Lexmark C 950 Service Manual
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Diagnostic aids 3-99 5058-030 Go Back Previous Next • A sheet of media of less than 11 inches is stacked in the stacker media bin with the Staple Mode changed. • An operator put a sheet (or sheets) when no media is remaining in the stacker media bin. (The size and condition of media stacked in the tray are not identified.) • Media was present in the stacker media bin when power was turned on. (The size and condition of media stacked in the tray are not identified.) • The finisher entered the Sleep Mode with mix stacking and then has exited the Sleep Mode. • The post-processing mode has changed. Functions of stacker media bin sensors/motors • Sensor (stacker bin level 1) – A light emitter and photo-receiver paired together to detect the height of media in the stacker media bin. – This sensor is used to control the elevator motor. – When blocked by media or the tray, this sensor turns high, deciding that the stacker media bin is above the reference level. – To the contrary, when receiving light, this sensor turns low, deciding that the stacker media bin is below the reference level. – The high to low turning point of the sensor is defined as the reference level. • Sensor (stacker bin level 2) – A light emitter and photo-receiver paired together to detect the height of media in the stacker media bin (same function as sensor (stacker bin level 1)). – This sensor is also used to control the elevator motor. – When blocked by media or the tray, this sensor turns high, deciding that the stacker media bin is above the reference level. – To the contrary, when receiving light, this sensor turns low, deciding that the stacker media bin is below the reference level. • Sensor (stacker bin no media) – A photo-interrupter sensor that detects that the stacker media bin is at the highest position; it also detects no media. – When the actuator attached to the carriage assembly right enters the sensing area, the emitted light is blocked, which turns the sensor to high (+5 V). • Sensor (stacker bin upper limit) – A photo-interrupter sensor that detects the stacker media bin’s abnormal elevation above the top position (sensor (stacker bin no media) position). – When the actuator attached to the carriage assembly right enters the sensing area, the emitted light is blocked, which turns the sensor to high (+5 V). • Sensor (stacker bin level encoder) – A photo-interrupter sensor that counts the pulse of the Encoder attached to the Shaft-Elevator. – The media volume in the stacker media bin is detected based on this count. • Stacker bin lift motor – A DC motor that elevates or lowers the stacker media bin. – Clockwise rotation elevates the tray, and counterclockwise rotation lowers the tray. • Media eject motor assembly – A stepper motor that ejects stapled or non-stapled media to the stacker media bin. – Clockwise rotation ejects media to the stacker media bin, and counterclockwise rotation reverses the eject roll to feed the media from the punch to the compiler unit assembly. Top view of finisher tray Rear staple Front staple
3-100 Service Manual 5058-030 Go Back Previous Next • Media eject clamp motor – A DC motor that elevates or lowers the media eject clamp when feeding media from the punch to the compiler unit assembly or from the compiler unit assembly to the stacker media bin. • Sensor (media eject clamp HP) – A photo-interrupter sensor that detects the set clamp home position. – This sensor functions as a trigger to control On/Off of the set clamp clutch. • Media eject clutch – When this clutch is activated, it transmits the media eject motor assembly rotating power to the media eject shaft assembly. Booklet tray Paper is folded into two by the booklet folding roll driven by the booklet Fold Roll Motor and booklet Eject Roll, and delivered to the booklet tray. Booklet tray is at a position lower than the paper delivery exit. Paper delivery belt will move at fixed interval for every set of output. When two sets or more are being delivered, one set at a time is being delivered. Sensor (stacker bin level 1) Sensor (stacker bin level 2) Media eject clutch Sensor (stacker bin upper limit) Sensor (stacker bin no media)Stacker bin lift motor assemblySensor (stacker bin level encoder)Sensor (media eject shaft HP)Media eject motor assembly Sensor (media eject clamp HP) Eject clamp motor
Diagnostic aids 3-101 5058-030 Go Back Previous Next When the front of the booklet tray is facing down, the printout will fall automatically below the tray. When removing paper, press booklet tray belt switch to move the paper delivery belt to the position for paper removal. Power supply and interlock The finisher is equipped with the following interlock switches. • Switch (finisher front door interlock)—Turns off when the cover assembly front opens, shutting off the Interlock +24 V dc line in the finisher. Booklet bin drive motor Sensor (booklet bin media present)
3-102 Service Manual 5058-030 Go Back Previous Next • Switch (eject cover interlock)—Turns off when the cover eject on the right side opens, shutting off the Interlock +24 V dc line in the finisher. Switch (eject cover interlock) Switch (finisher front door interlock) AC PrinterFinisher LVPS card asm +24Vdc ON/OFFFinisher controller card asm +5Vdc +24Vdc Interlock +24Vdc Sensor Switch (eject cover interlock)Switch (finisher front door interlock)
Diagnostic aids 3-103 5058-030 Go Back Previous Next TTM theory of operations
3-104 Service Manual 5058-030 Go Back Previous Next Media transport Media transport path Media is supplied from tray 2, tray 3 or tray 4, and is transported to the printer along the media transport path. The following is a cross section of the printer and the TTM, showing the main components directly associated with the media path and transport. Functions of main components When the TTM is installed under the printer, additional trays are available. Media tray assembly It is necessary to adjust the rear side guides 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 TRAY1 Duplex media transport roll assembly MPF transport roll MPF feed roll MPF pick roll MPF separation roll Feed roll Separation roll Pick roll Tray1transport roll assembly Registration roll assembly 2nd transfer roll assembly Fuser Redrive roll Tray module transport roll assembly Tray 4 transport roll assembly Feed roll Pick roll Feed roll Pick roll Separation roll Feed roll Separation roll Pick roll TRAY 2 TRAY2 TRAY 3 TRAY3TRAY 4 TRAY4
Diagnostic aids 3-105 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. 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 2 media tray assembly Rear media guide Bottom plate End guide
3-106 Service Manual 5058-030 Go Back Previous Next Tray 3 or 4 media tray assembly TTM media feed units 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 (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. Rear lift cables Rear media guide Bottom plate F/R lift cable F/L lift cable
Diagnostic aids 3-107 5058-030 Go Back Previous Next 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. 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. Front Switch (TTM media size) Media feed lift motor Sensor (media level) Sensor (media out) Media feed unit assembly
3-108 Service Manual 5058-030 Go Back Previous Next 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. 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. TTM tray 4 media transport motor This motor is used in the TTM to transport media from the tray 4 towards the tray module left door assembly. TTM controller card assembly The TTM 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. Switch TTM (media size) Switch (tray module interlock) TTM controller card assembly Tray module drive motor TTM tray 4 media transport drive motor Front Sensor (tray 2 feed-out) Sensor (tray 3 feed-out) Sensor (tray 4 feed-out) Switch (media size)