Conditions outside the specification limits should be avoided, and consequential problems may be excluded from the maintenance contract on a machine.
Paper is very sensitive to changes in humidity.
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High humidity in the paper can cause: |
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paper jams due to lower stiffness |
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weak images or random deletions due to reduced ability to retain an electrostatic charge. |
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poor toner adhesion or fusing |
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cockled appearance due to uneven drying in the fusing unit |
Moving paper from a cold storage area to a warm print-room can also cause some of the humidity in the air to condense onto the paper and so increase its moisture content. Paper should always be allowed to stabilise for some hours in the print-room environment before opening the wrapping. Paper should not be stored directly on the floor of any storage area which might be cold or subject to damp or condensation.
Within the machine, high ambient temperatures or humidity can cause a number of failures in the imaging system, the toner powder itself or the mechanism and control systems.
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Low humidity can cause a build-up of a static charge on the paper, resulting in |
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Misfeeding or double-sheet feeding |
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Excessive jam rate, especially on side 2 |
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Uneven stacking in the finisher unit or output tray |
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Slight spark when retrieving copies from the output tray |
Paper should not be stored near to sources of heat, such as radiators, or hot surfaces such as heating pipes. |
