Cause:

Curled sheets can cause strong friction at their leading edges. This may result in paper misfeeds. Sheets will not be ejected completely and the trailing edges will be left inside the paper exit. If this happens, other sheets may slip under the delivered sheets, so that the delivered sheets may be curled when loaded.

[A]

Concave curl. Paper exits with curve down.

[B]

Convex curl. Paper exits with curve up.

Here is a detailed description of how this problem can occur.

  1. An uncurled sheet is delivered to the stacker shift tray.
  2. Strong friction occurs at the trailing edge so that the paddle cannot pull the sheet back and align the edges of the sheet with those of the stack.
  3. The paper edge stopper fails to push back the protruding leading edge and align the sheet as required.
  4. Stacked sheets are not aligned properly.
Not Using Decurl Unit Option

Remove the stack, turn it upside down, load it in the tray again, and then adjust the fusing temperature.

Note 1

  • Problem cannot be resolved. If the problem occurs on only the first sheet, print a blank sheet as the first sheet, and if the problem occurs on the last sheet, print a blank sheet as the last sheet.
Using the Decurl Option

Follow this procedure to correct paper curl with the Decurl Unit.

  1. Using coated paper?

    Yes

    In the [Adjustment Settings for Skilled Operators] menu, set 0310: [Adjust Paper Curl] to [Adjust Curl: Weak].

    Go to next step.

    No

    Go to next step 7.

  2. Print the image. Problem solved?

    Yes

    Finished!

    No

    Go to next step.

  3. Set 0310: [Adjust Paper Curl] to [Adjust Curl: Strong].

  4. Print the image. Problem solved?

    Yes

    Finished!

    No

    Go to next step.

  5. Convex curl within specification?

    Yes

    The problem cannot be corrected in the field.

    No

    Go to next step.

  6. Turn the stack upside down, and go to step 3 again. If the amount of curl exceeds specification, do SP1984-101 to 131 to lower fusing temperature by 5°C to 10°C to reduce the amount of curl. You can also use the Custom Paper Settings > 44: [Fusing Heat Roller Temperature Adj.] to adjust the fusing temperature.

  7. Convex curl with Plain Paper?

    Yes

    In the [Adjustment Settings for Skilled Operators] menu, set 0310: [Adjust Paper Curl] to [Adjust Curl: Weak].

    Go to next step.

    No

    The problem cannot be corrected in the field.

  8. Print the image. Problem solved??

    Yes

    Finished!

    No

    Go to next step.

  9. Set 0310: [Adjust Paper Curl] to [Adjust Curl: Strong].

  10. Print the image. Problem solved??

    Yes

    Finished!

    No

    Go to next step.

  11. Convex curl within specification?

    Yes

    The problem cannot be corrected in the field.

    No

    Go to next step.

  12. Turn the stack upside down, and go to step 9 again. If the amount of curl exceeds specification, do SP1984-101 to 131 to lower fusing temperature by 5°C to 10°C to reduce the amount of curl. You can also use the Custom Paper Settings > 44: [Fusing Heat Roller Temperature Adj.] to adjust the fusing temperature.