Brother HL-2250DN Service Manual page 157

<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 sheets 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
Average print page (page/job)
Drum unit
24ppm model
Average print page (page/job)
Drum unit
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
Average print page (page/job)
Drum unit
24ppm model
Average print page (page/job)
Drum unit
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>
(1) Open the front cover, and press the [Go] button for over 4 seconds. Make sure
that all LEDs light up.
(2) Release the [Go] button, and then make sure that all LEDs light off.
(3) Close the front cover, and press the [Go] button three times. Print the Printer
Settings, and then check whether the drum counter is reset or not.
1 2
12000 18000 22000
1 2
12000 18000 22000
1 2
7000 12000 16000
1 2
7000 12000 15000
5-18
3 · · · Continuance
40000
Page
3 · · · Continuance
39000
Page
3 · · · Continuance
40000
Page
3 · · · Continuance
39000
Page
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