Name: Brother MFC-9840CDW
Brand: Brother
Rating: 4 (1 reviews)

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Troubleshooting and routine maintenance

119

Improving the print quality C

If you have a print quality problem, print a test page first (Menu, 4, 2, 3). If the printout looks good,

the problem is probably not the machine. Check the interface cable or try the machine on another

computer.

Note

You can resolve a print quality problem by replacing a toner cartridge with a new one when the

LCD shows the Toner Life End message.

Examples of poor print

quality

Recommendation

White lines or bands or ribbing

across the page

 Make sure that the machine is on a solid level surface.

 Make sure that the toner cartridges are installed properly. (See

Replacing a toner cartridge on page 169.)

 Shake the toner cartridges gently.

 Make sure that the drum unit is installed properly. (See Replacing the

drum unit on page 174.)

 Make sure that you use paper that meets our specifications. A rough

surfaced paper or thick print media can cause the problem. (See

Acceptable paper and other media on page 11.)

 Clean the laser scanner windows with a soft cloth. (See Cleaning the

laser scanner windows on page 152.)

 The drum unit may be damaged. Put in a new drum unit. (See

Replacing the drum unit on page 174.)

Colors are light or unclear on

the whole page.

 Make sure that the recommended paper was used.

 Change the paper to freshly unpacked paper.

 Make sure that the front cover is closed properly.

 Shake the toner cartridges gently.

 Clean the laser scanner windows with a soft cloth. (See Cleaning the

laser scanner windows on page 152.)

 Turn off Toner Save. (See Toner save on page 26.)

White streaks or bands down

the page

 Shake the toner cartridges gently.

 Clean the laser scanner windows with a soft cloth. (See Cleaning the

laser scanner windows on page 152.)

 One of the toner cartridges may be damaged. Identify the missing

color and put in a new toner cartridge. (See Replacing a toner

cartridge on page 169.)

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Other manuals for Brother MFC-9840CDW

Service Manual491 pages

Quick Setup Guide53 pages

Network User's Guide204 pages

Reference Manual62 pages

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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