Canon imageRUNNER 2520 Series, Service Manual, Page: 201 / 402

■ Image Deletion/Blur/Dew Condensation
[Occurrence area]
Drum (circumference: 94mm)
[Cause]
Corona products generated on the charging roller stick to the drum, and then water molecules adsorb onto them, resulting in
reduction in resistance.
Therefore, a desired latent image cannot be formed, resulting in a blurred image.
[Occurrence condition]
When the machine is operated first in the morning under the high-temperature and highhumidity environment.
[Remedy]
USER MODE> Adjustment/ Cleaning> Special Mode F> Low, Meduium, or High Install the optional drum heater.
■ Too Large Curl
[Occurrence area]
Fixing assembly
[Cause]
The water content on the front surface of paper becomes different from that on the reverse side of paper, making the curl larger.
[Occurrence condition]
When the paper has been left alone in a high-humidity environment.
[Remedy]
USER MODE> Adjustment/ Cleaning> Manual> Special Mode N> Medium or High
*Normally, select "Low". Selecting "High" will reduce productivity.
Machine shipped with cassette heater: Turn on the heater.
Install an optional cassette heater.
■ Paper Jam due to Solid Image Printed on Paper with Small Leading-Edge
Margin (1-4 mm)
[Occurrence area]
Fixing assembly
[Cause]
When a solid image is printed on the paper with a small leading-edge margin (1-4 mm), paper cannot be easily separated from
the fixing film, causing a paper jam.
[Occurrence condition]
When the paper has been left alone in a high-humidity environment or when a solid image is printed on the paper with a small
leading-edge margin.
6. Troubleshooting
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