Brother MFC Series Service Manual page 90

■ 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
aligned
3 Head inclination is not adjusted Adjust the head inclination.
4 Head calibration not performed Perform head calibration.
5
Non-discharge of ink from head
6 PF encoder disk stained
7 PF encoder disk defective
8 Carriage PCB defective
9 Maintenance unit defective
10 Head defective
11 Main PCB defective
<User Check>
- Carry out head cleaning.
- Replace the Ink cartridge.
- Refill Ink.
Cause
Clean the Maintenance unit.
(Refer to
Carry out the recommended purge procedures. Refer to
"Recommended purge procedures" in
1.4.26 "Purge Operation (Maintenance mode 76)"
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.
- Replace the Ink cartridge.
- Refill Ink.
- Carry out head cleaning.
Cause
Clean the Maintenance unit.
(Refer to
Perform paper feeding correction.
(Refer to
Adjust the AMS06.
(Refer to
(Refer to
(Refer to
Carry out the recommended purge procedures. Refer to
"Recommended purge procedures" in
1.4.26 "Purge Operation (Maintenance mode 76)"
Clean the PF encoder disk and flushing guide.
(Refer to
Replace the PF encoder disk.
Replace the Carriage PCB ASSY.
Replace the Maintenance unit.
Replace the Head/carriage unit.
Replace the Main PCB ASSY.
2-58
Solution
Section 4.3.2 in this chapter)
"Chapter 5, Section
Solution
Section 4.3.2 in this chapter)
Chapter 5, Section 1.4.17)
Chapter 5, Section 1.4.32)
Chapter 4, Section 2.4)
Chapter 5, Section 1.4.2)
"Chapter 5, Section
Chapter 3, Section 1)
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