Brother MFC-9420CN - Structure of the Control System; Basic Structure; 1 ] Electrical System and Function; Electrical System and Function

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3-25
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: To control the print process from the paper feed through
paper exit.
Laser Output Control: To control automatically the laser output to the default.
Fuser Temperature Control: To control the fuser heater so that temperature of fuser
roller and back-up roller will be the default.
Toner Sensing Control: To control the sensing procedures of toner empty status.
Interface Control:
(Video Signal)
To process the input and output signal with the external
controller (host).
Control Panel Indicator: To display the machine operation status in the operator
panel indicator.
Error Control: To control the safe stop procedures when errors occur in
the machine.