Brother DCP-9045CDN, Service Manual

Page: 97 / 491

Confidential 2-3
Life of Belt Unit
The belt unit life is decided according to the page counter based on the actual “number of
belt rotations”.
<How to calculate the page counter>
The page counter based on the number of belt rotations is calculated as follows:
Page counter based on the number of belt rotations = (Number of belt rotations for the first
page p (Number of belt rotations per one page for the second or later page printed
x (Number of pages in continuous printing –1))) / 1.25
The number of belt rotations for the first page printed is 3.6.
The number of belt rotations per one page for the second or later page printed is 0.63.
The number of belt rotations per one page in printing five pages continuously is 1.25.
Example: Starts to print when the machine is in the ready state.
Continuous printing Page counter based on the number of belt rotations (Pages)
1 page/job (3.6 + (0.63 x (1 - 1))) / 1.25 = 2.88
2 pages/job (3.6 + (0.63 x (2 - 1))) / 1.25 = 3.38
18 pages/job (3.6 + (0.63 x (18 - 1))) / 1.25 = 11.45
If you leave the machine without printing for a long time, the number of belt rotations is
increasing because the developing bias voltage correction and the color registration are
performed. If you print one page per one job every time after leaving the machine without
printing for a long time, the belt unit life is shorter than usual.
The number of belt rotations required for the developing bias voltage correction = 5.3
rotations.
Example: Performs the developing bias voltage correction and starts to print after leaving
the machine without printing for a long time.
Continuous printing Page counter based on the number of belt rotations (Pages)
1 page/job (5.3 + 3.6 + (0.63 x (1 - 1))) / 1.25 = 7.12
2 pages/job (5.3 + 3.6 + (0.63 x (2 - 1))) / 1.25 = 7.62
18 pages/job (5.3 + 3.6 + (0.63 x (18 - 1))) / 1.25 = 15.69
The number of belt rotations required for the color registration = 14 rotations
Example: Performs the color registration adjustment and starts to print after leaving the
machine without printing for a long time.
Continuous printing Page counter based on the number of belt rotations (Pages)
1 page/job (14 + 3.6 + (0.63 x (1 - 1))) / 1.25 = 14.08
2 pages/job (14 + 3.6 + (0.63 x (2 - 1))) / 1.25 = 14.58
18 pages/job (14 + 3.6 + (0.63 x (18 - 1))) / 1.25 = 22.65
If the developing bias voltage correction and the color registration are performed
continuously, the drum unit life is shorter.