Lexmark X 850 Owners Manual
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General information1-19 7500-XXX 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 Exit 1 ejects printed media from the printer to the standard bin 1. With the exit 2 installed, it is also possible to eject media to the standard bin 2 by changing the orientation of the diverter gate on the exit 1. Dual drive motor assembly Drives the exit 1 media exit roll assembly that feeds media to each bin. Exit 1 media exit roll assembly The exit 1 media exit roll assembly feeds printed media from the fuser to the standard bins. Sensor (standard bin full exit 1) The sensor (standard bin 1 full) detects whether the exit1 face down tray is full by moving the actuator up and down. Sub heater lamp 2Pressure rollPressure roll thermistorCenter thermistor Rear thermistor Heat roll Thermostat Main heater lamp Sub heater lamp 1 Front
1-20MFP Service Manual 7500-XXX Media diverter gate The media diverter gate switches the media transport path. When the media diverter gate is lifted, media is fed to the standard bin exit 1. When it is lowered, media is fed to the standard bin exit 2. Sensor (standard bin full exit 1)Media diverter gate Exit 1 media exit roll asm Dual drive motor asm Rear
General information1-21 7500-XXX Drive Media transport motor The media transport motor is a DC brushless motor that drives the exit 1 media exit shaft assembly, fuser assembly, registration roll assembly. PC cartridge motor The PC cartridge motor is a DC brushless motor that drives the PC cartridge, mag roll and transfer roll assembly. Media transport motorPC cartridge motor Dual drive motor assembly Rear MPF/transport motor assembly
1-22MFP Service Manual 7500-XXX 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 main LVPS (low voltage power supply) 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 (PC Cartridge interlock) The switch (PC interlock) 5 V interlock is a safety switch to cut off a 5 VDC power supply from the LVPS card assembly to the printhead while the PC cartridge is removed. 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. LVPS card assembly The LVPS card assembly generates low voltages (5 V and 3.3 V for logic circuits, 5 V for laser diodes, and 24 V for motors/clutches) from AC power. It also contains the fuser relay to feed/cut off AC power to the heater lamps of the fuser assembly. HVPS card assembly The HVPS card assembly generates AC power, a high DC voltage, and feeds them to the charge roll, development (magnet roll), transfer roll assembly. Printer engine card assembly The printer engine card assembly controls printing operation based on the communication with the RIP card assembly and on sensor/switch information. It also controls optional module boards. RIP card assembly The RIP card assembly connected to the printer engine card assembly controls the entire system. Transport roll assembly The transport roll assembly feeds media from tray2, 3, and 4 to the registration roll assembly.
General information1-23 7500-XXX Registration roll assembly The registration roll assembly feeds media from all trays to the PC cartridge or fuser. Switch (printer left door interlock) Fuser cooling fan AC drive card assembly Switch (printer left lower door interlock) Printer engine card asm Rear AC power input socket HVPS LVPS Switch (printer front door interlock)Switch (main power)Switch (PC cartridge interlock) Registration clutch Registration roll assembly Sensor (registration) Transport roll assembly Front
1-24MFP Service Manual 7500-XXX 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. 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
General information1-25 7500-XXX 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. 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 LVPS 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 center 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. 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 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)
1-26MFP Service Manual 7500-XXX Xerographic Process During a Print Cycle Charge roll Transfer roll PC cartridgeFuser ASM Magnetic roll PaperLaser beam Heat roll Pressure roll Cleaning blade Drum
General information1-27 7500-XXX Charge The Charge Roll places a uniform negative electrostatic charge on the surface of the drum. The drum surface is made of a photoconductive material that holds an electrical charge as long as the drum remains in darkness. Light striking the drum discharges the surface charge. HVPS (-VDC) (-VDC) Ground Conductive Tube Photoconductive Surface 0V-VDC value DRUM Drum Surface Voltage Drum Surface Image Ground Charge roll
1-28MFP Service Manual 7500-XXX The charge roll is a conductive roll that is positioned slightly above the surface of the drum. The HVPS supplies the charge roll with two voltages; a negative DC charge voltage and an AC discharge voltage that is used for electrically cleaning the drum. Exposure The Printhead generates a beam of laser light. Image data received from the RIP card assembly modulates this beam, turning it on and off according to image information that is received from the host computer and software. Through the use of a series of rotating and stationary mirrors within the Printhead, the beam scans the negative charged drum surface. Whenever the print controller sends a command to print a black pixel, the laser switches on long enough to shine onto the drum at a single pixel point. That point is now discharged and slightly less negative than the surrounding negative charge. The less negative areas are considered positive. This discharge/no discharge process creates an invisible, electrostatic image on the surface of the drum. This image is called a latent image. HVPS (-VDC) (-VDC) Ground Conductive Tube Photoconductive Surface 0V-VDC value DRUM Drum Surface Voltage Drum Surface Image Ground Charge roll