Brother MFC-9840CDW Service Manual

Confidential
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4.2 Diameter of Rollers
Image defects which appear periodically may be caused by failure of a roller. Specify the cause
referring to the diameters of the rollers or pitch which appears in the image as shown in the
table below.
No. Parts name Diameter The pitch which
appears in the image
1 Develop roller Ø 20.0 mm 37.4 mm
2 Exposure drum Ø 24.0 mm 75.0 mm
3 Heat roller in the fuser unit Ø 25.0 mm 78.5 mm
4 Pressure roller ASSY in the fuser unit Ø 25.0 mm 78.5 mm
4.3 Troubleshooting Image Defect
Image defect related problems are end user recoverable if following the User Check items. If
the same problem occurs, follow each procedure in the order of the number described in the
Step column in the tables below.
Light on the whole page
User Check
- Check the machine’s environment. High temperature and high humidity
conditions can cause this problem.
- If the whole page is light, toner save mode may be on.
- Replace the toner cartridge or drum unit with a new one.
- Implement calibration from the control panel.
Step Cause
Check
Result
Remedy
1 Transfer HVPS
PCB failure
Is the transfer HVPS PCB
ASSY connected
correctly?
Yes Replace the transfer
HVPS PCB ASSY.
2 Engine PCB
failure
Is the harness between
the HVPS PCB and
engine PCB connected
correctly?
Yes Replace the engine PCB
ASSY.
3 Charge HVPS
PCB failure
Is the harness of the
HVPS PCB connected
correctly?
Yes Replace the charge
HVPS PCB ASSY.
4 Laser unit failure Is the problem solved after
replacing the laser unit?
Yes Replace the laser unit.

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