Brother HL-S7000DN Service Manual page 157

■ White spots
<User Check>
Step
1 Paper dust in the head and
platen
2 Dirt in the paper feed system
3 Dirt in the paper dust cleaning
roller
4 Clog of head pins
5 Old ink
6 Ink head failure
7 Ink full sensor failure
8 Engine PCB failure
9 Main PCB failure
- Perform head cleaning.
- Check whether ink cartridge exceeded maintenance period.
Cause
2-129
Remedy
Perform special high-speed purge 2 (HP2) to
remove paper dust in the head and platen.
Refer to "Cleaning procedure using the
cleaning sheet" and perform cleaning.
Refer to "Cleaning of the paper dust cleaning
roller" and clean the dirt in the paper dust
cleaning roller.
Refer to "Cleaning of the head surface"
perform cleaning.
Replace the ink specified for the product.
Replace the ink head.
Replace the sub tank ASSY.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
and
Confidential