Service manual

CHAPTER 3 THEORY OF OPERATION
3-10
1.4 Engine PCB
The gate array which transforms the serial signal from the main PCB into the parallel signal is
mounted on the engine PCB.
The engine PCB controls the following parts by using the transferred signal data;
• Main motor
• Solenoid
• Fan motor
• Upper cassette sensor
• Thermistor
• Lower cassette sensor
• Polygon motor • Upper paper exist sensor
• High-voltage power supply • Lower paper exist sensor
• Toner sensor • Lower cassette exist sensor
• Cover sensor • Paper eject sensor
• Front registration sensor • Fixing unit cover sensor
• Rear registration sensor • Multi-purpose tray paper exit sensor
For the circuit diagram of the engine PCB, see APPENDIX 4.8 and 4.9 ‘ENGINE PCB
CIRCUIT DIAGRAM’ in this manual.
Sensor configuration varies according to machine types.
DCP-8020/MFC-8420 DCP-8025D/8025DN
MFC-8820D/8820DN
Upper cassette sensor
Upper paper exit sensor
Multi-purpose tray paper exit sensor
DX sensor
DX paper select sensor
: Built-in : Not built-in