Brother MFC-9840CDW Service Manual

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 printed + (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.

Brother MFC-9840CDW Specifications

General

Print technology	Laser
Maximum resolution	600 x 2400 DPI
Economical printing	Yes
Time to first page (black, normal)	16 s
Time to first page (color, normal)	17 s
Print speed (black, normal quality, A4/US Letter)	20 ppm
Scan to	E-mail, FTP, OCR, USB
Scanner type	Flatbed scanner
Grayscale levels	256
Input color depth	48 bit
Maximum scan resolution	19200 x 19200 DPI
Optical scanning resolution	1200 x 2400 DPI
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
N-in-1 copy function (N=)	4, 9, 16, 25
Copy speed (black, normal quality, A4)	16 cpm
Faxing	Mono faxing
Fax memory	400 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	300
Total input capacity	250 sheets
Total output capacity	150 sheets
Multi-Purpose tray input capacity	50 sheets
Auto document feeder (ADF) input capacity	35 sheets
Internal memory	128 MB
Sound power level (standby)	30 dB
Sound pressure level (printing)	54.5 dB
Custom media sizes	(69.9 - 216mm) - (116 - 406.4mm)
Dimensions (WxDxH)	530 x 539 x 520 mm
Networking features	10/100Base-TX
Wireless technology	IEEE 802.11b/g
All-in-one functions	Copy, Fax, Scan
Maximum internal memory	0.640 GB
Color all-in-one functions	copy, print, scan
Media weight (tray 1)	60 - 105g/m2
Paper tray media types	Bond paper, Envelopes, Labels, Plain paper, Recycled paper
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Legal (media size), Letter (media size)
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
JIS B-series sizes (B0...B9)	B5
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Security algorithms	LEAP
Supported network protocols (IPv4)	TCP/IP (IPv4 & IPv6)
Standard interfaces	USB 2.0
USB 2.0 ports quantity	1
Bundled software	ScanSoft PaperPort (Win) NewSoft Presto! PageManager (Mac)
Power consumption (PowerSave)	36 W
Power consumption (average operating)	515, 100 W
Package weight	45800 g
Digital sender	No
Maximum duty cycle	3000 pages per month
Market positioning	Business