Brother MFC-8520DN Service Manual

2-16
Confidential
 Life of drum unit
<How to read the life of drum unit>
• The band graph indicates 100% initially, and then gradually decreases.
• When the band graph indicates 10%, the machine displays a message prompting the user
to replace the drum.
<How to determine the end of life of drum unit>
The end of life of the drum unit is determined based on the "drum counter" or the "number of
drum rotations", whichever is larger.
The drum counter is based on the total number of pages printed on each drum unit. The drum
counter must be reset every time you replace the drum unit with a new one (refer to <How to
reset drum counter> on the next page). Basically, the counter value is equal to the assured
number of printable pages of the drum unit. However, if the power switch is turned ON/OFF
frequently or the number of pages printed per job is small, only the number of drum rotations
increases, and the "page count based on the number of drum rotations" may exceed the "drum
counter" based on the total number of pages printed.
Calculation of the page count based on the number of drum rotations shown below.
<How to calculate the page count>
The number of drum rotations for the first page: 12.2
The number of drum rotations per page for the second page and later (continuous printing): 3.8
Page count based on the number of drum rotations = {Number of drum rotations for the first
page + [Number of drum rotations per page for the second page and later x (Number of pages
in continuous printing - 1)]} / 15
(The divisor "15" is assumed value of the number of drum rotations per page when end users
use machines.)
(The number of drum rotations per page is fewer in continuous printing.)
When warm-up operation after power ON or opening/closing cover, paper tray lift-up
operation, or fuser unit warm-up operation is performed, the number of drum rotations
increases. Therefore, if these operations are performed frequently, the life of the drum unit
becomes shorter than usual.
The number of drum rotations required for warm-up operation after power ON: 15
Example: Start printing when machine is in ready state
Continuous pages printed Page count based on number of drum rotations (pages)
1 page [12.2 + {3.8 x (1 - 1)}] / 15 = 0.8
2 pages [12.2 + {3.8 x (2 - 1)}] / 15 = 1.1
18 pages [12.2 + {3.8 x (18 - 1)}] / 15 = 5.1
Example: When warm-up operation after power ON or opening/closing cover is performed
before printing
Continuous pages printed Page count based on number of drum rotations (pages)
1 page [15 + 12.2 + {3.8 x (1 - 1)}] / 15 = 1.8
2 pages [15 + 12.2 + {3.8 x (2 - 1)}] / 15 = 2.1
18 pages [15 + 12.2 + {3.8 x (18 - 1)}] / 15 = 6.1

Brother MFC-8520DN Specifications

General

Print technology	Laser
Maximum resolution	1200 x 1200 DPI
Economical printing	Yes
Duplex printing mode	Auto
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	36 ppm
Duplex print speed (black, normal quality, A4/US Letter)	9 ppm
PictBridge	No
Scan speed	2.68 sec/page
Dimensions (WxDxH)	405 x 415 x 423 mm
All-in-one functions	Copy, Fax, Print, Scan
Color all-in-one functions	Scan
Printing colors	Black
Maximum duty cycle	- pages per month
Recommended duty cycle	500 - 3500 pages per month
Number of print cartridges	1
Page description languages	BR-Script 3, Epson FX, IBM ProPrinter, PCL 6
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4, 9, 16, 25
Time to first copy (black, normal)	10.5 s
Copy speed (black, normal quality, A4)	36 cpm
Scan to	E-mail, E-mail Server, File, FTP, Image, OCR, USB
Scan drivers	ICA, ISIS, TWAIN
Scanner type	Flatbed & ADF scanner
Grayscale levels	256
Input color depth	48 bit
Maximum scan area	Legal (216 x 356) mm
Output color depth	24 bit
Image formats supported	BMP, JPG
Maximum scan resolution	19200 x 19200 DPI
Document formats supported	PDF
Faxing	Mono faxing
Fax memory	500 pages
Modem speed	33.6 Kbit/s
Fax coding methods	JBIG, JPEG, MH, MMR (Fax coding method), MR
Fax speed dialing (max numbers)	300
Paper input type	Paper tray
Total input capacity	250 sheets
Total output capacity	150 sheets
Maximum input capacity	850 sheets
Maximum number of input trays	2
Multi-Purpose tray input capacity	50 sheets
Auto document feeder (ADF) input capacity	35 sheets
Custom media width	76.2 - 215.9 mm
Maximum print size	216 x 356 mm
Custom media length	127 - 355.6 mm
Paper tray media types	Bond paper, Plain paper, Pre-Printed, Recycled paper, Thin paper
Paper tray media weight	60 - 105 g/m²
Non-ISO print media sizes	Legal
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Multi-purpose tray media types	Bond paper, Envelopes, Heavyweight paper, Labels, Plain paper, Recycled paper
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Auto Document Feeder (ADF) media weight	64 - 90 g/m²
Display	LCD
Market positioning	Home & office
Display number of lines	5 lines
Display number of characters	22
Standard interfaces	Ethernet, USB 2.0
Security algorithms	802.1x RADIUS, EAP, EAP-TLS, EAP-TTLS, MD5, PEAP
Processor family	Star Sapphire
Maximum internal memory	384 MB
Sound power level (standby)	37 dB
Sound pressure level (printing)	59 dB
Sound pressure level (quiet mode)	54 dB
AC input voltage	220 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (off)	1.2 W
Power consumption (standby)	8.1 W
Power consumption (PowerSave)	336 W
Power consumption (average operating)	651 W
Package weight	20.100 g
Sustainability certificates	ENERGY STAR