Brother HL-L9300CDW - Page 128

2-108
Confidential
■ One color band
<User Check>
- Clean the corona wire of all four colors on the drum unit.
- Return the cleaning tab of the corona wire to the position.
- This symptom might stop occurring after making several prints.
- 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.
■ Downward fogging of solid color
■ Horizontal lines
Step Cause Remedy
1 Installation failure of each FG
wire and/or FG plate
(Grounding is not performed
correctly.)
Retighten the screws of each FG wire and/or
FG plate. Repair the bend of the tray ground
spring of the paper tray.
(Refer to Fig. 2-11 (P2-102).)
2 Dirt on the exposure drum Perform drum cleaning.
(Refer to “2.1 Drum Cleaning” in Chapter 5.)
3 Laser unit failure Replace the laser unit.
<User Check>
- Replace the toner cartridge with a new one.
Step Cause Remedy
1 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
2 Main PCB failure Replace the main PCB ASSY.
<User Check>
- This symptom might stop occurring after making
several prints.
- 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.
Step Cause Remedy
1 Dirt on charged electrode
Clean the electrodes of the drum unit and
main body.
(Refer to Fig. 2-6 (P2-57), Fig. 2-5 (P2-57).)
2 Dirt on the exposure drum Perform drum cleaning.
(Refer to “2.1 Drum Cleaning” in Chapter 5.)
3 Scratch and dirt on fuser unit Replace the fuser unit.
4 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.