LVPS card assembly
The LVPS card assembly generates low voltages 5V for logic circuits, 5V for laser diodes, and 24V for cooling
fans. The LVPS is switchable and can be switched to work with 100V, 110V, and 220V machines.
HVPS card assembly
The HVPS card assembly generates AC power and feeds it to the developer roll, the transfer roll assembly, and
the charge roll assembly.
System card assembly
The system card assembly controls printing operation based on the communication with the RIP controller and
optional peripherals. It also controls toner dispense, fuser control, sensor switch feedback, drive motors,
clutches, and solenoids.
Printhead control
Rotation of printhead motor
The on/o control of the printhead motor is performed according to the mode of operation as shown below.
Operation mode Printhead motor on/o
Standby mode Always o
Print mode Turns on upon receiving the signal from the controller, and turns o after a preset time has passed
from the end of printing. Also turns o if a print command is not received within 30 seconds from
the reception of the signal.
Sleep mode Always o
Determination of printhead ready
The printhead goes into ready state after the
specified
period passes since the reception of the printhead MPA
start signal and the SOS cycle exceeds the reference value.
Printhead reference value
Printhead reference value Description
Ready reference value SOS signal interval (equivalent to 98% or more of the rated RPM of the printhead motor)
Fail reference value SOS signal interval (less to 98% or more of the rated RPM of the printhead motor)
Fuser control
Fuser control method
The
on/o
control of the main/sub heater lamps is performed based on the fuser control temperature. The fuser
transmits between the five states (warm up, ready, standby, print, and low power) depending on the heat roll
surface temperature or printer conditions.
4062
Appendix C: Theory of operation
537
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