Olivetti d-Color 201MF Theory Of Operation
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Olivetti d-Color 201MF Theory Of Operation

Olivetti d-Color 201MF Theory Of Operation

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Color Printer
d-Color 201MF
THEORY OF OPERATION
Code Y109670-2

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Summary of Contents for Olivetti d-Color 201MF

  • Page 1 Color Printer d-Color 201MF THEORY OF OPERATION Code Y109670-2...
  • Page 2 PUBLICATION ISSUED BY: Olivetti S.p.A. 77, Via Jervis - 10015 Ivrea (TO) Italy Copyright © 2008, Olivetti All rights reserved...

  • Page 3: Revision History

    Revision history After publication of this service manual, the parts and mechanism may be subject to change for improvement of their performance. Therefore, the descriptions given in this service manual may not coincide with the actual machine. When any change has been made to the descriptions in the service manual, a revised version will be issued with a revision mark added as required.

  • Page 4: Table Of Contents

    Theory of operation Ver. 1.0 Sep. 2008 CONTENTS d-Color MF201 Main body Outline System configuration....................1 Product specifications ..................... 3 Section configuration....................8 Paper path....................... 9 Image creation process ..................10 Composition/Operation Overall composition....................13 Control block diagram ..................13 Scanner section (IR section) .................
  • Page 5 Theory of operation Ver. 1.0 Sep. 2008 10.3.1 PC drum drive mechanism ................. 35 10.3.2 PC drum phase control ................37 10.3.3 PC drum small amount rotation control ............38 Charge corona section..................39 11.1 Operation......................40 11.1.1 PC drum charge corona ON/OFF control ........... 40 11.1.2 Cleaning/main erase mechanism ...............
  • Page 6 Theory of operation Ver. 1.0 Sep. 2008 14.3.8 2nd image transfer roller cleaning............... 67 14.3.9 Charge neutralization and separation of paper ........... 68 14.3.10 Detection of new transfer belt unit............... 68 14.3.11 New unit detection timing/operation ............68 14.3.12 Pressure/retraction control during ACS mode..........69 14.3.13 ASC mode control change with the software SW ........
  • Page 7 Theory of operation Ver. 1.0 Sep. 2008 18.3.9 Detection of a new fusing unit..............93 18.3.10 PPM control ....................93 18.3.11 Delay control ....................93 Paper exit/switchback section ................94 19.1 Composition ....................... 94 19.2 Drive ........................95 19.3 Operation......................96 19.3.1 Paper exit control ..................

  • Page 8: Outline

    Theory of operation Ver. 1.0 Sep. 2008 1. System configuration Outline System configuration 1/2 System front view [13] [12] [11] [10] A02FT1E007AA Main body Desk DK-504 Original cover OC-508 Paper feed cabinet PC-104 Automatic document feeder [10] Paper feed cabinet PC-204 DF-612 Working table...

  • Page 9: Theory Of Operation Ver. 1.0 Sep

    1. System configuration Theory of operation Ver. 1.0 Sep. 2008 2/2 System rear view A02FT1E008AA Main body Fax multi line ML-504 Stamp unit SP-503 Fax kit FK-507 Expanded memory unit EM-310 Theory of Operation Y109670-2...

  • Page 10: Product Specifications

    Theory of operation Ver. 1.0 Sep. 2008 2. Product specifications Product specifications A. Type Type Desktop/console *1 scanner/printer Printing process Laser electrostatic printing system PC drum type OPC drum: KM-12 (OPC with high mold releasability) Scanning resolution 600 dpi File memory 64 MB + 512 MB (Option) Exposure lamp White rare-gas fluorescent lamp...
  • Page 11 2. Product specifications Theory of operation Ver. 1.0 Sep. 2008 B. Functions Types of original Sheets, books, and three-dimensional objects Max. original size Book scanner A3 or 11 x 17 Max. original weight Book scanner Max. 2 kg Multiple copies 1 to 999 Warm-up time When the sub power switch is turned ON at any timing while the main power...
  • Page 12 Theory of operation Ver. 1.0 Sep. 2008 2. Product specifications C. Paper Paper source (maximum tray capacity) Type Tray 2 Multiple bypass Tray 1 (Option) (Option) Plain paper 250 sheets 500 sheets 100 sheets (60 to 90 g/m / 16 to 24 lb) Thick paper 1 (91 to 150 g/m 24.2 to 40 lb)
  • Page 13 2. Product specifications Theory of operation Ver. 1.0 Sep. 2008 D. Maintenance Color print 500 prints No. of pages printed per month (average) Monochrome print 2,300 prints Color print 2 pages/job Standard copy mode Monochrome print 2 pages/job Color print C, M, Y, K : 5% Standard original density...
  • Page 14 Theory of operation Ver. 1.0 Sep. 2008 2. Product specifications G. Print functions Type Built-in type controller Ethernet (10Base-T or 100Base-TX), Host interface USB 2.0/1.1 Print speed 20 prints/min (color/monochrome, A4, 1-sided) Resolution 600 dpi x 600 dpi PCL5e/c emulation Printer language PCL XL Ver.

  • Page 15: Section Configuration

    3. Section configuration Theory of operation Ver. 1.0 Sep. 2008 Section configuration Scanner section (IR section) Paper exit/ switchback section Toner supply section Fusing section Duplex section Imaging unit section (Option) (IU section) Transfer section Write section (PH section) Timing roller section Toner collecting section Paper feed section (Tray1)

  • Page 16: Paper Path

    Theory of operation Ver. 1.0 Sep. 2008 4. Paper path Paper path A02FT1C004AA Y109670-2 Theory of Operation...

  • Page 17: Image Creation Process

    5. Image creation process Theory of operation Ver. 1.0 Sep. 2008 Image creation process [10] Paper [11] Transfer belt cleaning separation [1] Photoelectric conversion [8] 1st image transfer [2] IR image processing [3] Printer image processing [9] 2nd image transfer [4] PC drum [5] PC drum charging...
  • Page 18 Theory of operation Ver. 1.0 Sep. 2008 5. Image creation process [9] 2nd image transfer • A DC positive voltage is applied to the backside of the paper, thereby allowing the visible, developed image on the surface of the transfer belt to be transferred onto the paper.
  • Page 19 5. Image creation process Theory of operation Ver. 1.0 Sep. 2008 Blank Page Theory of Operation Y109670-2...

  • Page 20: Composition/Operation

    Theory of Operation Ver. 1.0 Sep. 2008 6. Overall composition Composition/Operation Overall composition Control block diagram Exposure lamp (FL201) Inverter board (INVB) Scanner part CCDU board (CCDUB) Automatic document Scanner motor (M201) BCRU bozrd feeder (BCRUB) (DF-612) Operation panel (OPEUB) ACRU board Fax part...

  • Page 21: Scanner Section (Ir Section)

    7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008 Scanner section (IR section) Composition A02FT2C060AA Home position sensor (PS201) Scanner motor (M201) 18 degree sensor (PS202) MFBU board (MFBUB) ADCU board (ADCUB) Original size detection sensor/1 (PS203) Original size detection sensor/2 (PS204) Speaker (SP)

  • Page 22: Drive

    Theory of Operation Ver. 1.0 Sep. 2008 7. Scanner section (IR section) Drive Exposure unit Home position sensor (PS201) Scanner drive wire /F Front Rear Pulley Scanner drive wire /R A02FT2C062AA Pulley shaft Scanner motor (M201) Pulley Y109670-2 Theory of Operation...

  • Page 23: Operation

    7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008 Operation 7.3.1 When the power is ON 1. The exposure unit is first returned to its home position, since it might have been moved out of the home position while the main power switch remains OFF. 2.

  • Page 24: When The Start Key Is Pressed

    Theory of Operation Ver. 1.0 Sep. 2008 7. Scanner section (IR section) 7.3.2 When the Start key is pressed A. Document read mode • The document is read in either of the following two modes: the original cover mode, in which the original is directly placed on the original glass;...
  • Page 25 7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008 (2) DF mode 1. The press of the Start key turns ON the exposure lamp. 2. The exposure unit moves from the home position to the shading position to make a shading correction.

  • Page 26: Exposure Unit

    Theory of Operation Ver. 1.0 Sep. 2008 7. Scanner section (IR section) 7.3.3 Exposure unit • This model has the exposure lamp, lens, CCD, and inverter board mounted in the expo- sure unit. Original glass 2nd mirror 3rd mirror Exposure unit Exposure Lamp 1st mirror 4th mirror...

  • Page 27: Original Size Detection Control

    7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008 7.3.4 Original size detection control A. Detection method • The reflective original size detection sensors detect the length of an original in the sub scan direction and the CCD detects the length in the main scan direction. Original size detection sensor 2 Original size detection sensor 1 (PS204, option)

  • Page 28: Write Section (Ph Section)

    Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section) Write section (PH section) Composition A02ET2C591AB Polygon motor SOS mirror Laser diode SOS sensor 4038T2C034AA Y109670-2 Theory of Operation...

  • Page 29: Operation

    8. Write section (PH section) Theory of Operation Ver. 1.0 Sep. 2008 Operation 8.2.1 Exposure path • 4 units of the printer head are used for exposure process. • The surface of the photo conductor is irradiated with a laser light and an electrostatic latent image is thereby formed.

  • Page 30: Write Control

    Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section) 8.2.2 Write control (1) Laser exposure process 1. Laser beam irradiated by the laser diode is reflected on the polygon mirror. 2. The polygon mirror is a four-faced mirror that rotates at high speed motored by the polygon motor.

  • Page 31: Writing Area

    8. Write section (PH section) Theory of Operation Ver. 1.0 Sep. 2008 8.2.3 Writing area A. Main scan direction (CD) • The writing area is determined by the paper size. • When the copy mode, writing area except for a 3.0 mm band at both paper sides. •...

  • Page 32: Color Registration Control

    Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section) 8.2.4 Color registration control • In a tandem engine, in which an independent image reproduction process is provided for different colors, incorrect color registration, or color shift, is more likely to occur due to individual PH assemblies being out of correct position or the relevant parts being out of accuracy.
  • Page 33 8. Write section (PH section) Theory of Operation Ver. 1.0 Sep. 2008 A. Types of color registration control • Color shift is misalignment of the images of three different colors, yellow (Y), magenta (M), and cyan (C), with respect to the image of black (K). •...
  • Page 34 Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section) (2) Color shift due to overall scaling error in the main scan direction • If the image of each color (Y, M, C) and the image of black (K) vary in length in the main scan direction, changing the clock frequency of the laser diode can correct the length dif- ference in the main scan direction.
  • Page 35 8. Write section (PH section) Theory of Operation Ver. 1.0 Sep. 2008 (4) Image skew • If the image of each color (Y, M, C) is tilted against the image of black (K), the image skew can be corrected by changing the angle at which the printer head is mounted on the main body installation plate.

  • Page 36: Protection Shutter Mechanism

    Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section) C. Timing of color registration control • The “color shift in the main scan direction”, “color shift due to overall scaling error in the main scan direction”, and the “color shift in the sub scan direction” are corrected when the image stabilization sequence is executed.

  • Page 37: Imaging Unit Section (Iu Section)

    9. Imaging unit section (IU section) Theory of Operation Ver. 1.0 Sep. 2008 Imaging unit section (IU section) Composition Imaging unit/Y, M, C, K PC drum/Y, M, C, K Cleaning blade Toner collecting screw Developing unit/Y, M, C, K PC drum charge corona/ Y, M, C, K Theory of Operation Y109670-2...

  • Page 38: Drive

    Theory of Operation Ver. 1.0 Sep. 2008 9. Imaging unit section (IU section) Drive Color dev. unit engaged motor (M4) Color PC motor (M3) Transport motor (M1) Developing clutch/K (CL4) A02FT2C054AA Y109670-2 Theory of Operation...

  • Page 39: Operation

    9. Imaging unit section (IU section) Theory of Operation Ver. 1.0 Sep. 2008 Operation 9.3.1 IU life control • Each IU has EEPROM board that detects a new IU and keeps track of the service life of the IU. EEPROM board 4038T2C012AA A.
  • Page 40 Theory of Operation Ver. 1.0 Sep. 2008 9. Imaging unit section (IU section) E. IU life setting • Comparing the “PC drum rotation time” with the “PC drum rotation time calculated based on the number of printed pages”, the machine detects the end of unit life when either of them reaches the set value.

  • Page 41: Photo Conductor Section

    10. Photo conductor section Theory of Operation Ver. 1.0 Sep. 2008 10. Photo conductor section 10.1 Composition PC drum Charge generating layer (CGL) Charge transport layer (CTL) Aluminum cylinder 4036ma2338c0 10.2 Drive Color PC motor (M3) Transport motor (M1) PC drum/K PC drum/C PC drum/Y PC drum/M...

  • Page 42: Operation

    Theory of Operation Ver. 1.0 Sep. 2008 10. Photo conductor section 10.3 Operation 10.3.1 PC drum drive mechanism • Two independent PC drum motors (for color and monochrome) are used for the drive mechanism to suppress incorrect color registration and uneven pitch. A.

  • Page 43: Theory Of Operation Ver. 1.0 Sep

    10. Photo conductor section Theory of Operation Ver. 1.0 Sep. 2008 B. PC drum/Y, M, C drive mechanism • The PC drums/Y, M, C are driven by the Color PC motor. • Drive is transmitted to each of the PC drums when the triangular-prism-shaped shaft is engaged with the mating coupling part.

  • Page 44: Pc Drum Phase Control

    Theory of Operation Ver. 1.0 Sep. 2008 10. Photo conductor section 10.3.2 PC drum phase control • The drive source of the PC drum/K is the transport motor. • The drive source of the PC drums/Y, M, C is the PC motor. The three PC drum drive gears/Y, M, C are connected by gears to each other and the PC drums/Y, M, C is always in the same phase.

  • Page 45: Pc Drum Small Amount Rotation Control

    10. Photo conductor section Theory of Operation Ver. 1.0 Sep. 2008 10.3.3 PC drum small amount rotation control • Humidity around the imaging unit can cause variations in sensitivity among different PC drums, allowing black bands to occur on images. In addition, ozone stagnant in areas near the PC drum charge corona reduces sensitivity of the PC drums, causing white bands to occur in the image.

  • Page 46: Charge Corona Section

    Theory of Operation Ver. 1.0 Sep. 2008 11. Charge corona section 11. Charge corona section Comb electrode Grid mesh 4038T2C027AA Grid mesh Cleaning blade Comb electrode/Y, M, C, K Comb electrode A02FT2C055AA Y109670-2 Theory of Operation...

  • Page 47: Operation

    11. Charge corona section Theory of Operation Ver. 1.0 Sep. 2008 11.1 Operation 11.1.1 PC drum charge corona ON/OFF control • The grid voltage (Vg) value applied to the grid mesh is determined through the image stabilization control. Transport motor (M1) Color PC motor (M3) Drum charge corona bias Y, M, C Drum charge corona bias K...

  • Page 48: Developing Section

    Theory of Operation Ver. 1.0 Sep. 2008 12. Developing section 12. Developing section 12.1 Composition Doctor blade Toner conveying screw Developing roller Toner supply screw 4038to503c0 Developing drive coupling/Y Developing drive coupling/M Developing drive coupling/C Developing drive coupling/K PC drum/K Developing roller/K Supply screws PC drum/Y...

  • Page 49: Drive

    12. Developing section Theory of Operation Ver. 1.0 Sep. 2008 12.2 Drive Color dev. unit engaged motor (M4) Color PC motor (M3) Transport motor (M1) PC drum/K Developing roller/K Developing clutch/K (CL4) Supply screws PC drum/Y PC drum/M A02FT2C012AB PC drum/C Imaging unit Theory of Operation Y109670-2...
  • Page 50 Theory of Operation Ver. 1.0 Sep. 2008 12. Developing section A. Developing section/K drive mechanism • Drive force from the transport motor is transmitted to the developing clutch so that the developing section/K is driven • The transport motor is the common source that provides drive to the manual feed, paper tray feed, timing roller, and transfer belt.
  • Page 51 12. Developing section Theory of Operation Ver. 1.0 Sep. 2008 B. Developing section/Y, M, C drive mechanism • Drive force from the color PC motor is transmitted to the color dev. unit engaged motor so that the developing section/Y, M, C is driven. •...
  • Page 52 Theory of Operation Ver. 1.0 Sep. 2008 12. Developing section C. Color dev. unit engaged position detection • The color PC motor is the drive source of the developing section/Y, M, C • When the color dev. unit engaged motor rotates the coupling detection gear, the color dev.

  • Page 53: Transfer Belt Pressure Retraction Clutch

    12. Developing section Theory of Operation Ver. 1.0 Sep. 2008 12.3 Transfer belt pressure retraction clutch 12.3.1 Developing drive control Transport motor (M1) Color PC motor (M3) Color dev. unit engaged motor (M4) Developing clutch/K (CL4) Drum charge corona bias/K Drum charge corona bias/Y, M, C Developing bias/K (DC) Developing bias/K (AC)

  • Page 54: Developer Flow

    Theory of Operation Ver. 1.0 Sep. 2008 12. Developing section 12.3.2 Developer flow 1. Toner supplied from the rear end of the developing unit is fed to the lower screw. It is then fed to the front of the unit, while being mixed with developer and electrically charged by the Supply screws.

  • Page 55: Developing Bias

    12. Developing section Theory of Operation Ver. 1.0 Sep. 2008 12.3.3 Developing bias • The developing bias voltage (Vdc) is applied to the developing roller so that an adequate amount of toner is attracted onto the surface of the PC drum. •...

  • Page 56: Tcr Sensor Control

    Theory of Operation Ver. 1.0 Sep. 2008 12. Developing section 12.3.4 TCR sensor control • The TCR sensor is mounted on the underside of each of the developing sections. • The sensor for C, M, Y and K is a magnetic type. •...

  • Page 57: Toner Supply Section

    13. Toner supply section Theory of Operation Ver. 1.0 Sep. 2008 13. Toner supply section 13.1 Composition Toner cartridge/K Toner cartridge/Y, M, C A02ET2C623AA A02ET2C624AA TC drive unit/CK TC drive unit/YM Toner cartridge/K Toner cartridge/Y Toner cartridge/M Toner cartridge/C A02ET2C534AA Theory of Operation Y109670-2...

  • Page 58: Drive

    Theory of Operation Ver. 1.0 Sep. 2008 13. Toner supply section 13.2 Drive Toner supply motor CK (M7) Agitating blade/K Toner supply motor YM (M6) Agitating blade/Y Agitating blade/M Agitating blade/C A02ET2C535AA Y109670-2 Theory of Operation...

  • Page 59: Operation

    13. Toner supply section Theory of Operation Ver. 1.0 Sep. 2008 13.3 Operation 13.3.1 Toner replenishing mechanism/control A. Toner replenishing mechanism • Two toner supply motors are used to supply toner of four different colors. • By changing the rotating direction of the toner supply motor/YM and toner supply motor/ CK, Y or M and C or K can be supplied, respectively.

  • Page 60: Toner Cartridge Detection

    Theory of Operation Ver. 1.0 Sep. 2008 13. Toner supply section B. Toner replenishing control • T/C is detected by TCR sensor when the developing section of the imaging unit is being operated. (TCR sensor is located in the imaging unit.) •...

  • Page 61: Toner Remainder Amount Detection

    13. Toner supply section Theory of Operation Ver. 1.0 Sep. 2008 13.3.3 Toner remainder amount detection • The amount of toner still available for use, or toner remainder amount, is determined using the toner remainder amount information stored in EEPROM or the count of the empty detection counter calculated from the T/C ratio.

  • Page 62: Shutter Mechanism

    Theory of Operation Ver. 1.0 Sep. 2008 13. Toner supply section D. Empty display • The screen mode to be displayed when a toner empty is detected can be selected by specifying the person who replaces the unit in the Unit Change in the service mode. •...

  • Page 63: Transfer Corona Section

    14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.1 Composition 14.1.1 1st image transfer section A02ET2C583AA 2nd image transfer roller 1st image transfer roller /M 1st image transfer roller /K 1st image transfer roller /Y 1st image transfer roller /C Cleaning blade Transfer belt drive roller...

  • Page 64: 2Nd Image Transfer Section

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.1.2 2nd image transfer section 2nd image transfer roller Temperature/ humidity sensor (TEM/HUM) A02FT2C043AA 4038T2C117AA IDC registration sensor/MK (IDCS/MK) IDC registration sensor/YC (IDCS/YC) 4038T2C106AA Temperature/humidity sensor (TEM/HUM) Shutter 2nd image transfer roller 2nd image transfer pressure welding alienation sensor (PS36) IDC registration sensor/MK (IDCS/MK)

  • Page 65: Transfer Belt Pressure Retraction Clutch

    14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 14.2 Transfer belt pressure retraction clutch 14.2.1 1st image transfer section Transfer belt Transport motor (M1) A02ET2C621AA Transfer belt pressure retraction clutch (CL3) Fusing motor (M2) 1st image transfer roller /K 1st image transfer roller /C Transport motor (M1) 1st image transfer roller /M...

  • Page 66: 2Nd Image Transfer Section

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.2.2 2nd image transfer section 2nd image transfer roller Shutter Pressure lever Shutter 2nd image transfer retraction motor (M5) 4038T2C019DA Y109670-2 Theory of Operation...

  • Page 67: Operation

    14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 14.3 Operation 14.3.1 Transfer belt drive mechanism • The transfer belt is driven by the transport motor. 14.3.2 1st image transfer roller mechanism • Pressure/retraction mechanism is equipped for pressing the 1st image transfer rollers (Y, M, C) to inside the transfer belt at the 1st image tansfer.
  • Page 68 Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section Transfer belt pressure retraction clutch (CL3) Fusing drive motor (M2) Drive gear Sliding plate Transfer belt retraction sensor (PS6) A02ET2C622AA • Operation timing Start key ON Paper moves past 2nd image transfer roller Fusing motor (M2) Transfer belt pressure retraction clutch (CL3) Transfer belt retraction sensor (PS6)
  • Page 69 14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 B. Pressure position changing mechanism • To extend the service life of the PC drum/Y, M, C, the pressure position of the 1st image transfer roller is changed between the monochrome mode and the color mode. •...

  • Page 70: 2Nd Image Transfer Roller Pressure Mechanism

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.3.3 2nd image transfer roller pressure mechanism • The 2nd image transfer roller has the pressure/retraction mechanism which presses to and retracts from the transfer belt so the patterns made on the transfer belt except by printing (such as detection pattern during image stabilization) will not affect the 2nd image transfer roller.

  • Page 71: Idc Sensor Shutter Mechanism

    14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 14.3.4 IDC sensor shutter mechanism • The IDC sensor can be contaminated with toner since it is located under the transfer belt. There is a shutter mechanism provided for the sensor to prevent it from being contami- nated.

  • Page 72: Atvc (Auto Transfer Voltage Control)

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.3.5 ATVC (Auto transfer voltage control) • A different fixed 1st image transfer output current value is used for each of the process speeds (full and half speed.) • To optimize image transfer output, the machine is provided with ATVC control, or auto transfer voltage control.

  • Page 73: Transfer Belt Cleaning

    14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 14.3.6 Transfer belt cleaning • The cleaning blade is pressed against the transfer belt in order to remove any residual toner from the transfer belt surface. • The cleaning blade is always pressed to the transfer belt by the fixed blade system. Toner collecting screw Transfer belt Driven roller...

  • Page 74: 2Nd Image Transfer Roller Cleaning

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.3.8 2nd image transfer roller cleaning • In order to remove the remaining toner on the 2nd image transfer roller, -/+ (DC) charge is applied alternately to transfer the remaining toner on the 2nd image transfer roller to the transfer belt.

  • Page 75: Charge Neutralization And Separation Of Paper

    14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 14.3.9 Charge neutralization and separation of paper • In order to remove the residual potential on the paper with the 2nd image transferred, the neutralization material is applied to the guide plate without contact after the 2nd image transfer roller.

  • Page 76: Pressure/Retraction Control During Acs Mode

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.3.12 Pressure/retraction control during ACS mode • The pressure/retraction of the 1st image transfer roller is controlled by the number of multiple copies for the monochrome original during multi-copy cycle, so it promotes the high productivity and extends the consumables’...
  • Page 77 14. Transfer corona section Theory of Operation Ver. 1.0 Sep. 2008 C. Operation of ACS control (1) When printing in monochrome with color mode • If there is a small number of consecutive monochrome originals, printing is effected with the 1st image transfer roller/Y, M, C kept pressed against the transfer belt. Ex.

  • Page 78: Asc Mode Control Change With The Software Sw

    Theory of Operation Ver. 1.0 Sep. 2008 14. Transfer corona section 14.3.13 ASC mode control change with the software SW • By changing the software SW 308 setting from “HEX assignment 00” to “HEX assign- ment 02”, you can change the pressure and retraction control of the 1st image transfer rollers.

  • Page 79: Toner Collecting Section

    15. Toner collecting section Theory of Operation Ver. 1.0 Sep. 2008 15. Toner collecting section 15.1 Composition A02ET2C585AA Waste toner box Waste toner collecting mechanism Transfer belt unit Waste toner box A02FT2C057AA Imaging unit Waste toner full sensor (PS8) A02ET2C545AA Theory of Operation Y109670-2...

  • Page 80: Drive

    Theory of Operation Ver. 1.0 Sep. 2008 15. Toner collecting section 15.2 Drive Transport motor (M1) IU toner collecting screw Drive transmitting mechanism for waste PC drum flange toner box A02ET2C541AA Transfer belt toner collecting screw Waste toner box toner collecting screw Y109670-2 Theory of Operation...

  • Page 81: Operation

    15. Toner collecting section Theory of Operation Ver. 1.0 Sep. 2008 15.3 Operation 15.3.1 Toner collecting mechanism • Toner collected by the cleaning blade 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.

  • Page 82: Waste Toner Near-Full/Full Detection Control

    Theory of Operation Ver. 1.0 Sep. 2008 15. Toner collecting section 15.3.3 Waste toner near-full/full detection control A. Waste toner level detection mechanism • The waste toner level is detected by the actuator and the waste toner full sensor. The actuator is turned in synchronization with the toner collecting screw that is provided in the waste toner box.
  • Page 83 15. Toner collecting section Theory of Operation Ver. 1.0 Sep. 2008 B. Waste toner level check control • The waste toner level is determined by the number of times that the waste toner full sen- sor is blocked and unblocked while the toner collecting screw makes two rotations. •...
  • Page 84 Theory of Operation Ver. 1.0 Sep. 2008 15. Toner collecting section Actuator movement in the waste toner near full condition Waste toner full sensor (PS8) Number of times that the toner full sensor is blocked and unblocked Actuator Block 2 Unblock Block 1 Block 2...
  • Page 85 15. Toner collecting section Theory of Operation Ver. 1.0 Sep. 2008 D. Waste toner level decision criteria Number of blocking and unblocking State Operation detections waste toner empty 10 times or more • Ready for printing Waste toner near full 1 to 9 times •...

  • Page 86: Paper Feed Section

    Theory of Operation Ver. 1.0 Sep. 2008 16. Paper feed section 16. Paper feed section 16.1 Tray1 16.1.1 Composition A02FT2C021AA Sensor in front of tim. roller (PS1) Tray1 feed roller Tray1 separation roller A02FT2C023AA Tray1 paper feed clutch (CL2) Tray1 device detection sensor (PS12) Tray1 paper empty sensor (PS10) Tray1 near empty sensor (PS11)

  • Page 87: Drive

    16. Paper feed section Theory of Operation Ver. 1.0 Sep. 2008 16.1.2 Drive Tray1 Feed Roller Transport motor (M1) Tray1 paper feed clutch (CL2) A02FT2C048AA 16.1.3 Paper Take-up control Start Key ON Timing roller ON Transport motor (M1) Tray1 paper feed clutch (CL2) Tim.

  • Page 88: Paper Near-Empty/Paper Empty Detection

    Theory of Operation Ver. 1.0 Sep. 2008 16. Paper feed section 16.1.4 Paper Near-Empty/Paper Empty detection • When the tray1 near empty sensor is blocked, a corresponding warning display is given on the control panel. • The paper supply level when the tray1 paper near-empty condition is detected is about 30 sheets.

  • Page 89: Paper Size Detection Control

    16. Paper feed section Theory of Operation Ver. 1.0 Sep. 2008 16.1.6 Paper size detection control • Paper width/length are detected to determine the paper size from their combination. Metric Area Tray1 FD paper size detect board Tray1 CD size detect sensor (PSDTB/1) Paper Size (PS9)
  • Page 90 Theory of Operation Ver. 1.0 Sep. 2008 16. Paper feed section Tray1 FD paper size detect board Guide (PSDTB/1) 4036ma2042c1 Y109670-2 Theory of Operation...

  • Page 91: Timing Roller Section

    17. Timing roller section Theory of Operation Ver. 1.0 Sep. 2008 17. Timing roller section 17.1 Composition Timing roller A02ET2C573AA Tim. roller clutch (CL1) 17.2 Drive Tim. roller clutch (CL1) Timing roller Transport motor (M1) A02FT2C049AA Theory of Operation Y109670-2...

  • Page 92: Operation

    Theory of Operation Ver. 1.0 Sep. 2008 17. Timing roller section 17.3 Operation 17.3.1 Timing roller control • A loop is formed in the paper when it is conveyed between the feed roller and the timing roller. The loop corrects skew in the paper. •...

  • Page 93: Fusing Section

    18. Fusing section Theory of Operation Ver. 1.0 Sep. 2008 18. Fusing section 18.1 Composition A02ET2C587AA Heating roller thermostat (TS2) Heating roller Fusing pressure roller thermistor (TH4) Heating roller heater Pressure roller lamp/L (FH1) Pressure roller heater lamp Heating roller heater (FH3) lamp/S (FH2) Fusing pressure roller...

  • Page 94: Drive

    Theory of Operation Ver. 1.0 Sep. 2008 18. Fusing section 18.2 Drive Fusing pressure roller retraction motor (M12) Fusing pressure retraction sensor (PS37) Fusing pressure roller Fusing motor (M2) Fusing pressure home sensor (PS38) Fusing belt 9J06T2C003DA Y109670-2 Theory of Operation...

  • Page 95: Operation

    18. Fusing section Theory of Operation Ver. 1.0 Sep. 2008 18.3 Operation 18.3.1 Fusing roller drive control A. Fusing roller speed change control • The fusing belt is driven by the fusing motor. The fusing pressure roller rotates along with the fusing belt.
  • Page 96 Theory of Operation Ver. 1.0 Sep. 2008 18. Fusing section B. Operation flow 1. It starts controlling when the front-edge of the paper reaches to the predetermined position before the fusing roller. 2. The fusing speed is decelerated so that a loop is formed in the paper between the 2nd image transfer roller and the fusing roller.

  • Page 97: Fusing Pressure Roller Pressure/Retraction Mechanism

    18. Fusing section Theory of Operation Ver. 1.0 Sep. 2008 18.3.3 Fusing pressure roller pressure/retraction mechanism • To ensure prolonged durability of the fusing belt, the pressure roller is retracted* from the fusing belt during any time other than a print cycle. (The roller is, however, retracted* during a print cycle using envelopes.) *1: The pressure roller does not completely retract but is slightly pressed to the fusing belt.

  • Page 98: Fusing Temperature Control

    Theory of Operation Ver. 1.0 Sep. 2008 18. Fusing section 18.3.4 Fusing temperature control • The surface temperatures of the fusing belt and pressure roller are detected using ther- mistors and the corresponding heater lamps are turned ON or OFF as necessary to maintain the set fusing temperature.

  • Page 99: Fusing Temperature Control During A Print Job

    18. Fusing section Theory of Operation Ver. 1.0 Sep. 2008 18.3.5 Fusing temperature control during a print job A. Fusing heater lamp control • Temperature setting for the fusing belt and the pressure roller varies depending on the paper type and the copy/print mode in order to prevent declining of the image stability. •...

  • Page 100: Protection From Abnormally High Temperature

    Theory of Operation Ver. 1.0 Sep. 2008 18. Fusing section 18.3.8 Protection from abnormally high temperature • The machine provides protection against abnormally high temperature of the fusing unit in the following three steps. A. Level 1 • If the heating roller thermistor/C detects a predetermined temperature or more for more than a predetermined period of time, the temperature is judged to be abnormally high.

  • Page 101: Paper Exit/Switchback Section

    19. Paper exit/switchback section Theory of Operation Ver. 1.0 Sep. 2008 19. Paper exit/switchback section 19.1 Composition A02ET2C629AA Paper exit/switch back roller Paper exit/switch back roller Fusing cover cooling fan motor (FM11) Paper exit sensor (PS2) A02FT2C042AA Theory of Operation Y109670-2...

  • Page 102: Drive

    Theory of Operation Ver. 1.0 Sep. 2008 19. Paper exit/switchback section 19.2 Drive Fusing motor (M2) Paper exit/switch back roller A02FT2C044AA Y109670-2 Theory of Operation...

  • Page 103: Operation

    19. Paper exit/switchback section Theory of Operation Ver. 1.0 Sep. 2008 19.3 Operation 19.3.1 Paper exit control A. Paper exit control • The fusing motor, which drives the paper exit/switch back roller, is controlled by the out- put from the paper exit sensor. •...

  • Page 104: Image Stabilization Control

    Theory of Operation Ver. 1.0 Sep. 2008 20. Image stabilization control 20. Image stabilization control 20.1 Overview • The machine provides the following image stabilization control to ensure stabilized copy image. Purpose Control Detection means • IDC registration sensor adjust- ment control •...

  • Page 105: Operation

    20. Image stabilization control Theory of Operation Ver. 1.0 Sep. 2008 20.2 Operation 20.2.1 IDC registration sensor adjustment control • Controls changes in characteristics due to change with time and contamination of the transfer belt and IDC registration sensor, part-to-part variations in the sensors, and change of environment.

  • Page 106: Operation Sequence

    Theory of Operation Ver. 1.0 Sep. 2008 20. Image stabilization control 20.3 Operation sequence • One of the six modes is selected for image stabilization operation. Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 IDC registra- IDC registra- IDC registra- IDC registra-...

  • Page 107: Operation Timing

    20. Image stabilization control Theory of Operation Ver. 1.0 Sep. 2008 20.4 Operation timing A. Image stabilization at initial operation Mode Operation timing Operation condition • A new transfer belt is detected • A new IU is detected (Image stabilization sequence is executed only •...
  • Page 108 Theory of Operation Ver. 1.0 Sep. 2008 20. Image stabilization control D. Image stabilization during a print job Operation conditions Print count from Absolute Temperature the last time humidity change that when image change that exceeds a pre- stabilization exceeds a pre- determined Mode Operation timing...
  • Page 109 20. Image stabilization control Theory of Operation Ver. 1.0 Sep. 2008 Operation conditions Print count from Absolute Temperature the last time humidity change that when image change that exceeds a pre- stabilization exceeds a pre- determined Mode Operation timing was performed determined value from the value from the...

  • Page 110: Image Processing

    Theory of Operation Ver. 1.0 Sep. 2008 21. Image processing 21. Image processing 21.1 Scanner section image processing block diagram 1. Photoelectric conversion CCDU board BCRU board 2. Analog-to-digital conversion To the MFBU board • The following detail the image processing operations performed by the scanner section. 1.

  • Page 111: Write Section Image Processing Block Diagram

    21. Image processing Theory of Operation Ver. 1.0 Sep. 2008 21.2 Write section image processing block diagram From scanner section MFBU board 1. Shading correction 2. Line-to-line variation correction 3. Gamma correction 4. Converting color space (RGB YMCK) 5. Background adjustment 6.
  • Page 112 Theory of Operation Ver. 1.0 Sep. 2008 21. Image processing • The following detail the image processing operations performed by MFBU board on the Write section. 1. A correction is 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.

  • Page 113: Other Control

    22. Other control Theory of Operation Ver. 1.0 Sep. 2008 22. Other control 22.1 Fan control 22.1.1 Construction Fusing cooling fan motor (FM13) Fusing cover cooling fan motor (FM11) Exhaust fan motor (FM14) Suction fan motor (FM10) Power supply cooling fan motor (FM8) Cooling fan motor/1 (FM16) A02FT2C046AA Theory of Operation...

  • Page 114: Operation

    Theory of Operation Ver. 1.0 Sep. 2008 22. Other control 22.1.2 Operation A. Function Motor name Control conditions Power supply cooling fan • To avoid temperature increase at the DC power supply section, heat motor (FM8) accumulated inside the machine will be discharged outside. Suction fan motor (FM10) •...
  • Page 115 22. Other control Theory of Operation Ver. 1.0 Sep. 2008 B. Fan control Motor name Control Control conditions (outline) Power supply cooling • When updating the firmware fan motor (FM8) • In sleep • In standby (Half speed) • At paper-jam, in trouble, or when the door is open •...
  • Page 116 Theory of Operation Ver. 1.0 Sep. 2008 22. Other control Motor name Control Control conditions (outline) Fusing cooling fan • At paper-jam, in trouble, or when the door is open motor (FM13) • When updating the firmware • In sleep •...

  • Page 117: Counter Control

    22. Other control Theory of Operation Ver. 1.0 Sep. 2008 22.2 Counter control 22.2.1 Construction Electronic counter Printer control board (PRCB) MFBU board (MFPB) Total counter A02ET2C700AA Name Function/system Total counter • Displays the cumulative number of copies and prints of all jobs. •...

  • Page 118: Parts Operated When The Main Power Switch And Sub Power Switch Are

    Theory of Operation Ver. 1.0 Sep. 2008 22. Other control 22.3 Parts operated when the main power switch and sub power switch are turned ON 22.3.1 Parts operated when the main power switch and sub power switch are turned ON •...

  • Page 119: Theory Of Operation Ver. 1.0 Sep

    22. Other control Theory of Operation Ver. 1.0 Sep. 2008 Blank Page Theory of Operation Y109670-2...
  • Page 120 UPDATING STATUS DATE UPDATED PAGES PAGES CODE 09/2008 EDITION Y109670-2...

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