Power Supply; Power Supply Route; Protection Function - Canon Unit-L1 Service Manual

Power Supply

Power Supply Route

The 24V and 5V are supplied from the Finisher Controller PCB. The 24V is used to drive the motors. The 5V is used to drive the
sensors and IC in the Paper Folding Unit Controller PCB.
The 24V to the motors is shut down when the opening of the Upper Cover is detected by the Top Cover Switch (SW1).
Finisher Controller PCB

Protection Function

The 24V circuits (used to drive the motors) are provided with the fuses or the motor drivers with an overcurrent protective function
to provide protection from the over current.
The power input circuit of the Paper Folding Unit Controller PCB is also provided with a fuse which is blown when an excessive
current flows.
Top Cover Switch
(SW1)
(FU4)
24V
Motor Drive
Motor Drive
(FU1)
Regulator IC
(FU2)
5V
Paper Folding Unit Controller PCB
28
24V
Motors
Circuit
24V
Motor
Circuit
3.3V
Logic
(FU6)
5V
Sensor
(FU9)
5V
Sensor
5V
Sensors
2. Technical Explanation
M1, M2, M3
M4
PS1
PS6
PS2, PS3, PS4, PS5