction value of the paper feed
roller and paper ejection roller. (Refer to
8.4.11.)
• Correct the positioning error of the head/carriage unit. (Refer
to Chapter 6, Section 6.2, [ 3
• Replace the PF encoder disk.
• Replace the PF sensor PCB.
9 - 3 4
Action to be taken
Chapter 3, Section 3.2.2.4.
Chapter 8, Section
].)
Chapter 7,
Confidential