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 shown below.
HOT!
 
						

							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 
that you continue to use only Genuine Brother Brand 
replacement toner cartridges (TN-530 or TN-560). Using or 
att empting to use potentially incompatible toner and/or toner 
cartridges in your MFC may cause damage to the machine itself 
and/or it  may result in unsatisfactory print quality. Our warrant y 
coverage does not apply to any problem that was caused by t he 
use of unauthorized third party toner and toner cartridges. To 
protect your investment  and guarantee your print quality please 
continue to replace consumed toner cartridges with only Genuine 
Brother Branded Supplies.
4G ently rock the toner cartridge from side to side five or six times 
t o distribute the toner evenly inside the cartridge.
 
						

							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 Position(▼)
 
						

							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 the drum 
unit should be replaced. You should clean the MFC when you 
replace the drum unit. (See Cleaning the drum unit on page 22-27.)
Caution
When removing the drum unit, handle it  carefully because it contains 
toner. If t oner scatters and your hands or clothes get dirty, 
immediately wipe or wash with cold water. 
WARNING
Just af ter you have used the MFC, some internal part s of the MFC 
are extremely HOT! So please be careful.
The drum unit is a consumable item, and it is necessary t o 
replace it periodically. There are many factors that determine 
the actual drum lif e, such as temperat ure, humidity, t ype of 
paper and how much toner you use for the number of pages per 
print job. The estimated drum life is up to 20,000 pages. The 
actual number of pages your drum will print may be significantly 
less than these estimates. Because we have no control over the 
many factors that determine the act ual drum life, we cannot  
guarantee a minimum number of pages that will be printed by 
your drum.
HOT!
 
						

							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, keeping t he front cover open.
7Press Clear/Back.
8Press 1 and when the LCD shows 
Accepted, and close the front  
cover.
Caution
If toner scat ters and your hands or clothes get dirty,  immediately 
wipe off or wash with cold water.
Discard the used drum unit according to local regulations, 
keeping it separat e from domestic waste. Be sure t o seal the 
drum unit tightly so toner powder does not spill out of the unit. If 
you have questions,  call your local waste disposal off ice.
Lock Lever
Replace Drum
▲1.Yes▼2.No
Select ▲▼ & Set
 
						

							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 
List/Fax.
3Press Stop/Exit.
Even if  the remaining drum life is 0%, you may continue to use 
t he drum unit until you have a print  quality problem.
20.Miscellaneous
2.Drum Life
Remaining:100%
20.Miscellaneous
3.Page Counter
▲Total   :123456▼Copy    :120002
 
						

							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 following specifications:
Type: 100 pin and 32 bit output
CAS Lantency: 2 or 3
Clock Frequency: 100MHz or more
Capacity: 32,  64, 128MB
Height: 35mm (1.4 inches) or less
Parity: NONE
DRAM Type: SDRAM 4 Bank
Some DIMMs might not work with this MFC. For the latest 
information from Brother visit:
http://solutions.brother.com