Brother MFC-8520DN Service Manual

2-96
Confidential
4.13 Troubleshooting for Fax Problems
4.13.1 Fax cannot be sent
4.13.2 Fax cannot be received
4.13.3 Bell does not sound
4.13.4 Communication error occurs
<User Check>
- Check that the line cord is inserted into the socket correctly.
- Check that the dial function setting (tone/pulse) is correct.
Step Cause Remedy
1
Connection failure of the NCU PCB
harness
Check the connection of the NCU PCB
harness, and reconnect it if necessary.
2 Rubber key failure Replace the rubber key.
3 Panel PCB failure Replace the panel PCB ASSY.
4 Touch panel PCB failure Replace the touch panel PCB ASSY.
5 NCU PCB failure Replace the NCU PCB ASSY.
6
First side CIS unit or second side
CIS unit failure
Replace the first side CIS unit or second
side CIS unit.
7 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Check that the line cord is inserted into the socket correctly.
- Check that the receiving mode setting is correct.
Step Cause Remedy
1
Connection failure of the NCU PCB
harness
Check the connection of the NCU PCB
harness, and reconnect it if necessary.
2 NCU PCB failure Replace the NCU PCB ASSY.
3 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Check that "0" is not set for the number of rings.
- Check that "0" is not set for the bell volume.
Step Cause Remedy
1
Connection failure of the speaker
harness
Check the connection of the speaker
harness, and reconnect it if necessary.
2 Speaker failure Replace the speaker unit.
3 NCU PCB failure Replace the NCU PCB ASSY.
4 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Check whether there is any noise source near the machine.
Step Cause Remedy
1
Connection failure of the NCU PCB
harness
Check the connection of the NCU PCB
harness, and reconnect it if necessary.
2 NCU PCB failure Replace the NCU PCB ASSY.
3 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