Control System; 1 ] Control Of The Print Process - Brother MFC-9420CN Service Manual

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
Video
Controller
Paper Sensor (F.CL)
Oil Sensor (OIL)
Fusing Unit
(1) Control Block Diagram (Refer to Fig.3-33.)
No.
1 Sequence Control
2 Temperature Control
3 Consumables' Life Control
4 Operator Panel Control
5 Error Processing Control
6 Interface Control
7 Laser Control
Main Cooling
Motor 2 Fan OZ
Control
Panel
MCTL (Engine Controller)
I/F
Control
DC Power
Supply Unit
Interlock Switches
Fig. 3-33
Name
3 - 3 2
manuals4you.com manuals4you.com
Cooling
DM
Fan (EX) 2
Belt Drum
Sensor
Sensor
Sequence Control
Temperature Control
Toner Empty Sensing Control
Control Panel Control
Error Processing Program
Paper Sensor (P.EN)
High Voltage Unit
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)
Temperature Sensor for Fusing Unit
Function
To control the print sequence of machine.
To control the temperature of fusing unit.
To control the toner empty status and the life of
periodic replacement parts.
To control the operator panel indication and the
operation signals.
To sense the errors occurring in the machine and the
stop procedures.
To control the receipt and transmission of the
interface signals from the external controller.
To control the laser scanning and laser power.
Scanner
Motor
ATC (4 pcs.)
LDU
PDU
Y M C K
Laser Control
CPU
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
Confidential