Brother MFC 9840CDW User Manual

General information
9
1
Status LED indications1
The Status LED (light emitting diode) will flash and change colour depending on the machine’s 
status.
 
The LED indications shown in the table below are used in the illustrations in this chapter.
LEDLED Status
 LED is off.
 
Green
 
Yellow
 
RedLED is on.
 
Green
 
Yellow
 
RedLED is blinking.
LEDMachine StatusDescription
 Sleep Mode The power switch is off or the machine is in Sleep mode.
 
GreenWarming Up The machine is warming up for printing....

Chapter 1
10
Note
When the power switch is off or the machine is in sleep mode, the LED is off. 
  
RedService error Follow the steps below.
1. Turn off the power switch.
2. Wait a few seconds, and then turn it back on and try to print 
again.
If you cannot clear the error and you see the same service call 
indication after turning the machine back on, please call your 
Brother dealer.
 
RedCover open The front cover or back cover is open. Close the cover. 
Toner life end Replace the toner cartridge with...

11
2
2
Acceptable paper and 
other media
2
Recommended paper2
To get the best print quality, we suggest using 
the following paper.
Print quality may vary according to the type of 
paper you are using.
You can use the following types of media: 
plain paper, labels or envelopes.
For best results, follow the steps below:
„Use paper made for plain paper copying. 
„Use paper that is 75 to 90 g/m
2. 
„Use labels which are designed for use in 
laser printers.
„Avoid touching the printed surface of the 
paper...

Chapter 2
12
The names for the paper trays in the printer driver and this Guide are as follows:2
Paper capacity of the paper trays2
1Folio size is 8 in. × 13 in.
Recommended paper specifications2
The following paper specifications are suitable for this machine.
Tray and optional unitName
Standard paper tray Tray 1
Optional lower tray Tray 2
Multi-purpose tray MP tray
Paper sizePaper typesNo. of sheets
Paper Tray
(Tray #1)A4, Letter, Legal, 
Executive, A5, A6, B5, 
B6 and Folio
1
Plain paper, Thin paper...

Loading paper and documents
13
2 Handling and using special 
paper2
The machine is designed to work well with 
most types of xerographic and bond paper. 
However, some paper variables may have an 
effect on print quality or handling reliability. 
Always test samples of paper before 
purchasing to ensure desirable performance. 
Store paper in its original packaging and keep 
it sealed. Keep the paper flat and away from 
moisture, direct sunlight and heat.
Some important guidelines when selecting 
paper...

Chapter 2
14
Envelopes2
Most envelopes will be suitable for your 
machine. However, some envelopes may 
have print-quality problems because of the 
way they have been made. A suitable 
envelope should have edges with straight, 
well-creased folds and the leading edge 
should not be thicker than two pieces of 
paper. The envelope should lie flat and not be 
of baggy or flimsy construction. You should 
buy quality envelopes from a supplier who 
understands that you will be using the 
envelopes in a laser...

Loading paper and documents
15
2
Types of envelopes to avoid2
CAUTION 
DO NOT use envelopes:
• that are damaged, curled, wrinkled or an 
unusual shape
• that are extremely shiny or textured
• with clasps, staples, snaps or tie strings
• with self-adhesive closures
• that are of a baggy construction
• that are not sharply creased
• that are embossed (have raised writing 
on them)
• that were previously printed by a laser 
machine
• that are pre-printed on the inside
• that cannot be arranged neatly when...

Chapter 2
16
Labels2
The machine will print on most types of labels 
designed for use with a laser machine. Labels 
should have an adhesive that is acrylic-based 
since this material is more stable at the high 
temperatures in the fuser unit. Adhesives 
should not come in contact with any part of 
the machine, because the label stock may 
stick to the belt unit or rollers and cause jams 
and print quality problems. No adhesive 
should be exposed between the labels. 
Labels should be arranged so that they...

Loading paper and documents
17
2 Unprintable area when 
printing from a computer2
When using the default driver the printable 
area is smaller than the paper size, as shown 
below.
Portrait
 
14.23 mm 
24.23 mm 
Landscape
 
14.23 mm
24.23 mm
Note
The unprintable area shown above is for 
A4 size paper. The unprintable area 
changes with the paper size.
 
Loading paper and 
envelopes
2
The machine can feed paper from the 
standard paper tray, optional lower tray or 
multi-purpose tray.
When printing on...

Chapter 2
18
Loading plain paper in the paper tray2
aUnfold the output paper tray support 
flap (1).
 
bPull the paper tray completely out of the 
machine.
 
cWhile pressing the green paper-guide 
release lever (1), slide the paper guides 
to fit the paper size. Make sure that the 
guides are firmly in the slots. 
 
dFan the stack of paper well to avoid 
paper feeding problems.
 
ePut the paper into the paper tray with the 
top edge of the paper in first and the 
print side face down.
Make sure that the...