Service manual

2-14
Confidential
<Life of Drum Unit>
The life of the drum unit is judged the value of either large one of “Drum Counter” of “Number
of rotations of exposure drum”.
The drum counter is based on the number of pages actually printed for every drum unit.
Whenever it replace for a new drum unit, it is necessary to reset this number of sheets. (See
the below)
However, if the situation of performing OFF/ON of power switch frequently and there is little
printing number of sheets per 1, not “Drum Counter” by the printing number of sheets, the
number of rotations of exposure drum exceeds it so that only the number of rotations of the
exposure drum increases, and the life of drum unit may be reached. (See the below)
Relationship between average print page per 1 job and life of drum unit
26/27ppm model
24ppm model
The exposure drum also rotates for the warm-up operation when the power is turned ON and
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
26/27ppm model
24ppm model
The numeral values provided in this page are as of June 2010. These values are subject to
change without prior notice.
<How to reset the drum counter>
Reset the drum counter in accordance with "2.2 Parts Life Reset Function" in Chapter 5.
Average print page (page/job) 1 2 3 · · · Continuance
Drum unit 12000 18000 22000 40000
Page
Average print page (page/job) 1 2 3 · · ·
Continuance
Drum unit 12000 18000 22000 39000
Page
Average print page (page/job) 1 2 3 · · ·
Continuance
Drum unit 7000 12000 16000 40000
Page
Average print page (page/job) 1 2 3 · · ·
Continuance
Drum unit 7000 12000 15000 39000
Page