Brother International HL-3400CN Service Manual - Page 56

HL-3400CN

SERVICE

MANUAL

(

5

)

Control

System

The

control

system

consists

of

the

following

4

(four)

control

parts

and

runs

the

printer

by

processing

the

interface

signals

transmitted

from

the

Host

computer

and

interfacing

to

the

print,

transfer,

scanning

and

transport

systems.

•

Sequence

Control

•

Laser

Control

•

Fusing

Temperature

Control

•

Interface

Control

1.2

Basic

Mechanism

of

Color

Printing

1.2.1

Principle

of

color

printing

Color

printing

is

made

through

the

subtractive

process

by

combining

the

three

primary

colors,

yellow,

magenta,

and

cyan.

Fig.4-2

shows

the

three

primary

colors

and

subtractive

process:

B

M

C

K

R

G

Y

Fig.

4-2

Y:

Yellow

M:

Magenta

C:

Cyan

R:

Red

G:

Green

B:

Blue

K:

Black

1.2.2

Basic

color

printing

process

(a)

The

printer

has

a

toner

cartridge

of

each

color

yellow,

magenta,

cyan

and

black

as

shown

in

Fig.4-3.

(b)

The

toner

image

developed

using

the

primary

colors

is

transferred

to

the

transfer

drum

for

the

printed

color

combination

as

shown

in

Fig.4-4

a

(c)

The

toner

image

formed

on

the

transfer

drum

is

transferred

to

the

transported

paper

as

shown

in

Fig.4-4

a.

(d)

The

toner

on

the

paper

is

fused

by

the

thermal

fixing

unit

to

fix

the

toner

image

onto

the

paper

as

shown

in

Fig.4-4

0.

Summarizing

the

above

processes,

a

toner

color

layer

is

formed

on

the

transported

paper,

and

subsequently,

the

color

image

is

made

through

the

subtractive

process.

4-5

Brother International HL-3400CN Service Manual - Page 56

subtractive

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