Brother MFC-7320 Service Manual

1-29
Confidential
5. IMAGE DEFECT TROUBLESHOOTING (Defect Of the Print)
5.1 Image Defect Examples
Fig. 1-5
CAUTION:
The image defect at the copy might have the cause in the scanning.
When the failure does not reproduce by print the test pattern “MAINTENANCE 09” or PC
print, refer to "6. TROUBLESHOOTING OF SCANNIG".
5.2 Diameter of Rollers
Image defects which appear periodically may be caused by failure of a roller. Specify the
cause referring to the diameter of the rollers or pitch which appears in the image as shown in
the table below.
No. Parts name
Diameter
The pitch which
appears in the image
1 Develop roller
Ø20.0 mm 40.6 mm
2 Exposure drum
Ø24.0 mm 75.0 mm
3 Heat roller in the fuser unit
Ø25.0 mm 78.5 mm
4 Pressure roller ASSY in the fuser unit
Ø25.0 mm 78.5 mm
Light
Poor fixing
Dirt on the back of paper
White vertical
streaks
Faint print
Black spots
Downward fogging
of solid color
Horizontal lines
Ghost
Fogging
Black band
White spots
White horizontal
streaks
Vertical streaks
Black vertical streaks
in a light background
Black horizontal
stripes
Completely blank
Image distortion
All black
Faulty registration
Dark

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