Horizontal Lines; One Color Band - Brother MFC-9130CW Service Manual

■ One color band

<User Check>
- Clean the inside of the machine and the corona wire of each drum unit for all four colors.
- Return the cleaning tab of the corona wire to the
- The paper tray ground terminal provided in the main body may be dirty. Clean the contact
with a dry cloth.
- Refer to the User's guide and remove the dirt on the exposure drum using a cotton swab.
- Replace the drum unit or toner cartridge with a new one.
- Clean the LED ASSY.
Step
1 LED flat cable connection
failure
2 LED flat cable failure
3 Bend of tray ground spring
4 LED ASSY failure
■ Downward fogging of solid color
<User Check>
Step
1 High-voltage power supply
PCB failure
2 Main PCB failure

■ Horizontal lines

Step
1 Dirt on charged electrode
2 Scratch and dirt on fuser unit
3 High-voltage power supply
PCB failure
Cause
- Replace the toner cartridge with a new one.
Cause
<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 or toner cartridge with a new
one.
Cause
2-99
position.
Remedy
Reconnect the LED flat cable correctly.
Replace the LED flat cable.
Replace the paper tray.
Replace the LED ASSY.
Remedy
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Wipe dirt off.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Confidential