Canon NP6251 Service Manual page 554

4) Turn the magnet roller clockwise (viewing it from the front).
5) When the area cleaned in step 3) has taken on a new coating, repeat steps 3)
through 5).
COPYRIGHT © 1997 CANON INC.
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CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
11-23