d-Color 201MF
Color Printer
THEORY OF OPERATION
Code Y109670-2
PUBLICATION ISSUED BY:
Olivetti S.p.A.
77, Via Jervis - 10015 Ivrea (TO)
Italy
Copyright © 2008, Olivetti
All rights reserved
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.
Revision mark:
• To indicate clearly a section revised, show to the left of the revised section.
A number within represents the number of times the revision has been made.
• To indicate clearly a section revised, show in the lower outside section of the corresponding page.
A number within represents the number of times the revision has been made.
NOTE
Revision marks shown in a page are restricted only to the latest ones with the old ones deleted.
• When a page revised in Ver. 2.0 has been changed in Ver. 3.0:
The revision marks for Ver. 3.0 only are shown with those for Ver. 2.0 deleted.
• When a page revised in Ver. 2.0 has not been changed in Ver. 3.0:
The revision marks for Ver. 2.0 are left as they are.
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bizhub C200
OutlineComposition/Operation
Theory of operation Ver. 1.0 Sep. 2008
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CONTENTS
d-Color MF201 Main body
Outline
1. System configuration............................................................................................... 1
2. Product specifications ............................................................................................. 3
3. Section configuration............................................................................................... 8
4. Paper path............................................................................................................... 9
5. Image creation process......................................................................................... 10
Composition/Operation
6. Overall composition............................................................................................... 13
6.1 Control block diagram......................................................................................... 13
7. Scanner section (IR section) ................................................................................. 14
7.1 Composition........................................................................................................ 14
7.2 Drive ................................................................................................................... 15
7.3 Operation ............................................................................................................ 16
7.3.1 When the power is ON ................................................................................ 16
7.3.2 When the Start key is pressed .................................................................... 17
7.3.3 Exposure unit .............................................................................................. 19
7.3.4 Original size detection control ..................................................................... 20
8. Write section (PH section)..................................................................................... 21
8.1 Composition........................................................................................................ 21
8.2 Operation ............................................................................................................ 22
8.2.1 Exposure path ............................................................................................. 22
8.2.2 Write control ................................................................................................ 23
8.2.3 Writing area................................................................................................. 24
8.2.4 Color registration control ............................................................................. 25
8.2.5 Protection shutter mechanism .................................................................... 29
9. Imaging unit section (IU section)........................................................................... 30
9.1 Composition........................................................................................................ 30
9.2 Drive ................................................................................................................... 31
9.3 Operation ............................................................................................................ 32
9.3.1 IU life control ............................................................................................... 32
10. Photo conductor section........................................................................................ 34
10.1 Composition........................................................................................................ 34
10.2 Drive ................................................................................................................... 34
10.3 Operation ............................................................................................................ 35
d-Color MF201
bizhub C200
OutlineComposition/Operation
Theory of operation Ver. 1.0 Sep. 2008
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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
11. 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 ............................................................... 40
12. Developing section................................................................................................ 41
12.1 Composition ....................................................................................................... 41
12.2 Drive ................................................................................................................... 42
12.3 Transfer belt pressure retraction clutch .............................................................. 46
12.3.1 Developing drive control ............................................................................. 46
12.3.2 Developer flow ............................................................................................ 47
12.3.3 Developing bias .......................................................................................... 48
12.3.4 TCR sensor control..................................................................................... 49
13. Toner supply section ............................................................................................. 50
13.1 Composition ....................................................................................................... 50
13.2 Drive ................................................................................................................... 51
13.3 Operation............................................................................................................ 52
13.3.1 Toner replenishing mechanism/control ....................................................... 52
13.3.2 Toner cartridge detection ............................................................................ 53
13.3.3 Toner remainder amount detection ............................................................. 54
13.3.4 Shutter mechanism ..................................................................................... 55
14. Transfer corona section......................................................................................... 56
14.1 Composition ....................................................................................................... 56
14.1.1 1st image transfer section........................................................................... 56
14.1.2 2nd image transfer section.......................................................................... 57
14.2 Transfer belt pressure retraction clutch .............................................................. 58
14.2.1 1st image transfer section........................................................................... 58
14.2.2 2nd image transfer section.......................................................................... 59
14.3 Operation............................................................................................................ 60
14.3.1 Transfer belt drive mechanism.................................................................... 60
14.3.2 1st image transfer roller mechanism........................................................... 60
14.3.3 2nd image transfer roller pressure mechanism........................................... 63
14.3.4 IDC sensor shutter mechanism .................................................................. 64
14.3.5 ATVC (Auto transfer voltage control)........................................................... 65
14.3.6 Transfer belt cleaning.................................................................................. 66
14.3.7 Reversing control of the transfer belt .......................................................... 66
d-Color MF201
bizhub C200
OutlineComposition/Operation
Theory of operation Ver. 1.0 Sep. 2008
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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 ....................................... 71
15. Toner collecting section ......................................................................................... 72
15.1 Composition........................................................................................................ 72
15.2 Drive ................................................................................................................... 73
15.3 Operation ............................................................................................................ 74
15.3.1 Toner collecting mechanism........................................................................ 74
15.3.2 Waste toner box-in-position detection......................................................... 74
15.3.3 Waste toner near-full/full detection control.................................................. 75
16. Paper feed section................................................................................................. 79
16.1 Tray1 ................................................................................................................... 79
16.1.1 Composition ................................................................................................ 79
16.1.2 Drive............................................................................................................ 80
16.1.3 Paper Take-up control ................................................................................. 80
16.1.4 Paper Near-Empty/Paper Empty detection ................................................. 81
16.1.5 Paper Interval Control (PPM Control) ......................................................... 81
16.1.6 Paper size detection control........................................................................ 82
17. Timing roller section .............................................................................................. 84
17.1 Composition........................................................................................................ 84
17.2 Drive ................................................................................................................... 84
17.3 Operation ............................................................................................................ 85
17.3.1 Timing roller control .................................................................................... 85
18. Fusing section ....................................................................................................... 86
18.1 Composition........................................................................................................ 86
18.2 Drive ................................................................................................................... 87
18.3 Operation ............................................................................................................ 88
18.3.1 Fusing roller drive control............................................................................ 88
18.3.2 Fusing loop control...................................................................................... 88
18.3.3 Fusing pressure roller pressure/retraction mechanism ............................... 90
18.3.4 Fusing temperature control ......................................................................... 91
18.3.5 Fusing temperature control during a print job ............................................. 92
18.3.6 Temperature control during stand-by .......................................................... 92
18.3.7 Temperature control during low power mode .............................................. 92
18.3.8 Protection from abnormally high temperature............................................. 93
d-Color MF201
bizhub C200
OutlineComposition/Operation
Theory of operation Ver. 1.0 Sep. 2008
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18.3.9 Detection of a new fusing unit..................................................................... 93
18.3.10 PPM control ................................................................................................ 93
18.3.11 Delay control............................................................................................... 93
19. Paper exit/switchback section ............................................................................... 94
19.1 Composition ....................................................................................................... 94
19.2 Drive ................................................................................................................... 95
19.3 Operation............................................................................................................ 96
19.3.1 Paper exit control........................................................................................ 96
20. Image stabilization control .................................................................................... 97
20.1 Overview ............................................................................................................ 97
20.2 Operation............................................................................................................ 98
20.2.1 IDC registration sensor adjustment control................................................. 98
20.2.2 Max. density adjustment control ................................................................. 98
20.2.3 LD (laser diode) intensity adjustment control.............................................. 98
20.2.4 Gamma correction control .......................................................................... 98
20.3 Operation sequence ........................................................................................... 99
20.4 Operation timing ............................................................................................... 100
21. Image processing................................................................................................ 103
21.1 Scanner section image processing block diagram ........................................... 103
21.2 Write section image processing block diagram ................................................ 104
22. Other control ....................................................................................................... 106
22.1 Fan control........................................................................................................ 106
22.1.1 Construction.............................................................................................. 106
22.1.2 Operation .................................................................................................. 107
22.2 Counter control................................................................................................. 110
22.2.1 Construction.............................................................................................. 110
22.3 Parts operated when the main power switch and sub power switch are
turned ON......................................................................................................... 111
22.3.1 Parts operated when the main power switch and sub power switch are
turned ON ................................................................................................. 111
d-Color MF201
Theory of operation Ver. 1.0 Sep. 2008 1. System configuration
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Outline
Outline
1. System configuration
1/2 System front view
*1: Option of OC-508
[1] Main body [8] Desk DK-504
[2] Original cover OC-508 [9] Paper feed cabinet PC-104
[3] Automatic document feeder
DF-612
[10] Paper feed cabinet PC-204
[4] Working table WT-503 [11] Paper feed cabinet PC-405
[5] Automatic duplex unit AD-505 [12] Job separator JS-505
[6] Multi bypass tray MB-502 [13] Assist handle AH-101 *1
[7] Paper feed cabinet (2nd) PC-105
[2]
[6]
[8][10]
[11]
[12]
[1]
[3]
[13]
A02FT1E007AA
[4]
[7]
[5]
[9]
Y109670-2 Theory of Operation
d-Color MF201
1. System configuration Theory of operation Ver. 1.0 Sep. 2008
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Outline
2/2 System rear view
[1] Main body [4] Fax multi line ML-504
[2] Stamp unit SP-503 [5] Fax kit FK-507
[3] Expanded memory unit EM-310
[2]
[1]
[4]
[5]
A02FT1E008AA
[3]
Theory of Operation Y109670-2
d-Color MF201
Theory of operation Ver. 1.0 Sep. 2008 2. Product specifications
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Outline
2. Product specifications
A. Type
*1: Only when the optional paper feed cabinet/desk is installed.
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
Platen Stationary (Unit scan)
Original scanning
Unit scanning CCD optical system
* Sheet through system when DF-612 is used
Registration Rear left edge
Paper feeding
separation system
Tray 1 : Small roller separation system with torque limiter
Exposure system
• Four-multi array PH unit system
• Polygon mirror scan system
Exposure resolution 600 dpi u 600 dpi
Developing system Dry 2 components developing method, HMT developing system
Charging system DC comb electrode scorotron system
Neutralizing system Red LED system
Image transfer system Belt image transfer system (1st)/roller image transfer system (2nd)
Paper separating
system
Combination of curvature, separating claws, and bias system
Fusing system Belt fusing
Heating system Halogen lamp
Y109670-2 Theory of Operation
d-Color MF201
2. Product specifications Theory of operation Ver. 1.0 Sep. 2008
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Outline
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
(at ambient temperature of 23 °C/73.4 °F
and rated source voltage)
*Without FK-507 and
EM-310
When the sub power switch is turned ON at any timing while the main power
switch remains ON for a predetermined period of time or more:
37 sec. or less (Monochrome print)
40 sec. or less (Color print)
When the sub power switch is turned ON immediately after the main power
switch is turned ON:
90 sec. or less (Monochrome print and Color print)
Image loss Copy Leading edge: 4.2 mm (3/16 inch),
Trailing edge: 3 mm (1/8 inch),
Rear edge: 3 mm (1/8 inch),
Front edge: 3 mm (1/8 inch)
PC Print Leading edge: 4.2 mm (3/16 inch),
Trailing edge: 4.2 mm (3/16 inch),
Rear edge: 4.2 mm (3/16 inch),
Front edge: 4.2 mm (3/16 inch)
First copy time
(Tray1 A4 or 8
1
/2 x 11,
full size)
Monochrome print 10.0 sec. or less
Color print 13.5 sec. or less
Processing speed 92.4 mm/s Plain paper (monochrome, full color), OHP film
46.2 mm/s Thick 1, Thick 2, Thick 3,
Envelope, Label sheet
Copying speed for
multi-copy cycle
1-sided 20 copies/min (A4 or 8
1
/2 x 11, plain paper)
2-sided 18 copies/min (A4 or 8
1
/2 x 11, plain paper)
Fixed zoom ratios Full size x1.000
Reduction Metric area x0.500, x0.707, x0.816, x0.866
Inch area x0.500, x0.647, x0.772, x0.785
Enlargement Metric area x1.154, x1.224, x1.414, x2.000
Inch area x1.214, x1.294, x1.545, x2.000
Zoom ratios memory 3 memories
Variable zoom ratios u0.250 to u4.000 in 0.001 increments
Paper size Tray 1 Metric area B6S, A5, A5S, B5, B5S, A4, A4S, A3,
A3 Wide, 8K, 16K, 16KS, FLS,
A6S (Thick paper only)
Inch area 5-
1
/2 x 8-1/2, 5-1/2 x 8-1/2S, 7-1/4 x 10-1/2,
7-
1
/4 x 10-1/2S, 8-1/2 x 11, 8-1/2 x 11S,
8-
1
/2 x 14, A3 Wide (12 x 18)
4 x 6 (Thick paper only)
Copy exit tray capacity Plain paper 250 sheets
Thick paper 10 sheets
OHP film 1 sheet
Theory of Operation Y109670-2
d-Color MF201
Theory of operation Ver. 1.0 Sep. 2008 2. Product specifications
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Outline
C. Paper
*1: Image is not guaranteed when thick paper 3 is used.
*2: Monochrome print only.
Automatic duplex unit : Only the plain paper weighing 64 to 90 g/m
2
(17 to 24 lb) or
thick paper weighing 91 to 256 g/m
2
(24.2 to 68 lb) are
reliably fed.
Ty pe
Paper source (maximum tray capacity)
Tra y 1
Tra y 2
(Option)
Multiple bypass
(Option)
Copy paper
type
Plain paper
(60 to 90 g/m
2
/ 16 to 24 lb)
250 sheets 500 sheets 100 sheets
Thick paper 1
(91 to 150 g/m
2
/
24.2 to 40 lb)
20 sheets
150 sheets
20 sheets
Thick paper 2
(151 to 209 g/m
2
/
40.2 to 55.6 lb)
Thick paper 3
(210 to 256 g/m
2
/
55.9 to 68.1 lb) *1
OHP film
(crosswise feeding only) *2
Label sheets
Envelopes 10 sheets
Postcards
Translucent paper
Copy paper
dimensions
Width
90 to 311.1 mm
3.6 to 12.3 inch
139.7 to 297 mm
5.5 to 11.7 inch
90 to 311.1 mm
3.6 to 12.3 inch
Length
139.7 to 457.2 mm
5.5 to 18 inch
182 to 431.8 mm
7.2 to 17 inch
139.7 to 457.2 mm
5.5 to 18 inch
Y109670-2 Theory of Operation
d-Color MF201
2. Product specifications Theory of operation Ver. 1.0 Sep. 2008
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Outline
D. Maintenance
E. Machine specifications
*1: Width when the manual bypass tray is closed
*2: Height up to the original glass
*3: The paper feed tray is slide out, and the upper right door is open.
F. Operating environment
No. of pages printed
per month (average)
Color print 500 prints
Monochrome print 2,300 prints
Standard copy mode
Color print 2 pages/job
Monochrome print 2 pages/job
Standard original
density
Color print C, M, Y, K : 5%
Monochrome print K : 5%
Power requirements
Voltage: AC 100 V, 120 V, 220-240 V
Current: 100 V 12 A
110 V 12 A
120 V 11 A
127 V 11 A
230 V 6 A
Frequency: 50/60 Hz r 3 Hz
Max power consumption 1,250 W or less
Dimensions *2
620 *1 (W) x 688 (D) x 648 (H) mm
24.5 *1 (W) x 27.0 (D) x 25.5 (H) inch
Space requirements
650 (W) x 688 (D) mm *2
25.6 (W) x 270 (D) inch *2
1117 (W) x 1061 (D) mm *3
44.0 (W) x 41.8 (D) inch *3
Weight
Machine Approx. 68 kg / 150 lb (without IU and TC)
IU and TC Approx. 6.8 kg / 15 lb
Temperature 10 to 30qC / 50 to 86 qF (with a fluctuation of 10 qC / 18 qF or less per hour)
Humidity 15 to 85% (Relative humidity with a fluctuation of 10%/h)
Levelness Difference between front and back, right and left should be 1 degree or under.
Theory of Operation Y109670-2
d-Color MF201
Theory of operation Ver. 1.0 Sep. 2008 2. Product specifications
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Outline
G. Print functions
• When the optional automatic duplex unit AD-505 is mounted, the optional expanded
memory unit EM-310 is required for duplex printing from the PC.
H. Scan functions
NOTE
• These specifications are subject to change without notice.
Type Built-in type controller
Host interface
Ethernet (10Base-T or 100Base-TX),
USB 2.0/1.1
Print speed 20 prints/min (color/monochrome, A4, 1-sided)
Resolution 600 dpi x 600 dpi
Printer language
PCL5e/c emulation
PCL XL Ver. 2.1 emulation
PostScript 3 emulation (3015)
Network protocol TCP/IP, LPD
Support OS
Server
Windows 2000/2003
Windows 2003server x64 Edition
Client
Windows 2000, Windows XP, Windows Vista
Windows XP x64 Edition, Windows Vista x64 Edition
Macintosh OS 9.x, Macintosh OS X Ver. 10.2 or later,
Macintosh Intel OS X 10.4 or later
Compatible paper size Max. standard paper size A3 Wide
Fonts
PCL Latin 80 fonts
PS Latin 136 fonts
Type Full-Colour Scanner
Protocol TCP/IP(SMTP)
Output format JPEG, PDF(V1.3 standrads), TIFF
Scan speed
/ DF-612
Monochrome
(Resolution 300 dpi)
40 pages/min : A4
40 pages/min : 8
1
/2 x 11
Full color
(Resolution 300 dpi)
20 pages/min : A4
20 pages/min : 8
1
/2 x 11
Scannable range Same as the copier (Max. A3)
Functions Scan to E-mail
Resolution 200/300/400/600 dpi
Y109670-2 Theory of Operation
d-Color MF201
3. Section configuration Theory of operation Ver. 1.0 Sep. 2008
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Outline
3. Section configuration
A02FT1C003AA
Scanner section (IR section)
Fusing section
Timing roller section
Write section
(PH section)
Manual bypass section
(Option)
Paper feed section
(Tray1)
Paper feed section
(Tray2, Option)
Toner collecting section
Imaging unit section
(IU section)
Toner supply section
Duplex section
(Option)
Paper exit/
switchback section
Transfer section
Theory of Operation Y109670-2
d-Color MF201
Theory of operation Ver. 1.0 Sep. 2008 4. Paper path
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Outline
4. Paper path
A02FT1C004AA
Y109670-2 Theory of Operation
d-Color MF201
5. Image creation process Theory of operation Ver. 1.0 Sep. 2008
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5. Image creation process
[1] Photoelectric
conversion
• The light reflected off the surface of the original is separated into different
colors using the color filters (R, G, and B); CCD then converts it into a corresponding electric signal and outputs the signal to the IR imaging processing section.
[2] IR image
processing
• The electric signal is converted to 8-bit digital image signals. After going
through some corrections, video signals (C, M, Y, and K) are output to the
printer image processing section.
[3] Printer image
processing
• D/A conversion will be performed after the VIDEO signals (Y, M, C, Bk) are
corrected. This data will control the emission of the laser diode.
[4] PC drum • The image of the original projected onto the surface of the PC drum is
changed to a corresponding electrostatic latent image.
[5] PC drum charging • Supply 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 chamber, is attracted onto the electrostatic latent image formed on the surface of
the PC drum. It is thereby changed to a visible, developed image.
• AC and DC negative bias voltages are applied to the developing roller,
thereby preventing toner from sticking to the background image portion.
[8] 1st image transfer • A DC positive voltage is applied to the backside of the transfer belt,
thereby allowing the visible, developed image on the surface of each of the
PC drums (Y, M, C, and K) to be transferred onto the transfer belt.
A02FT1C007AA
[4] PC drum
[5] PC drum
charging
[1] Photoelectric
conversion
[2] IR image
processing
[3] Printer image
processing
[6] Laser exposure
[7] Developing
[8] 1st image transfer
[9] 2nd image
transfer
[11] Transfer belt cleaning
[13] Main erase
[12] PC drum cleaning
[10] Paper
separation
Theory of Operation Y109670-2
d-Color MF201
Theory of operation Ver. 1.0 Sep. 2008 5. Image creation process
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Outline
[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.
[10] Paper separation • The paper, which has undergone the 2nd image transfer process, is neu-
tralized 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 belt is collected for cleaning
by cleaning blade.
[12] PC drum cleaning • The residual toner left on the surface of the PC drum is scraped off.
[13] Main erase • The surface of the PC drum is irradiated with light, which neutralizes any
surface potential remaining on the surface of the PC drum.
Y109670-2 Theory of Operation
d-Color MF201
5. Image creation process Theory of operation Ver. 1.0 Sep. 2008
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Outline
Blank Page
Theory of Operation Y109670-2
d-Color MF201
Theory of Operation Ver. 1.0 Sep. 2008 6. Overall composition
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Composition/Operation
Composition/Operation
6. Overall composition
6.1 Control block diagram
Exposure lamp (FL201)
Inverter board (INVB)
CCDU board (CCDUB)
BCRU bozrd
(BCRUB)
MFBU board (MFBUB)
Image
processing
PH relay board
(REYB/PH)
PH unit
Y/M/C/K
Control line
Image path line
Scanner motor (M201)
Printer control board
(PRCB)
Mechanical
control (CPU)
Finisher option
(JS-505)
Process
Fusing
Automatic
document
feeder
(DF-612)
Paper feed,
Transport,
Duplex feed
Paper feed option
(PC-104/105/204/405/
MB-502/AD-505
RAMU board
Fax part
Scanner part
Printer part
Operation panel (OPEUB)
ADCU
board
FAX board
(FAXUB,
Basis,
Option )
FAX board
(FAXUB,
Extension,
Option )
ACRU
board
A02FT2E100AA
Y109670-2 Theory of Operation
d-Color MF201
7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008
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Composition/Operation
7. Scanner section (IR section)
7.1 Composition
A02FT2C061AA
18 degree sensor (PS202)
Scanner motor (M201)
Original size detection sensor/1 (PS203)
Lens
CCDU board (CCDUB) Original cover sensor (PS205)
Home position sensor (PS201)
Inverter board (INVB)
A02FT2C060AA
Speaker (SP)
Original size detection sensor/2
(PS204)
ADCU board (ADCUB)
MFBU board (MFBUB)
BCRU board (BCRUB)
Exposure lamp (FL201)
Theory of Operation Y109670-2
d-Color MF201
Theory of Operation Ver. 1.0 Sep. 2008 7. Scanner section (IR section)
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Composition/Operation
7.2 Drive
A02FT2C062AA
Scanner drive wire /R
Exposure unit
Scanner motor (M201)
Scanner drive wire /F
Home position sensor (PS201)
Front
Pulley shaft
Rear
Pulley
Pulley
Y109670-2 Theory of Operation
d-Color MF201
7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008
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Composition/Operation
7.3 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. The exposure unit moves from the home position to the exposure lamp ON position.
3. After the exposure lamp has been turned ON, the exposure unit moves up to the
shading position (under the shading correction sheet).
4. The shading correction is made while the exposure unit is moving.
5. After the adjustment has been made, the exposure unit moves from the shading
position to the home position.
A02FT2C065AA
A02FT2C063AA
Home position
Home position
Shading position
Shading position
Shading correction
Standby position
Exposure lamp (FL201) ON
Exposure unit movement
Exposure unit
Exposure lamp ON
Theory of Operation Y109670-2
d-Color MF201
Theory of Operation Ver. 1.0 Sep. 2008 7. Scanner section (IR section)
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Composition/Operation
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; and the DF mode, in which the
document is loaded in the automatic document feeder.
(1) Original cover 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.
3. The exposure unit moves from the shading position to the scan start position.
4. The exposure unit moves from the scan start position toward the image trailing
edge direction.
Reading of the image of the original is started with the image leading edge position.
Reading of the image of the original is completed at the image trailing edge position.
5. After the image of the original has been read, the exposure lamp turns OFF.
6. The exposure unit moves from the image trailing edge position to the home position.
The R, G, and B data are stored in memory through a single scan motion, so the
scan sequence is carried out only once even for color copying.
A02FT2C067AA
A02FT2C066AA
Exposure lamp (FL201) ON
Shading position
Home position
Scan start position
Leading edge of the image
Original
Back edge of the image
Exposure unit
Shading position
Home position
Back edge of the image
Scan
Return
Shading correction
Y109670-2 Theory of Operation
d-Color MF201
7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008
18
bizhub C200
Composition/Operation
(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.
3. The exposure unit moves from the shading position to the DF document read position.
4. The document in the automatic document feeder is fed up to the document read
position and the exposure unit reads the image of the document.
5. After the image of the document has been read, the exposure lamp turns OFF.
6. The exposure unit moves from the document read position to the home position.
7. The R, G, and B data are stored in memory through a single scan motion, so the
scan sequence is carried out only once even for color copying.
A02FT2C068AA
A02FT2C069AA
Reading of the image of the document
Automatic document feeder (DF-612)
Exposure lamp (FL201) ON
Shading position
Home position
Return
Shading correction
Home position
Original
Image reading
position
Theory of Operation Y109670-2
d-Color MF201
Theory of Operation Ver. 1.0 Sep. 2008 7. Scanner section (IR section)
19
bizhub C200
Composition/Operation
7.3.3 Exposure unit
• This model has the exposure lamp, lens, CCD, and inverter board mounted in the exposure unit.
A02FT2C064AB
Exposure unit
Original glass
Exposure Lamp
LensCCD
1st mirror
4th mirror
3rd mirror2nd mirror
5th mirror
Y109670-2 Theory of Operation
d-Color MF201
7. Scanner section (IR section) Theory of Operation Ver. 1.0 Sep. 2008
20
bizhub C200
Composition/Operation
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.
*1: Size detectable only if the optional original size detection sensor 2 is mounted
Original size CCD width (mm)
Original size detection
sensor 1
(PS203, Standard)
Original size detection
sensor 2
(PS204, option)
Small size original 0 to 135 OFF Unset/OFF
5-
1
/2 x 8-1/2S
135 to 144 OFF Unset/OFF
A5S 144 to 163 OFF Unset/OFF
B5S 163 to 188 OFF Unset/OFF
16KS *1 188 to 199 OFF OFF
A4S 199 to 213 OFF Unset/OFF
8-
1
/2 x 11S
213 to 226
OFF Unset/OFF
8-
1
/2 x 13 *1
ON OFF
8-
1
/2 x 14
ON Unset/ON
B5
226 to 262
OFF Unset/OFF
B4 ON Unset/OFF/ON
16K *1
262 to 275
OFF OFF
8K *1 OFF ON
8-
1
/2 x 11
275 to 289
OFF Unset/OFF
11 x 17 ON Unset/OFF/ON
A4
289 to 301
OFF Unset/OFF
A3 ON Unset/OFF/ON
(non original) 301 or more OFF OFF
Original size detection sensor 1
(PS203, Standard)
A02FT2C060AA
Original size detection sensor 2
(PS204, option)
Theory of Operation Y109670-2
d-Color MF201
Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section)
21
bizhub C200
Composition/Operation
8. Write section (PH section)
8.1 Composition
4038T2C034AA
SOS mirror
Laser diode
Polygon motor
SOS sensor
A02ET2C591AB
Y109670-2 Theory of Operation
d-Color MF201
8. Write section (PH section) Theory of Operation Ver. 1.0 Sep. 2008
22
bizhub C200
Composition/Operation
8.2 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.
• The polygon mirror, which has only four faces.
• The laser light emitted from the laser diode scans one line for each face of the polygon
mirror.
YMC K
Transfer belt
2nd image transfer roller
LD/KLD/Y LD/M LD/C
PC drum Y
Direction of
rotation of
the PC drum
Beam
One lines
One scan
Surface of the PC drum
A02FT2E101AA
PC drum
Polygon
mirror
Laser diode
Direction
of rotation
of the PC
drum
Beam
Return mirror 2
G2 lens
G1 lens
Return mirror 1
Theory of Operation Y109670-2
d-Color MF201
Theory of Operation Ver. 1.0 Sep. 2008 8. Write section (PH section)
23
bizhub C200
Composition/Operation
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. The polygon mirror reflects the incoming laser beam in the main
scanning direction and reflects it on the G1 lens.
3. The G1 lens corrects the converging angle of the incoming laser beam and reflects
it on the return mirror 1.
4. Return mirror 1 reflects the laser beam collected by the G1 lens to the G2 lens.
5. G2 lens reflects the laser beam collected by the return mirror 1 on the return mirror
2.
6. The return mirror 2 irradiates the laser beam came from G2 lens to the PC drum.
(2) Laser emission timing
• When a ready signal is detected after the lapse of a given period of time after a print
cycle has been started, a laser ON signal is output from the printer control board.
• The laser ON signal triggers the firing of each laser light which illuminates the SOS sensor via the polygon mirror, G1 lens, and SOS mirror to generate a SOS (Start of Scan)
signal.
• This SOS signal unifies the timing at which laser light is irradiated to each main scan line.
4038T2C028AA
G1 lens
SOS mirror
Laser diode
Polygon motor
SOS sensor
Return mirror 1
Return mirror 2
G2 lens
PC drum
Y109670-2 Theory of Operation
d-Color MF201
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