Brother HL-2440 Service Manual page 26

6) No paper fed manual feed slot
No paper in manual feeding
User Check
• Load the paper
Step
Harness connection failure of
1 registration front sensor PCB
ASSY
Registration front sensor PCB
failure
2
3 Toner LED PCB failure
4 Main PCB failure
7) Drum error
Dirt on drum unit
User Check
• Clean the corona wire in the drum unit.
• Replace the drum unit with a new one, and reset the drum counter.
Step
Dirt or dust on drum unit
1
electrodes
High-voltage power supply PCB
2
failure
3 Main PCB ASSY failure
Cause
Cause
1-11
Remedy
Check the harness connection of the
registration front sensor PCB ASSY.
Check the registration front sensor
performance following the procedure in
"Factory Inspection Mode"
If any problem occurs, replace the
registration front sensor PCB ASSY.
Replace the toner LED PCB ASSY.
Replace the main PCB ASSY.
Remedy
Clean the electrodes on the drum unit and
the machine body (Refer to
Replace the high-voltage power supply
PCB.
Replace the main PCB ASSY failure.
(Chapter 5).
Fig. 1-2).
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