Brother MFC-8480DN Service Manual

Confidential
CHAPTER 2 THEORY OF OPERATION
This chapter gives an overview of the scanning and printing mechanisms as well as the
sensors, actuators, and control electronics. It aids in understanding the basic principles of
operation as well as locating defects for troubleshooting
CONTENTS
1. OVERVIEW ...................................................................................................................2-1
2. ELECTRONICS .............................................................................................................2-2
2.1 General Block Diagram ......................................................................................... 2-2
3. MECHANICS .................................................................................................................2-3
3.1 Cross-section Drawing ..........................................................................................2-3
3.2 Scanner Mechanism..............................................................................................2-6
3.2.1 Document scanner unit ..............................................................................2-7
3.2.2 ADF unit ..................................................................................................... 2-9
3.3 Paper Feeding .....................................................................................................2-16
3.3.1 Plate-up Function of the Paper Tray ........................................................ 2-17
3.3.2 Paper supply ............................................................................................2-18
3.3.3 Paper registration .....................................................................................2-19
3.3.4 Paper eject ...............................................................................................2-20
3.3.5 Duplex printing ......................................................................................... 2-21
3.3.6 Paper feeding from the MP tray ...............................................................2-22
3.3.7 Paper feeding from the LT tray (Tray2) ....................................................2-22
3.4 Toner Cartridge.................................................................................................... 2-23
3.4.1 Methods for Detecting Toner Life .............................................................2-23
3.4.2 Cartridge life .............................................................................................2-24
3.4.3 New toner detection .................................................................................2-25
3.5 Print ..................................................................................................................... 2-28
3.5.1 Basic Principle..........................................................................................2-28
3.5.2 Print Process ............................................................................................2-29
3.6 Sensors position .................................................................................................. 2-34

Brother MFC-8480DN Specifications

General

Print technology	Laser
Maximum resolution	1200 x 1200 DPI
Economical printing	Yes
Print speed (black, normal quality, A4/US Letter)	32 ppm
Grayscale levels	256
Input color depth	48 bit
Image formats supported	BMP, JPG, TIF
Maximum scan resolution	19200 x 19200 DPI
Optical scanning resolution	600 x 2400 DPI
Copier resize	25 - 400 %
Maximum number of copies	99 copies
Copy speed (black, normal quality, A4)	32 cpm
Faxing	Mono faxing
Fax memory	600 pages
Modem speed	33.6 Kbit/s
Power supply type	AC
Weight (imperial)	40.3 lbs
Dimensions (WxDxH)	530.8 x 449.5 x 474.9 mm
Power requirements	110 - 240V, 50/60 Hz
All-in-one functions	Copy, Fax, Scan
Standard media sizes	2.75'' - 8.5\
Maximum internal memory	0.576 GB
Color all-in-one functions	scan, n
Compatible operating systems	Windows OS Mac OS
Package dimensions (W x D x H)	24.7 x 22.3 x 22.6 \
Total input capacity	250 sheets
Total output capacity	150 sheets
Auto document feeder (ADF) input capacity	50 sheets
Display	LCD
Market positioning	Business
Internal memory	64 MB
Sound pressure level (copying)	56 dB
Sound pressure level (printing)	30 dB
Maximum print size	216 x 356 mm
Paper tray media types	Bond paper, Envelopes, Plain paper, Recycled paper, Transparencies
Non-ISO print media sizes	Executive
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Maximum ISO A-series paper size	A4
Supported network protocols (IPv4)	ARP, RARP, BOOTP, DHCP, APIPA, LLMNR, LPR/LPD, IPP/IPPS, FTP, HTTP/HTTPS, SSL/TLS, TFTP, SMTP, APOP, POP, SMTP, SMTP-AUTH, SNMPv1/v2c/v3, ICMP, LLTD, CIFS, SNTP, NDP, RA, DNS, mDNS, ICMPv6
Standard interfaces	USB 2.0
USB 2.0 ports quantity	1
Power consumption (standby)	18 W
Power consumption (average operating)	680 W
Package weight	21645 g
Sustainability certificates	ENERGY STAR
Maximum duty cycle	30000 pages per month
Recommended duty cycle	3500 pages per month
Operating temperature (T-T)	10 - 32.2 °C
Operating relative humidity (H-H)	20 - 80 %