Canon MF720 Series Service Manual

Canon MF720 Series Service Manual

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Revision 2.0
MF720 Series
Service Manual

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Thomas R O'Neil
April 28, 2025

how do you fix cyan lines and dotd on print out when automatic maintenance does not work

1 comments:
Mr. Anderson
May 15, 2025

To fix cyan lines and dots on prints for the Canon MF720 Series when automatic maintenance does not work, follow these manual steps:

1. Clean relevant parts manually:
- Use lint-free paper to clean key components that may affect print quality:
- Fixing front guide
- Laser beam window glass
- Multi-purpose tray separation pad, pickup roller, and feed roller
- Cassette pickup roller and separation roller
- Registration upper guide
- For heavy soil, use alcohol with lint-free paper.

2. Check and adjust the white level settings:
- Enter service mode and adjust white level settings:
- COPIER > FUNCTION > CCD > DF-WLVL1 (book mode)
- COPIER > FUNCTION > CCD > DF-WLVL2 (ADF mode)
- Adjust shading target values in:
- COPIER > ADJUST > CCD > DFTAR-R (set to "299")
- COPIER > ADJUST > CCD > DFTAR-G
- COPIER > ADJUST > CCD > DFTAR-B (set to "309")
- If adjustment fails, turn the power OFF and ON, then repeat the process.

These steps help remove contaminants and recalibrate imaging sensors, which can correct cyan lines and dots.

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