Brother MFC-J6920DW, Service Manual

Page: 101 / 365

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