Copier careXC23/XC33/XC33D User Guide 77Toner cartridge yieldThe main factor affecting toner cartridge yield is the printedarea of a document. The graph is a sample representationof how the number of copies per cartridge decreases as theprinted area increases. Other factors which can affect the toner cartridge yieldare: The size of the document being copied. Dark backgrounds. Leaving the platen cover open. The number of times the copier is switched on and off. Double sided copying will use more toner per ream ofpaper. High humidity.To get the most from your toner cartridge: Always copy with the document cover closed. Leave the copier on during the day. Switch off the copierat the end of the working day. Copy with the exposure control set to Auto exposureunless you need to adjust for the background of youroriginal. Operate the copier in a dry environment wheneverpossible.