Xerox PHASER 3124 Service Manual page 110

General Procedures and Information
Paper Feed Sensor
When paper passes the feed sensor actuator after paper has been fed, a signal is detected by the
feed sensor and sends a signal to the CPU.
If a signal is not received by the CPU from the feed sensor after the paper has been fed, an error
occurs.
Paper Empty Sensor
The paper in the cassette is detected by a paper empty sensor mounted on the HVPS while the
paper empty actuator sensor and the actuator mounted to a frame. Paper senses the on/off time
of the empty sensor by using CPU and informs the normal operation status and the jam occur-
rence status to CPU.
Cover Open Sensor
The front cover open sensor is located on the HVPS. When the front cover is open, +24V supplied
to each unit (DC fan, solenoid, main motor, LSU polygon motor unit, fuser assembly, and HVPS)
is interrupted.
The exit cover open sensor is located on the SMPS. When the jam cover is open, +24V supplied
to each unit (DC fan, solenoid, main motor, LSU polygon motor unit, fuser assembly, and HVPS)
is interrupted.
D0 bit of the CPU detects the an open cover. The D7 bit of the CPU detects the existence the toner
cartridge. It informs the status to the user by switching on the red LED.
Solenoid Driving Circuit
The solenoid consists of two used for paper pick-up and MP signal. D4 bit of the CPU turns it on
or off. The driving time is 300ms. The diode protects the drive TR from pulse (noise) generated by
the de-energizing operation of the solenoid.
SMPS
The SMPS supplies DC power to the system.
It takes 110V/220V and produces +5V and +24V to supply power to various parts of the printer. It
consists of the AMPS, which supplies DC power to drive the system, and the AC heater control,
which supplies power to the fuser.
SMPS Specifications
• AC Input
Input Rated Voltage : AC 220V ~ 240V AC 120V / AC 220V(EXP version)
Input Voltage fluctuating range : AC 90V ~ 135V / AC 180V ~ 270V(EXP version)
Rated Frequency : 50/60 Hz
Frequency fluctuating range : 47 ~ 63 Hz
Input current : Under 4.0Amps / 2.5Amps
(But, the status when lamp is off or rated voltage is inputted/outputted)
6-16 09/06 PHASER 3124 / PHASER 3125