This manual has been issued by Canon Inc. for qualified persons to learn technical theory, installation, maintenance, and repair
of products.
This manual covers all localities where the products are sold. For this reason, there may be information in this manual that does
not apply to your locality.
Corrections
This manual may contain technical inaccuracies or typographical errors due to improvements or changes in products.
When changes occur in applicable products or in the contents of this manual, Canon will release technical information as the
need arises. In the event of major changes in the contents of this manual over a long or short period, Canon will issue a new
edition of this manual.
The following paragraph does not apply to any countries where such provisions are inconsistent with local law.
Trademarks
The product names and company names used in this manual are the registered trademarks of the individual companies.
Use of this manual should be strictly supervised to avoid disclosure of confidential information.
Explanation of Symbols
The following symbols are used throughout this Service Manual.
SymbolsExplanationSymbolsExplanation
Check.
Remove the claw.
Check visually.
Check a sound.Push the part.
Insert the claw.
1x
1x
1x
1x
1x
1x
1x
1x
Introduction
SymbolsExplanationSymbolsExplanation
Disconnect the connector.Connect the power cable.
Connect the connector.Disconnect the power cable.
Remove the cable/wire from the
cable guide or wire saddle.
Install the cable/wire to the cable
guide or wire saddle.
Remove the screw.
Install the screw.
Cleaning is needed.Measurement is needed.
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and
mechanical systems with reference to the timing of operation.
In the diagrams, represents the path of mechanical drive; where a signal name accompanies the symbol, the arrow
indicates the direction of the electric signal.
The expression "turn on the power" means flipping on the power switch, closing the front door, and closing the delivery unit
door, which results in supplying the machine with power.
2. In the digital circuits, '1' is used to indicate that the voltage level of a given signal is "High", while '0' is used to indicate "Low".
(The voltage value, however, differs from circuit to circuit.) In addition, the asterisk (*) as in "DRMD*" indicates that the DRMD
signal goes on when '0'.
In practically all cases, the internal mechanisms of a microprocessor cannot be checked in the field. Therefore, the operations
of the microprocessors used in the machines are not discussed: they are explained in terms of from sensors to the input of
the DC controller PCB and from the output of the DC controller PCB to the loads.
The descriptions in this Service Manual are subject to change without notice for product improvement or other purposes, and
major changes will be communicated in the form of Service Information bulletins.
All service persons are expected to have a good understanding of the contents of this Service Manual and all relevant Service
Information bulletins and be able to identify and isolate faults in the machine.
List of Parts....................................................................................................................................... 99
List of External / Internal Cover............................................................................................................ 99
List of Main Unit................................................................................................................................ 101
List of Motor / Fan............................................................................................................................. 103
List of Clutch / Solenoid / Heater / Thermistor / Switch / Speaker..........................................................104
List of Sensor....................................................................................................................................105
Since radiation emitted inside the machine is completely confined within protective housings and external covers, the laser beam
cannot escape from the machine during any phase of user operation.
Therefore this machine is classified in Class 1 laser products that are regarded as safe during normal use according to
International Standard IEC60825-1.
How to Handle the Laser Scanner Unit
This machine is classified in Class 1 laser products.
However, inside the scanner unit, there is source of Class 3B laser beam and the laser beam is hazardous when entered into an
eye. So, be sure not to disassemble the laser scanner unit. No adjustment can be made to the laser scanner unit in this machine
in the field.
The label show in the following figure is attached on the laser scanner unit.
The following warnings are given to comply with Safety Principles (EN60950-1).
Diese Maschine ist der Klasse 1 der Laserprodukte zugeordnet.
Innerhalb der Scannereinheit befindet sich jedoch die Laserstrahlquelle der Klasse 3B und es ist gefährlich, wenn dieser Strahl
in die Augen gerät. Die Laserscannereinheit darf unter keinen Umständen entfernt werden. Es dürfen in diesem Umfeld der
Maschine keine Justagen an der Laserscannereinheit vorgenommen werden.
Das Etikett in folgendem Bild ist auf der Laserscannereinheit angebrachtt.
Toner Safety
About Toner
Toner is a nontoxic matter composed of plastic, iron and a trace of pigments.
CAUTION:
Never throw toner in flames to avoid explosion.
Handling Adhered Toner
• Use dry tissue paper to wipe off toner adhered to skin or clothes and wash in water.
2
ACHTUNG
Zweipolige bzw. Neutralleiter-Sicherung
Safety Precautions
• Never use warm water for cleaning up toner to prevent toner particles from being gelated to soak into fibers permanently.
• Toner particles are reactive with vinyl polymers. Avoid contacting these materials.
Notes When Handling a Lithium Battery
CAUTION:
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
The following warnings are given to comply with Safety Principles (EN60950-1).
CAUTION:
Wenn mit dem falschen Typ ausgewechselt, besteht Explosionsgefahr.
Gebrauchte Batterien gemäß der Anleitung beseitigen.
Notes on Assembly/Disassembly
Follow the items below to assemble/disassemble the device.
1. Disconnect the power plug to avoid any potential dangers during assembling/disassembling works.
2. If not specially instructed, reverse the order of disassembly to reinstall.
3. Ensure to use the right screw type (length, diameter, etc.) at the right position when assembling.
4. To keep electric conduction, binding screws with washers are used to attach the grounding wire and the varistor. Ensure to
use the right screw type when assembling.
5. Unless it is specially needed, do not operate the device with some parts removed.
6. Never remove the paint-locked screws when disassembling.
Name of Parts..................................... 14
1. Product Overview
Product Lineups
Host Machine
FunctionMF720 Series (COUNTRY / REGION)
MF728Cdw
(EUR)
Appearance
CopyYesYesYesYesYesYes
PrintYesYesYesYesYesYes
FaxYesYesYesYesNoNo
USB ScanYesYesYesYesYesYes
Network ScanYesYesYesYesYesYes
Wireless LANYesYesYesNoYesYes
Direct ModeYesYesYesNoYesYes
NFCNoYesYesNoNoNo
SENDYesYesYesYesYesYes
Sequre PrintYesYesYesYesYesYes
Remote UIYesYesYesYesYesYes
ADF (2-side)YesYesYesYesYesYes
Automatic 2-sided PrintYesYesYesYesYesYes
MF727Cdw
(CHN, KOR)
MF726Cdw
(USA/CND/
LTN, JP)
MF725Cdn
(CHN)
MF724Cdw
(EUR)
MF722Cdw
(JP)
5
Options
[2]
[1]
■ Hardware Products
1. Product Overview
No.NameDescriptionRemarks
1Cassette Feeding Module-V1Expansion of the number of sheets picked up:
250 sheets (60 to 90 g/m2)
2TELEPHONE 6 KIT Long cord Cool WhiteAddition of phoneMF728Cdw
HANDSET KIT 3 Long cord Cool WhiteStandard: MF727Cdw (CHN) /
MF725Cdn
6
434 mm
478.5 mm
1. Product Overview
Product Features
Features
■ Compact Size MFP
A compact body size for A4 color laser MFP has been realized.
■ Improved Control Panel operability
A 3.5-inch color Touch Panel is installed. Support for touch and flick has realized the operability like a smartphone.
In addition, reducing the hard keys and changing them to icons in the display have realized the UI that allows for easy
customization while maintaining the level of operability.
■ Direct Mode supported (supported models only)
Direct communication between the host machine and smartphone, tablet, PC, etc. has been realized.
■ Mobile print supported (Apple Air Print, Google Cloud Print)
Mobile print that enables printing from smartphone, tablet, PC, etc. via an application such as Google DocsTM and GmailTM has
been realized.
■ Wireless LAN supported (supported models only)
Connection between the host machine and PC by wireless communication (radio wave) via wireless LAN router has been realized.
7
1. Product Overview
Specifications
Specifications of Host Machine
ItemSpecification / Function
CopyboardFixed
Device InstallationDesktop
Light sourceLED (RGB)
PhotoreceptorOPC drum (φ24)
Image scanningCIS (color)
Light exposure methodLaser beam exposure
Charging methodRoller charging
Developing methodContact development
Transfer methodPrimary transfer: Sequential 4 colors transfer to Intermediate Transfer Belt
Secondary transfer: 4-color batch transfer onto the transfer material by the Transfer Roller
indLGL, K16, Postcard, Reply Postcard, Envelopes (COM10, Monarch, Nagagata 3, Yougatanaga 3,
C5, DL), Custom Paper Size
(Refer to “Paper types / Paper size” on page 13)
Cassette: 250 sheets (60 to 90 g/m2)
Option: 250 sheets (60 to 90 g/m2)
50 sheets (60 to 90 g/m2)
125 sheets (60 to 90 g/m2)
10 to 30 deg C
9
1. Product Overview
ItemSpecification / Function
Operational noiseAt stand-by:
• 43 dB or lower (acoustic power level)
During copy jobs:
• Color: 67 dB or lower
• B&W: 66 dB or lower
Power ratingRated input voltage: 100 V (100 V system), 120 to 127 V (120 V system), 220 to 240 V (200 V system)
Rated input frequency: 50/60 Hz
Maximum power consumption 100 V / 120 V / 230 V: 1200 W or lower
Average power at operation100 V / 120 V / 230 V: 550 W or lower
Average power at standby100 V / 120 V: 23 W
230 V: 25 W
Average power at sleep mode 100 V / 120 V / 230 V: 1 W (wired) / 2 W (wireless)
Power consumption at Main
Power Switch OFF
Ozone emissionColor: 3.0 mg/h
Dimensions (W x D x H)ADF model: 434 × 484 × 478.5 mm
WeightDevice (including toner cartridges): Approx. 31 kg
AccessoriesRefer to “Options” on page 6
0.5 W or lower
B&W: 1.5 mg/h
ADF model (with the optional cassette): 434 × 484 × 578.5 mm
Optional cassette: Approx. 4 kg
*1 : Warm-up time is an interval between when the machine is turned ON and when the main screen appears on the display.
Warm-up time may vary depending on the use conditions and environment of the machine.
*2 : The actual stack capacity varies depending on the site environment and the type of paper used.
ADF Specifications
ItemSpecification / Function
Document setting directionSet the document face up (face-up method)
*: Up to 33.6Kbps in modem speed is currently available in PSTN. Note that available modem speed is telephone-line dependent.
12
Paper types / Paper size
1. Product Overview
TypeSizeWidth di-
rection
(mm)
Recycled paper (60 to 74 g/m2)
Color paper (60 to 74 g/m2)
Plain paper 1 (60 to 74 g/m2)
Plain paper 2 (70 to 84 g/m2)
Plain paper 3 (75 to 90 g/m2)
Thick paper 1 (86 to 119 g/m2)
Thick paper 2 (120 to 128 g/m2)
Thick paper 3 (129 to 163 g/m2)
Coated paper 1 (100 to 110 g/m2)
Coated paper 2 (120 to 130 g/m2)
Coated paper 3 (155 to 165 g/m2)
Coated paper 4 (210 to 220 g/m2)
Transparency *1A4210.0297.0YesNo
LabelA4210.0297.0YesYes
PostcardPostcard100148YesYes
EnvelopesEnvelopes COM10104.7241.3YesYes
A4 *2210.0297.0YesYes
B5182.0257.0YesYes
A5148.0210.0YesYes
LGL215.9355.6YesYes
LTR *2215.9279.4YesYes
STMT139.7215.9YesYes
EXEC184.1266.7YesYes
OFFICIO215.9317.5YesYes
B-OFFICIO215.9355.0YesYes
M-OFFICIO215.9341.0YesYes
GLTR203.2266.7YesYes
GLGL203.2330.2YesYes
FLS215.9330.2YesYes
AFLS206.0338.0YesYes
indLGL215.0345.0YesYes
K16195.0270.0YesYes
Custom Paper Size-Yes *3Yes *4
A4210.0297.0YesYes
LTR215.9279.4YesYes
A4210.0297.0YesNo
LTR215.9279.4YesNo
LTR215.9279.4YesNo
LTR215.9279.4YesYes
Custom Paper Size-Yes *3Yes *4
Reply Postcard148200YesYes
Envelopes Monarch98.4190.5YesNo
Envelopes Nagagata 3120235YesYes
Envelopes Yougatanaga
3
Envelopes C5162229YesYes
Envelopes DL110220YesYes
Custom Paper Size-Yes *3Yes *4
120235YesYes
Feeding
direction
(mm)
Pickup position
MP TrayCassette
*1: Use transparency sheets for laser printers. (Canon’s genuine transparency sheets are specially recommended.)
*2: Fax-received documents or reports can be printed. (excluding heavy paper)
*3: Paper of the following custom paper sizes can be loaded.
• Width 3" to 8 1/2" (76.2 to 215.9 mm); Length 5" to 14"(127 to 355.6 mm)
*4: Paper of the following custom paper sizes can be loaded.
• Width 4" to 8 1/2" (100 to 215.9 mm); Length 5 7/8" to 14" (148 to 355.6 mm)
13
Name of Parts
1
4
6
5
3
2
9
10
8
11
14
13
12
8
7
External View
■ Front Side
1. Product Overview
No.NameNo.Name
1Feeder8Grip
2Control panel9Paper scanner for document from feeder
3Front cover10Delivery tray
4Paper cassette11Manual feed guide
5Main power switch12Copyboard glass
6Vent-hole13USB memory port
7Speaker14Multi-purpose tray (MP tray)
14
■ Rear Side
3
1
2
456
7
8
9
10
4
3
2
1
5
No.NameNo.Name
1USB port6Handset terminal
2LAN port7Rear cover
3USB port8Rating plate
4Telephone line terminal9Vent-hole
5External telephone terminal10Power socket
1. Product Overview
■ Inside
No.Name
1Y toner cartridge slot
2M toner cartridge slot
3C toner cartridge slot
4Bk toner cartridge slot
5Toner cartridge tray
15
Cross Section View
[1][2]
[3]
[4]
[5][6][7]
[8][9]
[10][11][12][13]
[14][15][16][17]
■ Host Machine
1. Product Overview
No.NameNo.Name
1Fixing assembly10MP tray feed roller
2Pressure roller11Primary transfer pad
3Fixing film unit12ITB unit
4Delivery roller13Cassette pickup roller
5Toner cartridge14Cassette separation roller
6Laser scanner unit15Registration roller
7Photosensitive drum16Secondary transfer external roller
8MP tray separation pad17Duplex feed roller
9MP tray pickup roller
16
■ Reader / ADF Unit
[1][2][3][4]
[5][6][7]
[8]
No.NameNo.Name
1ADF registration roller5Reader unit
2ADF separation roller6ADF delivery roller
3ADF pickup roller7ADF separation pad
4ADF unit8CIS unit
1. Product Overview
17
Control Panel
12
151617181920
3
4
5
6
78
9101112
1314
1. Product Overview
No.NameExplanation
1[Home] keyPress to display the <Home> Screen.
2DisplayYou can view the progress of copy, fax, and other jobs and error statuses. The display is a
touch panel, allowing you to operate the screen by touch to specify settings.
3[*] key• Press to switch the type of text that is entered.
• Press to use tone dialing such as when receiving fax information services.
4Numeric keys ([0]-[9] keys)Press to enter numbers and text.
5[#] keyPress to enter symbols such as "@" or "/".
6[Energy Saver] keyPress to put the machine into sleep mode. The key lights up green when the machine is in
sleep mode. Press the key again to exit sleep mode.
7NFC (Near Field Communication)
mark *1
8[Sound Volume] keyPress to adjust volume.
9[Stop] keyPress to cancel copying, faxing, and other operations.
10[Clear] keyPress to delete the entered numbers and text.
11[Start] (Color) keyPress to scan or copy documents in color. In addition, if you press this key when you start
12[ID] keyPress after entering the ID and PIN to log on when Department ID Management is enabled.
13[Start] (B&W) keyPress to scan or copy documents in black and white. In addition, if you press this key when
14[Reset] keyPress to cancel the settings and restore the previously specified settings.
15[Status Monitor] keyPress to check the status of printing or faxing, to view the usage history, or to view the network
16[Error] indicatorBlinks or lights up when an error such as a paper jam occurs.
17Wi-Fi indicator *2Lights up when the machine is connected to wireless LAN.
18[Processing/Data] indicatorBlinks while operations such as sending or printing are being performed. Lights up when
19[Quick Guide] keyPress to view operation guidance and error causes/solutions.
20[Back] keyPress to return to the previous screen. If you press this key when specifying settings, for
Pass an NFC-enabled smartphone,etc. with a Canon NFC-compliant application installed on
it over this mark to perform printing and other operations.
printing images from a USB memory device, printouts are printed in color.
After you finish using the machine, press this key again to log off.
you start printing images from a USB memory device, printouts are printed in black and white.
settings such as the IP address of the machine. You can also check the status of the machine,
such as the remaining amounts of paper and toner, or whether any errors occurred.
there are documents waiting to be processed.
example, the settings are not applied and the display returns to the previous screen.
*1 : Models supporting NFC only
*2 : Models supporting wireless LAN only
This device is roughly composed of the 6 functional blocks as shown in the figure below
• Document exposure/delivery system
• Controller system
• Laser exposure system
• Image formation system
• Fixing system
• Pickup / Feed System
2. Technical Explanation
■ Basic Operational Sequence
The CPU on the DC controller PCB controls the operational sequence. The table below shows the operation and the purposes
in each status from start-up of the device and to last rotation after print job completion.
WAIT
(Wait)
STBY
(STBY)
INTR
(IINTR)
PRINT
(Print)
Basic Sequence
SectionOutlineOperation
Interval from power-ON or reactivation from sleep mode upon
shutting the door(s) to entering
the print-ready status
Interval from the wait time or the
last rotation to issuance of a print
command from the main controller or power-OFF.
Interval from issuance of a print
command from the main controller during the stand-by status to
warming up the fixing assembly
to the target temperature.
Interval from the initial rotation to
completion of last page fixation.
Activate the printer to be ready for printing. During WAIT time, the following operations are done: pressure is applied to the pressure roller of the fixing assembly;
check cartridges and units being in place; move the developing unit to the home
position; and, clean the ITB. When needed, color displacement is corrected and the
image is stabilized.
Maintain the print-ready status. The printer enters the sleep mode upon receiving
a “sleep” command from the main controller during the stand-by status. The printer
executes color displacement correction or image stabilization upon receiving corresponding commands from the main controller.
To make the printer ready for print jobs, activate high-voltage bias PCBs, the laser
scanner unit and the fixing assembly.
Based on the video signals input from the main controller, form the static latent
image on the photosensitive drum to transfer and fix the toner image on paper.
When a certain pages are printed after power-ON, the device undergoes color displacement correction and/or image stabilization.
20
SectionOutlineOperation
LSTR
(Last rotation)
Interval from print job completion
to motor deactivation.
The last page of the print job is completely delivered. In this status, the laser scanner
unit and high-voltage bias PCBs are inactive. The printer starts the initial rotation
upon receiving a print command from the main controller during this status.
■ Print Sequence
See "Appendix" > "Print Sequence" in this manual.
■ Print Mode
The models of this series switch among 3 print modes to optimize the paper feed speed for printing.
2. Technical Explanation
Print modePaper feed
speed
Normal speed
1/1 speed
mode
1/2 speed mode1/2 speed
1/3 speed mode1/3 speed
Paper typePrint speedRemarks
Plain paper 1 (60 to 74 g/m2)
Plain paper 2 (70 to 84 g/m2)
Plain paper 3 (75 to 90 g/m2)
Recycled paper (60 to 74 g/m2)
Color paper (60 to 74 g/m2)
Thick paper 1 (86 to 119 g/m2)*
1
Thick paper 2 (120 to 128 g/m2)*
Coated paper 1 (100 to 110 g/m2)*
Thick paper 1 (91 to128 g/m2)*
1
Thick paper 2 (120 to 128 g/m2)*
Thick paper 3 (129 to163 g/m2)*
3
Coated paper 1 (100 to 110 g/m2)*
Postcards*
5
Thick paper 3 (129 to 163 g/m2)*
Coated paper 2 (120 to 130 g/m2)
Coated paper 3 (155 to 165 g/m2)
Coated paper 4 (210 to 220 g/m2)
Transparency
Labels
Postcards*
5
Envelopes
6
20 ppm*
Common to color and B&W
printing
2
4
2
9.7 ppm*
4
2
7.6 ppm*
6
6
*1: For Thick Paper 1 (86 to 119 g/m2), switched to normal mode when environment temperature is 20 deg C and above, and
switched to 1/2 speed mode when the temperature is lower than 20 deg C.
*2: For Thick Paper 2 (120 to 128 g/m2), switched to normal mode when environment temperature is 20 deg C and above, and
switched to 1/2 speed mode when the temperature is lower than 20 deg C.
*3: For Ticick Paper 3 (129 to 163 g/m2), switched to 1/2 speed mode when environment temperature is 20 deg C and above,
and switched to 1/3 speed mode when the temperature is lower than 20 deg C.
*4: For Coated paper 1 (100 to 110 g/m2), switched to normal mode when environment temperature is 20 deg C and above, and
switched to 1/2 speed mode when the temperature is lower than 20 deg C.
*5: For Postcard, switched to 1/2 speed mode when environment temperature is 20 deg C and above, and switched to 1/3 speed
mode when the temperature is lower than 20 deg C.
*6: The fastest print speed in each mode.
21
Document Exposure/Feeder System
Drive Belt
Drive Pulley
Drive Pulley
Contact Image Sensor (CIS)
Reader Motor
(M720)
Document Exposure System
■ Overview
Specifications / Control / Function List
ItemFunction / Method
Document ExposureLED
Document ScanBook Mode:
• Scan by the shift of the contact sensor (CIS)
ADF:
• Document stream reading by fixed contact sensor (CIS)
Scanning ResolutionColor:
• 600 dpi (horizontal scanning) x 600 dpi (vertical scanning)
• 300 dpi (horizontal scanning) x 600 dpi (vertical scanning)
• 300 dpi (horizontal scanning) x 300 dpi (vertical scanning)
Black and White:
• 600 dpi (horizontal scanning) x 600 dpi (vertical scanning)
• 300 dpi (horizontal scanning) x 600 dpi (vertical scanning)
Number of Gradations256 Gradations
Magnification25% to 400%
Horizontal scanning direction: Image processing by the Main Controller PCB
Vertical scanning direction: The speed at which the carriage moves and image processing by the Main
Controller PCB
LensCIS/Color
CISNumber of lines: 1 line
Number of pixels: 5184 pixels as total pixels (5107 pixels as effective pixels)
Maximum document scanning width: 216mm
CIS Drive ControlDrive Control by Reader Motor (M720)
Document Size DetectionNone
Dirt Sensor DetectionNone
2. Technical Explanation
■ Major Components
Followings are the major components for Document Exposure System.
• The contact sensor to scan document.
• The Reader motor (M720), The drive pulley, The drive belt, to shift The contact sensor
In image scanning control, the contact sensor is shifted by rotating the Reader motor based on the drive signal from the Main
Controller PCB and scan the original on the copyboard glass. When ADF is in use, image is scanned by feeding the originals by
ADF instead of shifting the contact sensor.
22
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