Brother MFC-B7715DW User Manual

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Confidential
4.8 Troubleshooting for Fuser Unit Problems
4.8.1 Fuser unit failure
4.9 Troubleshooting for Laser Unit Problems
4.9.1 Laser unit failure
<User Check>
• Turn ON the power switch, then open the front cover and the back cover. Leave the machine
for a while to remove condensation.
Step Cause Remedy
1
Connection failure of the
center thermistor harness
Reconnect the center thermistor harness.
2
Connection failure of the side
thermistor harness
Reconnect the side thermistor harness.
3
Connection failure of the
heater harness
Reconnect the heater harness.
4
Connection failure of the eject
sensor PCB harness
Reconnect the eject sensor PCB harness.
5 Eject sensor PCB failure Replace the eject sensor PCB ASSY.
6
Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
ASSY.
7 Fuser unit failure Replace the fuser unit.
8 Main PCB failure Replace the main PCB ASSY.
Note:
• Turn the power switch OFF and then ON again. Leave the machine for 15 minutes.
This problem may then be cleared.
• The machine may recover from the error, when the test printing of the maintenance mode
for service personnel is started. However, conducting this operation while the heater has
not yet cooled may cause the fuser unit to melt. Be careful.
Step Cause Remedy
1 Laser unit attachment failure Reattach the laser unit.
2
Connection failure of the laser
unit flat cable
Reconnect the laser unit flat cable.
3
Connection failure of the
polygon motor harness
Reconnect the polygon motor harness.
4 Laser unit failure Replace the laser unit.
5 Main PCB failure Replace the main PCB ASSY.

Brother MFC-B7715DW Specifications

General

N-up printing	2, 4, 9, 16, 25
Secure printing	Yes
Print technology	Laser
Maximum resolution	1200 x 1200 DPI
Duplex printing mode	Auto
Warm-up time (from sleep mode)	9 s
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	34 ppm
Duplex print speed (black, normal quality, A4/US Letter)	16 ppm
Copier resize	25 - 400 %
Maximum copy resolution	600 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4
Copy speed (black, normal quality, A4)	34 cpm
Scan to	E-mail, FTP, File, Image, OCR
Scan drivers	SANE, TWAIN, WIA
Grayscale levels	256
Output color depth	24 bit
Scan speed (black)	22.5 ppm
Scan speed (color)	7.5 ppm
Output grayscale depth	8 bit
Maximum scan resolution	19200 x 19200 DPI
Faxing	Mono faxing
Fax memory	400 pages
Fax coding methods	JBIG
Fax transmission speed	33.6 sec/page
Digital sender	No
Printing colors	Black
Maximum duty cycle	15000 pages per month
Number of PostScript fonts	66
Number of print cartridges	1
Page description languages	BR-Script 3, PCL 6, PDF 1.7
Paper input type	Paper tray
Total input capacity	250 sheets
Total output capacity	120 sheets
Multi-Purpose tray input capacity	1 sheets
Auto document feeder (ADF) input capacity	50 sheets
Custom media width	76.2 - 215.9 mm
Custom media length	127 - 355.6 mm
Paper tray media types	Plain paper
Paper tray media weight	60 - 163 g/m²
ISO A-series sizes (A0...A9)	A4, A5, A6
Multi-purpose tray media types	Executive, Legal, Letter
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 230 g/m²
Auto Document Feeder (ADF) media weight	64 - 105 g/m²
Wi-Fi standards	802.11b, 802.11g, Wi-Fi 4 (802.11n)
Cabling technology	10/100Base-T(X)
Security algorithms	64-bit WEP, 128-bit WEP, WPA-PSK, WPA2-PSK, WPS
Ethernet LAN data rates	10, 100 Mbit/s
Mobile printing technologies	Apple AirPrint, Brother iPrint & Scan, Google Cloud Print, Mopria Print Service
Supported network protocols (IPv4)	ARP, RARP, BOOTP, DHCP, APIPA(Auto IP), WINS/NetBIOSnameresolution, DNS Resolver, mDNS, LLMNR responder, LPR/LPD, CustomRaw Port/Port9100, SMTP, IPP/IPPS, FTP, SNMPv1/v2c/v3, HTTP/HTTPS, TFTP, ICMP, Web Services, SNTP
Supported network protocols (IPv6)	NDP, RA, DNS resolver, mDNS, LLMNR responder, LPR/LPD, CustomRaw Port/Port9100, IPP/IPPS, SMTP, FTP, SNMPv1/v2c/v3, HTTP/ HTTPS, TFTP, ICMPv6, SNTP, Web Services
Internal memory	128 MB
Sound power level (standby)	30 dB
Sound pressure level (printing)	49 dB
Sound pressure level (quiet mode)	44 dB
Product color	Gray
Market positioning	Home & office
Display number of lines	2 lines
Mac operating systems supported	Mac OS X 10.10 Yosemite, Mac OS X 10.11 El Capitan, Mac OS X 10.12 Sierra, Mac OS X 10.13 High Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina
Server operating systems supported	Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016
Windows operating systems supported	Windows 10, Windows 7, Windows 8, Windows 8.1
AC input voltage	220 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (sleep)	6.2 W
Power consumption (standby)	42 W
Power consumption (printing)	475 W
Power consumption (average operating)	- W
Energy Star Typical Electricity Consumption (TEC)	1348 kWh/week
Package depth	517 mm
Package width	580 mm
Package height	434 mm
Package weight	15100 g
Quantity per pack	1 pc(s)
Sustainability certificates	RoHS, ENERGY STAR

Weight and Dimensions

Depth	398.5 mm
Width	410 mm
Height	318.5 mm
Weight	12000 g