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Brother MFC-9840CDW Service Manual

Brother MFC-9840CDW
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Confidential
1-1
CHAPTER 1 TROUBLESHOOTING
1. INTRODUCTION
Troubleshooting is the counter measure procedures that the service personnel should follow if
an error or malfunction occurs with the machine. It is impossible to anticipate all of the possible
troubles which may occur in future and determine the troubleshooting procedures, so this
chapter covers some sample troubles. However, those samples will help the service personnel
pinpoint and repair other defective elements.
1.1 Precautions
Be sure to observe and follow all the precautions to prevent any secondary problems from
happening during troubleshooting.
(1) Always turn off the power and unplug the power cable before removing any covers or
PCBs, adjusting the machine and so on. If you need to take voltage measurements with
the power switched on, take the greatest of care not to receive an electric shock.
(2) When connecting or disconnecting cable connectors, make sure that you hold the
connector body and not the cables.
(3) Electronic devices are sensitive to static build up; make sure that you touch a metal
portion of the machine to discharge yourself before accessing the PCBs.
Handle PCBs with care when repairing them.
Verify again that the repaired portion works properly.
1.2 Initial Check
Check the following items before attempting to repair the machine.
<Operating Environment>
(1) Put your machine on a flat, stable surface such as a desk that is free of vibration and
shocks.
(2) Use the machine in a well-ventilated room; use the machine within the following ranges of
temperature and humidity: temperature between 10°C and 32.5°C (50 °F to 90.5 °F), and
the relative humidity is maintained between 20% and 80%.
(3) Ensure the machine is not exposed to direct sunlight, excessive heat, moisture, or dust.
(4) Keep the machine horizontal when you carry it. To prevent injuries when moving or lifting
this machine, make sure to use at least two people.
<Power Supply>
(1) The AC input power supply described on the rating plate of the machine should be within
±10% of the rated voltage.
(2) The AC input power supply is within the regulated value.
(3) The cables and harnesses are connected correctly.
(4) The fuses are not blown.

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Brother MFC-9840CDW Specifications

General IconGeneral
Print technologyLaser
Maximum resolution600 x 2400 DPI
Economical printingYes
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 toE-mail, FTP, OCR, USB
Scanner typeFlatbed scanner
Grayscale levels256
Input color depth48 bit
Maximum scan resolution19200 x 19200 DPI
Optical scanning resolution1200 x 2400 DPI
Copier resize25 - 400 %
Maximum copy resolution1200 x 600 DPI
N-in-1 copy function (N=)4, 9, 16, 25
Copy speed (black, normal quality, A4)16 cpm
FaxingMono faxing
Fax memory400 pages
Modem speed33.6 Kbit/s
Fax speed dialing (max numbers)300
Total input capacity250 sheets
Total output capacity150 sheets
Multi-Purpose tray input capacity50 sheets
Auto document feeder (ADF) input capacity35 sheets
Internal memory128 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 features10/100Base-TX
Wireless technologyIEEE 802.11b/g
All-in-one functionsCopy, Fax, Scan
Maximum internal memory0.640 GB
Color all-in-one functionscopy, print, scan
Media weight (tray 1)60 - 105g/m2
Paper tray media typesBond paper, Envelopes, Labels, Plain paper, Recycled paper
Non-ISO print media sizesExecutive (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 sizeA4
Multi-Purpose Tray media weight60 - 163 g/m²
Security algorithmsLEAP
Supported network protocols (IPv4)TCP/IP (IPv4 & IPv6)
Standard interfacesUSB 2.0
USB 2.0 ports quantity1
Bundled softwareScanSoft PaperPort (Win) NewSoft Presto! PageManager (Mac)
Power consumption (PowerSave)36 W
Power consumption (average operating)515, 100 W
Package weight45800 g
Digital senderNo
Maximum duty cycle3000 pages per month
Market positioningBusiness

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