Brother MFC-J3520 Service Manual page 96

4.3.2 Print-image problems
Problems related to defective image are end user recoverable if following the User
Check items.
If the same problem occurs, follow each procedure in the order of the number
described in the Step column in the tables below.

Completely blank
Step
1 Maintenance unit stained
2 Wrong head property value
3 Head flat cable connection
failure
4 Carriage flat cable connection
failure
Non-discharge of ink from
5
head
6 Ink supply tubes bent
7 Carriage PCB defective
8 Maintenance unit defective
9 Head defective
10 Main PCB defective
<Cleaning of the maintenance unit>
User Check
- Check if there is enough remaining ink.
- Carry out head cleaning.
Cause
Cleaner stick
Fig. 2-10
2-62
Solution
Clean the maintenance unit (refer to the figure
below.)
Input the head property value (refer to
5, Section 1.3.25 "Updating of Head Property
Data and Backup/Restoration of Head
Calibration Data.")
Reconnect the head flat cable.
Reconnect the carriage flat cable.
Perform the recommended purge procedures.
(refer to the recommended procedures in
Chapter 5, Section 1.3.29 "Purge Operation
(Maintenance mode 76)".
Replace the ink refill ASSY.
Replace the carriage PCB ASSY.
Replace the maintenance unit.
Replace the head/carriage unit.
Replace the main PCB ASSY.
Maintenance unit
Chapter
Confidential