Brother MFC-9420CN - Control System; 1 ] Control of the Print Process

Confidential
3-32
3.3.2 Control System
[ 1 ] Control of the print process
A micro CPU mounted on the MCTL PCB controls the print processes.
<Print Sequence Diagram>
Host Computer
I/F
Control
Control
Panel
Cooling
Fan (EX) 2
Cooling
Fan OZ
Belt
Sensor
Drum
Sensor
DM
ATC (4 pcs.)
YMCK
Scanner
Motor
LDU
PDU
Laser Control
CPU
Sequence Control
Temperature Control
Toner Empty Sensing Control
Control Panel Control
Error Processing Program
Oil Sensor (OIL)
Fusing Unit
DC Power
Supply Unit
High Voltage Unit
Interlock Switches
Paper Sensor (P.EN)
Main
Motor 2
Paper Sensor (F.CL)
Paper Sensor (PT1)
Paper Size Sensor (PSU)
Paper Sensor (EXF)
OHP Sensor 3 (OHP)
Belt Sensor (DPJ)
Paper Sensor (F.CL)
Toner Key Sensor 2 (TNK)
Paper Sensor (D.EN)
Belt Sensor (PBS)
Oil Sensor (OIL)
Paper Sensor (PT2)
Waste Toner Sensor (WTS)
Toner Sensor ASSY
Developer Position Sensor
Paper Full Sensor
Temperature Sensor for Fusing Unit
Video
Controller
MCTL (Engine Controller)
Fig. 3-33
(1) Control Block Diagram (Refer to Fig.3-33.)
No. Name Function
1 Sequence Control To control the print sequence of machine.
2 Temperature Control To control the temperature of fusing unit.
3 Consumables' Life Control To control the toner empty status and the life of
periodic replacement parts.
4 Operator Panel Control To control the operator panel indication and the
operation signals.
5 Error Processing Control To sense the errors occurring in the machine and the
stop procedures.
6 Interface Control To control the receipt and transmission of the
interface signals from the external controller.
7 Laser Control To control the laser scanning and laser power.