Lexmark X940e Owners Manual
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General information1-19 7510 Go Back Previous Next Pressure belt The pressure belt is used to apply pressure to the media surface for fusing. Pressure is applied to the media between the pressure belt and heat roll, pressing the melted toner against the media. Heater lamp The heater lamp is a quartz glass tube containing a heater coil. A terminal is mounted to the end of the heater rod via a harness. Two heater lamps are used: the main heater lamp to heat the entire heat roll, and the sub heater lamp to heat the central portion of the heat roll. Thermostat If the heat roll temperature exceeds the preset temperature, the thermostat cuts off the circuits of the main heater lamp and sub heater lamp. Front thermistor The front thermistor monitors the surface temperature of the media-feed portion of the heat roll to control on/off of the main heater lamp and sub heater lamp. Rear thermistor The rear thermistor monitors the surface temperature at the rear side of the heat roll to switch the heater lamp to on. Fuser exit sensor The fuser exit sensor detects the arrival of media at the detection point in the exit area of the fuser, and also detects the ejection of media from this point. Exit The standard media exit ejects printed media from the printer to the standard bin 1. Heater lamps Front thermisterThermistatRear thermister Standard media exit shift motorStandard media exit roll assembly Sensor (standard bin full)
1-20Service Manual 7510 Go Back Previous Next Standard media exit roll assembly The media exit roll assembly feeds printed media from the fuser to the standard bin. Sensor (standard bin full) The sensor (standard bin full) detects whether the standard bin is full by moving the actuator up and down. Standard media exit shift motor The standard media exit shift motor allows the standard media exit roll assembly to shift back and forth to perform off-set sorting. Duplex diverter gate The duplex diverter gate switches the media transport path. When the duplex diverter gate is lifted, media is fed to the standard bin. When it is lowered, media is fed to the duplex. Drive K developer/transport drive motor assembly The K developer/transport drive motor is a DC motor that drives the K developer unit assembly, registration roll, 2nd transfer roll, fuser and standard media exit rolls. MPF/transport drive motor Inverter reverse clutchInverter forward clutch Standard media exit roll assembly Duplex diverter solenoid Sensor (duplex wait)Switch (duplex left door interlock) Duplex media transport roll assembly Duplex drive motor Duplex diverter gate
General information1-21 7510 Go Back Previous Next The MPF/transport drive motor is a stepper motor that drives the MPF unit assembly and media transport roll. CMYK PC cartridge drive motor assembly The CMYK PC cartridge drive motor assembly uses dual DC brushless motors that drive the four drums in the four PC cartridges. K developer/transport drive motor assembly MPF/transport drive motor K drive motor CMY drive motor
1-22Service Manual 7510 Go Back Previous Next CMY developer drive motor assembly The CMY developer drive motor assembly uses a DC brushless motor to drive the three color developer unit assemblies. K developer clutch This clutch is used to engage the K developer unit assembly and is driven by the K-developer transfer drive motor assembly. CMYK toner add motor assembly K developer clutch CMY developer drive motor assembly Y toner add motor Y toner add assembly M toner add motor M toner add assembly C toner add motor C toner add assembly K toner add motor K toner add assembly
General information1-23 7510 Go Back Previous Next The CMYK toner add motor assembly consists of 4 separate DC motors. Each color of toner has its own motor that is used to rotate the toner auger inside the toner cartridge and drive the auger inside the toner add assembly. Waste toner agitator motor assembly The waste toner agitator motor assembly is used to rotate an auger inside the waste toner cartridge in order to distribute collected waste toner evenly to prevent spillage and overflow. Electrical components and controller Switch (main power) Turning on/off the switch, power supplies/cuts off the main power of the printer. Finisher AC output Supplies power to the finisher from the AC drive card assembly. Switch (printer front door interlock) and switch (printer left door interlock) The switch is a safety switch to cut off a 24 VDC power supply from the LVPS card assembly to the high volt power supply (HVPS) card assembly, printer engine card assembly and to the dual motor assembly, while the printer front door assembly and the printer left door assembly are open. Switch (printer left lower door interlock) The switch (left lower door interlock) detects open or close of the printer left lower door assembly. Fuser cooling fan The fuser cooling fan discharges air from the printer to prevent excessive temperature increase. AC drive card assembly The AC drive card assembly accepts the main source voltage and distributes it to secondary power supplies and circuit boards. It also contains the fuser relay to feed/cut off AC power to the heater lamps of the fuser unit assembly. Switch (waste toner cartridge interlock) Sensor (waste toner cartridge full) Waste toner agitator motor assembly
1-24Service Manual 7510 Go Back Previous Next 5V LVPS card assembly The LVPS card assembly generates low voltages 5V for logic circuits, 5 V for laser diodes from AC power. 24V LVPS card assembly The LVPS card assembly generates 24 V for motors/clutches from AC power. CMYK transfer roll HVPS card assembly The CMYK transfer roll HVPS card assembly generates AC power and feeds it to the CMYK transfer rolls inside the transfer belt unit assembly. Developer roll HVPS card assembly The HVPS card assembly generates AC power and feeds it to the four developer rolls, the transfer belt unit assembly and the 2nd transfer roll assembly Charge roll HVPS card assembly The HVPS card assembly generates AC power and feeds it to the four charge rolls. Charge roll HVPS card assembly Developer roll HVPS card assemblyCMYK transfer roll HVPS card assembly
General information1-25 7510 Go Back Previous Next Upper printer engine card assembly The upper printer engine card assembly controls printing operation based on the communication with the RIP card assembly and optional peripherals. It also controls toner dispense, erase lamps and fuser control. Lower printer engine card assembly The lower printer engine card assembly controls printing operation based on the communication with the RIP card assembly and on sensor/switch information. It also controls many of the drive motors, clutches and solenoids. RIP card assembly The RIP card assembly connected to the printer engine card assembly controls the entire system as well as the printhead operations. Rear Fuser cooling fan Rear upper cooling fan 24V LVPS cooling fan AC drive card Assembly Rear lower cooling fan RIP card cooling fan RIP card Assembly Upper printer engine card assembly Transfer belt drive motor cooling fan Laser diode card assembly Lower printer engine card assembly
1-26Service Manual 7510 Go Back Previous Next Control Media size control Media tray assembly feeding The following table gives the states (on/off) of the switches on the switch (media size), corresponding to the media sizes of the media tray assembly. Note: The switches on the switch (media size) are denoted by “S/W2”, “S/W4”, “S/W3”, “S/W5”, and “S/W1” respectively from the left side. 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. Media sizeAnalog switchDigital switch S/W1 S/W2 S/W3 S/W4 S/W5 No media tray assembly Off Off Off Off Off 5.5 X 8.5SEF/A5 SEF Off Off On Off Off B5 SEF Off Off On On On 8.5 X 13SEF Off On Off On Off 8.5 X 14SEF Off On Off On On A4 SEF Off On On Off Off 8.5 X 11SEF Off On On Off On A4 LEF On Off On Off Off A3 SEF On Off On On Off B5 LEF/executive LEF On On Off Off On 8K SEF(TFX/GCO) On On Off On Off B4 SEF On On Off On On 8.5 X 11LEF On On On Off Off 16K LEF(TFX/GCO) On On On Off On 11 X 17LEF On On On On On Operation mode PRINTHEAD motor on/off Standby mode Always off Print mode 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. Sleep mode Always off
General information1-27 7510 Go Back Previous Next 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 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 AC drive 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. Main/sub heater lamps on/off control The front and rear thermistors detect the heat roll surface temperature (fuser temperature) to regulate the temperature at the target control temperature by turning on or off the main/sub heater lamps. Fuser warm-up The fuser warm-up starts at the time of power on, interlock open or close, jam reset, or return from the low power mode, and ends when the ready temperature is attained, when a failure occurs, or when executing diagnosis.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 than 98% of the rated rpm of the printhead motor)
1-28Service Manual 7510 Go Back Previous Next Xerographic process during a print cycle K C M Y K toner C toner M toner Y toner 2nd transfer roll assembly Printhead Transfer belt Fuser Cleaning rollTransfer belt cleaning assembly Cleaning blade Photo conductor drum Charge roll Sensor (ATC) Erase Lamp Developer unit K transfer roll C transfer roll M transfer roll Y transfer roll Registration roll