Brother MFC-J491DW User Manual

Home > Routine Maintenance > Clean Your Brother Machine > Clean the Scanner
Clean the Scanner
1. Unplug the machine from the AC power outlet.
2. Lift the document cover (1). Clean the scanner glass (2) and the white plastic (3) with a soft lint-free cloth
moistened with water.
2
1
3
3. In the ADF unit, clean the white bar (1) and the glass strip (2) with a lint-free cloth moistened with water. (ADF
models only)
2
1
(ADF models only)
In addition to cleaning the scanner glass and glass strip with a soft lint-free cloth moistened with water, run
your fingertip over the glass to see if you can feel anything on it. If you feel dirt or debris, clean the glass
again concentrating on that area. You may need to repeat the cleaning process three or four times. To test,
make a copy after each cleaning attempt.
When there is a spot of dirt or correction fluid on the glass strip, the printed sample shows a vertical line.
After the glass strip is cleaned, the vertical line is gone.
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Brother MFC-J491DW Specifications

General

Display	LCD
Product color	Black
Built-in display	Yes
Display diagonal	1.77 \
Market positioning	Home & office
Internal memory	128 MB
Card reader integrated	No
Sound pressure level (copying)	50 dB
Print technology	Inkjet
Maximum resolution	1200 x 6000 DPI
Duplex printing mode	Auto
Print speed (ISO/IEC 24734) mono	12 ipm
Print speed (ISO/IEC 24734) color	6 ipm
Time to first page (black, normal)	8 s
Duplex print speed (ISO/IEC 24734) mono	3 ipm
Duplex print speed (ISO/IEC 24734) color	1.7 ipm
Print speed (black, normal quality, A4/US Letter)	27 ppm
Print speed (color, normal quality, A4/US Letter)	10 ppm
Standard interfaces	USB 2.0, Wireless LAN
USB 2.0 ports quantity	1
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
Package depth	249 mm
Package width	447 mm
Package height	457 mm
Package weight	10100 g
Power consumption (off)	0.2 W
Power consumption (sleep)	1 W
Power consumption (standby)	3.5 W
Power consumption (printing)	16 W
Power consumption (average operating)	- W
Sustainability certificates	Nordic Swan Ecolabel, ENERGY STAR
Faxing	Mono faxing
Fax memory	170 pages
Modem speed	14.4 Kbit/s
Wi-Fi standards	802.11b, 802.11g, Wi-Fi 4 (802.11n)
Security algorithms	64-bit WEP, 128-bit WEP, WPA-PSK, WPA2-PSK
Mobile printing technologies	Apple AirPrint, Mopria Print Service
Paper input type	Paper tray
Total input capacity	100 sheets
Total output capacity	50 sheets
Auto document feeder (ADF) input capacity	20 sheets
Paper tray media types	Plain paper
Borderless printing media sizes	A4
Scan to	E-mail, File, Image, OCR
Scanner type	Flatbed & ADF scanner
Input color depth	30 bit
Output color depth	24 bit
Maximum scan resolution	19200 x 19200 DPI
Optical scanning resolution	1200 x 2400 DPI
Digital sender	-
Maximum duty cycle	- pages per month
Harmonized System (HS) code	84433100

Weight and Dimensions

Depth	341 mm
Width	400 mm
Height	172 mm