Cause:

During back-curl correction, the paper is compressed in the nip of the sponge roller [A] above and the decurl roller [B], so the sponger roller can press down to correct paper curl. If the image on the paper [C] is facing up when the sponge roller presses down, this can cause toner from the image to detach and foul the anti-static brush which then transfers this loose toner to the leading edge of each sheet.

This can occur when:

  • Decurl unit is connected
  • Poor stacking, and back-curl correction in effect
  • Image on the paper is facing up

Solution:

  1. Is it possible to disable back-curl correction?

    Yes

    Disable back-curl correction. Adjustment Settings for Skilled Operators > Main: Paper Feed/Exit Adjustment > Paper Curl Correction > Off. (SP 1-906-001 to 007: De-curler Setting Tray <number> :Paper Path Selection)

    No

    Go to Step 2.

  2. Determine if the paper can be output with the image side facing down.

    Yes

    Invert the paper for output. On the operation panel, set the paper to exit the main machine face down

    No

    Go to Step 3.

  3. Remove the anti-static brush. Is the problem resolved?

    Yes

    Finished!

    No

    Consult product specialist.

  • Removal of the anti-static brush before the stapling unit can affect the accuracy of stapling, so the number of sheets shunted to the pre-stacker of the finisher must be reduced. Reducing the number of sheets sent to the pre-stacker before stapling will slow down the line, so be sure to consult the product specialist before you do this with SP 6-225-001 to 014: Adj Pre Stack Number (size) (<SEF or LEF>.