Brother International HL-2400C Service Manual - Page 76

2. 2.1 2.1.1 STRUCTURE OF THE CONTROL SYSTEM Basic Structure Electrical System and Functions Most of the main electrical parts of this printer are controlled by the MCTL (engine controller) PCB. The basic structure of the sequence control is shown in Fig.4-28.
Print Process Control: To control the print process from the paper feed through to the paper exit.  Laser Output Control: To automatically control the laser output.  Fuser Temperature Control: To control the fixer heater so that the temperature of the fuser roller and back-up roller will be correct.  Toner Sensing Control: To control the sensing of the toner empty status.  Interface Control: (Video Signal) To process the input and output signals to and from the external controller (host).  Control Panel Indicator: To display the printer operational status on the control panel indicator.  Error Control: To control the safety stop procedures when errors occur in the printer. IV-27