Lexmark C 950 Service Manual
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Diagnostic aids 3-109 5058-030 Go Back Previous Next Switch (TTM 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/W1S/W3 No TrayOffOff B5L/7.25” x 10.5”LOffOn 8.5” x 11”LOnOff A4LOnOn
3-110 Service Manual 5058-030 Go Back Previous Next 3TM theory of operations
Diagnostic aids 3-111 5058-030 Go Back Previous Next Media transport Media transport path Media is supplied from tray 3 or tray 4, and is transported to the printer along the media transport path. Media transport path The following is a cross section of the printer and the 3TM, showing the main components directly associated with the media path and transport. Functions of main components When the 3TM is installed under the printer, additional trays are available. Media tray assembly Media feed unit assembly It is necessary to adjust the guide and the end guide in the media tray assembly to match the media size. Rear media guide The rear media guide can be adjusted to different media sizes by moving it to the front or rear. The guide comes into contact with the rear edge of the media and holds it in position. TRAY 1 TRAY 2 TRAY 3 TRAY 4 Duplex media transport roll assembly MPF transport roll MPF feed roll MPF pick roll MPF separation roll Tray module transport roll assembly Separation roll Feed rollFeed roll Feed rollFeed roll Separation rollSeparation roll Separation roll Pick roll Pick roll Pick roll Pick roll Tray1transport roll assembly Registration roll assembly 2nd transfer roll assembly fuser Redrive roll
3-112 Service Manual 5058-030 Go Back Previous Next Bottom plate The force pushing up the bottom plate is transmitted by the driving force of the motor on the media feed unit assembly. The bottom plate is pushed up by the rotation of the lift up shaft, which causes the supplied media to come in contact with the pick roll. Tray 2, 3, 4 media tray assembly 3TM media feed units Media feed unit assembly Since the tray 2, tray 3, and tray 4 are functionally equivalent in terms of the switch (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 (media size) The switch (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. Rear media guide Bottom plate End guide
Diagnostic aids 3-113 5058-030 Go Back Previous Next 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. Main components Switch (tray module left door interlock) The switch (tray module left door interlock) detects open/close of the tray module left door assembly. Sensor (tray 2 feed-out) The sensor (tray 2 feed-out) detects media fed from trays 2, 3, or 4. Sensor (tray 3 feed-out) The sensor (tray 3 feed-out) detects media fed from the tray 3 or tray 4.
3-114 Service Manual 5058-030 Go Back Previous Next Sensor (tray 4 feed-out) The sensor (tray 4 feed-out) detects media fed from the tray 4. Tray module media transport roll assembly The tray module transport roll assembly feeds media from the tray 3 or tray 4 to the printer. Tray module drive motor This motor is used to drive the media transport mechanism in the tray module. 3TM controller card assembly The 3TM controller card assembly, which contains a CPU, controls media feed in the tandem tray module upon receiving a command from the upper printer engine card assembly and sensor/switch information.
Diagnostic aids 3-115 5058-030 Go Back Previous Next Switch (media size) The following table gives on/off states of the switches on the switch (media size), corresponding to the media sizes of the media tray assembly. Note: The switches (media size) are denoted by “S/W1” and “S/W3” respectively from the left side. Media SizeAnalog switch S/W1S/W3 No TrayOffOff B5L/7.25” x 10.5”LOffOn 8.5” x 11”LOnOff A4LOnOn
3-116 Service Manual 5058-030 Go Back Previous Next 1TM theory of operations
Diagnostic aids 3-117 5058-030 Go Back Previous Next Media transport Media transport path Media is supplied from tray 3 or tray 4, and is transported to the printer along the media transport path. Media transport path The following is a cross section of the printer and the 1TM, showing the main components directly associated with the media path and transport. Functions of main components When the 1TM is installed under the printer, additional trays are available. Media tray assembly It is necessary to adjust the rear and the end guide in the media tray assembly to match the media size. Rear media guide The rear media guide can be adjusted to different media sizes by moving it to the front or rear. The guide comes into contact with the rear edge of the media and holds it in position. Bottom plate The force pushing up the bottom plate is transmitted by the driving force of the motor on the media feed unit assembly. The bottom plate is pushed up by the rotation of the lift up shaft, which causes the supplied media to come in contact with the pick roll. TRAY 1 Duplex media transport roll assembly MPF transport roll MPF feed roll MPF pick roll MPF separation roll Feed rollFeed roll Separation roll Pick roll Tray1transport roll assembly Registration roll assembly 2nd transfer roll assembly Fuser Redrive roll TRAY 1Tray module transport roll assembly Feed roll Separation roll Pick roll
3-118 Service Manual 5058-030 Go Back Previous Next Tray 2 media tray assembly 1TM media feed units Media feed unit assembly 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. Rear media guide Bottom plate End guide