To keep image density steady, this machine adopts a development system where toner is mixed with a certain amount of developer before writing and then used developer is replaced by new developer while operating.
- With the conventional two-component developer, image quality varies gradually as the carrier ages, and periodical developer replacement is essential to recover image quality. This has resulted in short replacement intervals and change in image quality each time the developer is replaced.
- The toner supply method used in this machine prevents carrier degradation in the developer unit by including a small amount of carrier in the toner bottle and using this to gradually replace the developer in the development unit. This also helps to keep the developer in good condition longer and to stabilize image quality. Toner contains some developer (the same proportion for all colors).