Kyocera Mita DF-75, Service Manual

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CHAPTER 2 OUTLINE OF OPERATION
Finisher
controler PCB
Punch controller PCB
(puncher unit; option)
Host
machine
(IC1)
Circuit Breaker
(CB1)
24VP
24VL
Regurator IC
5 V
5 V
24 V
24 V
24 V
Clutch
Motor
Motor
Joint switch
(MS2)
Front door switch
(MS1)
Stapler safety switch
(MS3,4)
Sensor
Logic system
8 Power Supply System
8.1 Finisher/Saddle Assembly
8.1.1 Outline
When the host machine is turned on, it supplies the finisher controller PCB with two chan-
nels of 24 VDC; one is for the motors and clutches, and the other is turned into 5 VDC by the
regulator IC (IC1) of the finisher controller PCB for use by the sensors and ICs on PCBs.
If a punch unit (option) is installed, power is also supplied to the punch controller PCB.
Some of 24 VDC used to drive motors is cut off when the joint switch (MS2), front door
switch (MS1), or stapler safety switch (MS3) is open.
F02-801-01 is a block diagram of the power supply system:
F02-801-01
8.1.2 Protective Mechanisms
A circuit breaker (CB1) is monitored to protect the 24 VDC system sued to drive the motors
against overcurrent. The 24-V system used to drive the feed motor (M1), paddle motor (M2),
and delivery motor (M3) is equipped with a fuse which melts in the presence of overcurrent.