Brother DCP-B7500D Service Manual

2-86
Confidential
 Dark
 Poor fixing
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• If a new toner cartridge has been detected, check that it was not
replaced with another toner cartridge.
• Execute density adjustment from the control panel.
• Clean the corona wire of the drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirt on the electrodes of the
drum unit and those of the
machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 2-12 (P2-
56) and Fig. 2-13 (P2-56).)
2
Wrong adjusted value of the
laser unit entered
Refer to “3.1 Entering Adjusted Value of
Laser Unit” in Chapter 4, and enter the
adjusted value of the laser unit correctly.
3
Dirt on the electrodes of the
high-voltage power supply PCB
Clean the electrodes of the high-voltage
power supply PCB.
4 Fuser unit failure Replace the fuser unit.
5
High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
6 Laser unit failure Replace the laser unit.
7 Main PCB failure Replace the main PCB ASSY.
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• Clean the corona wire of the drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirt on the electrodes of the
drum unit and those of the
machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 2-12 (P2-
56) and Fig. 2-13 (P2-56).)
2
Dirt on the electrodes of the
toner cartridge and those of
the machine
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to Fig. 2-12
(P2-56) and Fig. 2-16 (P2-84).)
3 Fuser unit failure Replace the fuser unit.
4
High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
5
Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
ASSY.
6 Laser unit failure Replace the laser unit.
7 Main PCB failure Replace the main PCB ASSY.

Brother DCP-B7500D Specifications

General

Duplex printing	Yes
Print technology	Laser
Maximum resolution	2400 x 600 DPI
Duplex printing mode	Auto
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	34 ppm
Printing colors	Black
Duplex functions	Print
Maximum duty cycle	15000 pages per month
Number of print cartridges	1
Page description languages	BR-Script 3, PCL 6, PDF 1.7
Copier resize	25 - 400 %
Duplex copying	-
Maximum copy resolution	600 x 600 DPI
Maximum number of copies	99 copies
Scan to	E-mail, File, Image
Input color depth	30 bit
Output color depth	24 bit
Input grayscale depth	10 bit
Output grayscale depth	8 bit
Optical scanning resolution	1200 x 1200 DPI
Faxing	No
Total input capacity	250 sheets
Total output capacity	120 sheets
Paper tray media types	Plain paper, Recycled paper, Thin paper
Paper tray media weight	60 - 230 g/m²
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Legal (media size)
ISO A-series sizes (A0...A9)	A4, A5, A6
Maximum ISO A-series paper size	A4
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Product color	Gray
Market positioning	Home & office
Mac operating systems supported	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, Mac OS X 10.15.3 Catalina, Mac OS X 10.2 Jaguar, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks, Mac OS X 11.0 Big Sur
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 (off)	0.03 W
Power consumption (ready)	42 W
Power consumption (sleep)	6.2 W
Power consumption (printing)	485 W

Weight and Dimensions

Depth	398.5 mm
Width	410 mm
Height	272 mm