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Olivetti d-Color MF550, Theory Of Operation

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14. Transfer Corona section

Theory of Operation Ver. 8.0 Jun. 2008

8

6

Composition/Operation

14.3.10

Pressure/retraction control during ACS mode

• For monochrome printing in the ACS mode, the pressure/retraction operation of the 1st

image transfer roller is controlled according to the number of monochrome originals that
continue during multiple copies. It promotes high productivity and extends consumables
life.

* ACS: Auto color selection

A. Operation

• ACS control starts counting the number of multi-copies of the monochrome original when

switched from the color original to the monochrome original.

• When the number of multi-copies is as specified or under.

: The monochrome printing will start with color mode. (with the 1st image transfer roller /

Y/M/C being pressed)
The transfer belt being pressed saves time since the 1st image transfer roller does not
need to be retracted.

• When the number of multi-copies is as specified or over.

: The monochrome printing will start when the color mode is complete and the 1st image

transfer roller /Y/M/C is retracted to be switched to the monochrome mode.
The transfer belt being retracted prevents IU to be wasted by useless rotation.

• Number of multiple copies of monochrome originals when the paper feed speed is 216

mm/s (Plain paper).

• Number of multiple copies of monochrome originals when the paper feed speed is 132

mm/s, or 108 mm/s (Thick stock 1, Thick stock 1+, Thick stock 2, Thick stock 3, Thick
stock 4, Special paper).

Paper length in the sub

scanning direction

monochrome printing in color mode

Monochrome printing after switched

to monochrome mode

216 mm or less

4 sheets or less

5 sheets or more

Over 216 mm and up to

297 mm

3 sheets or less

4 sheets or more

Over 297 mm and up to

381 mm

2 sheets or less

3 sheets or more

Over 381 mm and up to

432 mm

1 sheet or less

2 sheets or more

Over 432 mm

1 sheet or less

2 sheets or more

Paper length in the sub

scanning direction

monochrome printing in color mode

Monochrome printing after switched

to monochrome mode

216 mm or less

3 sheets or less

4 sheets or more

Over 216 mm and up to

297 mm

2 sheets or less

3 sheets or more

Over 297 mm and up to

381 mm

1 sheet or less

2 sheets or more

Over 381 mm and up to

432 mm

1 sheet or less

2 sheets or more

Over 432 mm

1 sheet or less

2 sheets or more

Theory of Operation Y107522-3

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Summary of Contents for d-Color MF550

Page 1: ...d Color MF550 d Color MF450 Color Printer THEORY OF OPERATION Code Y107522 3...

Page 2: ...PUBLICATION ISSUED BY Olivetti S p A 77 Via Jervis 10015 Ivrea TO Italy Copyright 2008 Olivetti All rights reserved...

Page 3: ...ft margin of the revised section The number inside represents the number of times the revision has been made To indicate clearly a page that contains the revision is shown near the page number of the...

Page 4: ...m 17 7 Scanner section IR section 18 7 1 Composition 18 7 1 1 CCD unit 19 7 2 Drive 19 7 3 Operation 20 7 3 1 Scan and exposure lamp control 20 7 3 2 Preventing stain on the DF original glass 23 7 3 3...

Page 5: ...se mechanism 49 12 Developing section 51 12 1 Composition 51 12 2 Drive 52 12 3 Operation 53 12 3 1 Developing drive control 53 12 3 2 Developer flow 54 12 3 3 Developing bias 56 12 3 4 HMT high grade...

Page 6: ...w transfer belt unit 85 14 3 10 Pressure retraction control during ACS mode 86 14 3 11 Electric discharge control before the 2nd image transfer 88 15 Toner collecting section 89 15 1 Composition 89 15...

Page 7: ...19 3 1 Heating roller structure 129 19 3 2 Whole area heating Center heating switch control 129 19 3 3 Fusing roller drive control 131 19 3 4 Fusing loop control 132 19 3 5 Fusing pressure roller pre...

Page 8: ...ing 160 23 Image processing 164 23 1 Scanner section image processing block diagram 164 23 2 Write section image processing block diagram 165 24 Other control 168 24 1 Fan control 168 24 1 1 Construct...

Page 9: ...Outline Composition Operation Theory of Operation Ver 8 0 Jun 2008 vi Blank Page d Color MF550 MF450...

Page 10: ...capacity unit LU 301 2 Authentication unit Biometric type 7 Z folding unit ZU 603 AU 101 8 Finisher FS 517 518 3 Authentication unit IC card type 9 Finisher FS 608 AU 201 10 Post inserter PI 503 4 Wor...

Page 11: ...dy 7 Scan accelerator kit SA 501 2 Stamp unit SP 501 8 Fax multi line ML 501 3 Fax kit FK 502 9 Key counter kit KIT 1 4 Security kit SC 503 10 i Option LK 101 102 103 5 Image controller IC 409 11 Upgr...

Page 12: ...201 12 Mailbin kit MT 502 4 Working table WT 502 13 Saddle sticher SD 505 5 Local interface kit EK 602 603 14 Output tray for main body OT 503 6 Mount kit MK 715 15 Finisher FS 608 7 Large capacity un...

Page 13: ...dy 7 Scan accelerator kit SA 501 2 Stamp unit SP 501 8 Fax multi line ML 501 3 Fax kit FK 502 9 Key counter kit KIT 1 4 Security kit SC 503 10 i Option LK 101 102 103 5 Image controller IC 409 11 Upgr...

Page 14: ...on system with pick up mechanism Tray 2 Roller separation system with pick up mechanism Tray 3 Roller separation system with pick up mechanism Tray 4 Roller separation system with pick up mechanism Ex...

Page 15: ...c or less Monochrome print Color print MF450 Taiwan only 85 sec or less Monochrome print 115 sec or less Color print Image loss Leading edge 4 2 mm 3 16 inch Trailing edge 3 mm 1 8 inch Rear edge 3 mm...

Page 16: ...ratios memory Metric area 3 memories Variable zoom ratios x0 250 to x4 000 Inch area in 0 001 increments Paper size Tray 1 Tray 2 Metric area A3 Wide A3 to A5S A6S post card Inch area 11 x 17 to 8 1 2...

Page 17: ...eets 80 sheets Thick paper 2 1 158 to 209 g m2 42 to 55 5 lb 250 sheets 250 sheets 700 sheets 450 sheets 70 sheets Thick paper 3 1 2 210 to 256 g m2 55 75 to 68 lb 200 sheets 200 sheets 600 sheets 400...

Page 18: ...are reliably fed D Maintenance d Color MF550 MF450 MF550 MF450 7 No of pages printed per month average Color print 5 000 prints Monochrome print 20 000 prints Standard copy mode Color print 5 pages j...

Page 19: ...r requirements Voltage AC 100 V 120 V 127 V 220 240 V Current 100 V 15 A 110 V 15 A 120 V 16 A 127 V 16 A 230 V 10 A Frequency 50 to 60 Hz r 3 Hz Max power consumption 100 V 1 500 W or less 110 V 1 65...

Page 20: ...1 sided 45 ppm 2 sided 45 ppm Printer language PCL5e c Emulation PCL6 XL Ver 3 Emulation PostScript 3 Emulation 3016 XPS Print resolution Equivalent to 1800 dpi in main scanning direction u 600 dpi i...

Page 21: ...rite section PH section Bypass section Paper feed section Tray1 Paper feed section Tray2 Toner collecting section In front door dotted line section Imaging unit section IU section Toner supply section...

Page 22: ...Theory of Operation Ver 8 0 Jun 2008 4 Paper path 13 2 Outline 4 Paper path 4 1 MF550 2 A00JT1C201AA d Color MF550 MF450 Y107522 3 Theory of Operation...

Page 23: ...1 4 Paper path Theory of Operation Ver 8 0 Jun 2008 14 Outline 4 2 MF450 1 A00KT1C202AA d Color MF550 MF450 Theory of Operation Y107522 3...

Page 24: ...ly DC charge on the PC drum 6 Laser exposure Expose photo conductor to a laser beam to develop electrostatic latent image 7 Developing The toner agitated and negatively charged in the developer mixing...

Page 25: ...age transfer process is neutralized so that it can be properly separated from the transfer belt by the paper separator claws 11 Transfer belt cleaning Residual toner on the surface of the transfer bel...

Page 26: ...Control line Image path line Original glass moving motor M202 Original glass position control boar OGPCB Scaner elay board REYB SCAN Scanner motor M201 Operation panel Printer control board PRCB Mech...

Page 27: ...relay board REYB SCAN Scanner motor M201 Original size detection 2 sensor PS205 Lens CCD unit Original cover sen sor RS201 Mirror unit Original glass moving motor M202 Exposure unit Scanner home senso...

Page 28: ...m 4036ma2602c0 37 3 m 37 3 m CCD sensor Scanning direction Sub scanning direction Main scanning direction A00JT2C003DA Scanner drive cable R Mirror unit Exposure unit Scanner motor M201 Scanner drive...

Page 29: ...lue of the CCD sensor output voltage is adjusted for R G and B 4 A shading correction is made 5 After the adjustment has been made the exposure unit moves in the return direc tion and stops at the hom...

Page 30: ...ding the original image from the leading edge The unit will finish reading the image at the back edge of the image 5 The exposure lamp will be OFF when the reading is complete 6 The exposure unit move...

Page 31: ...Operation 2 DF mode The original fed by the document feeder will be read at the original DF glass for The Exposure unit will move to the reading position and stops The document will be read as the pap...

Page 32: ...following explains the four different movements and the four different modes 1 Normal movement performed each time after reading a sheet of original The DF original glass moves slightly back or forth...

Page 33: ...a job the DF original glass moves widely back and forth to remove stain remaining on the surface This reduces the occurrence of lines in the sub scan direction 4 Split line erase movement While readin...

Page 34: ...l 2 Makes the DF original glass cleaning movement after completing a job NOTE This cleaning operation is not performed when the setting is made in the service mode as follows System 2 Split Line Detec...

Page 35: ...nsor on a machine intended for the inch areas permits detection of metric sizes With Image processing board the original size will be judged by the original size sensor and CCD An original of an irreg...

Page 36: ...43 153 187 200 213 220 9 225 261 5 274 7 284 4 284 5 OFF OFF 51 2 u 81 2 S A5S B5S 16KS A4S 81 2 u 11 S B5 16K 81 2 u 11 A4 ON OFF FLS FLS FLS OFF ON ON ON B4 8K 11 u 17 A3 Original size detection sen...

Page 37: ...tion Operation B Detection timing Original size sensors 1 PS203 and 2 PS204 20 degree sensor PS202 Exposure lamp FL201 Original cover DF open sensor RS201 Validates the original length Validates the o...

Page 38: ...2C001DA Return mirror light source Cylindrical lens Index mirror Index lens Polygon mirror Laser drive board Y LDDB Y Laser drive board C LDDB C Laser drive board M LDDB M G1 lens G2 lens G3 lens Synt...

Page 39: ...tible with the high speed printing system a seven sided polygon mirror is used The two beam array LD is used to control the growth of the polygon motor rotation speed The two beam array LD consists of...

Page 40: ...ondensing angle of each color of laser light is corrected by the G1 and G2 lenses and then reaches each return mirror 5 The K laser light is condensed on the PC drum surface via the G3 lens and return...

Page 41: ...lens G2 lens index mirror and index lens the K laser light is applied to the index board This generates an index signal This index signal has a function of keeping the same laser light emission timing...

Page 42: ...ch on both edges of the paper is however the void image area B Sub scanning direction The print start position in the sub scanning direction is determined by the image write start signal TOD that is o...

Page 43: ...b scanning direction is then calculated and stored in memory A detection pattern each in the sub scanning direction is next produced at the front and rear on the transfer belt Each of IDC registration...

Page 44: ...ng direction 2 Color skew correction Adjustment of the PH unit G3 lens skew The G3 lens is driven by the skew correction motor For an easier explanation the above illustration uses the relation betwee...

Page 45: ...sm When the skew correction motor runs the G3 lenses moves up and down to perform an automatic color skew correction A Operation timing The color registration control and the color skew control operat...

Page 46: ...is measured by the PH thermistor The color registration control and the color skew control start to operate when the machine detects a certain amount of temperature change between the current temperat...

Page 47: ...C031AA A00JT2C014DA A00JT2C013DA Imaging unit K Cleaning blade PC drum Toner collecting screw Imaging unit Y M C Developing unit Y M C Developing unit K Cleaning blade PC drum Toner collecting screw P...

Page 48: ...r 8 0 Jun 2008 9 Imaging unit 39 Composition Operation 9 2 Drive A00JT2C537DA K developing motor M19 Color PC drum motor M16 Color developing motor M17 K PC drum motor M18 d Color MF550 MF450 Y107522...

Page 49: ...cted when 24 V is turned ON as the main power switch is turned OFF and ON or the front door is opened and closed When a new IU is detected an TCR adjustment sequence is carried out 4036ma2133c0 Operat...

Page 50: ...een is displayed differently by making adjust ments to promoting expendable supplies in the service mode choice of unit replacement and IU life stop setting in the security mode If one of the color IU...

Page 51: ...to conductor section 10 1 Composition 10 2 Drive A00JT2C033AA 4036ma2338c0 Charge transport layer Charge generating layer Aluminum cylinder PC drum A00JT2C016DA PC drum C PC drum M PC drum Y Color PC...

Page 52: ...s the PC drums Y M and C while the K PC drum motor drives the PC drum K Drive is transmitted to each of the PC Drums when the triangular coupling is engaged with the mating part that also has a triang...

Page 53: ...the difference in the PC drum diameters By controlling the K PC drum motor speed the machine reduces irregu lar rotation color shift caused by eccentricity of the K PC drum drive gear The two K PC dr...

Page 54: ...by state after the end of a print cycle the PC drum small amount rota tion is made under the following timings The machine continues to print for more than a predetermined period of time The PC drum c...

Page 55: ...11 Charge Corona section A00JT2C007AA A00JT2C014DA A00JT2C013DA A00JT2C019DA A00JT2C018DA 4038T2C027AA IU K IU Y M C Corona wire Corona Wire Cleaning Lever Grid mesh Cleaning blade Corona wire PC drum...

Page 56: ...witch is turned ON or the front door is opened closed the charge corona cleaner home position is detected The charging cleaner home sensor detects the position rear of the charge corona cleaner The ch...

Page 57: ...50 or more the job is stopped and the cleaning operation is performed The count method is shown below MF550 MF450 2 Paper length in the sub scanning direction Count 216 mm or less 1 Over 216 mm and up...

Page 58: ...ide of the cleaning blade to improve cleaning performance Main erase lamp K radiation onto the surface of the PC drum removes electric charge remaining on the surface and makes the cleaning operation...

Page 59: ...2 The cleaning blade is pressed up against the surface of the PC drum scraping residual toner off the surface Blade abutting PC drum in a counter direction 3 Toner which has been scraped off the surfa...

Page 60: ...eloping unit Color developing unit K developing motor M19 Color PC drum motor M16 Color developing motor M17 K PC drum motor M18 PC drum K PC drum Y Developing roller Supply agitating conveying screws...

Page 61: ...Composition Operation 12 2 Drive A00JT2C021DA K developing motor M19 Color PC drum motor M16 Color developing motor M17 K PC drum motor M18 PC drum K PC drum Y Developing roller Supply agitating conve...

Page 62: ...Developing bias DC K Main erase Y M C Main erase K Developing bias AC Y Developing bias AC M Developing bias AC C Developing bias AC K TOD signal Video data Y Video data M Video data C Video data K 1...

Page 63: ...it is carried to the screw on the right 4 The developer is conveyed onto the developing roller The doctor blade then con trols the height of the developer brush to ensure that the developer on the dev...

Page 64: ...g Unit is conveyed further to the upper screw 4 The developer is conveyed onto the developing roller The doctor blade then con trols the height of the developer brush to ensure that the developer on t...

Page 65: ...ner to be attracted more easily to the surface of the PC drum the developing bias Vb of Vdc Vac is applied during development AC component is applied only while development is taking place At any othe...

Page 66: ...nt system With the HMT method the magnetic developer brush does not rub against the surface of the PC drum the images Accordingly sharper line images can be reproduced involv ing no uneven image densi...

Page 67: ...icles rising up inside the machine A IU Y M C For IU Y M C a color toner filter is installed at the rear of the machine and toner parti cles are trapped by the color toner suction fan motor during dev...

Page 68: ...alled under the IU and toner particles are trapped by the K toner suction fan motor during development As the K suction black toner filter and the IU unit come together as one piece they are replaced...

Page 69: ...ually The target T C ratio is 7 for both color and K The target T C ratio can be changed in the TCR level setting available from the service mode The magnetic permeability powder density of the carrie...

Page 70: ...0JT2C029DA A00JT2C007AA EEPROM board K TC ERB K EEPROM board Y M C TC ERB Y M C Toner cartridge Y M C Toner supply drive section M Toner supply drive section Y Toner supply drive section K Toner suppl...

Page 71: ...upply section Theory of Operation Ver 8 0 Jun 2008 62 Composition Operation 13 2 Drive A00JT2C031DA Toner cartridge motor C K M14 Toner cartridge motor Y M M13 d Color MF550 MF450 Theory of Operation...

Page 72: ...to the sub hopper 1 Drive of the toner cartridge motor is transmitted through a gear train to the drive gears of the toner cartridges of two colors A one way clutch is used for each of these drive ge...

Page 73: ...enished the toner cartridge motor selects a rotation speed of either low or high When much toner remains in the cartridge the toner cartridge motor rotates at the low speed When the toner cartridge ne...

Page 74: ...y the TRC sensor and amount of consumption calculated by the dot counter toner replenishing time amount is determined When the machine determines the toner replenishing sometime it detects the toner a...

Page 75: ...s less than 1 400 Sub hopper empty The machine stops printing A Toner cartridge near empty detection control When new toner is set toner remaining level is set to TC EEPROM board Based on the remainin...

Page 76: ...the toner density detected by the TCR sensor at every T C ratio detection timing is compared with the target toner density to calculate the density difference The count number defined according to eac...

Page 77: ...cartridge is removed from the machine there is a shutter mechanism provided When the toner cartridge is installed in the machine the shutter opens Put the replacement port face down to keep the cover...

Page 78: ...2C020AA 1st Image transfer roller C 1st Image transfer roller K Transfer belt drive roller Cleaning brush 1st Image transfer roller Y 1st Image transfer roller M 1st Image transfer pressure retraction...

Page 79: ...27AA A00JT2C038DA A00JT2C046AA A00JT2C055AA 2nd Image transfer roller 2nd Image transfer roller Shutter Pressure welding alienation sensor PS50 2nd image transfer pressure retraction motor M3 IDC regi...

Page 80: ...age Transfer Section A00JT2C042DA A00JT2C041DA Transfer belt motor M1 1st image transfer pressure retraction motor M21 1st Image transfer roller K 1st Image transfer roller Y 1st Image transfer roller...

Page 81: ...etraction motor M3 IDC registration sensor R IDCS R IDC registration sensor F IDCS F Pressure welding alienation sensor PS50 Cam Pressure lever Shutter 2nd Image transfer roller Paper Source Print Mod...

Page 82: ...retraction operation Pressure operation 1 Drive from the 1st Image transfer pressure retraction motor is transmitted through a gear train to the drive gear 2 Rotation of the drive gear turns the pres...

Page 83: ...print cycle starts and ends when the print cycle completes Transfer belt motor M1 1st Image transfer pressure retraction motor M21 Pressure welding alienatioin sensor color PS52 Pressure welding alie...

Page 84: ...of the Image Transfer Roller is also changed by changing the stop position of the Sliding Plate In order to reduce the first print time the machine uses the cam that can turn both for ward and backwar...

Page 85: ...M C is where the PC Drum Y M C leaves the Transfer Belt While that of the Image Transfer Roller K is where the PC Drum K is in contact with the Transfer Belt This allows the PC Drum Y M C to remain s...

Page 86: ...position change mechanism the retraction mechanism changes the position at which the pressure cam stops in order to move the retraction lever so that the retraction roller moves up and down 1 Color r...

Page 87: ...e 2nd image transfer roller against the transfer belt 3 At this timing the 2nd image transfer pressure position sensor detects that the 2nd image transfer roller gets to the pressure position The 2nd...

Page 88: ...ure operation starts when a print cycle starts and ends when the print cycle completes Transfer belt motor M1 2nd Image transfer pressure retraction motor M3 Pressure welding alienatioin sensor PS50 S...

Page 89: ...rom the transfer belt the pressure pin pushes the shutter holder This moves the shutter at the IDC sensor to the front side When the 2nd image transfer roller is pressed against the transfer belt on t...

Page 90: ...drive roller 2 The measured resistance together with the type of paper temperature and humid ity and the color or monochrome mode 1st side 2nd side is used as the basis for determining the optimum 2nd...

Page 91: ...the surface of the transfer belt is in a state of mixture of positive and negative charges The charging brush supplies negative charge to the toner to make the toner negatively charged The toner colle...

Page 92: ...uence is also carried out at the end of a print cycle that is run after the cumula tive number of printed pages produced has exceeded 300 or during a print cycle that is run after the cumulative numbe...

Page 93: ...tralizing Cloth Paper Separator Claws Transfer Belt 2nd Image Transfer Roller Paper Type Ambience Control Detailed description 1 sided printing on the plain paper Low humidity Bias applied A negative...

Page 94: ...hrough new unit detection The new unit detection is made when the power switch is turned OFF and ON the front door is opened and closed or the right door is opened and closed New unit detection timing...

Page 95: ...he monochrome mode The transfer belt being retracted prevents IU to be wasted by useless rotation Number of multiple copies of monochrome originals when the paper feed speed is 216 mm s Plain paper Nu...

Page 96: ...as listed below For the 2nd set of prints onward in electronic sorting printing using job programs A00JT2C053DA A00JT2C052DA Y M C K When printing in monochrome with color mode effecting monochrome pr...

Page 97: ...e 2nd image transfer guide are installed under the drive roller to carry paper parallel to the transfer belt This reduces electric discharge before the 2nd image transfer process and toner scattering...

Page 98: ...Composition Operation 15 Toner collecting section 15 1 Composition A00JT2C054DA A00JT2C048AA A00JT2C016AA IU toner collecting screw Transfer belt toner collecting screw Agitating screw Waste toner bo...

Page 99: ...ion 15 2 Drive A00JT2C055DA Transfer belt motor M1 Cleaning brush Agitating screw Toner collecting roller Cleaner motor M38 K PC drum motor M18 Color PC drum motor M16 Transfer belt toner collecting s...

Page 100: ...anism Toner collected by the cleaning brush of the transfer belt and waste toner in each of the imaging units are conveyed by the corresponding toner collecting screws to the waste toner box A00JT2C05...

Page 101: ...operates when the TCR sensor performs an automatic adjustment toner is forcefully replenished and the transfer belt is driven 15 3 3 Waste Toner Box in position detection The waste toner box set sens...

Page 102: ...heets A4 the machine detects a waste toner full condition and stops printing Counting method of the counter exclusive for the waste toner is corrected to count the value appropriately according to the...

Page 103: ...time automatically clearing the counter exclusive for the waste toner A different toner full warning screen is displayed if User is selected for Unit Change available from the Service Mode A00KT2E008D...

Page 104: ...A00JT2C286AA Tray1 paper feed sensor PS5 Tray1 device detection sensor PS1 Tray1 near empty sensor PS3 Paper size detect board 1 PSDTB 1 Tray1 CD paper size sensor 1 PS7 Tray1 paper empty sensor PS2...

Page 105: ...1 2 Tray3 A00JT2C300AA Tray3 paper feed sensor PS21 Tray3 upper limit sensor PS20 Tray3 near empty sensor PS22 Tray3 paper feed section Tray3 paper empty sensor PS19 A00JT2C204AA Horizontal transport...

Page 106: ...ection 97 Composition Operation 16 1 3 Tray4 A00JT2C294AA Tray4 paper feed sensor PS26 Tray4 upper limit sensor PS25 Tray4 near empty sensor PS27 Tray4 paper empty sensor PS24 A00JT2C205AA A00JT2C276A...

Page 107: ...tray1 and 2 paper feed rollers Each paper feed roller has a clutch that is turned ON when it needs to be driven A00JT2C286AA Tray1 lift up motor M6 Tray1 vertical transport motor M5 Take up motor M22...

Page 108: ...ay3 transport clutch CL6 Transport motor M25 Tray3 lift up motor M23 Tray3 paper feed roller Coupling Transport roller A00JT2C303AA Vertical transport motor M26 Horizontal transport clutch 1 CL3 Trans...

Page 109: ...Operation 16 2 4 Tray4 A00JT2C295AA Tray4 paper feed roller Tray Tray4 paper feed clutch CL7 Transport motor M25 Tray4 lift up motor M24 Tray4 paper transport roller Coupling Tray4 take up axis Verti...

Page 110: ...ick paper 1 2 3 4 Special paper Print mode Monochrome Color Monochrome Color Monochrome Color 2 2 Tray1 paper feed control timing Take up motor M22 Tray 1 paper feed clutch CL1 Tray1 paper feed sensor...

Page 111: ...to the proper one Paper from the Tray1 and Tray2 is transported at the same speed with the system speed C Double feed control After the take up motor is turned ON if it is not turned OFF no paper by...

Page 112: ...r empty is detected by the tray1 tray2 near empty sensor Paper empty is detected by the tray1 tray2 paper empty sensor The paper supply level when a paper near empty condition is detected is about 50...

Page 113: ...2 PS9 Tray2 CD paper size sensor 2 PS16 Switch 1 Switch 2 Switch 3 Switch 4 A3 OFF ON OFF OFF OFF H L B4 OFF OFF OFF ON H L A4S ON ON OFF OFF OFF L H A4 ON OFF ON ON ON H L B5S ON ON OFF ON L L B5 OFF...

Page 114: ...tion Ver 8 0 Jun 2008 16 Paper feed section 105 Composition Operation Guide A00JT2C313AA 4 3 2 1 Paper size detect board 1 PSDTB 1 Paper size detect board 2 PSDTB 2 d Color MF550 MF450 Y107522 3 Theor...

Page 115: ...nting the pick up roller will gradually come down to unblock the upper limit sensor The lift up motor will rotate again to lift up the paper lifting plate When the upper limit sensor is blocked ON the...

Page 116: ...ster than the system speed Paper feed speed varies in order to feed paper at a faster speed to ensure a proper paper interval when the interval gets longer A00JT2E526DA Transport motor M25 Tray3 paper...

Page 117: ...y1 vertical transport motor M5 Tray1 vertical transport sensor PS4 Start key ON Timing motor ON Plain paper OHP detection sensor ON Thick paper Timing roller sensor ON A00JT2C227AA Intermediate roller...

Page 118: ...the calculation for the paper supply level When the thick paper is set off set value is used to calculate the paper supply level Ex When thick paper 2 is set paper supply level is calculated as a hal...

Page 119: ...e tray3 tray4 paper empty sensor tray3 unblocking tray4 blocking The paper supply level when a paper near empty condition is detected is about 50 30 sheets A00JT2C288AA A00JT2C297AA A near empty condi...

Page 120: ...ked or that of tray4 is blocked the lift up motor rotates and starts lifting up the tray After the machine starts to lift up the tray when the upper limit sensor of tray3 is blocked or that of tray4 i...

Page 121: ...starts rotating again and lifting up the tray When the upper limit sensor of tray3 is unblocked or that of tray4 is blocked the lift up motor stops and finishes lifting up the tray The sequence of th...

Page 122: ...a different paper size press keys as follows Service mode o System setting 2 o LCC size setting Slide the paper guide plates to the positions that match the selected paper size and secure them with p...

Page 123: ...When the PC motor is running the dehumidification heater is turned OFF to reduce power consumption Dehumidification heater Color PC motor Black PC motor During fine rotation ON Halt Halt OFF ON ON OF...

Page 124: ...paper feed roller Multi FD size sensor 3 PS33 Bypass tray separator roller Multi FD size sensor 1 PS31 Paper lifting plate Bypass sub tray set sensor PS37 Bypass paper width detection resistor VR Bypa...

Page 125: ...ive A00JT2C283AA Bypass paper lower sensor PS36 Bypass paper feed motor M27 Bypass paper feed roller Bypass paper limit sensor PS35 Paper lifting plate Bypass paper feed motor M27 Bypass tray up down...

Page 126: ...of transport speed 132 mm s or more to adjust the paper interval to the proper one 17 3 2 Paper empty detection Paper empty is detected by the bypass paper empty sensor Paper empty is detected both at...

Page 127: ...d from the bypass tray turns off the exit sensor the paper lifting plate is lowered Though other jobs are being processed if the above conditions are met the paper lifting plate is lowered When the se...

Page 128: ...mm 8 13 8 125 13 25 8 25 13 8 5 13 Multi FD size sensor 1 Multi FD size sensor 2 Multi FD size sensor 3 Bypass paper width detection resistor Paper detection size Width mm OFF OFF OFF 80 to less than...

Page 129: ...B6S 201 to 231 inclusive 51 2 81 2 242 to 282 inclusive 71 4 101 2 ON OFF OFF 125 to 155 inclusive 51 2 81 2 S 169 to less than 201 71 4 101 2 S 201 to 231 inclusive 81 2 11 S 225 to less than 288 81...

Page 130: ...ypass sub tray set sensor has been installed to detect if the sub tray is open or close in order to prevent the false detection made by the multi FD size sensor 2 3 when the bypass sub tray is closed...

Page 131: ...2008 122 Composition Operation 18 Timing roller section 18 1 Composition Drive A00JT2C207AA A00JT2C272AA Timing roller 2st image transfer roller A00JT2C308AA Registration motor M2 broken line Timing...

Page 132: ...of the paper can be adjusted in the Service Mode Machine Printer Regist Loop Changing the adjustment value will change the OFF timing of the tray 1 vertical transport motor or ADU transport motor 2 A...

Page 133: ...When the OHP detection shows the different result from the setting on the operation panel printing will stop to display Error Paper type set from control panel Results of OHP detection sensor PC4 dete...

Page 134: ...tical transport roller and the intermediate roller may speed up slow down or stop temporarily during paper transportation in order to adjust the paper interval A00JT2C228AA Timing roller Timing roller...

Page 135: ...roller Soaking roller heater lamp FH2 Soaking roller Fusing unit IH coil unit Fixed at the main body side Heating roller Fusing pressure roller thermistor TH4 NC sensor TEMS Heating roller thermistor...

Page 136: ...stat TS1 NC sensor TEMS Heating roller thermistor 1 TH1 Heating roller thermistor 2 TH2 Heating roller Fusing pressure roller thermistor TH4 Fusing pressure roller Soaking roller Soaking roller thermo...

Page 137: ...ition Operation 19 2 Drive A00JT2C299AA Fusing pressure retraction motor M29 Pressure home sensor PS55 Fusing motor M30 Fusing pressure roller Fusing pressure roller Fusing retraction position sensor...

Page 138: ...m heating up while the small size paper passes or during standby mode When the demagnetization coil turns ON the magnetic field around the end of the Main coil is degaussed and only center area of the...

Page 139: ...roller end temperature Degrees centigrade CD length mm 1st demagnetization coil 265 or more 265 to 240 240 to 190 190 to 90 Standby 2 d Color MF550 MF450 200 degrees centigrade 200 degrees centigrade...

Page 140: ...l is not conducted during power save mode d Color MF550 MF450 1 MF550 fusing speed 1 MF450 fusing speed Paper type Print mode Fusing speed mm second Plain paper 60 g m2 to 90 g m2 Monochrome 264 Color...

Page 141: ...t edge of the paper reaches to the predetermined position before the fusing pressure roller 2 When the fusing speed goes faster the paper will create fewer loops between the 2nd image transfer roller...

Page 142: ...ng retraction position sensor When there is no change in output of the fusing retraction position sensor even if the given time has passed after the fusing pressure retraction motor started its rotati...

Page 143: ...degrees centigrade Soaking roller temperature 120 degrees centi grade 2 Controlled temperature at stand by nor mal operation Heating roller temperature 150 degrees centigrade Fusing pressure roller t...

Page 144: ...set only for the MF450 for Taiwan because of its low power that can be used 1 MF550 MF450 warm up completion temperature 2 MF550 only for Taiwan warm up completion temperature 3 MF450 only for Taiwan...

Page 145: ...olute humidity inside is over18 Absolute humidity Water volume contained in the air 1m3 in form of vapor regardless of the temperature A different control temperature is set only for the MF450 for Tai...

Page 146: ...0 for Taiwan because of its low power that can be used d Color MF550 MF450 1 MF550 MF450 control temperature Paper type Same control in monochrome and color Heating roller setting temperature Degree c...

Page 147: ...Degree centigrade Soaking roller setting temperature Degree centigrade Plain paper Duplex print 165 115 115 Plain paper glossy mode Duplex print 150 Thick paper 1 170 Thick paper 1 180 Thick paper 2 3...

Page 148: ...sually the pressure roller stops at low power mode though the roller rotates slightly every certain period to prevent the brush roller from being distorted 1 The temperature of the pressure roller is...

Page 149: ...r and heater lamps can be shut down before the thermostat is activated in the third level It thereby sup presses damage to the fusing unit itself Roller name Sensor name Detected temperature Degrees c...

Page 150: ...e thermostat blocks the power supply to each heater lamp The thermostat rating is 210 degrees centigrade for both the heating roller thermostat and the pressure roller thermostat The ratings do not re...

Page 151: ...are used the rotation can be detected even if either sensor get broken which improves the safety 19 3 10 Detection of a new fusing unit When a new fusing unit is installed in the machine the life coun...

Page 152: ...above 100 2 60 seconds after print start Low temperature mode when print starts and the temperature inside the unit is 18 degrees centigrade or below 70 Other than above Central temperature of the he...

Page 153: ...r single side 120 seconds for duplex after print start CD length is 290mm or more 100 CD length is 190 to 290mm System speed is 155 to 108mm s and temperature inside the unit is over 18 degrees centig...

Page 154: ...ion 20 Paper exit section 20 1 Composition A00JT2C309AA A00JT2C210AA A00JT2C280AA Exhaust sensor PS39 Paper exit roller 1 Paper exit roller 2 Switchback paper exit section Switchback roller Paper exit...

Page 155: ...Jun 2008 146 Composition Operation 20 2 Drive The exit and switch roller are driven by the exclusive motor A00JT2C310AA Fusing drive motor M4 Paper exit roller Paper exit roller 2 Switchback Motor M33...

Page 156: ...port the sheet to the duplex section Before the switchback roller starts to turn the opposite direction the exit switch gate is switched to the upward direction A00JT2C235AA Exhaust sensor PS39 Switch...

Page 157: ...8 0 Jun 2008 148 Composition Operation 21 Duplex section 21 1 Composition A00JT2C291AA A00JT2C211AA A00JT2C275AA ADU transport sensor 1 PS47 ADU door sensor PS49 ADU transport sensor 2 PS48 d Color M...

Page 158: ...position Operation 21 2 Drive 21 2 1 Duplex unit drive A00JT2C291AA ADU transport motor 1 M31 ADU transport motor 2 M32 ADU transport roller 4 ADU transport roller 3 ADU transport roller 2 ADU transpo...

Page 159: ...t if the preceding paper has not reached the timing roller the sheet stops at the stop position 2 The paper transported to the duplex part always stops at the stop position 3 and wait until paper is r...

Page 160: ...Less than 459 mm One paper feed Operation 1 One sheet of paper is supplied and the image of the sec ond page is printed 2 A00JT2C236AA A00JT2C237AA 2 Operation 2 After the paper transported to the swi...

Page 161: ...from the duplex section A00JT2C239AA 1 2 Operation 5 Exhaust the first sheet of the paper At the same time the image of fourth page is printed on the second sheet A00JT2C240AA 1 2 4 Timing roller sens...

Page 162: ...aper is supplied A00JT2C242AA 2 Operation 3 The image of the fourth page is printed on the second sheet of paper At the same time the first sheet of the paper is sent trough the duplex part and stops...

Page 163: ...rted to the duplex part At the same time the second sheet of the paper is re sup plied A00JT2C247AA 1 4 2 6 Operation 7 The image of the third page is printed on the second sheet of paper At the same...

Page 164: ...the paper and the paper is transported to the switchback part At the same time the first sheet of the paper is transported and stops at the stop position 3 At the same time the third sheet of paper is...

Page 165: ...the paper stands by at the stop posi tion 3 until the paper pitch for fourth sheet is assured A00JT2C253AA 1 2 8 4 6 Operation 7 The second sheet of the paper is re supplied and the image of the third...

Page 166: ...tration sensor Temperature humidity sensor PH temperature sensor To stabilize toner density TCR control Y M C K TCR sensor To stabilize image transfer Image transfer output control 2nd image transfer...

Page 167: ...grid voltage Vg value including the background margin adjustment value is calculated and stored in memory 22 2 3 LD laser diode intensity adjustment control It adjusts the variation in reproducibilit...

Page 168: ...adjustment pattern Gamma correction 1 Performs normal gamma correction Gamma correction 2 Performs simplified gamma correction Sequence Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 1 IDC registration sensor adj...

Page 169: ...nstalled Skew adjustment is reset Service mode After initialization and image stabilization Service mode Mode 2 The main power switch is turned ON The trouble codes and jam messages are reset After im...

Page 170: ...o color At the end of a print cycle When a print job includes many pages no image stabili zation may be performed during the printing In this case the machine forcefully execute image stabiliza tion 1...

Page 171: ...ck to color Does the count of the pages reach the predetermined count Image stabilization sequence executed Is this the last page of the print job Is this the last page of the print job Image stabiliz...

Page 172: ...the pages reach the predetermined count Does the count of the pages reach the predetermined count Does the count of the pages reach the predetermined count Is there a print mode change from black to c...

Page 173: ...made of errors that occur due to variations in sensitivity of each CCD chip and the light distribution varying along the length of the exposure lamp The shading correction is made by holding the peak...

Page 174: ...code memory DRAM 1024MB standard HDD 60GB standard 21 Area discrimination FEET 22 Interpolation 23 Gamma correction 24 Screening To PH unit 19 BTC expansion 11 Error diffusion binary 13 JBIG compress...

Page 175: ...improved reproduction of black text edge emphasis smoothing and color balance 9 In photo mode and PC print each image data of R G B is compressed to reduce the consumption of data capacity 10 Binary d...

Page 176: ...rtion 23 Multi valued data photo mode gets gamma correction at this time Makes the nec essary corrections so that the printed gradations have linear characteristics since the image density of the inpu...

Page 177: ...FP board MFP control board cooling fan motor FM17 Rear side cooling fan motor FM16 Power supply cooling fan motor FM9 Writing cooling fan motor M14 Optical cooling fan motor FM201 Fusing cooling fan m...

Page 178: ...absorbed by ozone filter and be removed Color toner suction fan motor FM7 Toner fume attached to the surface of the color IU is absorbed to be removed outside K toner suction fan motor FM8 Toner fume...

Page 179: ...per jam in trouble or when the door is open All drive systems are OFF due to the cause except paper jam trouble or door being open Full speed 1 At warm up initial operation image stabilization functio...

Page 180: ...er or initial operation At low power or sleep At paper jam in trouble or when the door is open All drive systems are OFF due to the cause except paper jam trouble or door being open Half speed Full sp...

Page 181: ...r or sleep When updating the firmware At paper jam in trouble or when the front door is open All drive systems are OFF due to the cause except paper jam trouble or door being open Half speed In standb...

Page 182: ...ow power or sleep When updating the firmware At paper jam in trouble or when the door is open All drive systems are OFF due to the cause except paper jam trouble or door being open Half speed In stand...

Page 183: ...large size counter color total copy printer print counter scan counter fax TX counter fax RX counter No of origi nals counter No of prints counter total duplex counter Counts one when an exit signal...

Page 184: ...ion Ver 8 0 Jun 2008 24 Other control 175 2 Composition Operation 24 3 Power supply unit A MF550 MF450 The main body uses a single outlet 2 A00HT2C305AA Power supply d Color MF550 MF450 Y107522 3 Theo...

Page 185: ...er switch turn OFF the sub power switch before and make sure that blue lighting of the start key turns orange and then goes out Check that power supply to the HDD is shut down Turning OFF the main pow...

Page 186: ...be identified if the per son s vein pattern matches the registered one at the time of user authentication 24 6 Authentication unit IC card type AU 201 A non contact IC card such as an employee ID card...

Page 187: ...24 Other control Theory of Operation Ver 8 0 Jun 2008 178 Composition Operation Blank Page d Color MF550 MF450 Theory of Operation Y107522 3...

Page 188: ...UPDATING STATUS DATE UPDATED PAGES PAGES CODE 10 2008 1ST EDITION 188 Y107522 3...

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