Service manual

4. Development
The negatively charged toner is attracted to the latent image on the drum
surface. Toner particles are electrostatically attracted to the area of the
drum surface where the laser reduced the negative charge on the drum.
The development unit is a revolver-type, containing separate
development sections for each color toner.
5. Image Density Detection
When the laser forms a sensor pattern on the drum surface, the ID
sensor measures the image density of these patterns. The output signal
is used in process control to regulate toner supply.
6. Pre-transfer Lamp
After development, the pre-transfer lamp reduces the potential of the
image background, right before the first belt transfer (in 2C/3C/4C mode).
This ensures that electrostatic attraction between belt and drum is about
the same for each color toner transfer, which ensures that the color toner
images are synchronized properly.
7. Belt Transfer
Toner on the drum is attracted to the transfer belt by the belt corona unit.
8. Belt Lubrication
The transfer belt lubricant brush applies a small amount of lubricant to
the surface of the transfer belt. This aids the belt cleaning blade in
removing waste toner from the transfer belt.
9. Belt Cleaning
The cleaning blade removes any toner on the belt after paper transfer.
10. Drum Cleaning
The drum cleaning brush roller removes remaining toner from the drum.
The cleaning brush also applies lubricant. This aids in drum cleaning.
11. Quenching
The light from the quenching lamp electrically neutralizes the charge on
the drum surface. This prepares the drum for the next copy cycle.
12. Paper Transfer
When all toner has been transferred from the drum to the transfer belt,
the charged toner on the transfer belt is attracted to the paper by the
paper transfer unit. This charge is applied to the underside of the paper.
13. Paper Separation
The copy paper separates from the transfer belt due to the belt’s
curvature. This curvature allows the paper to naturally fall away from the
transfer belt. The discharge brush aids in the separation process by
discharging any remaining electric charge from the paper.
MACHINE CONFIGURATION
A166/A187/A189 1-12 SM
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA