Lexmark X940e Owners Manual
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General information1-9 7510 Go Back Previous Next Media feed/lift motor This motor is activated to feed media and to lift the bottom plate. When feeding media, it rotates forward to drive the pick roll. When lifting the bottom plate, it rotates reversely to drive the tray module gears to lift the lift up shaft. Switch (media size) This switch (media size) sets the size of media supplied from each media tray assembly. A signal indicating the media size is transmitted as a voltage to the printer engine card assembly. Sensor (media out) If media runs out in a media tray assembly, the actuator lowers and the actuator flag, unlocks the sensing area of the sensor (media out). The sensor light is transmitted. When the sensing area is blocked (media is present), the signal is off. Sensor (media level) This sensor detects by the actuator position whether media in the media tray assembly is lifted. When the flag of the actuator unblocks the sensing area of the sensor (media level), the sensor detects that the media has been lifted. Sensor (feed-out) This sensor detects the media just after it is fed from the media feed unit. When the flag of the actuator unblocks the sensing area of the sensor (feed-out), the sensor detects that the media is present. The sensor (feed-out) is also used as a relay sensor along the media path up to the sensor (registration) in order for the engine to monitor media location. Multi-purpose feeder (MPF) Media feed lift motor Sensor (media level) Sensor (media out) Media feed unit asm Front Tray asmSwitch (media size)
1-10Service Manual 7510 Go Back Previous Next The MPF is a mechanical unit suppling media to the printer. The driving force from the MPF/transport drive motor is transmitted to the MPF feed roll to feed media. MPF feed roll The MPF feed rolls feed media set on the MPF and into the printer. MPF pick solenoid The MPF pick solenoid transmits the driving force from the MPF/transport drive to the MPF feed rolls. Sensor (MPF media out) The sensor (MPF media out) detects whether media is present on the MPF. Sensor (MPF media width) The MPF side guides detects the width (length in the main scanning direction) of media on the MPF. Media size The following table details the standard paper and envelope sizes supported by the Lexmark X945e MFPs and options. Media Width Length A4 210 mm 297 mm A5 148 mm 210 mm A3 297 mm 420 mm JIS B5 182 mm 257 mm JIS B4 257 mm 364 mm Letter 8.5 inches 11 inches Tabloid 11 inches 17 inches Legal 8.5 inches 14 inches Executive 7.25 inches 10.5 inches Folio 8.5 inches 13 inches MPF pick solenoid MPF pick rolls Sensor (MPF media out) Sensor (MPF media width)
General information1-11 7510 Go Back Previous Next Registration Sensor (registration) The sensor (registration) is located just before the registration roll assembly can detect whether media exists in the registration path. Sensor (transparency detect) This sensor is used to detect transparency media in order to automatically adjust feed speed, charge biases and fuser temperatures. Registration clutch The registration clutch transmits the drive force of the K developer/transport drive motor to the registration roll assembly. Media transport roll assembly The media transport roll assembly feeds paper from tray 2, tray 3 and tray 4 toward the registration roll assembly. Registration roll assembly Statement 5.5 inches 8.5 inches Universal MPF only140 to 297 mm 5.5 to 11.7 inches 105 to 305 mm 4.1 to 12 inches98.4 to 432 mm 3.9 to 17 inches 148 to 482 mm 5.8 to 19 inches 7 3/4 Envelope 98.4 mm 3.875 inches190.5 mm 7.5 inches 10 Envelope 104.8 mm 4.12 inches241.3 mm 9.5 inches DL Envelope 110 mm 4.33 inches220 mm 8.66 inches CS Envelope 162 mm 6.38 inches229 mm 9.01 inches Other Envelope 89 mm to 297 mm 3.5 to 11.7 inches98.4 to 431 mm 3.8 to 17 inches Transparencies (Letter and A4) 8.5 inches 210 mm11 inches 297 mm Media Width Length
1-12Service Manual 7510 Go Back Previous Next The registration roll assembly feeds the media at the precise moment to ensure that printed images are precisely placed. The registration roll assembly feeds media from all trays to the transfer belt. Transfer Transfer belt drive motor assembly This motor is used to rotate the transfer belt. Transfer belt cleaning assembly This assembly is used to remove residual toner images from the transfer belt after 2nd transfer and before the next print cycle. Registration clutch Sensor (transparency detect) Sensor (registration) Media transport roll assembly Transfer belt steering motorTransfer belt drive motor Transfer belt cleaning assembly 1st transfer rolls (C,M,Y,K) CMY transfer roll retract motor assembly Sensor (CMY transfer roll retract HP)
General information1-13 7510 Go Back Previous Next Transfer belt unit assembly The transfer belt unit assembly contains the four 1st transfer rolls; these 1st transfer rolls are referred to as the CMYK transfer rolls. The CMYK transfer rolls are positively charged to remove the developed toner image from the four drums. The negatively charged toner image is attracted by positive charges on the surface of the transfer belt. Thus, the toner image is transferred from the drum surface to the transfer belt surface. During black (K) only, operation the CMY transfer rolls are retracted to reduce wear on the transfer belt surface and CMY drums. Transfer belt steering motor This motor is used to ensure that the transfer belt is properly tracking. If the transfer belt starts to track off-center then the transfer belt steering motor will activate to keep the transfer belt centered and tracking properly. 2nd transfer roll assembly The 2nd transfer roll assembly applies positive charges to the rear surface of the media when the media passes between the 2nd transfer roll assembly and the transfer belt. The negatively charged toner image is attracted by positive charges on the surface of the media. Thus, the toner image is transferred from the transfer belt surface to the media surface. 2nd transfer roll retract motor The 2nd transfer roll retract motor is used to retract the 2nd transfer roll assembly when printing processes are not occurring.
1-14Service Manual 7510 Go Back Previous Next Sensor (2nd transfer roll HP) The sensor (2nd transfer roll HP) is used to detect the home position of the 2nd transfer roll assembly. Printhead assembly The printhead scans the four drum surface with four laser beams. It consists of four components: laser diode (LD) card assembly, printhead motor, polygon mirror, and four start of scan card assemblies. 1. LD card assembly — generates a laser beam with the four LDs. The beam is turned on or off according to a print data signal. The printhead contains 4 LD card assemblies for the colors CMY & K. 2. Printhead motor/polygon mirror — the polygon mirror is mounted to the shaft of the printhead motor, and is rotated at a high speed by the printhead motor. The mirror rotation shifts the incidence and reflection angles of a laser beam to scan the laser beam in the drum axial direction. The laser beam reaches the polygon mirror as it passes through multiple lenses, mirrors, and windows. The laser beam then arrives at the drum surface. 3. SOS card assembly — when a laser beam hits the SOS sensor on the SOS card assembly, the beam is converted to an electrical signal (SOS signal), and detects the initial position where a scan starts on each line. When a laser beam is scanned across the drum surface from one end to the other while turning on and off the beam, one line of latent image is created. If the scanning by the laser beam is repeated while rotating the drum, a two-dimensional image is created. The resolution in the scanning direction (from right to left) is determined by the rotational speed of the printhead motor, depending on how quickly the laser is adjusted. The resolution in the process direction (from top to bottom) is determined by the rotational speed of the printhead motor. (The higher the scanning speed becomes, the sooner the scanning of the next row can be started.) Sensor (2nd transfer roll retract HP) 2nd transfer roll assembly 2nd transfer roll retract motor Transfer belt
General information1-15 7510 Go Back Previous Next Conceptual diagram of an image created by scanning Printhead
1-16Service Manual 7510 Go Back Previous Next Y Laser Path Polygon MirrorY drum Sensor (Y start of scan) M Laser Path Polygon MirrorM drum Sensor (M start of scan)
General information1-17 7510 Go Back Previous Next Printhead shutter The printhead shutter tightly covers the slit glass through which laser beams from the printhead pass to write the four drums. To prevent the seal glass from becoming dirty, the shutter stays closed except when laser beams are written onto the drums. The printhead shutter motor assembly is used to prevent contamination from obstructing the printhead slit glasses. The printhead shutters for yellow, magenta, cyan and black are opened or closed simultaneously by the printhead shutter motor assembly. C Laser PathC drum Sensor (C start of scan) Polygon Mirror K Laser Path K drum Sensor (K start of scan) Polygon Mirror
1-18Service Manual 7510 Go Back Previous Next Fuser Heat roll The heat roll is a hollow metal tube with a coated surface. This tube is heated by the inner heater lamp. The heat is applied to the media passing between the heat roll and pressure roll, fusing the toner on the media. Fuser cooling fan Heat roll Sensor (fuser exit) Pressure belt Thumb screws