Service manual

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