Brother MFC 9840CDW User Manual

Troubleshooting and routine maintenance
179
C
fHolding the toner cartridges by their 
coloured handles, insert them one by 
one back into the drum unit as shown. 
Make sure that you match the toner 
cartridge colour to the same colour label 
on the drum unit, and make sure that 
you fold down the toner cartridge 
handle (A) once the toner cartridge is in 
place. Repeat this for all the toner 
cartridges.
 
1 C - Cyan
2 M - Magenta
3 Y - Yellow
4K - Black
gPut the drum unit back in the machine as...

180
Note
When you put the drum unit in the 
machine, match the green guides (1) of 
the drum unit handle to the green 
arrows (2) on both sides of the machine.
 
 
2Push the drum unit in until it stops. 
hClose the front cover of the machine. 
When you replace the drum unit with a 
new one, you need to reset the drum 
unit counter by completing the following 
steps:
iTurn on the machine’s power switch.
2
1
2
1
 

Troubleshooting and routine maintenance
181
C
jPress Menu, 8, 4.
Only the parts counters that need to be 
reset appear in the menu.
 
84.Reset Menu
Drum
Selectabor OK
kPress a or b to choose Drum.
Press OK.
lPress 1 to reset the drum unit counter.
mPress Stop/Exit.
Replacing the belt unitC
Order Number: BU-100CL
Change Parts Belt Unit messageC
When the belt unit runs out, the following 
message appears on the LCD. When you see 
this message, you must replace the belt unit:
 
Change Parts
Belt Unit...

182
bHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
cRelease the grey lock lever (1) that is on 
the left side of the machine. Lift the front 
of the drum unit and pull the drum unit 
completely out of the machine using the 
green handles on the drum unit.
 
1
 

Troubleshooting and routine maintenance
183
C
CAUTION 
Make sure that you use the drum unit 
handles when carrying it. DO NOT hold the 
sides of the drum unit.
 
 
 
We recommend that you place the drum 
unit on a flat surface protected by a piece of 
disposable paper or cloth in case of toner 
scatter or spillage.
  
To prevent damage to the machine from 
static electricity, DO NOT touch the 
electrodes shown in the illustration.
 
 
dHold the green parts of the belt unit with 
both hands and lift the...

184
fPut the new belt unit in the machine. 
Match the h mark on the belt unit to the 
g mark on the machine. Push down on 
the green area of the belt unit to lock it in 
place.
 
gPut the drum unit back in the machine as 
follows.
1Make sure that the grey lock 
lever (1) is in the up position and 
put the drum unit in the machine. 
Push down the grey lock lever (1).
1
1
 

Troubleshooting and routine maintenance
185
C
Note
When you put the drum unit in the 
machine, match the green guides (1) of 
the drum unit handle to the green 
arrows (2) on both sides of the machine.
 
   
2Push the drum unit in until it stops. 
hClose the front cover of the machine. 
When you replace the belt unit with a 
new one, you need to reset the belt unit 
counter by completing the following 
steps:
iTurn on the machine’s power switch.
2
1
2
1
 

186
jPress Menu, 8, 4.
Only the parts counters that need to be 
reset appear in the menu.
 
84.Reset Menu
Belt Unit
Selectabor OK
kPress a or b to choose Belt Unit.
Press OK.
lPress 1 to reset the belt unit counter.
mPress Stop/Exit.
Replacing the waste toner 
boxC
Order Number: WT-100CL
Change Parts Waste Toner Box 
message
C
After you have printed approximately 20,000 
images at 5% coverage for CMYK each, you 
must change the waste toner box. The actual 
number of printed pages will vary depending 
on...

Troubleshooting and routine maintenance
187
C
aPress the front cover release button and 
then open the front cover.
 
bHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
 

188
cRelease the grey lock lever (1) that is on 
the left side of the machine. Lift the front 
of the drum unit and pull the drum unit 
completely out of the machine using the 
green handles on the drum unit.
 
CAUTION 
Make sure that you use the drum unit 
handles when carrying it. DO NOT hold the 
sides of the drum unit.
 
 
 
We recommend that you place the drum 
unit on a flat surface protected by a piece of 
disposable paper or cloth in case of toner 
scatter or spillage.
  
If toner scatters on...