Printing Process; Summary Of Printing Process; Chapter Iii Structure Of System Components; Exposure - Brother HL-4200CN Service Manual

CHAPTER III STRUCTURE OF SYSTEM COMPONENTS

1.

PRINTING PROCESS

1.1

Summary of Printing Process

This printer is a "Full-color laser printer" which applies the principal of an
electrophotographic recording system. The tandem system comprising a drum and
developing unit respectively for each color of yellow, magenta, cyan and black (Y, M, C
and K) places toner image of each color on paper producing full-color prints finally
through 3 intermediate transfer units (IDT 1: 2, IDT 2: 1).
Printing processes of this printer is composed of the basic steps as follows.
1) Charging with electricity:
2)

Exposure:

3) Development:
4) Primary transfer:
5) Secondary transfer:
6) Cleaning:
7) Tertiary transfer:
8) Cleaning:
9) Static elimination:
10) Fixing:
11) Cleaning:
Drum surface is charged with electricity.
Image unit is exposed to laser beams.
Image is developed with toner.
Toner image is transferred to the intermediate transfer
unit (IDT 1).
Toner image on the intermediate transfer (IDT 1) is
transferred to the intermediate transfer unit (IDT 2).
Intermediate transfer unit (IDT 2) is cleaned.
Four-color finished toner image on the intermediate
transfer unit (IDT 2) is transferred onto the paper.
Intermediate transfer unit (IDT 2) is cleaned.
Electric charge of the paper is eliminated.
Toner on the paper is fixed by heat and pressure.
Remaining toner on the drum and intermediate
transfer units are collected.
III-1