Horizontal Lines - Brother FAX-2840 Service Manual

Black band
<User Check>
- Clean inside the machine and the corona wire of the drum unit. If the
- The paper tray earth spring on the machine side may be dirty. Clean
Step
Bend of tray earth spring
1
Downward fogging of solid color
<User Check>
- Replace the toner cartridge with a new one.
Step
High voltage power supply PCB
1
failure
2 Main PCB failure

Horizontal lines

Step
Dirt on electrodes of the drum unit
1 and those of the machine
Bend of tray earth spring
2
3 Laser unit failure
Scratch and dirt on the heat roller
4 (horizontal lines at intervals of 53.4
mm)
same problem occurs after cleaning, replace the drum unit with a
new one.
it with a dry cloth.
Cause
Cause
<User Check>
- The paper tray earth spring on the machine side may be
dirty. Clean it with a dry cloth.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
2-74
Remedy
(1) Correct bending of the tray earth spring.
(2) Replace the paper tray.
Remedy
Replace the high voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-11.)
(1) Correct bending of the tray earth spring.
(2) Replace the paper tray.
Replace the laser unit.
Replace the fuser unit.
Fig. 2-10 and
Confidential