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imageCLASS LBP843Cx
imageCLASS LBP843Cx Support
FAQs & troubleshooting

Unevenness/Smudge Marks Appear

Content Id: 8203020400


Printing Is Uneven

⋖Cause 1⋗

Paper is too moist or too dry.

⋖Solution⋗

Replace the paper with new paper in an unopened package. For details on paper which requires attention before use, see the "User's Guide" from the Canon website(canon.com/oip-manual).

⋖Cause 2⋗

The toner cartridge has run out of toner, has deteriorated, or is damaged.

⋖Solution⋗

Check the status of the toner cartridge, and replace the color toner cartridges that is almost empty with a new one. For more details, see the "User's Guide" from the Canon website(canon.com/oip-manual).

⋖Cause 3⋗

The drum in any of the toner cartridges has deteriorated.

⋖Solution⋗

Replace the toner cartridge with a new one. For details on replacing the toner cartridge, see the "User's Guide" from the Canon website(canon.com/oip-manual).

The Back of the Printed Paper Has Smudge Marks

⋖Cause⋗

The size of the print data was larger than that of the loaded paper.

⋖Solution⋗

Check if the size of the print data matches that of the loaded paper.

Printed Pages Have White Specks

⋖Cause 1⋗

Appropriate paper is not being used.

⋖Solution⋗

Replace the paper with that which can be used with this printer. [ Usable Paper ]

⋖Cause 2⋗

Damp paper is used.

⋖Solution⋗

Replace the paper with new paper in an unopened package. For details on the paper which requires attention before use, see the "User's Guide" from the Canon website(canon.com/oip-manual).

⋖Cause 3⋗

The drum in the toner cartridge is deteriorated.

⋖Solution⋗

Replace the toner cartridge with a new one. For details on the procedure for replacing the toner cartridge, see the "User's Guide" from the Canon website(canon.com/oip-manual).

Colors are Uneven or Not Printed Smoothly

⋖Cause⋗

Data with large-size text, bold lines, and graphics with intense colors was printed

⋖Solution⋗

Perform the following in the printer driver.

1. Display the [Finishing] tab.

2. Click [Advanced Settings].

3. Select an appropriate mode in [Special Smoothing Mode].

Usually set [Special Smoothing Mode] to [Mode 1].

If any of the following symptoms occur after specifying [Mode 1] for this setting, try

specifying one of [Mode 2] to [Mode 6] and print again.

Intensely-colored graphics, large-sized text, and inside bold lines are not printed smoothly

→Specify [Mode 2].

The following symptoms occur at the same time

Intensely-colored graphics, large-sized text, and inside bold lines are not printed smoothly

Less intensely-colored graphics, text, and the area around lines are not printed smoothly

Text and lines on a colored background are not printed smoothly

→Specify [Mode 3].

Less intensely-colored graphics, text, and the area around lines are not printed smoothly

→Specify [Mode 4].

Colors are printed unevenly in bands in images (photo images), graphics, gradations, and shading patterns

→Specify [Mode 5].

Printing is not smooth overall

→Specify [Mode 6].

Caution

When specifying a [Special Smoothing Mode]

If [Mode 2] or [Mode 4] is specified, colors may be printed unevenly in portions with less intense colors.
If [Mode 3] is specified, colors may be printed unevenly in portions with less intense colors or in shading patterns.
If [Mode 5] is specified, text and the area around lines and graphics may not be printed smoothly.
If [Mode 6] is set, colors may not be printed smoothly.

You can specify the same setting from the printer's control panel. For more details, see the "User's Guide" from the Canon website(canon.com/oip-manual).

Residual Images Appear on Non-printed Areas

⋖Cause 1⋗

Appropriate paper is not being used.

⋖Solution⋗

Replace the paper with that which can be used with this printer. [ Usable Paper ]

⋖Cause 2⋗

Paper with wider width was printed just after paper with narrower width (A5 size etc.) was printed continuously.

⋖Solution⋗

To lower the temperature of the fixing unit, wait for a while before printing again.

⋖Cause 3⋗

The drum in any of the toner cartridges has deteriorated.

⋖Solution⋗

Replace the toner cartridge with a new one. For details on the procedure for replacing the toner cartridge, see the "User's Guide" from the Canon website(canon.com/oip-manual).

The Overall Print Result Is Dark

⋖Cause 1⋗

The setting for [Toner Density] is not appropriate.

⋖Solution⋗

Perform the following procedure in the printer driver.

1. Display the [Quality] tab.

2. Click [Advanced Settings].

3. Adjust [Toner Density].

You can specify the same setting from the printer's control panel.

For more details, see the "User's Guide" from the Canon website(canon.com/oip-manual).

⋖Cause 2⋗

The printer is exposed to direct sunlight or strong light.

⋖Solution⋗

Move the printer.

The Toner Does Not Fix onto the Paper Well

⋖Cause 1⋗

The setting for [Paper Type] is not specified properly.

⋖Solution⋗

Specify [Paper Type] properly. For details on the procedure for specifying the setting for the paper type, see the "User's Guide" from the Canon website(canon.com/oip-manual).

⋖Cause 2⋗

Appropriate paper is not being used.

⋖Solution⋗

Replace the paper with that which can be used with this printer. [ Usable Paper ]

⋖Cause 3⋗

Toner may not fix onto paper completely depending on the paper type.

⋖Solution⋗

Perform the following procedure in the printer driver.

UFR II Printer Driver

1. Display the [Quality] tab.

2. Click [Advanced Settings].

3. Set [Gray Compensation] to [On].

PCL Printer Driver

See Help of the PCL/PS printer driver.

You can specify the same setting from the printer's control panel.

For more details, see the "User's Guide" from the Canon website(canon.com/oip-manual).

⋖Cause 4⋗

Toner on the parts dense in color does not fix onto the paper.

⋖Solution⋗

Set [Special Image Mode] to [Level 1].

If the problem still persists, set it to [Level 2].

For more details, see the "User's Guide" from the Canon website(canon.com/oip-manual).

* Normally, set [Special Image Mode] to [Off]. Do not set [Level 1] or [Level 2] unless the problems described above occur.

* If [Special Image Mode] is set to [Level 1] or [Level 2], the print density may be lower than if it was set to [Off].

⋖Cause 5⋗

A problem is occurring inside the printer.

⋖Solution⋗

If ⋖Ennn-nnnn⋗ appears in the display, follow the procedure in "The Message Indicator Is On" in the "User's Guide" from the Canon website(http://canon.com/oip-manual) to solve the problem.

Smudge Marks of Spattering Toner Appear around the Text or Patterns

⋖Cause⋗

Appropriate paper is not being used.

⋖Solution⋗

Replace the paper with that which can be used with this printer. [ Usable Paper ]

White Dust Is Attached to the Printed Transparencies

⋖Cause⋗

You print transparencies after printing paper other than transparency continuously.

⋖Solution⋗

Wipe and remove the chipped paper with a soft cloth.

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