Ricoh K-C3.5L Service Training page 21

Drum charge
Laser exposure
Slide 21
More on the Copy Process
The photoconductor unit (PCU) contains the drum, development roller, and
charge roller.
A charge roller gives the drum a negative charge.
The laser beam writes a latent image on the drum, switching on to discharge the
drum when writing black parts of the image. Toner is attracted to these
discharged parts of the drum.
The transfer roller applies a positive current to the reverse side of the paper (the
size of the current depends on the resolution and the paper size). This pulls the
toner off the drum and onto the paper.
The electrostatic pull from the transfer roller separates the paper from the drum.
There is also a discharge plate, which is grounded.
The quenching lamp removes residual charge from the drum.
The ID sensor and TD sensor are used for toner supply control.
Copy Process
Cleaning
Development
21
Model K-C3.5L
Paper separation
Image transfer