Brother MFC-9840CDW Service Manual

Confidential
2-2
Life of Drum Unit
<How to read the drum unit life>
- It initially indicates 100% and gradually decreases.
- It indicates 0% when the “Drum End Soon” appears on the LCD.
- It stays at 0% even if further printing is done.
<How to calculate the drum unit life>
The drum unit life is based on the “drum counter” or the “number of drum rotations”.
The drum counter is based on the total printed pages on each drum unit. This total printed
pages should be reset every time you replace the drum unit with a new one. (Refer to “2.3
Parts Life Reset Function” in this chapter.) Basically this amount is equal to the assured
printable pages of the drum unit.
If the developing bias voltage correction or color registration adjustment is performed
frequently, however, only the number of drum rotations increases, and the “page counter
based on the number of drum rotation” exceeds the “drum counter” based on the total
printed page.
Refer to the calculation of the drum unit life based on the number of drum rotation below;
<How to calculate the page counter>
The number of drum rotations for the first page printed is about 27. The number of drum
rotations per one page for the second or later page printed (continuous printing) is 4.6.
Using these figures, the page counter is calculated as follows:
Page counter based on the number of drum rotations = (Number of drum rotations for the
first page printed + (Number of drum rotations per one page for the second or later page
printed x (Number of pages in continuous printing - 1))) / 27
(* The number of drum rotations per one page continuous printing.)
Example: Starts to print when the machine is in the Ready state.
Continuous printing Page counter based on the number of drum rotations (Pages)
1 page/job (27 + (4.6 x (1 - 1))) / 27 = 1
2 pages/job (27 + (4.6 x (2 - 1))) / 27 = 1.17
18 pages/job (27 + (4.6 x (18 - 1))) / 27 = 3.89
If you leave the machine without printing for a long time, the number of drum 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 drum unit life is shorter than usual.
The number of drum rotations required for the developing bias voltage correction = 40
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 drum rotations (Pages)
1 page/job (40 + 27 + (4.6 x (1 - 1))) / 27 = 2.48
2 pages/job (40 + 27 + (4.6 x (2 - 1))) / 27 = 2.65
18 pages/job (40 + 27 + (4.6 x (18 - 1))) / 27 = 5.37
The number of drum rotations required for the color registration = 104 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 drum rotations (Pages)
1 page/job (104 + 27 + (4.6 x (1 - 1))) / 27 = 4.85
2 pages/job (104 + 27 + (4.6 x (2 - 1))) / 27 = 5.02
18 pages/job (104 + 27 + (4.6 x (18 - 1))) / 27 = 7.75
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