Diagnostic aids 3-61System card assemblyThe system card assembly controls printing operation based on the communication with the RIP controller andoptional peripherals. It also controls toner dispense, fuser control, sensor switch feedback, drive motors,clutches and solenoidsControlPrinthead controlRotation of printhead motorThe on/off control of the printhead motor is performed according to the mode of operation as shown below.Determination of printhead readyThe printhead goes into ready state after the specified period passes since the reception of the printhead MPAstart signal and the SOS cycle exceeds the reference value.Printhead reference valueFuser controlFuser control methodThe on/off control of the main/sub heater lamps is performed based on the fuser control temperature. The fusertransmits between the five states (warm up, ready, standby, print, and low power) depending on the heat rollsurface temperature or printer conditions.The fuser temperature control starts when the fuser ready in the system card assembly is turned on after apreset time period has passed from power on. If a failure occurs, the heater lamps are turned off, the fuserready is turned off, and then the fuser temperature control is stopped.Fuser lamp on/off controlThe thermistor detects the heat roll surface temperature (fuser temperature) to regulate the temperature at thetarget control temperature by turning on or off the heater lamp.Operation mode PRINTHEAD motor on/offStandby mode Always offPrint mode Turns on upon receiving the signal from the controller,and turns off after a preset time has passed from theend of printing. Also turns off if a print command is notreceived within 30 seconds from the reception of thesignal.Sleep mode Always offPrinthead reference value DescriptionReady reference value SOS signal interval (equivalent to 98% or more of the rated RPM of theprinthead motor)Fail reference value SOS signal interval (less than 98% of the rated rpm of the printheadmotor)
