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Confidential
Error code 7B and 7C
These errors do not usually occur in the normal use. The conceivable causes are noise
around the installation site, fluctuation of the power supply voltage, and failures in the
software.
An unidentified error occurred.
Error code 7D
Detected discharge that may be attributable to dirty corona wire on the drum unit.
Error code 7E
This error does not usually occur in the normal use. The conceivable causes are noise
around the installation site, fluctuation of the power supply voltage, and failures in the
software.
An unidentified error occurred.
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<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.
Drum Error
Open the Front Cover and slide the blue tab across the Drum Unit several times.
<User Check>
• Clean the corona wire of the drum unit.
• Turn OFF the power switch, and turn it ON again after a while.
Step Cause Remedy
1
Dirt on electrodes of the drum
unit and those of the machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 2-10 and
Fig. 2-11.)
2
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
3 Main PCB failure Replace the main PCB ASSY.
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<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.
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