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3: Operation
Colorwriter LSR 2000 Printer
Service Guide
3-127
The power source in the printer uses a remote switch. The CPU in
the paper feeder driver PCB outputs the REMOTE signal to the
power source in accordance with a command from the printer and
turns the power supply ON/OFF.
+5V DC is used by the sensors and the ICs in the paper feeder
driver PCB, while +24V DC is used to drive the motors and the
solenoids.
The right door switch (SW302) is on the paper feeder driver PCB.
When the right door is opened, this switch is turned OFF to shut
off +24V supplied to the drive loads.
With the paper feeder installed in the printer, the AC power supply
is sent to the power source in the printer via that in the paper feeder.
If the power cable is connected to the AC inlet on the printer by
mistake, the AC power supply is not sent to the power in the paper
feeder, nor is +24V DC for the feeder generated. The paper feeder
driver PCB monitors the supply of 24V DC from the power source
and if 24V DC is not generated, it informs the mechanical
controller CPU in the printer of this error as a paper feeder 24V
failure. The mechanical controller notifies the DC controller, which
then reports it as an internal communication failure to the video
controller.