Lexmark T652 Service Manual - Page 289
Lexmark T652 Manual
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4062-XXX 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 Control Printhead control Rotation of printhead motor The on/off control of the printhead motor is performed according to the mode of operation as shown below. Operation mode Standby mode Print mode PRINTHEAD motor on/off Always off Turns on upon receiving the signal from the controller, and turns off after a preset time has passed from the end of printing. Also turns off if a print command is not received within 30 seconds from the reception of the signal. Always off Sleep mode 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 Ready reference value Fail reference value Description SOS signal interval (equivalent to 98% or more of the rated RPM of the printhead motor) SOS signal interval (less than 98% of the rated rpm of the printhead motor) Fuser control Fuser control method The on/off 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. The fuser temperature control starts when the fuser ready in the system card assembly is turned on after a preset time period has passed from power on. If a failure occurs, the heater lamps are turned off, the fuser ready is turned off, and then the fuser temperature control is stopped. Fuser lamp on/off control The thermistor detects the heat roll surface temperature (fuser temperature) to regulate the temperature at the target control temperature by turning on or off the heater lamp. Diagnostic aids 3-77