Power Supply System - Toshiba MJ-1027 Service Manual

CHAPTER 2 FINISHER UNIT BASIC OPERATION
III. POWER SUPPLY SYSTEM
1. Outline
The finisher controller PCB is supplied with 24 VDC power (and 5 VDC power) when the host
machine is turned on. 24 VDC one is used to drive the motor solenoids, while 5 VDC is used for
sensors and ICs on PCBs. Both lines are also used to feed power from the finisher controller PCB
to the saddle stitcher controller PCB. Power is also supplied to the punch driver PCB when the
optional puncher unit is mounted.
Some of the 24 VDC power used to drive motors is cut off when the door switch (MS1) is open.
The power to the saddle stitcher controller PCB, however, will not be cut off.
Figure 2-301 is a block diagram showing the power supply system.
J1-1
Host
machine
J2-6
2. Protection Functions
The 24 VDC power line used to drive motors and solenoids is equipped with a circuit breaker
(CB1) for protection against overcurrent. The 24 V line used to drive the first feed motor (M1),
alignment motor (M3), and stapler shift motor (M4) are equipped with a fuse, which is designed to
blow when an overcurrent occurs.
2-56
Saddle stitcher
controller PCB
(Saddle Stitch Finisher)
Circuit breaker
(CB1)
Finisher controller PCB
Figure 2-301
Door switch
(MS1)
Motor
Motor
Solenoid
Sensors
Logic
Punch driver PCB
(Puncher Unit (option))