Power Supply; Power Supply Route; Protection Function - Canon 2/3 Hole Puncher Unit-A1 Service Manual

Power Supply

Power Supply Route

The 24V and 5V are supplied to the puncher controller PCB through the finisher controller PCB when the host machine is turned
on.
The 5V is converted into 3.3V by the regulator IC (IC5) on the puncher controller PCB. The 24V is used to drive the motors and
the 5V is used to drive the sensors and the 3.3V is used to drive the logic.
Finisher
Controller PCB

Protection Function

The power input circuit of the puncher controller PCB is provided with a fuse which is blown when an excessive current flow. And
the 24V circuit for driving the motor is provided with the motor driver with an overcurrent protective function to protect from the
over current.
Puncher Controller PCB
(IC5)
(FU1)
5V
Regulator IC
Fuse
(FU2)
Fuse
(IC14)
(FU3)
24V Motor
Driver IC
Fuse
Puncher Relay PCB
33
2. Technical Explanation
3.3V
Logic
5V
Sensors
5V
Sensors
24V
Motor
24V
Motor