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PIXMA MX420 Support
FAQ and troubleshooting

Writing Error/Output Error/Communication Error (Windows)

Content Id: 8201023300


Issue

Cause and solution

Check 1: If all the lamps on the Operation Panel are off, make sure that the power cord is plugged in, then turn the machine on

While any lamp on the Operation Panel is flashing, the machine is initializing. Wait until the lamp on the Operation Panel stops flashing and remains lit.

Cause and solution

Check 2: Make sure that the printer port is configured appropriately in the printer driver

* In the following instructions, "XXX" signifies your machine's name.

1. Log on as a user account with administrator privilege.

2. Select items from the [ Start ] menu as shown below.

In Windows 7, select [ Devices and Printers ] from the [ Start ] menu.
In Windows Vista, select the [ Start ] menu ⋗ [ Control Panel ] ⋗ [ Hardware and Sound ] ⋗ [ Printers ].
In Windows XP, select the [ Start ] menu ⋗ [ Control Panel ] ⋗ [ Printers and Other Hardware ] ⋗ [ Printers and Faxes ].

3. Open the properties of printer driver for the machine.

In Windows 7, right-click the "Canon XXX Printer" icon (where "XXX" is your machine's name), then select [ Printer properties ].
In Windows Vista or Windows XP, right-click the "Canon XXX Printer" icon (where "XXX" is your machine's name), then select [ Properties ].

4. Click the Ports tab to confirm the port settings.

Make sure that a port named "USBnnn" (where "n" is a number) with "Canon XXX Printer" appearing in the [ Printer ] column is selected for [ Print to the following port(s) ].

Caution

When the machine is used over LAN, the port name of the machine is displayed as "CNBJNP_xxxxxxxxxx".

* "xxxxxxxxxx" is the character string generated from the MAC address or a character string specified by the user when setting up the machine.

Cause and solution

If the setting is incorrect:

Reinstall the MP Drivers.

Printing does not start even though the machine is connected to the computer using a USB cable and the port named "USBnnn" is selected:

Launch [ Canon My Printer ] from the task tray, select [ Diagnose and Repair Printer ]. Follow the on-screen instructions to set the correct printer port, then select your machine's name.

If the problem is not resolved, reinstall the MP Drivers.

Printing does not start even though the port named "CNBJNP_xxxxxxxxxx" is selected when the machine is used over LAN:

Launch IJ Network Tool, and select "CNBJNP_xxxxxxxxxx" as you confirmed in step 4, then associate the port with the printer using [ Associate Port ] in the [ Settings ] menu.

If the problem is not resolved, reinstall the MP Drivers.

Cause and solution

Check 3: Make sure that the machine is connected to your computer properly

When the machine is connected to your computer with a USB cable, make sure that the USB cable is securely plugged in to the machine and the computer, then check the followings:

If you are using a relay device such as a USB hub, disconnect it, connect the machine directly to the computer, and try printing again. If printing starts normally, there is a problem with the relay device. Consult the reseller of the relay device for details.
There could also be a problem with the USB cable. Replace the USB cable and try printing again.

When you use the machine over LAN, make sure that the machine is connected to the network with a LAN cable or is set up correctly. For details, refer to your setup manual.

Cause and solution

Check 4: Make sure that the MP Drivers are installed correctly

Uninstall the MP Drivers following the procedure described in [ Deleting the Unnecessary MP Drivers ] , insert the Setup CD-ROM into the computer's disc drive and perform [ Custom Install ] and select [ MP Drivers ] to install again.

Cause and solution

Check 5: When the machine is connected to your computer with a USB cable, check the status of the device on your computer

Follow the procedure below to check the status of the device.

1. Open the Device Manager on your computer as shown below.

If the [ User Account Control ] screen is displayed, follow the on-screen instructions.

In Windows 7 or Windows Vista, click [ Control Panel ], [ Hardware and Sound ], then [ Devices Manager ].
In Windows XP, click [ Control Panel ], [ Performance and Maintenance ], [ System ], then click [ Device Manager ] on the [ Hardware ] sheet.

2. Double-click Universal Serial Bus controllers then [ USB Printing Support ].

If the [ USB Printing Support Properties ] screen is not displayed, make sure that the machine is correctly connected to the computer.

-⋗ [ Check 3: Make sure that the machine is connected to your computer properly ]

3. Click the [ General ] tab and make sure that there is no indication of a problem with the device.

If a device error is displayed, refer to Windows help to resolve the error.

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