Brother MFC-9840CDW Service Manual

Confidential
1-51
Vertical streaks in a light background
User Check
- Clean the inside of the machine and the corona wire in the drum unit.
- Replace the toner cartridge with a new one.
Step Cause
Check Result Remedy
1 Drum unit failure Is the problem solved after
replacing the drum unit?
Yes Replace the drum unit.
Horizontal stripes
User Check
- Clean the inside of the machine and the corona wire in the drum unit.
- Replace the drum unit with a new one.
Step Cause
Check Result Remedy
1 Dirt on the
charged electrode
Are the electrodes on the
drum unit and machine
body dirty?
Yes Clean both electrodes
2 Paper tray ground
terminal provided
in the machine
body
Is the paper tray ground
terminal bent, which is
provided in the machine
body? (Refer to Fig. 1-4.)
Yes Correct bending of paper
tray ground terminal.
3 Toner attached on
the develop roller
Are the horizontal stripes
at 37.4 mm (develop roller
circumference) intervals?
Yes This problem will disappear
by printing approximate 10
pages. If the same problem
occurs, replace the toner
cartridge.
4 Scratch on the
exposure drum
Are the horizontal stripes at
75.0 mm (exposure drum
circumference) intervals?
Yes Replace the drum unit.
5 Scratch on the
heat roller
Are the horizontal stripes
at 78.5mm (heat roller
circumference) intervals?
Yes Replace the fuser unit.
6 Transfer HVPS
PCB failure
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
7 Charge HVPS
PCB failure
Is the problem solved after
replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
Fig. 1-4
Paper tray ground terminal

Brother MFC-9840CDW Specifications

General

Print technology	Laser
Maximum resolution	600 x 2400 DPI
Economical printing	Yes
Time to first page (black, normal)	16 s
Time to first page (color, normal)	17 s
Print speed (black, normal quality, A4/US Letter)	20 ppm
Scan to	E-mail, FTP, OCR, USB
Scanner type	Flatbed scanner
Grayscale levels	256
Input color depth	48 bit
Maximum scan resolution	19200 x 19200 DPI
Optical scanning resolution	1200 x 2400 DPI
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
N-in-1 copy function (N=)	4, 9, 16, 25
Copy speed (black, normal quality, A4)	16 cpm
Faxing	Mono faxing
Fax memory	400 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	300
Total input capacity	250 sheets
Total output capacity	150 sheets
Multi-Purpose tray input capacity	50 sheets
Auto document feeder (ADF) input capacity	35 sheets
Internal memory	128 MB
Sound power level (standby)	30 dB
Sound pressure level (printing)	54.5 dB
Custom media sizes	(69.9 - 216mm) - (116 - 406.4mm)
Dimensions (WxDxH)	530 x 539 x 520 mm
Networking features	10/100Base-TX
Wireless technology	IEEE 802.11b/g
All-in-one functions	Copy, Fax, Scan
Maximum internal memory	0.640 GB
Color all-in-one functions	copy, print, scan
Media weight (tray 1)	60 - 105g/m2
Paper tray media types	Bond paper, Envelopes, Labels, Plain paper, Recycled paper
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Legal (media size), Letter (media size)
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
JIS B-series sizes (B0...B9)	B5
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Security algorithms	LEAP
Supported network protocols (IPv4)	TCP/IP (IPv4 & IPv6)
Standard interfaces	USB 2.0
USB 2.0 ports quantity	1
Bundled software	ScanSoft PaperPort (Win) NewSoft Presto! PageManager (Mac)
Power consumption (PowerSave)	36 W
Power consumption (average operating)	515, 100 W
Package weight	45800 g
Digital sender	No
Maximum duty cycle	3000 pages per month
Market positioning	Business