Brother MFC-9340CDW - (Even Though Drum Counter Is Reset, Replace Drum Warning Remains.); Drum Error; Drum Unit Replacement

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Confidential
4.7.4 Drum error
<User Check>
- Clean the corona wire of each drum unit for all four colors.
- Replace the drum unit with a new one and reset the drum counter.
4.7.5 Drum unit replacement
(Even though drum counter is reset, "Replace Drum" warning remains.)
Step Cause Remedy
1 Dirt on the GRID electrodes of
the drum unit
Clean the GRID electrodes of the main body
and the drum unit.
(Refer to fig. 2-7 (P2-50) and fig. 2-8 (P2-51))
2 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
3 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1 Dirt on the GRID electrodes of
the drum unit
Clean the GRID electrodes of the main body
and the drum unit.
(Refer to fig. 2-7 (P2-50) and fig. 2-8 (P2-51))
2 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
3 Main PCB failure Replace the main PCB ASSY.