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Depending on the cause of the problem, do one of the following:
Is the paper feed roller covered with paper dust?
Paper dust may decrease the traction of the paper feed roller and result in double feeding due to paper slippage or insufficient separation.
Cleaning the paper feed roller will restore traction and so prevent double feeding.
For details about cleaning the paper feed roller, see Cleaning the Paper Feed Path.
For details about removing the paper feed roller, see Replacement Guide.
The two-tray wide LCT does not have paper feed rollers.
Have you ruffled the paper sufficiently?
Double feeding may result if the paper is not ruffled properly.
Remove the paper, ruffle it, and reload it.
For details about ruffling the paper, see "Fanning the paper", Preparation.
The paper is curled.
Double feeding may occur if the paper is curled.
Type of curl
Face curl: The set paper is warped upward.
Back curl: The set paper is warped downward.
Measurement of curl
Load one sheet of paper on a flat surface, apply the scale to the leading edge of the paper, and measure the curl at the four edges. The maximum value is the curl value.
Curl standard
Acceptable curl amount varies depending on the basic weight of the paper.
Paper weight |
Curl amount |
|---|---|
Paper Weight 0 - 6 |
Face curl: 10 mm Back curl: 10 mm |
Paper Weight 7 |
Face curl: 10 mm Back curl: 5 mm |
Paper Weight 8 |
Face curl: 10 mm Back curl: 3 mm |
Paper Weight 9 |
Face curl: 10 mm Back curl: 0 mm |
Correcting curl
Place the curled surface down on a flat surface.
Hold the end of the paper and straighten it in the opposite direction to the curl direction so that the paper is rounded.
If the separation pressure level has been adjusted
For any of trays 1 to 3, if the separation pressure adjuster has been changed to a non-default separation pressure, double feeding may occur, depending on the paper type used.
Double feeding can be prevented by changing the separation pressure level back to the default position.
Is the Pickup Assist setting enabled?
If the Pickup Assist function operates too much, it may cause double feeding with coated paper.
By disabling the Pickup Assist setting, you can prevent double feeding.
The two-tray wide LCT does not have the Pickup Assist function.
<If custom paper is used>
Select [Machine: Paper Feed / Output] in [Advanced Settings] for the custom paper in use, select 1321: [Main/3-Tray LCIT/Bypass] and set [Pickup Assist] to [Off].
<If custom paper is not used>
In the [Main Unit: Paper Feed/ Output] group on the [Adjustment Settings for Operators] menu, set 03089: [Pickup Assist Setting] to [Off].
Special or coated paper is used.
Is the airflow strong enough?
The factory-set airflow of the three-tray wide LCT may not be strong enough to separate the sheets. Increase the airflow.
<If custom paper is used>
Select [Machine: Paper Feed / Output] in [Advanced Settings] for the custom paper in use, select 1301: [3-Tray LCIT] and increase the value in [Fan Level].
<If custom paper is not used>
In the [Main Unit: Paper Feed/ Output] group on the [Adjustment Settings for Operators] menu, increase the value in 0306: [Wide LCT: Fan Level].
Is the tab fence attached?
By attaching the tab fence, you can prevent air from leaking at the trailing edge of the paper and improve separation.
For details about attaching the tab fence, see "Preparation" supplied with the machine.
Two-tray wide LCT is used.
The factory-set airflow of the wide LCT may not be strong enough to separate the sheets.
Increase the airflow.
Select [Machine: Paper Feed / Output] in [Advanced Settings] for the custom paper you are using, select 1311: [2-Tray LCIT] and set [Paper Feed Mode:Fan Level] to [Prevent Double Feed (Weaker Blow)].
If the problem persists, set [Paper Feed Mode:Fan Level] to [Prevent Double Feed (Weakest Blow)].
If the problem persists, select 1311: [2-Tray LCIT] and increase the value in [Blower Fan Level] by 10%.
If the problem persists, increase the value an additional 10% in [Blower Fan Level].
