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If print density decreases or printed characters are blurred after a large number of documents are printed at one time, toner can be refilled forcibly. To start a toner refill, it is needed to open and close the cover or turn the machine off then back on.
Contact your service representative before using this function.
Select [Maintenance] 
Press [OK]
Select [Quality Maintenance] Press [OK]
Select [Add Extra Toner] Press [OK]
Select [OK] Press [OK]
Select [Exit] Press [OK]
