Brother FAX-2840 Service Manual page 50

<Life of Drum Unit>
The end of life of the drum unit is determined based on the "drum counter" or the "number of
drum rotations", whichever is larger. Printing does not stop even when the drum unit reaches
the end of life.
The drum counter is based on the total printed pages on each drum unit. The drum counter
should be reset every time you replace the drum unit with a new one.
(Refer to <How to reset the drum counter> below.)
However, if the power switch is turned OFF/ON frequently or if you print few pages per job,
only the number of drum rotations increases. Then, the number of drum rotation exceeds the
"drum counter" based on the total printed pages and the drum unit may reach the end of life.
Relationship between average printable pages per job and life of drum unit
Average pages printed (page/job)
Drum unit
Drum rotations are required for the warm-up operation when the power is turned ON or when
the cover is opened or closed. Therefore, when these operations are frequently performed,
the life of drum unit is shortened. (The table below shows the worst case in which the warm-
up operation is performed when the power is turned ON.)
Life of the drum unit in the case that the power is turned OFF/ON for every print job
Average pages printed (page/job)
Drum unit
The numeral values provided on this page are current as of April 2012. These values are
subject to change without notice.
<How to reset the drum counter>
Reset the drum counter in accordance with
1 2 3
12000 18000 22000
1 2 3
7000 12000 16000
"2.2 Parts Life Reset Function (Drum)" in Chapter
2-13
• • • Continuance
40000
Page
• • • Continuance
40000
Page
Confidential
5.