Lexmark X 850 Owners Manual
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General information1-39 7500-XXX Duplex document The ADF scans the image on Side 1 (side facing up when set on the tray), inverts the document sheet, scans the image on Side 2 (side facing down when set on the tray), and then ejects the document sheet while inverting it. Therefore, the duplex document sheet is ejected with Side 2 up as with the simplex document sheet. For two simplex documents, feed is performed in the following sequence. 1.The first document sheet (Side 1) is fed to the ADF transport roll assembly. (see Pre-feed) 2.The document sheet (Side 1) is fed to the ADF registration roll assembly and then fed to the scan feed reference position. (see Pre-registration) 3.The document sheet (Side 1) is fed at the feed speed corresponding to the selected magnification, and the image is scanned with the exposure lamp at the scan position. (see Scan control) 4.As the image is scanned, the document (Side 1) is fed by the ADF feed-out roll assembly and ADF exit roll assembly that are driven by the ADF registration motor rotating in the reverse direction (CCW direction). When the trail edge of the document has passed through the sensor (inverter), the ADF registration motor changes its rotational direction to the normal direction (CW direction) to drive the ADF exit roll assembly in the opposite direction. Thus, the document sheet is inverted and fed to the ADF transport roll assembly again. 5.When the sensor (ADF pre-registration) detects the lead edge of the document sheet (Side 2), the inverter solenoid assembly is turned on to release the nipped ADF exit roll assembly and exit pinch roll. If these rolls are not released, the lead edge of the document sheet (Side 2) reaches the ADF exit roll assembly before the trail edge of the document sheet (Side 2) leaves the ADF exit roll assembly when the document sheet (Side 2) is long in the slow scanning direction. 6.The document sheet (Side 2) is fed to the ADF registration roll assembly and then fed to the scan feed reference position. (see Pre-registration) 7.The document sheet (Side 2) is fed at the feed speed corresponding to the selected magnification, and the image on it is scanned with the exposure lamp at the scan position. (see Scan control) 8.When the trail edge of the document sheet (Side 2) passes through the sensor (ADF pre-registration), the inverter solenoid assembly is turned off to nip the ADF exit roll assembly and exit pinch roll. 9.As the image is scanned, the document sheet (Side 2) is fed by the ADF feed-out roll assembly and ADF exit roll assembly that are driven by the ADF registration motor turning in the reverse direction (CCW direction). When the trail edge of the document sheet (Side 2) has passed through the sensor (inverter), the ADF registration motor changes its rotational direction to the normal direction (CW direction) to drive the ADF exit roll assembly in the opposite direction. Thus, the document sheet (Side 2) is inverted and fed toward the ADF transport roll assembly again. 10.At the same time, the ADF feed motor assembly rotates in the normal direction (CW direction) to drive the ADF transport roll assembly, thus feeding the document sheet (Side 1) toward the exit. Sensor (ADF pre-registration) 2nd documant 1st document
1-40MFP Service Manual 7500-XXX 11.When the sensor (ADF pre-registration) detects the lead edge of document sheet (Side 1), the inverter solenoid assembly is turned on to release the nipped ADF exit roll assembly and exit pinch roll and the ADF registration motor decelerates and stops. 12.After the predetermined time, the ADF registration motor starts rotating in the reverse direction (CCW direction) to drive the ADF registration roll assembly and ADF feed-out roll assembly in the exit direction in order to feed the document sheet (Side 1). 13.When the trail edge of the document sheet (Side 1) passes the sensor (ADF pre-registration), the inverter solenoid assembly is turned off to nip the ADF exit roll assembly and exit pinch roll, thereby ejecting the document sheet with the ADF exit roll assembly. 14.At this timing, the feed of the second document sheet starts. 15.The subsequent steps are the same as those for the first document sheet. 2nd document 1st document (side 2:scan) 1st document (side 2:scan) 2nd document 2nd document 1st document (side1:no scan) 2nd document 1st document (side1:no scan) 1st document (side1:no scan) 2nd document Sensor (ADF pre-registration)
General information1-41 7500-XXX Image data flow The image date from the document set on the scanner unit assembly or ADF goes through the following components before it is printed at the Engine section. Lens CCD image sensor Scanner controller card assembly Scanner Engine RIP card assembly Printhead assembly PC cartridge assembly (drum)Document
1-42MFP Service Manual 7500-XXX Drive torque transfer scheme ADF feed motor assembly The rotational force of the ADF feed motor assembly is transferred to each document feeding roll as shown below. ADF feed motor assembly ADF drive belt Feed drive rear pulley 14/32/37 Transport roll drive beltFeed/pick drive gear 20T Transport roll drive gear/pulley 20/50TFeed/pick drive shaft assembly Transport roll drive gear 20TFeed roll drive gear 26T Transport roll assembly Feed roll Pick roll idler gear 36T Pick roll drive gear 34T Pick roll
General information1-43 7500-XXX ADF registration motor The rotational force of the ADF registration motor is transferred to each document feeding roll as shown below. Gear layout ADF registration motor Registration roll drive belt Registration drive gear/pulley 21/54T Registration drive belt Exit/feed-out drive pulley 25/28Registration roll drive gear 28T Exit roll drive belt Feed-out roll assemblyRegistration roll assembly Exit roll drive pulley 20T Exit roll assembly
1-44MFP Service Manual 7500-XXX Feed roll Exit roll assembly Pick rollPick roll drive gear 34TExit roll drive pulley 20T Pick roll idler gear 36T Feed roll drive gear 26T ADF feed motor assembly Feed/pick drive gear 20T Feed drive gear/pulley14/32/37T Transport roll drive gear pulley 20/50T ADF registration motor Registration main drive pulley 21/54T Transport roll drive gear 20T Registration roll drive pulley 28T Exit/feed-out drive pulley 25/28 Transport roll assembly Registration roll assembly Feed-out roll assembly
General information1-45 7500-XXX Names and functions of components The sections below describe the functions of main components of the scanner. Scanner unit assembly Sensor (platen length APS 1) Sensor (platen length APS 2) The document length in the slow scanning direction is detected by a combination of the two reflector sensors. Switch (platen interlock) A switch that detects whether the ADF is open and determines the timing of platen document size detection. Sensor (ADF angle) A sensor that detects the angle at which the ADF opens and determines the timing of platen document size detection. Scanner drive motor assembly A stepping motor that drives the full rate carriage and the half rate carriage. Sensor (scanner HP) A sensor that detects the HP position of the full rate carriage. The rear portion of the full rate carriage frame functions as an actuator that shields the senor (scanner HP) for detection. Scanner exposure lamp A xenon lamp to which the document is exposed. Exposure lamp PS card assembly A card that switches on/off the exposure lamp according to the signal from the scanner controller card assembly. Lens assembly A kit that consists of a lens used to read the document and a CCD image sensor used to photoelectrically convert the image data read from the document. Scanner controller card assembly A card that controls the scanner section.
1-46MFP Service Manual 7500-XXX Scanner cooling fan A fan that prevents overheating of the scanner controller card assembly and exposure lamp. ADF Sensor (ADF tray length 1) Sensor (ADF tray length 2) The document length in the slow scanning direction is detected by a combination of these two sensors. Sensor (document tray width 1) Sensor (document tray width 2) Sensor (document tray width 3) The document length in the fast scanning direction is detected by the combination of these three sensors detecting the position of the tray on which the document is set. Sensor (ADF document set) A sensor that detects the presence or absence of a document on the ADF document tray. (Presence: Beam is unshielded (unblocked). Absence: Beam is shielded (blocked).) Pick roll position motor assembly A stepping motor that moves the pick roll vertically. Lens Sensor (platen length APS2) Sensor (platen length APS1) Scanner drive motor assembly Exposure lamp PS card assembly (under the carriage) Scanner cooling fan ADF angle actuator assembly Sensor (ADF angle) Sensor (scanner HP) Scanner controller card assembly Exposure lamp Switch (platen interlock)CCD image sensor
General information1-47 7500-XXX Sensor (pick roll position HP) A sensor that detects the home position of the pick roll. ADF Document Set LED An LED that illuminates when a document is set on the ADF Document Tray. Switch (ADF left cover interlock) A switch that detects whether the ADF left cover assembly is open. ADF controller card assembly A card that controls the ADF unit assembly. The ADF controller card assembly is connected to and controlled by the Scanner controller card assembly. Sensor (ADF APS 1) Sensor (ADF APS 2) Sensor (ADF APS 3) These are sensors that detect the fast-scanning-directional width of the moving document. Sensor (ADF sheet through) The ADF sensor (ADF sheet through) is installed immediately downstream from the Feed roll to detect completion of document feed. (document is present: shielded (blocked); document is absent: unshielded (unblocked)) Sensor (document tray width 2) Sensor (document tray length 2) Sensor (document tray length 1) Sensor (document tray width 1) ADF controller card assembly Sensor (document set) Pick roll position motor assembly Sensor (pick roll position HP) Switch (left cover interlock) Document set LED Sensor (document tray width 3)
1-48MFP Service Manual 7500-XXX Sensor (ADF pre-registration) The ADF sensor (ADF pre-registration) is installed immediately upstream from the ADF transport roll assembly to detect that the preceding document sheet has left the ADF transport roll assembly, triggering the pre-feed of the next document sheet. Sensor (ADF registration) The sensor (ADF registration) is installed upstream from the ADF registration roll assembly to detect that the preceding document sheet has left the ADF registration roll assembly, triggering the pre-registration of the next document sheet. Sensor (ADF inverter) The sensor (ADF inverter) is installed immediately downstream from the ADF feed-out roll assembly to detect the ejection of a document sheet. ADF feed motor assembly The feed motor assembly is a stepping motor that rotates the pick roll and feed roll in the reverse direction (CCW direction) and rotates the ADF transport roll assembly in the normal direction (CW direction). When this motor rotates in the reverse direction, the ADF transport roll assembly stops. ADF registration motor The registration motor is a stepping motor that rotates the ADF registration roll assembly, ADF feed-out roll assembly, and ADF exit roll assembly in the reverse direction (CCW direction) and rotates the ADF exit roll assembly in the normal direction (CW direction). When this motor rotates in the normal direction, the ADF registration roll assembly and ADF feed-out roll assembly run idle. Inverter solenoid assembly This solenoid nips or releases the ADF exit roll assembly and exit pinch roll. Normally, the ADF exit roll assembly and exit pinch roll are nipped. On: Released Off: Nipped