Brother MFC-J3520 Service Manual page 101


Random missing dots
Step
1 Maintenance unit stained
2 Non-discharge of ink from
head
3 Carriage PCB defective
4 Maintenance unit defective
5 Head defective
6 Main PCB defective

White horizontal streaks
Step
1 Maintenance unit stained
2 Paper feeding correction not
updated
3 Head inclination is not correctly
adjusted
4 PF encoder disk stained
5 Non-discharge of ink from
head
6 PF encoder disk defective
7 Carriage PCB defective
8 Maintenance unit defective
9 Head defective
10 Main PCB defective
User Check
- Carry out head cleaning.
- Replace the ink cartridge.
Cause
Clean the maintenance unit (refer to
(2-62).)
Perform the recommended purge procedures.
(refer to the recommended procedures in
Chapter 5, Section 1.3.29 "Purge Operation
(Maintenance mode
Replace the carriage PCB ASSY.
Replace the maintenance unit.
Replace the head/carriage unit.
Replace the main PCB ASSY.
User Check
- Check if it is not in draft mode.
- Carry out head cleaning.
Cause
Clean the maintenance unit (refer to
(2-62).)
Update paper feed correction (refer to
5, Section 1.3.19 "Updating of Paper Feeding
Correction
Adjust the head inclination (refer to
Section 2.4 "Adjust head
Clean the PF encoder disk and flushing guide
(refer to
BEFORE
Perform the recommended purge procedures.
(refer to the recommended procedures in
Chapter 5, Section 1.3.29 "Purge Operation
(Maintenance mode
Replace the PF encoder disk.
Replace the carriage PCB ASSY.
Replace the maintenance unit.
Replace the head/carriage unit.
Replace the main PCB ASSY.
2-67
Solution
76)".
Solution
Values.")
inclination.")
Chapter 3, Section 1 "PRECAUTIONS
PROCEEDING")
76)".
Fig. 2-10
Fig. 2-10
Chapter
Chapter 4,
Confidential