Brother MFC-J3520 Service Manual page 102

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Stained leading edge of recording paper
Step
1
Maintenance unit stained
2
Paper feeding correction value
not updated
3
Head defective
Overlapping lines over the whole page
Step
1
Head inclination is not correctly
adjusted.
2
Head calibration uncompleted
3
Paper feeding correction value
not updated
4
PF encoder disk stained
5
PF encoder disk defective
6
Head defective
7
Main PCB defective
User Check
- Check whether the recording paper being used is within
the specification.
Cause
Clean the maintenance unit (refer to
(2-62).)
Adjust the paper feeding correction value (refer
to
Feeding Correction
Replace the head/carriage unit.
User Check
- Carry out head cleaning.
Cause
Adjust the head inclination (refer to
Section 2.4 "Adjust head
Write the head calibration data (refer to
5, Section 1.3.2 "Creating of Head Calibration
Data and Writing it into Flash
Adjust the paper feeding correction value (refer
to
Feeding Correction
Clean the PF encoder disk and flushing guide
(refer to
BEFORE
Replace the PF encoder disk.
Replace the head/carriage unit.
Replace the main PCB ASSY.
2-68
Solution
Chapter 5, Section 1.3.19 "Updating of Paper
Values.")
Solution
Chapter 5, Section 1.3.19 "Updating of Paper
Values.")
Chapter 3, Section 1 "PRECAUTIONS
PROCEEDING.")
Fig. 2-10
Chapter 4,
inclination.")
Chapter
ROM.")
Confidential

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