Lexmark C 950 Service Manual
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Diagnostic aids 3-119 5058-030 Go Back Previous Next 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. 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.
3-120 Service Manual 5058-030 Go Back Previous Next Sensor (tray 2 feed-out) The sensor (tray 2 feed-out) detects media fed from the tray 2. Tray module media transport roll assembly The tray module transport roll assembly feeds media from the tray 2. Tray module drive motor This motor is used to drive the media transport mechanism in the tray module. 1TM controller card assembly The 1TM controller card assembly, which contains a CPU, controls media feed in the 1TM upon receiving a command from the upper printer engine card assembly and sensor/switch information.
Diagnostic aids 3-121 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
3-122 Service Manual 5058-030 Go Back Previous Next High capacity feeder theory of operations Media feeding Outline The HCF feeds media from the tray to the printer through the HCF media feed unit assembly and the HCF media transport roll assembly. HCF media feed unit assembly The pick roll feeds media from the tray. The feed roll and the separation roll feed media from the pick roll to the HCF media transport roll assembly. Rollers are driven by the media feed lift motor on the media feed unit assembly at prescribed timings. The media fed by the feed roll and separation roll passes through the sensor (pre-feed). The sensor (pre-feed) detects the presence of media fed from the tray. The sensor (pre-feed) controls the HCF media feed lift motor speed and on/off operation of the HCF pick solenoid assembly. HCF media transport roll assembly This HCF media transport assembly roll transfers media fed from the HCF media feed unit assembly to the printer. The HCF media transport roll assembly is driven by the transport motor installed on the rear side. The media fed with the HCF media transport roll assembly passes through the sensor (tray 5 feed-out).
Diagnostic aids 3-123 5058-030 Go Back Previous Next The sensor (tray 5 feed-out) detects the presence of media fed from the tray and controls the media feed lift motor stop and the transport motor speed. It also detects media jams to identify the media jam zone. HCF media feed unit assembly operation Upon receiving the feed start signal from the controller, the HCF activates the pick solenoid after a preset time has passed to press the pick roll against the media in the tray. After a preset time has passed, after receiving the feed start signal, the HCF feed lift motor rotates forward to feed media from the tray to the feed roll side with the pick roll. When the end of the media reaches the sensor (pre-feed) and the sensor turns on, the pick solenoid is deactivated so that the pick roll separates from the media in the tray. The pick solenoid remains activated at a high voltage for a specified time from its actuation. After that, it is activated at a low voltage until it is deactivated. If the HCF receives the feed start signal for the next media while FrontHCF feed lift motor HCF transport motor Pick rollFeed rollSeparation roll HCF media transport roll assembly Sensor (tray 5 feed-out) Sensor (pre-feed)
3-124 Service Manual 5058-030 Go Back Previous Next the solenoid is activated at low-voltage, it maintains the actuation state at the low voltage, while pressing the pick roll against the media in the tray. When the media is transferred to the printer and the sensor (tray 5 feed-out) turns on, the pick solenoid is reactivated for a preset time. Media feed lift motor start/stop timing and revolutions are controlled based on the timing of the HCF feed lift motor start signal and the sensor (pre-feed). Thus, media is fed from the tray to the HCF media transport roll assembly. Pick rollFeed rollHCF feed lift motor HCF pick solenoid Sensor (tray 5 feed-out) Media
Diagnostic aids 3-125 5058-030 Go Back Previous Next HCF media transport roll assembly operation Upon receiving the feed start signal from the controller the HCF activates the HCF transport motor at a high speed after a preset time has passed. This rotating power of the HCF transport motor is transmitted to the HCF media transport roll assembly, and the media from the HCF media feed unit assembly is transferred to the printer. When the sensor (tray 5 feed-out) is turned on by the media fed with the HCF media transport roll assembly, the HCF transport motor speed decreases after a preset time has passed. When the sensor (registration) in the printer is turned on by the media fed from the HCF, the HCF transport motor turns off. When the next feed start signal is received, before the HCF transport motor is turned off, the transport motor continues to rotate. Thus, media is transferred from the HCF media transport roll assembly to the laser printer. HCF media feed unit assembly sensor/motor functions Functions of the sensors and motors of the media feed unit assembly are outlined below. •HCF media feed lift motor—is a stepping motor that rotates (forward) the pick roll and feed roll to send media from the tray to the HCF media transport roll assembly. The motor also lifts the tray by reverse rotation. •HCF pick solenoid—Raises or lowers the pick roll. The HCF pick solenoid stays activated from the beginning of media feed until the sensor (pre-feed) turns on. The HCF pick solenoid is activated when the tray is inserted and when the power is turned on to check the presence of media in the tray. •Sensor (pre-feed)—Detects whether media has been fed from the tray, and controls the HCF feed lift motor speed. The sensor also becomes a trigger to deactivate the HCF pick solenoid. The sensor turns on upon detecting media, and determines that media is present. •HCF transport motor—is a stepping motor that rotates the HCF media transport roll assembly to feed media to the printer. •Sensor (tray 5 feed-out)—Detects whether media has been fed from the tray, becomes a trigger to stop the HCF feed lift motor, and controls the HCF transport motor speed. Media HCF media transport roll assemblySensor (tray 5 feed-out)HCF transport motor
3-126 Service Manual 5058-030 Go Back Previous Next The sensor turns on (light receiving) upon detecting media, and determines that media is present. Status monitoring This function includes detection of static media jams, interlocking, and insertion of the HCF media tray assembly. Static media jam detection This function checks the status of all relevant sensors on the media path to detect media jams. When media is present on the sensor, it is treated as a static jam. This detection of media jam is carried out during the start-up procedure and at every jam/fail detection. The status of all relevant sensors are checked during the start-up procedure. In addition, the sensor states are checked constantly for the jam/fail detection in order to monitor the variation in sensor levels. Interlock detection This function checks the open state of the switch (top door interlock) and the switch (HCF unit docking interlock). This detection is constant while the power is on. Sensor (pre-feed) HCF pick solenoid HCF feed lift motor HCF transport motor Sensor (tray 5 feed-out) FrontSensor (media out)Sensor (media level)
Diagnostic aids 3-127 5058-030 Go Back Previous Next When open, the switch (top door interlock) is detected, printing operation is inhibited, and the 24 V supply to the media feed lift motor and the transport motor is shut off. When open, the switch (HCF unit docking interlock) is detected, and transfer of media from the HCF is inhibited. Tray insertion detection The sensor (HCF media tray set) checks whether the tray is properly set. This check is constant while the power is on. Printing operation is inhibited if the sensor (HCF media tray set) off (tray is not present) is detected before printing starts. Functions of sensors used for status monitoring •Switch (HCF top door interlock)—Detects open/close of the HCF top door. The on state of this switch indicates the top door is closed. •Switch (HCF unit docking interlock)—Detects the docking of the HCF with the printer. The off state of this switch indicates that the HCF is separated from the printer. In this case, transfer of media is inhibited. •Sensor (HCF media tray set)—Detects insertion of the HCF media tray into the HCF. The sensor turns on when the HCF media tray is properly inserted. While it is off, media fed from the HCF medial tray is inhibited. Switch (HCF top door interlock) Switch (HCF unit docking interlock) Sensor (HCF media tray set) HCF media tray
3-128 Service Manual 5058-030 Go Back Previous Next Media size detection When media is loaded in the tray, the media size is automatically detected by the rear media edge guide that is attached to the media tray assembly and aligned with the side of the media. The position of the rear media edge guide is detected by the sensor (HCF media size L) and the sensor (HCF media size R). Note: B5L and 7.25” x 10.5” L can be switched by the NVM. The media size is detected during the start-up procedure and —with the tray inserted—once a specified amount of time has passed since the sensor (HCF tray set) level was change from off to on. The media size loaded in the tray is determined when the same media size has been detected a certain number of consecutive times. If a sensor level pattern does not match the above table, media size cannot be determined. In this case, though the tray is lifted, starting a print job by feeding media from the tray is inhibited. Sensor for media size detection Size sensors There are two size sensors: sensor (HCF media size R) and sensor (HCF media size L). Media size can be determined by moving the HCF rear media edge guide to turn on/off these sensors and by using the sensor level patterns.Media size Sensor (HCF media size R) Sensor (HCF media size L) B5L off off 7.25” x 10.5” L 8.5” x 11” L on off A4L off on HCF rear media guide Sensor (HCF media size R)Sensor (HCF media size L)