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You can specify how long it takes to refresh the drum automatically.
The drum may be refreshed automatically due to conditions such as temperature or humidity when the machine is turned on or recovers from the sleep mode.
Contact your service representative before using this function.
Select [Maintenance] 
Press [OK]
Select [Quality Maintenance] Press [OK]
Select [Auto Drum Refresh] Press [OK]
Specify how long it takes to refresh the drum automatically Press [OK]
