Power Supply; Power Supply Route; Protection Function - Canon Staple Finisher-AA1 Service Manual

Power Supply

Power Supply Route

The 24V are supplied to the buffer pass controller PCB through the buffer pass relay PCB and the buffer pass power supply PCB
in the buffer pass unit when the host machine is turned ON. The 24V is supplied from the buffer pass unit to the finisher controller
PCB.
The 24V is converted into 5V and 3.3V by the regulator IC on the finisher controller PCB. The 24V is used to drive the motors
and clutches and fan and the 5V is used to drive the sensors and switches and the 3.3V is used to drive the logic. The 24V is
shut down when the opening of the front cover or swing guide is detected by the front cover switch (SW101) or swing guide safety
switch (SW102).
The 24V is converted into 5VDC by the regulator IC on the saddle stitcher controller PCB to drive sensors. It is also converted
into 3.3VDC by the regulator IC on the saddle stitcher controller PCB to drive ICs on the PCB.
Host
Machine
Relay signal
Buffer Pass
Relay PCB
Buffer Pass Power
Supply PCB
24V
Motor Driver IC
Buffer Pass
Controller PCB
Regulator IC

Protection Function

The 24V circuits (used to drive the motors and clutches and fan) 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 each controller PCB is also provided with a fuse which is blown when an excessive current flows.
Buffer Pass
Unit
AC
AC
24V
Remote signal
Front Cover Switch
Swing Guide Safety Switch
24V
Motors
24V
Fans
3.3V
Sensors
3.3V
Logic
Finisher Controller PCB
Regulator IC
(SW101)
(SW102)
Regulator IC
Saddle Stitcher Controller PCB
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2. Technical Explanation
Finisher
3.3V
Regulator IC
Logic
5V
Sensors/Switches
24V
Fan
5V
Puncher Unit
24V
Motor
24V
Motors
Driver IC
24V
Clutches
Motor
24V
Motors
Driver IC
3.3V
Logic
5V
Sensor