Service manual

OVERVIEW
SM 6-7 G130/G131
Detailed
Descriptions
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. The machine turns the laser beam on and off to make 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 given to the transfer roller 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 remaining toner 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 given 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 brush and blade clean 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 three ID sensors (front, center, and rear). The ID
sensor detects the density of the ID sensor pattern on the transfer belt. The ID
sensor output is used for the following:
• Process control and for automatic line position
• Skew
• Color registration adjustments for the latent image.