Brother MFC 8440 User Manual

TROUBLESHOOTING AND ROUTINE MAINTENANCE   12 - 20
Black toner marks across 
the page The drum unit may be damaged. Put in a new drum unit. (See 
Replacing 
the drum unit  on page 12-34.)
Make sure that you use paper that meets our specifications. (See  About 
paper  on page 2-1.)
If you use label sheets for laser printers, the glue from the sheets may 
sometimes stick to the OPC drum surface. Clean the drum unit. 
(See  Cleaning the drum unit  on page 12-27.)
Do not use paper that has clips or staples...

12 - 21   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Wrinkles or creases Make sure that paper is loaded properly.
Check the paper type and quality. (See 
About paper on page 2-1.)
Try printing using the straight-through output path. (See  How to load 
paper  on page 2-5.)
Turn over the stack of paper in the tray or try rotating the paper 180° in 
the input tray.
The drum unit is a consumable item and it is necessary to 
replace it periodically.
Examples of poor print 
qualityRecommendation
B DEFGH
abc...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   12 - 22
Packing and shipping the MFC
Whenever you transport the MFC, use the packing materials that 
came with your machine. If you do not pack the MFC correctly, you 
may void your warranty.
1Turn the MFC power switch off.
2Unplug the MFC from the telephone wall jack.
3Unplug the MFC from the AC outlet.
Lock the Scanner Lock
4Push the Scanner Lock Lever down to lock the scanner. This 
lever is located on the left of the scanner glass.
Caution
Damage caused to...

12 - 23   TROUBLESHOOTING AND ROUTINE MAINTENANCE
6Remove the drum unit and toner cartridge assembly. Leave the 
toner cartridge installed in the drum unit.
7Place the drum unit and toner 
cartridge assembly into the plastic bag 
and seal the bag.
8Close the front cover. Fold down the face-down output tray flap. 
Remove the telephone line cord.
9Wrap the MFC in the plastic bag 
and place it in the original carton 
with the original packing material.
 

TROUBLESHOOTING AND ROUTINE MAINTENANCE   12 - 24
10Pack the drum unit and toner cartridge assembly, telephone line 
cord, AC cord and printed materials in the original carton as 
shown below: 
11Close the carton and tape it shut.
If you are returning the MFC to Brother as part of the Exchange 
Service, pack only the MFC. Keep all separate parts to use with 
your ‘Exchange’ machine.
 

12 - 25   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Routine maintenance
Cleaning the scanner
Turn the MFC power switch off and lift the document cover. Clean the 
scanner glass and glass strip with dry cloth and the white film with 
isopropyl alcohol on a lint free cloth.
If the screen  still displays a scanner error, call Brother Customer 
Service for assistance at 1-800-284-4329 ( in USA) or 
1-877-BROTHER ( in Canada).
White Film
Document Cover
Glass strip
White film
 

TROUBLESHOOTING AND ROUTINE MAINTENANCE   12 - 26
Cleaning the printer
Caution
■Do not use isopropyl alcohol to remove dirt from the control 
panel. It may crack the panel.
■ Do not use isopropyl alcohol to clean the laser scanner window.
■ Do not touch the scanner window with your finger.
■ The drum unit contains toner, so handle it carefully. If toner 
scatters and your hands or clothes get dirty, immediately wipe or 
wash it off with cold water.
1Turn the MFC power switch off and open the front...

12 - 27   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Cleaning the drum unit
We recommend placing the drum unit and toner cartridge assembly 
on a cloth or large disposable paper to avoid spilling and scattering 
toner.
1Clean the primary corona wire inside the drum unit by gently 
sliding the blue tab from right to left several times.
2Return the blue tab and snap it into the Home position ( ▼). 
Caution
If the blue tab is not at Home position ( ▼), printed pages may have 
vertical stripes.
3Reinstall the...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   12 - 28
Replacing the toner cartridge
The MFC can print up to 6,700 pages using a  high yield toner 
cartridge. When the toner cartridge is running low, the LCD shows 
Toner Low . The MFC is supplied with a  standard toner cartridge 
that must be replaced after approximately 3,500 pages. Actual page 
count will vary depending on your average type of original (i.e., 
standard letter, detailed graphics).
Discard the used toner cartridge according to local...

12 - 29   TROUBLESHOOTING AND ROUTINE MAINTENANCE
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 parts shown in the 
illustration.
1Open the front cover and pull out the drum unit. 
Caution
■ Place the drum unit on a drop cloth or large piece of disposable 
paper to avoid spilling and scattering the toner.
■ To prevent damage to the MFC from static electricity, do not 
touch the electrodes...