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Chapter 6 Principles of Operation
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 unit (IDT 1) is transferred
to the intermediate transfer unit (IDT 2).
(6) Cleaning: .......................... The intermediate transfer unit (IDT 1) 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.
Drum Y
Charged
with
electricity
Drum M Drum C Drum K
TRANSFER
ROLLER
( IDT1
→
IDT2)
Ten06014KA
(1)
Exposure
(2)
Secondary transfer
(5)
( IDT2
→
Paper)
Tertiary transfer
(7)
(6)
(8)
(6)
Develop-
ment
(3)
Cleaning
( IDT1)
Cleaning ( IDT2)
(9)
Static elimination
(10)
Fixing
Paper
(11)
Cleaning
(general)
Intermediate
transfer unit
( IDT1)
Intermediate
transfer unit
( IDT2)
Cleaning
( IDT1)
Intermediate
transfer unit
( IDT1)
(4)
Primary transfer
(Drum → IDT1)
Primary transfer
(Drum → IDT1)
(4)
Charged
with
electricity
(1)
Exposure
(2)
Develop-
ment
(3)
Charged
with
electricity
(1)
Exposure
(2)
Develop-
ment
(3)
Charged
with
electricity
(1)
Exposure
(2)
Develop-
ment
(3)
IMAGING DRUM