Brother HL-4200CN Service Manual page 104

5.11 Electrical
5.11.1 Major functions
• Fan Rear
Discharges heat out of the printer to prevent too high temperature in the printer.
• Harness ASSY AC SW
Composed of the main switch and inlet and controls supply of AC power from the power
source to LVPS.
• LVPS
The LVPS is provided with two types, 100/120V and 230V.
Supplies AC power from the power source to the fuser ASSY heater and generates and
supplies stable low voltage DC power used for the logic circuit, etc.
LVPS contains control circuit for the heater of the fuser ASSY, in addition to the power
circuit.
• MCU HL-4200
Controls printing operation based on the communication with the print controller and
information from the sensor/switch. Incorporates functions of HVPS.
Major functions are as follows:
• Communication with the printer controller.
• Receive of information from the sensors or switches.
• Control of Scanner ASSY
Supplies high voltage to parts in the print head cartridge ASSY to perform charging,
development, primary transfer and secondary transfer of the print process to the
following parts in the ASSY.
• RTC
• Refresher
• Developer
• IDT 1
• PWBA HBN DRV
Controls parts of motor and so on by the signal from the MCU HL-4200 and sends
information from the sensors and switches to the MCU HL-4200. The power from the
LVPS is supplied to the MCU HL-4200 through this PWB. Also, the interlock switch is
mounted on this PWB.
Major functions are as follows:
• Recive of information from the sensors or switches.
• Control of toner motor in drive ASSY main, drive ASSY DEVE, fuser drive
• Distributing low voltage DC power outputted from LVPS to each component.
• Cutting off the 24VDC circuit by the interlock switch
• Controller board
Receives data from the host, prints and controls the whole printer.
• Font Card
Records font information of printer.
ASSY, motor ASSY DUP, and holder toner cartridge ASSY.
III-40
• IDT 2
• IDT 1 Cleaner
• IDT 2 Cleaner