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parts, adding lubricant.
6.1 Clean the sensor
As the following photos, please clean the red circled sensor when needed.
6.2 Clean the rollers
Dust or ink from paper might stick on rollers that reduce the friction of the
rollers and make error, for example: crease line is out of tolerance; or folding
line is not on crease line.
Therefore, please clean the rollers if needed.