Service manual

Chapter 9
9-3
F-9-2
9.2.1.2 High-Voltage Power Supply Circuit 0006-4213
The high voltage output circuit is built into the DC controller PCB.
The CPU on the DC controller PCB sends instructions for the generation of the following high voltages at specific
timing:
- primary charging roller bias (AC voltage + DC negative voltage)
- developing bias (AC voltage + DC negative voltage)
- transfer charging roller bias (DC positive voltage or DC negative voltage)
To NCU PCB
Analog
processor
PCB
Laser
scanner unit
Solenoids
Main motor
Control
panel PCB
NCU PCB
*3
ADF unit
*1
ADF motor
ADF sensors
Reader unit
slide detecting
switch
Reader motor
Sensors
P1
NF
Power supply PCB
F2F1
Low-voltage power
supply circuit
+3.3 V circuit
+ 5 V circuit
+12 V circuit
+24 V circuit
+24V
+12V
+5VS
+5V
+3.3VS
+3.3V
F101
+3.3V
+8V
+3.3V
+5V
+24V
+24V
+24V
+3.3V
+5VS
Modular jack
PCB
*3
Contact sensor
Sensor PCB
+5V
+8V
+24V
+3.3V
+3.3VS
+12V
+5V
Printer controller
PCB
*2
+5VS
+3.3VS
+24V
+5V
*1 : Only if equipped with ADF functions.
*2 : Only if equipped with printer functions.
*3 : Only if equipped with fax functions.
DC controller PCB
• Cassette paper sensor
• Paper leading edge
sensor
• LGL paper sensor
Fan
Manual feed tray
paper sensor
+3.3V
+3.3V
+24V
+24V
+24V
+5V
+3.3V
Image processor PCB
Delivery sensor
+3.3V