Brother International HL-3400CN Service Manual - Page 79

CHAPTER

4

STRUCTURE

OF

SYSTEM

COMPONENTS

2.

STRUCTURE

OF

THE

CONTROL

SYSTEM

2.1

Basic

Structure

-

Electrical

System

and

Functions

Most

of

the

main

electrical

parts

of

this

printer

are

controlled

by

the

MCTL

(engine

controller)

PWB.

<Structure

of

the

sequence

control>

The

basic

structure

of

the

sequence

control

is

shown

in

Fig.4-28.

C)

Print

Process

Control:

O

Laser

Output

Control:

3

Fuser

Temperature

Control:

®

Toner

Sensing

Control:

C)

Interface

Control:

(Video

Signal)

6

Control

Panel

Indicator:

©

Error

Control:

To

control

the

print

process

from

the

paper

feed

through

to

the

paper

exit.

To

automatically

control

the

laser

output.

To

control

the

fixer

heater

so

that

the

temperature

of

the

fuser

roller

and

back-up

roller

will

be

correct.

To

control

the

sensing

of

the

toner

empty

status.

To

process

the

input

and

output

signals

to

and

from

the

external

controller

(host).

To

display

the

printer

operational

status

on

the

control

panel

indicator.

To

control

the

safety

stop

procedures

when

errors

occur

in

the

printer.

4-28

Brother International HL-3400CN Service Manual - Page 79

Structure, Control, System

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