Structure Of The Control System; Basic Structure; 1 ] Electrical System And Function; Electrical System And Function - Brother MFC-9420CN Service Manual

3.3 STRUCTURE OF THE CONTROL SYSTEM

3.3.1 Basic Structure

[ 1 ]

Electrical system and function

Most of the main electrical parts of this machine are controlled by the MCTL (engine controller)
PCB.
<Structure of the Sequence Control>
The basic structure of the sequence control is shown in Fig.3-28.
Print Process Control:
Laser Output Control:
Fuser Temperature Control:
Toner Sensing Control:
Interface Control:
(Video Signal)
Control Panel Indicator:
Error Control:
To control the print process from the paper feed through
paper exit.
To control automatically the laser output to the default.
To control the fuser heater so that temperature of fuser
roller and back-up roller will be the default.
To control the sensing procedures of toner empty status.
To process the input and output signal with the external
controller (host).
To display the machine operation status in the operator
panel indicator.
To control the safe stop procedures when errors occur in
the machine.
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