Brother MFC-7320 Service Manual

1-13
Confidential
■ Error code 78
Fuser unit failure (The temperature sensor of the fuser unit is broken.)
■ Error code 79
No detection of the internal temperature thermistor.
■ Error code 7A
No detection of the main motor lock signal.
■ Error code 7B
Main PCB failure
Print Unable 78
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1 Fuser unit failure Replace the fuser unit.
2 Main PCB failure Replace the main PCB ASSY.
Print Unable 79
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1
Harness connection failure of
internal temperature thermistor
Check the harness connection of the internal
temperature thermistor, and reconnect it.
2
Internal temperature thermistor
failure
Replace the internal temperature
thermistor.
3 Main PCB failure Replace the main PCB ASSY.
Print Unable 7A
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1 Main motor failure Replace the main motor ASSY.
2 Main PCB failure Replace the main PCB ASSY.
Print Unable 7B
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.

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