Canon Satera LBP3900 User Manual page 51

If paper is torn, be sure to find and remove any remaining pieces of paper.
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The error message may remain if jammed paper is removed without opening the front
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cover. In this case, open and close the front cover once.
Do not touch the high-voltage contact (A) or the electrical contact (B) shown in the figure,
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as this may result in damage to the printer.
(A)
Do not touch the transfer roller (C), as this may result in deterioration in print quality.
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(B)
(C)