3BN/3A4
2-3-1
2-3-1 Main PCB
Figure 2-3-1 Main PCB block diagram
The main PCB (MPCB) consists mainly of the CPU IC5 and driver drive circuit.
The CPU IC5 detects the condition of the switches and sensors and controls the motors and solenoids by serially
communicating with the copier. The paper conveying motor (PCM), switchback solenoid (SBSOL) and feedshift solenoid
(FSSOL) operate with the control signals from the copier.
Paper conveying
motor,
feedshift solenoid,
switchback
solenoid
Solenoids
Main PCB
Copier
Driver drive
circuit
CPU (IC5)
TXD
RXD
Motors
Switches
and
sensors
Buffer IC12,
IC13, IC14
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