Lexmark X 850 Owners Manual
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General information1-59 7500-XXX Media transport path The following is a cross section of the printer and the tandem tray module, showing the main components directly associated with the media path and transport. Functions of main components When the tandem tray module is installed under the printer, additional trays are available. Duplex media transport roll ASM MPF MPF Transport pinch roll MPF Transport roll ASM Transport roll ASM Media transport pinch roll Separation rollFeed roll Duplex media center transport roll ASM Duplex media transport pinch roll Duplex media transport roll ASM MPF pick rollRegistration roll ASM Pick rollRegistration pinch roll Drum Transfer roll ASM Heat Roll Exit 1 media exit pinch rolls Exit 1 media exit roll ASM Exit 2 media transport roll ASM Exit 2 media exit pinch rolls Exit 2 media exit roll ASM Pressure roll Exit 2 Duplex TR AY 4 TR AY 3 (TTM) Tandem tray Tray 4 transport roll ASM
1-60MFP Service Manual 7500-XXX Media tray assembly Media feed unit assembly It is necessary to adjust the front and rear side guides in the media tray assembly to match the media size. Front media guide / rear media guide The front media guide can be adjusted to different media sizes by moving it to the front or rear. These guides come into contact with the front and rear edges of the media and hold it in position. The rear side guide moves together with the front side guide. Bottom plate The force pushing up the bottom plate of tray 3 is transmitted by the driving force of the media feed lift motor on the media feed unit assembly to the media lift shaft assembly through the tray lift gear assembly 3. The bottom plate is lifted up via the rear tray cables, front right cable and front left cable by the rotation of the tray lift shaft assembly, which causes the supplied media to come into contact with the pick roll. The force pushing up the bottom plate of tray 4 is transmitted to the tray lift shaft assembly through the tray lift gear assembly 4. The bottom plate is lifted up via the front tray cables and rear tray cables by the rotation of the tray lift shaft assembly, which causes the supplied media to contact the pick roll. Tray 3 media tray assembly Front media guideRear lift cables Rear media guide Bottom plate F/R lift cable F/L lift cable
General information1-61 7500-XXX Tray 4 media tray assembly Media feed unit assembly Since the tray 3 and tray 4 are functionally equivalent in terms of the switch (TTM media size), sensor (media out), sensor (media level) and sensor (pre-feed), only the components of one tray are described here. The media feed unit assembly is a mechanical unit supplying media from the media tray assembly to the printer. The driving force from the media feed lift motor on the media feed unit assembly is transmitted to the three roll assemblies to feed media. When the pick roll picks up sheets of media and the remaining media decreases, the media level actuator of the sensor (media level) lowers accordingly. Media feed lift motor The media feed lift motor is activated to feed media and to lift the bottom plate. While feeding media, it rotates forward to drive the pick roll. When lifting the bottom plate, it rotates in reverse to drive the tray module gears to turn the lift up shaft. Switch (TTM media size) The switch (TTM media size) switches the setting of the size of media supplied from each media tray assembly. A signal indicating the set size is transmitted as a voltage to the printer engine card assembly. Sensor (media out) If there is no media in the media tray assembly, the media out actuator lowers and the flag of the media out actuator that has stayed in the sensor (media out) sensing area leaves there. Thus, the light of the sensor is transmitted. When the sensing area is blocked (media is present), the signal turns off. Front media guideRear lift cables Rear media guide Bottom plate F/R lift cable F/L lift cable
1-62MFP Service Manual 7500-XXX 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 leaves the sensor (media level) sensing area, the sensor detects that the media has been lifted. Sensor (pre-feed) This sensor detects a media jam in the media tray assembly by the media position and sensor on/off time. The sensor on/off states can be monitored by media passing through the sensor (pre-feed) sensing area. Front Switch (TTM media size) Media feed lift motor Sensor (media level) Sensor (media out) Media feed unit assemblySensor (pre-feed)
General information1-63 7500-XXX Main components Switch (2TM/TTM left door interlock) The left door interlock switch detects open/close of the left door assembly. Sensor (tray 3 feed-out) The sensor (tray 3 feed-out) detects media fed from the tray 3 or tray 4. Sensor (tray 4 feed-out) The sensor (tray 4 feed-out) detects media fed from the tray 4. 2TM/TTM media transport roll assembly The 2TM/TTM transport roll assembly feeds media from the tray 3 or tray 4 to the printer. 2TM/TTM controller card assembly The 2TM/TTM controller card assembly, which contains a CPU, controls media feed in the tandem tray module upon receiving a command from the printer engine card assembly and sensor/switch information. Sensor (tray 3 feed-out)Switch (2TM/TTM left door interlock) 2TM/TTM media transport roll ASM Sensor (tray 4 feed-out) Front
1-64MFP Service Manual 7500-XXX Switch (tandem tray media size) The following table gives on/off states of the switches on the switch (TTM media size), corresponding to the media sizes of the media tray assembly. Note: The switches (TTM media size) are denoted by “S/W1” and “S/W3” respectively from the left side. Media SizeAnalog switch S/W1 S/W3 No Tray Off Off B5L/7.25” x 10.5”L Off On 8.5” x 11”L On Off A4L On On
General information1-65 7500-XXX Duplex Duplex drive motor The rotating force of the drive motor is transmitted through the gears to components that need mechanical driving force as shown below. The transmitted driving force drives the two duplex media transport roll assemblies, and the (duplex media center transport roll assembly) through the gears. Duplex drive motor Duplex drive gear 33/74T Duplex drive gear 28T Duplex drive gear 33T Duplex drive gear 42T Duplex drive gear 33T Duplex drive gear 28T Duplex media transport roll asmDuplex media center transport roll asmDuplex drive gear 33/74T Duplex drive gear 28T Duplex media transport roll asm
1-66MFP Service Manual 7500-XXX Media transport Media transport path With the duplex installed, media is supplied from the MPF, tray 1 or tray 2, and is transported to the printer along the media transport path shown below. MPF MPF pick roll MPF Transport Roll ASM MPF ASMMedia feed unit ASMMedia feed unit ASM Pick roll Pick roll Separation roll Separation roll Feed roll Media transport roll ASM Registration roll ASM Transfer roll ASM PC cartridge Drum Heat roll Pressure roll Fuser unit ASM Exit 1 media exit roll ASM Duplex media transport roll ASM Duplex mediaCenter transport roll ASM Exit 2 media transport roll ASM Exit 2 media exit roll ASMTray 1Tray 2 Exit 1 Exit 2Feed roll
General information1-67 7500-XXX Layout of media transport path The main components associated with the media path and transport with the duplex installed. Functions of main components When the duplex is installed to the left of the printer, duplex (double-sided) printing is available with the printer. The following outlines the functions of the main components of the duplex. Switch (duplex left door interlock) The switch (left door interlock) detects open/close of the left door. Sensor (duplex wait) The sensor (duplex wait) detects whether media is remaining in the duplex. Duplex media transport roll ASM MPF MPF Transport pinch roll MPF Transport roll ASM Transport roll ASM Media transport pinch roll Separation rollFeed roll Duplex media center transport roll ASM Duplex media transport pinch roll Duplex media transport roll ASM MPF pick rollRegistration roll ASM Pick rollRegistration pinch roll Drum Transfer roll ASM Heat Roll Exit 1 media exit pinch rolls Exit 1 media exit roll ASM Exit 2 media transport roll ASM Exit 2 media exit pinch rolls Exit 2 media exit roll ASM Pressure roll Exit 2 Duplex TR AY 4 TR AY 3 (TTM) Tandem tray Tray 4 transport roll ASM
1-68MFP Service Manual 7500-XXX Duplex media transport roll assembly The two duplex media transport roll assemblies and the duplex media center transport roll assembly re-feeds the media printed on the front side through the duplex to print on the rear side. Duplex controller card assembly The duplex controller card assembly that contains a CPU controls media feed in the duplex upon receiving a command from the printer engine card assembly and sensor/switch information. Duplex drive motor The duplex drive motor transmits driving force to the two duplex media transport roll assemblies and the duplex media center transport roll assembly middle that feeds media. Sensor (duplex wait) Duplex media transport roll asmDuplex controller card asm Duplex drive motorDuplex media transport roll asm Duplex media center transport roll asm