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Brother DCP-7090 Service Manual page 48

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(2) Use the numbered markers next to the drum roller to find the mark on the drum. For
example, a dot in column 2 on the check sheet means that there is a mark in drum
region "2".
(3) Turn the edge of the drum unit towards you while looking at the drum surface to find the
mark.
(4) Wipe the surface of the drum gently with a dry cotton swab until the mark or foreign
material on the surface comes off.
Note:
Do not clean the exposure drum surface with anything sharp like a ball pointed pen.
Fig. 2-21
Fig. 2-22
Fig. 2-23

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