Lexmark X 850 Owners Manual
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General information1-49 7500-XXX Sensor (ADF pre-registration) ADF feed motor assembly Sensor (sheet through) ADF registration motor Sensor (ADF registration) Sensor (ADF inverter) Sensor (ADF APS 1)Sensor (ADF APS 2)Sensor (ADF APS 3)Inverter solenoid assembly
1-50MFP Service Manual 7500-XXX Control Document size detection at scanner unit assembly The width (fast-scan-directional size) of the document sheet on the Platen Grass is detected with the CCD image sensor, and the length (slow-scanning-directional size) is detected with the sensor (platen length APS 1) and the sensor (platen length APS 2). Document size detection timing The size of the document sheet on the platen glass is detected at the following timings: •When the Platen Cover (ADF) is closed •When the START button is pressed with the Platen Cover (ADF) open Identification of standard document sizes The width of the document sheet is detected in millimeters with the CCD image sensor to determine the size in the fast scanning direction. With respect to a pair of documents whose sizes in the fast scanning direction are the same, the document size is determined by detecting paper presence/absence at the positions of sensor (platen length APS 1) and sensor (platen length APS 2) (e.g., A4LEF vs. A3SEF; 8.5x11SEF vs. 8.5x13SEF). The standard document sizes to be identified by the same given detection information are defined on an area-by-area basis. Each area is to be set in the system data. The figure below shows the positional relationships among the scan position of the CCD image sensor and the positions of sensor (platen length APS 1) and the sensor (platen length APS 2). CCD scan position Sensor (platen length APS 1) Sensor (platen length APS 2)
General information1-51 7500-XXX Shown below are the combinations of document size, detection range in the fast scanning direction, and sensors. Document SizeWidth (Fast scanning direction: mm)Length (Slow scanning direction) Area Fast scanning WidthDetection RangeSensor (platen length APS 1)Sensor (platen length APS 2)012 Japanese Post Card SEF100.0 90–115 Off Off X X N Post Card SEF 101.6 N O X A6 SEF 105.0 O N O 5 X 7 SEF 127.0 115–138 Off Off N O N B6 SEF 128.0 O N O 5.5 X 8.5 SEF 139.7 138–163 Off Off X O X A5 SEF 148.0 O X O Japanese Post Card LEF148.0 X X N Post Card LEF 152.4 N N X B5 SEF 182.0 163–188 On Off O X O 16kai SEF 194.0/ 195.0188–202 On/Off Off X X X*3 A5 LEF 210.0 202–213 Off Off O X*3O A4 SEF 210.0 On On/Off O X *3O 5.5 X 8.5 LEF 215.9 213–226 Off Off O *1OX*3 8.5 X 11 SEF 215.9 On Off O*1OX*3 8.5 X 12.4 SEF 215.9 On On N N X 8.5 X 13 SEF 215.9 O N X 8.5X 14 SEF 215.9 N O X 8 X 10 LEF 254.0 226–262 Off Off N X *4X B5 LEF 257.0 O *2XO B4 SEF 257.0 On On O X O Executive LEF 266.7 262–267 Off Off X O *4X 8 X 10.5 LEF 266.7 X *2NX 16kai LEF 267.0/ 270.0267–275 Off Off X X X *3 8kai SEF On On/Off X X X*3 8.5 X 11 LEF 279.4 275–289 Off Off O*2OX*5 11 X 14.9 SEF 279.4 On On N N X 11 X 17 SEF 279.4 O O X *5
1-52MFP Service Manual 7500-XXX O: Detectable by default. N: Detectable by replacing the document size marked as O with the system data having the same detection information. X: Not detectable. *1: Changeable from 5.5 X 8.5 LEF to A5 LEF, or from 8.5 X 11 SEF to A4 SEF by the system data. *2: Changeable from B5 LEF or 8.5 X 11 LEF to 8 X 10.5 LEF by the system data. *3: Detectable by setting the system data. *4: Changeable from Executive LEF to 8 X10 LEF. *5: Changeable from A4 LEF to 8.5 X 11 LEF, or from A3 SEF to 11 X 17 SEF. ADF document size detection The ADF first detects the document size when the document is set on the document tray, and detects the document size again when the document travels. When the document is set on the document tray, the document size is determined by a combination of ON/off status of the sensor (ADF APS 1), sensor (ADF APS 2) and the sensor (ADF APS 3) for detecting the document width (in the fast scanning direction) and ON/off status of the sensor (document tray length 1) and the sensor (document tray length 2) for detecting the document length (in the slow scanning direction). The document width is detected according to whether the sensor (document tray width 1), sensor (document tray width 2) and the sensor (document tray width 3) are shielded (blocked) or unshielded (unblocked) by the document tray size actuator moving in conjunction with guides of the document tray. The document length is detected according to whether the sensor (document tray length 1) and the sensor (document tray length 2) are shielded (blocked) or unshielded (unblocked) by the document set on the tray. When different-sized sheets are stacked on the tray, the document size is determined by using the largest possible combination of width and length obtained from the sheets. A4 LEF 297.2 289–307 Off Off O O O *5 A3 SEF 297.2 On On O O O*5 Document SizeWidth (Fast scanning direction: mm)Length (Slow scanning direction) Area Fast scanning WidthDetection RangeSensor (platen length APS 1)Sensor (platen length APS 2)012
General information1-53 7500-XXX The standard document sizes to be identified by the same given detection information are defined on an area-by-area basis. Each area is to be set in the system data. Sensor (document tray width 2) Sensor (document tray width 3)Sensor (document tray width 1) Document tray media size actuator
1-54MFP Service Manual 7500-XXX The table below shows the combinations of document sizes and sensors. O: Detectable X: Not Detectable While the document is traveling, document size detection is performed as follows. When the document goes through the sensor (ADF APS 1), sensor (ADF APS 2) and the sensor (ADF APS 3), the document width in the fast scanning direction is detected according to the combination of shielded/ unshielded status of each sensor. The document length in the slow scanning direction is detected by the scanning time measured from the moment when the document starts scanning from the wait position (see Pre-registration) until its tail end passes through the sensor (ADF sheet through). Document SizeWidth (Fast scanning direction) Sensor (document tray width *)Length (Slow scanning direction) Sensor (document tray length *)Area 123 1 2 012 5.5 X 8.5 SEF Off Off Off On Off X O X A5 SEFOXO B5 SEF Off Off Off On Off X X O 8 X 10 SEFXOX 8 X 10.5 SEFOX X A5 LEF Off On Off Off Off O O O A4 SEF On Off O O O 5.5 X 8.5 LEF Off On On Off Off O O O 8.5 X 11 SEF On Off O O O 8.5 X 13 SEF On On O X X 8.5 X 14 SEFXOO 8 X 10 LEF On Off On On Off O O O B5 LEF Off Off O O O B4 SEF On On O O O 8 X 10.5 LEF On Off Off On Off O O X Executive LEF Off Off O O X 16kai LEFXXO 8kai SEF On On O O O 8.5 X 11 LEF On On Off On Off O O O 11 X 17 SEF On On O O O A4 LEF On On On On Off OOO A3 SEF On On O O O
General information1-55 7500-XXX Document scanning steps The CCD image sensor is used to read image data from the document. To stabilize the read image data, the CCD image sensor output is adjusted and the read image data is compensated. The CCD image sensor output is adjusted with the gain/offset voltage of the amplifier in the analog circuit. This adjustment includes AGC and AOC. In addition, the reference data is collected and compensation values are calculated to compensate for the read image data. This compensation includes shading compensation, white variation compensation, and black variation compensation. These adjustment and compensation steps are detailed below. The reference data is prepared by reading the image data of a white reference plate via the CCD image sensor. AGC (auto gain control): white level coarse adjustment AGC is a function that adjusts the gain so that the CCD image sensor output becomes as specified when the exposure lamp is on. AGC functions as a coarse white level adjustment of the image. AGC is performed at initialization. AOC (auto offset control) AOC is a function that adjusts the offset voltage so that the CCD image sensor output becomes as specified when the exposure lamp is off. AOC functions as a black level adjustment of the image. AOC is performed at initialization. Shading compensation Shading compensation is a function that compensates for pixel-to-pixel sensitivity variation of the CCD image sensor and pixel-to-pixel output variation of the CCD image sensor that is caused by illumination non uniformity in the fast scanning direction of the optical system. Shading compensation is performed at initialization. White level variation compensation White level variation compensation is performed to compensate for variation in light quantity of the exposure lamp. White level variation compensation includes two processes: acquisition of white variation compensation reference data during initialization and white variation compensation during document scanning. For the ADF, white level variation compensation is performed at both the white reference plate position of the platen and at the white reference plate of the scanner read position. Black level variation compensation Black level variation compensation is performed to compensate for variation in black level that is caused by the temperature drift of the CCD image sensor and analog circuit. Black level variation compensation is performed during document scanning. For the platen, black level variation compensation is performed at the white reference plate position of the platen. For the ADF, black level variation compensation is performed at the scanner read position.
General information1-57 7500-XXX Driving force transmission path 2 tray / tandem tray drive motor assembly The rotating force of the 2 tray / tandem tray motor is transmitted through the gears to components that require mechanical driving force as shown below. The driving force transmitted to the gear 22/40T drives the transport roll assembly through the clutch and gears. TTM drive gear (60T) TTM drive gear (37T) TTM drive gear (32T) TTM drive gear (37T) 2TM/TTM media transport roll ASMTTM drive gear bracket ASM TTM tray 4 media transport roll ASM 2TM/TTM drive motor TTM drive gear (22/40) 2TM/TTM clutch TTM drive gear (38T) TTM drive gear (60T) TTM drive gear (60T)
1-58MFP Service Manual 7500-XXX 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 shown below. Pick roll Pick roll Separation roll Separation roll Feed roll 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 3Tray 4 Upper pinch rollFeed roll Upper pinch roll Lower pinch roll 2TM/TTM media Transport roll ASM 2TM/TTM media Transport roll ASM Media transport roll ASM Registration roll ASM Exit 1 Exit 2