Canon printer PIXMA MX850 User Manual

							127 Routine Maintenance
3With a soft, clean, lint-free and dry cloth, wipe 
off any paper dust from the inside of the 
Document Feeder Cover (A).
4After wiping, close the Document Feeder 
Cover by pushing it until it clicks into place.
5Close the Document Tray.
„Cleaning the Paper Feed Roller (Roller Cleaning)
Clean the paper feed roller if paper is not fed properly. Cleaning the paper feed roller will wear 
the roller, so perform this only when necessary.
1Make sure that the machine is turned on, and then remove any paper from the 
Rear Tray and Cassette.
2Press the Feed Switch to select the paper source to clean.
3Clean the paper feed roller.
(1)Press the Menu button.
(2)Use the [ or ] button to select Maintenance/settings, then press the OK button.
The Maintenance/settings screen is displayed.
(3)Use the [ or ] button to select Maintenance, then press the OK button.
The Maintenance screen is displayed.
(4)Use the { or }
 button to select Roller cleaning, then press the OK button.
The confirmation screen is displayed.
(5)Use the { or }
 button to select Ye s, then press the OK button.
The Paper Feed Roller will rotate as it is cleaned.
4Repeat (4) and (5) in step 3 twice.
5Open the Paper Output Tray, and then open the Output Tray Extension.
(1)Press the Open button to open the Paper Output Tray.
(2)Open the Output Tray Extension.
6Make sure that the paper feed roller stops rotating, then load three or more sheets 
of A4 or Letter-sized plain paper in portrait orientation in the paper source you 
selected in step 2.
CautionzThe power cannot be turned off while the machine is sending or receiving a fax, or when there 
are unsent faxes stored in the machine’s memory.
zThe machine cannot receive faxes when the power is turned off.
zIf you disconnect the power cord, all the documents stored in memory are deleted. Send or print 
necessary documents before disconnecting the power cord.
Note
Make sure that the Inner Cover is closed.
(A) 
						

							128Routine Maintenance
7Repeat (4) and (5) in step 3 three times.
The paper cleans the paper feed roller as it feeds through the machine.
If the problem is not resolved, turn off the machine, disconnect the power cord, and then wipe 
the paper feed roller (A) located on the right side inside the Rear Tray with a moistened cotton 
swab or the like. Rotate the roller (A) manually as you clean it. Do not touch the roller with your 
fingers; rotate it with the cotton swab.
If the problem is still not resolved after performing the procedure above, contact your Canon 
service representative.
„Cleaning the Inside of the Machine (Bottom Plate Cleaning)
This section describes how to clean the inside of the machine. If the inside of the machine 
becomes dirty, printed paper may get dirty, so we recommend performing cleaning regularly.
1Make sure that the machine is turned on, and then remove any paper from the 
Rear Tray.
2Open the Paper Output Tray, and then open the Output Tray Extension.
(1)Press the Open button to open the Paper Output Tray.
(2)Open the Output Tray Extension.
3Fold a single sheet of A4 or Letter-sized plain paper in half widthwise, and then 
unfold the paper.
ImportantzEven if the Cassette is selected as the paper source, paper will be fed from the Rear Tray.
zDo not perform any other operation while the bottom plate is being cleaned.
Note
Make sure that the Inner Cover is closed.
(A) 
						

							
129
Routine Maintenance
4Load only this sheet of paper in the Rear 
Tray with the open side to the front.
5Perform bottom plate cleaning.
(1) Press the  Menu button.
(2) Use the  [ or  ] button to select  Maintenance/settings , then press the OK button.
The  Maintenance/settings  screen is displayed.
(3) Use the  [ or  ] button to select  Maintenance, then press the  OK button.
The  Maintenance  screen is displayed.
(4) Use the  { or  }
 button to select  Bottom plate cleaning , then press the OK button.
The confirmation sc reen is displayed.
(5) Use the  { or  }
 button to select  Ye s, then press the  OK button.
The paper cleans the inside of the machine as it feeds through the machine.
Check the folded part of the ejected paper. If it is smudged with ink, perform Bottom Plate 
Cleaning again.
If the problem is not resolved after performing Bottom Plate Cleaning twice, the protrusions 
inside the machine may be stained. Clean them  according to instructions. See “Cleaning the 
Protrusions Inside the Machine” on page 130.
Note
When performing Bottom Plate Cleaning again, make sure to use a new piece of paper.
(A)
(A) Load the paper after unfolding it. 
						

							130Routine Maintenance
„Cleaning the Protrusions Inside the Machine
If protrusions inside the machine are stained, wipe off any ink from the protrusions using a cotton 
swab or the like.
CautionzBe sure to turn off the power and disconnect the power cord before cleaning the machine.
zThe power cannot be turned off while the machine is sending or receiving a fax, or when there 
are unsent faxes stored in the machine’s memory.
zThe machine cannot receive faxes when the power is turned off.
zIf you disconnect the power cord, all the documents stored in memory are deleted. Send or print 
necessary documents before disconnecting the power cord. 
						

							
131
Troubleshooting
Troubleshooting
This section describes troubleshooting tips  for problems you may encounter when using the 
machine.
z “An Error Message Is Displayed on the LCD” on page 133
z “LCD Cannot Be Seen At All” on page 138
z “An Unintended Language Is Displayed on the LCD” on page 138
z “Cannot Install the MP Drivers” on page 139
z “Cannot Connect to Computer Properly” on page 140
z “Print Results Not Satisfactory” on page 141
z “The Print Result Not Satisfactory When Copying” on page 144
z “Printing Does Not Start” on page 145
z “Machine Moves But Ink Is Not Ejected” on page 146
z “Paper Does Not Feed Properly” on page 146
z “Paper Does Not Feed from the Paper Source Specified in the Printer Driver” on page 147
z “Paper Jams” on page 148
z “Document Jams in the ADF” on page 152
z “Message Appears on the Computer Screen” on page 156
z “Error Message Appears on a PictBridge Compliant Device” on page 159
z “Cannot Print Properly through Bluetooth Communication” on page 160
z “Cannot Print Properly from a Photo Index Sheet” on page 161
z “Cannot Remove a Memory Card” on page 161
z “Scanning Problems” on page 161
z “Problems Receiving Faxes” on page 162
z “Problems Sending Faxes” on page 165
z “Telephone Problems” on page 166
Note
This section mainly describes the methods of machine operation for troubleshooting. To handle problems 
using your computer, refer to “Troubleshooting” in the  User’s Guide on-screen manual. For details on how 
to view the on-screen manuals, see “Reading the On-screen Manuals” on page 168. 
						

							132Troubleshooting
If an Error Occurs When the Machine Is Connected to a Computer
When an error occurs in printing such as the machine is out of paper or paper is jammed, a 
troubleshooting message is displayed automatically. Take the appropriate action described in the 
message.
The message may vary depending on the version of your operating system. 
						

							
133
Troubleshooting
An Error Message Is Displayed on the LCD
If an error message is displayed on the LCD, take the corresponding action described below.
MessageAction
“The ink may have run out. Replacing 
the ink tank is recommended.”
U041 If the lamp on the ink tank is flashing, ink may have run out.
Replacing the ink tank is recommended.
If printing is in progress and you want to continue printing, press the 
OK button 
with the ink tank installed. Then printing can continue. Replacing the ink tank is 
recommended after the printing. The machine may be damaged if printing is 
continued under the ink out condition.
See “Replacing an Ink Tank” on page 107.
Notez If multiple ink lamps are flashing red, see “Getting the Ink Status Information” 
on page 107 and check the status of each ink tank.
z Since printing in this condition may cause the contents of the fax to be lost, 
the machine stores received faxes in memory without printing until the ink 
tank is replaced. Print the fax stored in memory manually after replacing the 
ink tank. You can set the machine to print received faxes forcibly without 
storing them in memory, but a part of contents or all contents of the fax may 
not be printed.
“Print head is not installed. Install the 
print head.”
U051
“The type of print head is incorrect. 
Install the correct print head.”
U052 Follow the directions given in your setup sheet to install the Print Head.
If the Print Head is already installed, remove the Print Head once and then 
reinstall it.
If the error is not resolved, the Print Head may be damaged. Contact your 
Canon service representative.
“Some ink tanks are not installed in 
place.” 
U072
“More than one ink tank of the following 
color is installed.” 
U071 Possible causes are as follows:
z
Some ink tanks are not installed in the correct position. (The lamp on the ink 
tank flashes.)
z More than one ink tanks of the same color are installed. (The lamp on the ink 
tank flashes.)
Confirm that the ink tanks are installed in the appropriate positions.
See “Replacing an Ink Tank” on page 107.
“The remaining level of the ink cannot 
be correctly detected.”
U130 The remaining ink level cannot be correctly detected. (The lamp on the ink tank 
flashes.)
Replace the ink tank and close the Scanning Unit (Printer Cover).
Printing with an ink tank that was once empty may damage the machine.
If you want to continue printing in this condition, you need to release the function 
for detecting the remaining ink level. Press and hold the 
Stop/Reset button for 
at least 5 seconds, and then release it.
With this operation, releasing the function for detecting the remaining ink level is 
memorized. Please be advised that Canon shall not be liable for any machine 
malfunction or damage caused by refilled ink tanks.
See “Replacing an Ink Tank” on page 107.
Notez If the function for detecting the remaining ink level is disabled, the ink tank in 
gray is displayed on the LCD when checking the current ink level.
See “Getting the Ink Status Information” on page 107.
z Since printing in this condition may cause the contents of the fax to be lost, 
the machine stores received faxes in memory without printing until the ink 
tank is replaced. Print the fax stored in memory manually after replacing the 
ink tank. You can set the machine to print received faxes forcibly without 
storing them in memory, but a part of contents or all contents of the fax may 
not be printed. 
						

							
134Troubleshooting
“The following ink tank cannot be 
recognized.”
U043
U140
U150 z
The ink tank is not installed.
Install the ink tank.
See “Replacing an Ink Tank” on page 107.
z The ink tank is not compatible with this machine. (The lamp on the ink tank is 
off.)
Install an appropriate ink tank.
See “Replacing an Ink Tank” on page 107.
z An Ink tank error has occurred. (The lamp on the ink tank is off.)
Replace the ink tank.
See “Replacing an Ink Tank” on page 107.
“The ink has run out. Replace the ink 
tank.”
U163 Ink has run out. (The lamp on the ink tank flashes.)
Replace the ink tank and close the Scanning Unit (Printer Cover).
Printing under the current condition may damage the machine.
If you want to continue printing in this condition, you need to release the function 
for detecting the remaining ink level. Press and hold the 
Stop/Reset button for 
at least 5 seconds, and then release it.
With this operation, releasing the function for detecting the remaining ink level is 
memorized. Please be advised that Canon shall not be liable for any 
malfunction or trouble which may be caused by continuation of printing under 
the ink out condition.
See “Replacing an Ink Tank” on page 107.
Notez If the function for detecting the remaining ink level is disabled, the ink tank in 
gray is displayed on the LCD when checking the current ink level.
See “Getting the Ink Status Information” on page 107.
z Since printing in this condition may cause the contents of the fax to be lost, 
the machine stores received faxes in memory without printing until the ink 
tank is replaced. Print the fax stored in memory manually after replacing the 
ink tank. You can set the machine to print received faxes forcibly without 
storing them in memory, but a part of contents or all contents of the fax may 
not be printed.
“There is no photo data.” zThere are no image data saved on the memory card that can be read by this 
machine.
z The machine may not recognize the file if the file name or the folder path 
contains certain characters. Use only alphanumeric characters.
z Photo data edited or processed on a computer must be printed from the 
computer.
“The card is currently write-enabled. 
Remove card and set to read-only 
mode before performing operation.” The Card Slot is set to 
USB enabled or LAN enabled .
You cannot print when the Card Slot is set to  USB enabled or LAN enabled .
After writing on the memory card, set to  Read-only mode again.
“Inner cover is open. Close the inner 
cover and press OK.” If the Inner Cover is open when starting printing, close it and then press the 
OK 
button on the machine.
Do not open or close the Inner Cover while printing, as this can damage the 
machine.
“The ink absorber is almost full. Press 
OK to continue printing. Contact the 
service center.” The machine has a built-in ink absorber to hold the ink used during Print Head 
Cleaning, for example.
This error message indicates that the ink absorber is nearly full.
Press the 
OK button to cancel the error so you can continue printing.
However, because printing is disabled once the ink absorber becomes 
completely full and until the ink absorber is replaced, you are recommended to 
contact your Canon service representative as early as possible. (You will need 
to replace a particular part of the machine.)
MessageAction 
						

							
135
Troubleshooting
“Auto head align has failed. Press OK 
and repeat operation. ” Possible causes are as follows:
z
Print Head nozzles are clogged. 
Press the  OK button to dismiss the error message, and print the nozzle 
check pattern to check the status of the Print Head. See “Printing the Nozzle 
Check Pattern” on page 115 and “Printing Does Not Start/Printing Is Blurred/
Colors Are Wrong/Straight Lines Are Misaligned” on page 142.
z Paper of size other than A4 or Letter is loaded in the Rear Tray.
Press the  OK button on the machine to dismiss the error message, then load 
two sheets of A4/Letter-sized paper (MP-101) in the Rear Tray.
Automatic Print Head Alignment cannot be performed using paper from the 
Cassette. For Automatic Print Head Alignment, always load paper in the 
Rear Tray.
z The Paper Output Slot is exposed to strong light.
Press the  OK button to dismiss the error message, and then adjust your 
operating environment and/or the position of the machine so that the Paper 
Output Slot is not exposed directly to strong light.
After carrying out the above measures, if the problem continues after aligning 
the Print Head again, press the  OK button to dismiss the error message, and 
then perform Manual Print Head Alignment. For details on Manual Print Head 
Alignment, see “Manual Print Head Alignment” on page 120.
“****
Error code” “****” is an alphanumeric code that varies according to the error status.
z
When “5100” or “5110” is displayed  
(1) Turn off the machine, and lift the Scanning Unit (Printer Cover) to check if 
there are any foreign objects inside the machine.
(2) Move the Print Head Holder (the part that holds the ink tanks) to the right side 
gently by hand if you can move it manually. Make sure that the ink tanks are 
securely set in the Print Head Holder.
(3) Turn on the machine.
If the same error occurs, follow the instruction in “When other codes are 
displayed” described below.
z When other codes are displayed  
Turn off the machine, and unplug the power cord of the machine from the 
power supply. After five minutes or more, plug the power cord of the machine 
back in, and then turn on the machine. If the same error occurs, contact your 
Canon service representative.
“Scanner is not operating correctly.” Turn off the machine, and unplug the power cord of the machine from the power  supply. After five minutes or more, plug the power cord of the machine back in, 
and then turn on the machine. If the same error occurs, contact your Canon 
service representative.
“Incompatible device detected. 
Remove the device.” z
A communication time out occurs if an operation takes too long or if it takes 
too much time to send data. This may cancel printing. In such cases, 
disconnect and reconnect the USB cable.
When printing from a PictBridge compliant device, depending on the model 
or brand of your device, you may have to select a PictBridge compliant print 
mode on the device before connecting it to the machine. You may also have 
to turn on your device or select Play mode manually after connecting the 
device to the machine. Perform necessary operations before connecting your 
device referring to its instruction manual. 
If the error is still not resolved, check if you can print another photograph.
z Check your device connected to the machine. Only PictBridge compliant 
devices or the optional Bluetooth Unit BU-30 can be connected to the 
machine for direct printing. If a PictBridge compliant device is connected via 
a USB hub, remove the hub and connect it directly to the machine.
“An unsupported USB hub is 
connected. Remove the hub.” If a PictBridge compliant device is connected via a USB hub, remove the hub 
and connect it directly to the machine.
“Document in ADF. Redo operation 
after checking document in ADF and 
pressing OK.” The document is jammed in the ADF. Remove the document page jammed in 
the ADF, then press the 
OK button. When the error is cleared, redo the 
operation. See “Document Jams in the ADF” on page 152.
MessageAction 
						

							
136Troubleshooting
“Document size is too long. Redo 
operation after checking document on 
ADF and pressing OK.” The document is too long or is jammed in the ADF. Remove the document page 
jammed in the ADF, then press the 
OK button. When the error is cleared, make 
sure that the document you are loading meets the machine’s requirements 
before redoing the operation. See “Original Document Requirements” on 
page 16 and “Document Jams in the ADF” on page 152.
“Document size not suitable for two-
sided scanning. Press OK to cancel 
operation and discharge document.” Two-sided scanning can be used only for A4 or Letter-sized documents. Press 
the 
OK button to discharge the document, and rescan the document one side at 
a time.
“This paper is not compatible with 
duplex printing. Remove the paper and 
press OK.” The 
Page size  or Paper size  setting in the printer driver is not compatible with 
automatic duplex printing. Make sure that the paper size suitable for automatic 
duplex printing is specified. The sizes of media suitable for automatic duplex 
printing are A4, Letter, A5, B5, and 5 x 7.
Load the paper of suitable size, then press the  OK button on the machine.
“Auto redial” The machine is waiting to redial the recipient’s number because the line was  busy or the recipient did not answer when you tried to send a document. Wait for 
the machine to automatically redial the number. If you want to cancel automatic 
redialing, wait until the machine starts dialing the number, then press the  Stop/
Reset  button. You can also delete the document from memory. See “Document 
Stored in Memory” on page 99.
“This group dial cannot be used.
Coded dial ##” You selected a coded speed dial code in which a group is registered with the 
Hook
 button pressed.
In this way, a coded speed dial code in which a group is registered cannot be 
used.
* “##” represents a two-digit number. 
“This group dial cannot be used.
One-touch ##” You pressed a 
One-touch Speed Dial  button in which a group is registered with 
the  Hook  button pressed.
In this way, a  One-touch Speed Dial  button in which a group is registered 
cannot be used.
* “##” represents a two-digit number. 
“Hang up the phone.” The handset is not placed in the handset cradle correctly. Replace the handset  correctly.
“Try again in black & white.” The recipient’s fax machine is not color-compatible. Press the  Black button to 
resend the faxes. Alternatively, you can set  Color TX to Send in black & white . 
Refer to “Color TX” in “Device Settings” of the  User’s Guide on-screen manual.
“Failed to connect.” The telephone line cable with a modular plug is not plugged in properly, or  Dial 
tone detect  is set to ON. Make sure that the cable is plugged in properly, and 
resend the fax after a while. If you still cannot send the fax, set  Dial tone detect 
to  OFF . Refer to “Dial tone detect” in “Device Settings” of the  User’s Guide on-
screen manual.
MessageAction