Hollow Print - Brother HL-4140CN Service Manual

■ Unstable color density
<User Check>
Step
1 Dirt on drum unit electrode
2 Dirt on toner cartridge
electrode
3 Dirt on belt unit electrode
4 Engine PCB failure
5 High-voltage power supply
PCB failure
6 Laser unit failure
7 Main PCB failure

■ Hollow print

<User Check>
Step
1 Dirt on the pinch roller of the
paper tray
2 Exposure drum dirty
3 Fuser unit failure
- Make a print on a different type of paper.
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
- Replace the waste toner box with a new one.
- Replace the toner cartridge with a new one.
Cause
- Select "Improve Toner Fixing" in the printer driver, or select "Thicker
Paper" in Paper Type.
- Check the printer's environment, conditions such as high humidity and
low humidity may cause this situation to occur.
- Make a print on a different type of paper.
- Refer to the User's guide and remove the dirt on the exposure drum
using a cotton swab.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
2-109
Remedy
Clean the electrodes of the drum unit and
main body. (Refer to Fig. 2-6 (P2-52)
Fig. 2-9 (P2-53))
Clean the electrodes of the toner cartridge
and main body. (Refer to
and Fig. 2-9 (P2-53))
Clean the electrodes of the belt unit and main
body. (Refer to Fig. 2-7 (P2-52)
(P2-53))
Replace the engine PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Remedy
Refer to Fig. 2-14 (P2-105)
pinch roller.
Refer to "2.8 Drum Cleaning" in Chapter 5
and perform drum cleaning.
Replace the fuser unit.
and
Fig. 2-6 (P2-52)
and Fig. 2-9
and clean the
Confidential