Brother MFC-8520DN Service Manual

2-87
Confidential
4.6 Troubleshooting for Control Panel Problems
4.6.1 Nothing is displayed on the LCD
4.6.2 Control panel is inoperable
Step Cause Remedy
1 AC cord failure Replace the AC cord.
2
Connection failure of the panel
harness
Check the connection of the panel harness,
and reconnect it if necessary.
3
Connection failure of the backlight
harness
Check the connection of the backlight
harness, and reconnect it if necessary.
4
Connection failure of the LCD
harness
Check the connection of the LCD harness,
and reconnect it if necessary.
5 LCD failure Replace the LCD.
6 LCD flat cable or LCD ASSY failure Replace the LCD ASSY.
7 Backlight ASSY failure Replace the backlight ASSY.
8 Panel PCB failure Replace the panel PCB ASSY.
9 Touch panel PCB failure Replace the touch panel PCB ASSY.
10
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
11 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Check that the function lock is not set.
Step Cause Remedy
1 Panel unit attachment failure Reattach the panel unit.
2
Connection failure of the panel PCB
harness
Check the connection of the panel PCB
harness, and reconnect it if necessary.
3
Connection failure of the touch
panel PCB harness
Check the connection of the touch panel
PCB harness, and reconnect it if necessary.
4
Connection failure of the touch
panel harness
Check the connection of the touch panel
harness, and reconnect it if necessary.
5 Rubber key failure Replace the rubber key R, L or C.
6 Panel PCB failure Replace the panel PCB ASSY.
7 Touch panel PCB failure Replace the touch panel PCB ASSY.
8 Touch panel ASSY failure Replace the touch panel ASSY.
9
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
10 Main PCB failure Replace the main PCB ASSY.

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