Power Supply; Protective Mechanisms - Sharp AR-FN8 Service Manual

VII. POWER SUPPLY
1. Outline
When the host machine power switch is turned ON, two 24V power lines are supplied by the
finisher controller PCB.
The 24V line is used to drive motors and solenoids. The 24V power from the finisher controller
PCB to solenoids does not pass through any protective mechanisms (microswitches, or the like).
The 24V power to motors, on the other hand, will not be supplied if any of the three door
switches is open. Another 24V line is used to generate 5V to the sensors.
Finisher
controller
PCB
2.

Protective Mechanisms

The 24 VDC power supply used for motors and solenoids is equipped with a circuit breaker
(CB1). The 24V power supply used to drive the feed motor (M1S), guide motor (M3S), and the
paper positioning plate motor (M4S) is equipped with a fuse designed to blow when an overcurrent
flows.
CHAPTER 3 SADDLE STITCHER UNIT BASIC OPERATION
Inlet door
switch
Circuit
breaker
24VR
Regulator IC
Figure 3-701
Front door
Delivery
switch
door switch
Saddle stitcher
controller PCB
(Q6)
24U
Motor systems
24S
Motor systems
24V
Solenoids
Sensors
Logic
3-45