Power Supply; Power Supply Route (Finisher Unit); Power Supply Route; Protection Function - Canon J1 Service Manual

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Technology > Power Supply > Power Supply Route (Saddle Stitcher Unit) > Protection Function

Power Supply

Power Supply Route (Finisher Unit)

■ Power Supply Route

When the power of the host machine is turned on, 24VR and 24VU are supplied from the host
machine to the Finisher controller PCB.
24VU is used to drive motors and solenoids, and 24VR is converted into 5VDC by the
regulator IC (IC3) on the Finisher controller PCB and used to drive the sensors on the PCB.
Furthermore, it is converted into 3.3VDC by the regulator IC (IC26) on the Finisher controller
PCB and used to drive the ICs on the PCB.
Both 24VR and 24VU are also supplied from the Finisher controller PCB to the Saddle
Stitcher controller PCB.
If the Puncher unit, which is an optional, is installed, they are supplied to the punch controller
PCB as well.
24VU power for motor drive is shut down when the front cover switch (MSW101) is open.
This is not applicable for 24VU power for the optional puncher unit.
Front cover
switch (MSW101)
Saddle stitcher
controller PCB
24VU
Finisher controller PCB
Host
machine
(IC3)
24VR
Regulator IC Regulator IC

■ Protection Function

The 24 VDC for motor and solenoid drive has a fuse or motor driver with over-current
protection function for over-current protection.
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Technology > Power Supply > Power Supply Route (Saddle Stitcher Unit) > Protection Function
24V
Motor
24V
Motor
24V
Solenoid
5V
Sensors
(IC26)
3.3V
Logic
Punch controller PCB
(Puncher Unit (option))
F-2-83

Power Supply Route (Saddle Stitcher Unit)

■ Power Supply Route
24VR and 24VU are supplied from the finisher controller PCB as saddle stitcher power when
the power switch of the host machine is turned on with the door closed.
24VU is used to drive motors and solenoids.
24V power supply to solenoids is supplied from the Finisher controller PCB without passing
through protection mechanisms such as microswitches.
24VR is converted into 5VDC by the regulator IC (IC6) on the Saddle Stitcher controller PCB
and used to drive sensors, and then converted into 3.3VDC by the regulator IC (IC23) on the
Saddle Stitcher controller PCB and used to drive the ICs on the PCB.
Front cover
switch
(MSW101)
24V
24VU
FUSE
(FU3)
Finisher
controller
Saddle stitcher
PCB
controller PCB
(IC6)
24VR
Regulator IC
■ Protection Function
The 24 VDC for motor and solenoid drive has a fuse (FU3) or motor driver with over-current
protection function for over-current protection.
2-39
24V
Motors
24V
Solenoids
5V
Sensors
(IC23)
3.3V
Logic
Regulator IC
F-2-84
2-39