Brother MFC 8420 User Manual

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 29
How to replace the toner cartridge
WARNING
Just after you use the MFC, some internal parts of the machine will 
be extremely HOT! So, never touch the shaded part s shown in t he 
illustration.
1O pen the front cover and pull out the drum unit. 
Caution
■Place the drum unit on a drop cloth or large piece of  disposable 
paper t o avoid spilling and scattering the toner.
■To prevent damage to the MFC from static electricit y, do not 
touch the electrodes...

22 - 30   TROUBLESHOOTING AND ROUTINE MAINTENANCE
2Hold down t he lock lever on t he right  and pull the toner cartridge 
out of the drum unit.
Caution
Handle t he toner cartridge carefully. If toner scatters on your hands 
or clothes, immediately wipe it off or wash it with cold water.
Lo c k  L e v er
 

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 31
3Unpack the new toner cartridge. Place t he used toner cartridge 
into the aluminum bag and discard it according to local 
regulations. 
Caution
■Wait to unpack the toner cartridge unt il immediat ely before you 
install it in t he MFC. If a toner cartridge is left unpacked for a long 
period of time, t he toner life is shortened.
■Brother strongly recommends t hat you do not ref ill the toner 
cartridge provided with your MFC.  We also strongly recommend...

22 - 32   TROUBLESHOOTING AND ROUTINE MAINTENANCE
5Remove the protective cover. 
6Insert the new toner cartridge in the drum unit until it clicks into 
place. If you put it in properly, the lock lever will lift automatically.
7Clean the primary corona wire inside the drum unit by gently 
sliding the blue tab f rom right to left several times. Return the 
blue tab t o the Home position (▼) before reinstalling the drum 
unit  and t oner cartridge assembly.
Toner CartridgeDrum Unit
Corona WireTabHome...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 33
8Reinstall the drum unit and toner cart ridge assembly and close 
t he front cover.
 

22 - 34   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Replacing the drum unit
The MFC uses a drum unit to create print images on paper. If  the 
LCD shows Change Drum Soon, the drum unit  is near the end of 
its life and it is time t o purchase a new one.
Even if the LCD shows Change Drum Soon, you may be able to 
continue printing without having to replace t he drum unit f or a while. 
However,  if there is a noticeable deterioration in the output print  
quality (even before Change Drum Soon appears), then...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 35
Follow these steps to replace the drum unit:
1Press the cover release button and then open the front cover.
2Remove the old drum unit and toner cartridge assembly. Place 
it on a drop cloth or disposable paper to avoid scatt ering toner.
Caution
To prevent  damage to the printer from static elect ricity, do not t ouch 
the electrodes shown below.
 

22 - 36   TROUBLESHOOTING AND ROUTINE MAINTENANCE
3Hold down t he lock lever on t he right  and pull the toner cartridge 
out of the drum unit. (See Replacing the toner cartridge on page 
22-28.)
4Wait to unpack the new drum unit until immediately bef ore 
installing it. Place the old drum unit into the plastic bag and 
discard it according to local regulations.
5Reinstall t he toner cartridge into t he new drum unit. (See 
Replacing the toner cartridge on page 22-28.)
6Reinstall t he new drum unit,...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 37
Checking the drum life
You can see the percent age of the drum’s life that  remains available.
1Press Menu, 2, 0, 2.
2For five seconds, the LCD shows 
t he available percentage of drum 
life.
Page Counter
You can see number of t otal pages, copy pages,  print pages and 
List/Fax (total fax print + total list print) pages that your MFC has 
printed.
1Press Menu, 2, 0, 3.
2The LCD shows number of pages 
for Total and Copy.
Press   to see Print and...

OPTIONAL ACCESSORIES   23 - 1
23
 
Memory board
The memory board is installed on the main controller board inside the 
MFC. When you add the optional memory board, it increases the 
performance for both copier and printer operat ions.
Optional accessories
Model Name Optional Memory
MFC-8420 (32 MB Standard Memory) 32MB   TECHWORKS 12457-0001
MFC-8820D (32 MB Standard Memory) 64MB   TECHWORKS 12458-0001
MFC-8820DN (32 MB Standard Memory) 128MB      TECHWORKS  12459-0001
In general, the DIMM must have the...