Horizontal Lines - Brother HL-4140CN Service Manual

■ Downward fogging of solid color
<User Check>
Step
1 High-voltage power supply
PCB failure
2 Engine PCB failure
3 Main PCB failure

■ Horizontal lines

Step
1 Dirt on charged electrode
2 Paper tray ground terminal
provided in printer body
3 Scratch on the heat roller
4 High-voltage power supply
PCB failure
■ Ghost
<User Check>
Step
1 Erase lamp lens dirty
2 High-voltage power supply
PCB failure
3 Engine PCB failure
4 Fuser unit failure
- Toner may be empty. Replace the toner cartridge with a new one.
Cause
<User Check>
- The paper tray ground terminal provided in the printer
body may be dirty. Clean the contact with a dry cloth.
- This symptom might stop occurring after making
several prints.
If the symptom continues, replace the drum unit
cartridge with a new one.
- Replace the toner cartridge with a new one.
Cause
- Check the printer's environment, conditions such as high humidity may
cause this situation to occur.
- Check that the appropriate media type is selected in the printer driver.
- Make a print in the color mode.
- Replace the drum unit with a new one.
Cause
2-107
Remedy
Replace the high-voltage power supply PCB
ASSY.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
Remedy
Clean the electrodes of the drum unit and
main body. (Refer to Fig. 2-6 (P2-52)
Fig. 2-9 (P2-53))
Correct bending of paper tray ground
terminal.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Remedy
Clean the erase lamp lens. (Refer to
(P2-52) and Fig. 2-9 (P2-53))
Replace the high-voltage power supply PCB
ASSY.
Replace the engine PCB ASSY.
Replace the fuser unit.
and
Fig. 2-6
Confidential