Gestetner G060 Service Manual page 237

1) Drum charge:
The charge roller gives the drum a negative charge
2) Laser exposure:
The laser beam from the laser diode (LD) goes through the lens and
mirrors and reaches the drum. Turning the laser beam on and off, and
creates a latent image on the drum.
3) Development:
The development roller carries negatively charged toner to the latent image
on the drum surface. This machine uses four independent development
units (one for each color).
4) Image transfer:
The charge applied to the transfer brush attracts the toner from the drum to
the paper. Four toner images are super-imposed onto the paper.
5) Cleaning for OPC drum:
The cleaning brush and blade remove any toner remaining on the drum
surface after image transfer to the paper.
6) Quenching for OPC drum:
Quenching is done by illuminating the whole area of the drum with the laser
at the end of every job.
7) Paper attraction:
Paper is attracted to the transfer belt by the charge applied to the paper
attraction roller.
8) Separation:
Paper separates from the transfer belt when the belt curves away from it.
9) Cleaning and quenching for transfer belt:
The cleaning roller cleans the belt surface. The grounding roller inside the
transfer belt unit removes the remaining charge on the belt.
10) ID sensor:
The ID sensor board contains two ID sensors (one at the front, and one at
the rear). The ID sensor detects the density of the ID sensor pattern on the
transfer belt. The ID sensor output is used for process control and for
automatic line position, skew, and color registration adjustments for the
latent image.
SM 6-7
OVERVIEW
G060