Brother MFC 9120CN User Manual

Troubleshooting and routine maintenance169
C
bFully open the top cover by lifting up on 
the handle (1).
 
IMPORTANT
When the scanner is open, you cannot 
open the top cover.
 
cTake out the drum unit and toner 
cartridge assembly for the colour shown 
on the LCD.
 
dPush down the green-labelled lock 
lever (1) and take the toner cartridge out 
of the drum unit.
 
WARNING 
DO NOT put a toner cartridge into a fire. It 
could explode, resulting in injuries.
  
DO NOT use cleaning materials that 
contain...

170
IMPORTANT
• We recommend that you place the drum unit and toner cartridge assembly on a 
clean, flat, level, stable surface with a 
sheet of disposable paper or cloth 
underneath it in case you accidentally spill 
or scatter toner.
• To prevent damage to the machine from  static electricity, DO NOT touch the 
electrodes shown in the illustration.
 
• Handle the toner cartridge carefully. If toner scatters on your hands or clothes, 
wipe or wash it off with cold water at once.
• To avoid print...

Troubleshooting and routine maintenance171
C
fUnpack the new toner cartridge. Gently 
shake it from side to side several times 
to distribute the toner evenly inside the 
cartridge.
 
IMPORTANT
• Unpack the toner cartridge just before you put it in the machine. If a toner cartridge is 
left unpacked for a long time, the toner life 
will be shortened.
• If an unpacked drum unit is put in direct  sunlight or room light, the unit may be 
damaged.
 
CAUTION 
HOT SURFACE
Put the toner cartridge in the drum...

172
hPut the new toner cartridge firmly into 
the drum unit until you hear it lock into 
place. 
Note
Make sure that you put in the toner 
cartridge correctly or it may separate from 
the drum unit.
 
iSlide the drum unit and toner cartridge 
assembly into the machine. Make sure 
that you match the toner cartridge colour 
to the same colour label on the machine. 
 
 
C-Cyan M-Magenta Y-Yellow K-Black
jClose the top cover of the machine. 
 
h
 
K
Y
M C
 

Troubleshooting and routine maintenance173
C
kPlug the machine’s power cord back into 
the electrical socket first, and reconnect 
all cables and the telephone line cord. 
Turn on the machine.
Note
DO NOT turn off the machine or open the 
top cover until the LCD returns to the 
Ready mode.
 
IMPORTANT
While removing the drum unit, handle it 
carefully because it may contain toner. If 
toner scatters on your hands or clothes, 
wipe or wash it off with cold water at once.
 
Drum unitsC
A new drum kit...

174
Replace Drums messagesC
When the following message appears on the 
LCD, you need to replace the drum kit:
 
Replace Drums
 
Drum Error
1Only the colour you need to replace will be shown
The Drum Error message has two cases: If 
the scrolling message shows 
Replace the Drum Unit. you will need 
to replace the drum unit. If the scrolling 
message shows 
Slide the Green tab on Drum Unit.  
you do not need to replace the drum unit, you 
just need to clean the corona wires. (See 
Cleaning the corona...

Troubleshooting and routine maintenance175
C
IMPORTANT
When the scanner is open, you cannot 
open the top cover.
 
cTake out the drum unit and toner 
cartridge assembly for the colour shown 
on the LCD.
 
dPush down the green-labeled lock 
lever (1) and take the toner cartridge out 
of the drum unit.
 
WARNING 
DO NOT put a toner cartridge into a fire. It 
could explode, resulting in injuries.
 
 
DO NOT use cleaning materials that 
contain ammonia, alcohol, any type of 
spray, or any type of flammable...

176
• To avoid print quality problems, DO NOT touch the shaded parts shown in the 
illustrations.
 
 
 
 
Note
• Be sure to seal up the toner cartridge tightly in a suitable bag so that toner 
powder does not spill out of the cartridge.
• Discard used consumable items  according to local regulations. If you 
choose not to return your used 
consumable, please discard the used 
consumable according to local 
regulations, keeping it separate from 
domestic waste. If you have questions, 
call your local...

Troubleshooting and routine maintenance177
C
gSlide the drum unit and toner cartridge 
assembly into the machine. Make sure 
that you match the toner cartridge colour 
to the same colour label on the machine. 
 
 
C-Cyan M-Magenta Y-Yellow K-Black
hClose the top cover of the machine.
Resetting the drum counterC
When you replace a drum unit with a new 
one, you need to reset the drum counter by 
completing the following steps:
aPlug the machine’s power cord back into 
the electrical socket first, and...

178
aTurn off the machine. Unplug the 
telephone line cord first, and then 
unplug the power cord from the 
electrical socket.
bFully open the top cover by lifting up on 
the handle (1).
 
IMPORTANT
When the scanner is open, you cannot 
open the top cover.
 
cTake out all the drum unit and toner 
cartridge assemblies.
 
IMPORTANT
• We recommend that you place the drum unit and toner cartridge assembly on a 
clean, flat surface with a sheet of 
disposable paper or cloth underneath it in 
case you...