Brother MFC-7320 Service Manual

1-36
Confidential
■ Black horizontal stripes
Fig. 1-7
User Check
• Clean the inside of the machine and the corona wire in the drum
unit.
• Replace the drum unit with a new one.
Step Cause Check
Result Remedy
1
Dirt on the
charge electrode
Are the electrodes on
the drum unit and
machine body dirty?
Ye s
Clean both electrodes.
(Refer to Fig. 1-1, Fig. 1-2.)
2
Paper tray
ground terminal
located in the
machine body
Is the paper tray ground
terminal bent, which is
located in the machine
body?
(Refer to
Fig. 1-7 .)
Ye s
Correct the bending of
paper tray ground terminal.
3
Toner attached
on the develop
roller
Are the horizontal stripes
at 40.6 mm (develop
roller circumference)
intervals?
Ye s
This problem will disappear by
printing approximate 10 pages.
If the same problem occurs,
replace the toner cartridge.
4
Scratch and Dirt
on the exposure
drum
Are the horizontal stripes
at 75.0 mm (exposure
drum circumference)
intervals?
Ye s
Replace the drum unit.
5
Scratch and Dirt
on the heat roller
Are the horizontal stripes
at 78.5 mm (heat roller
circumference) intervals?
Ye s
Replace the fuser unit.
6
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Ye s
Replace the HVPS PCB
ASSY.
7
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.
Paper tray ground terminal.
Bottom surface
of Paper tray

Brother MFC-7320 Specifications

General

Print technology	Laser
Maximum resolution	2400 x 600 DPI
Time to first page (black, normal)	10 s
Print speed (black, normal quality, A4/US Letter)	18 ppm
Copier resize	25 - 400 %
PC free copying	Yes
Maximum copy resolution	600 x 600 DPI
Copy speed (black, normal quality, A4)	11 cpm
Faxing	Mono faxing
Fax memory	400 pages
Fax speed dialing (max numbers)	200
Total input capacity	250 sheets
Total output capacity	100 sheets
Multi-Purpose tray input capacity	1 sheets
Auto document feeder (ADF) input capacity	35 sheets
Sound power level (standby)	32 dB
Sound pressure level (printing)	53 dB
Standard interfaces	USB 2.0
Dimensions (WxDxH)	428 x 396 x 304 mm
All-in-one functions	Copy, Fax, Scan
Color all-in-one functions	scan, n
Compatible operating systems	Windows Vista, XP (32 & 64 bit); Windows 2000, Mac OS X 10.2.4 en recenter Linux printer driver
Power consumption (standby)	75 W
Power consumption (PowerSave)	9 W
Power consumption (average operating)	320 W
Display	LCD
Market positioning	Home & office
Media weight (tray 1)	60 - 105 g/m²
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Bundled software	ScanSoft Paperport 11 SE+OCR, Newsoft Presto!, PageManager7 (Mac)
Package weight	14.900 g
Grayscale levels	256
Input color depth	24 bit
Sustainability certificates	ENERGY STAR