Brother MFC 8420 User Manual

IMPORTANT INFORMATION   21 - 7
13Wait until pages have exited the MFC before picking them up.
14Never push objects of any kind into this product through cabinet 
slots, since they may touch dangerous voltage points or short 
out parts resulting in the risk of fire or electric shock. Never spill 
liquid of any kind on t he product. Do not at tempt to service this 
product yourself because opening or removing covers may 
expose you to dangerous volt age points and other risks and 
may void your warranty....

21 - 8   IMPORTANT INFORMATION
Trademarks
The Brother logo is a regist ered trademark of Brother Industries, Ltd.
Brother is a registered trademark of Brother Industries, Ltd.
Multi-Function Link is a registered trademark of Brother International 
Corporation.
© Copyright 2003 Brother Industries, Ltd. All rights reserved.
Windows, Microsoft and Windows NT are registered t rademarks of 
Microsoft in the U.S.  and other countries.
Macintosh, QuickDraw, iMac and iBook are trademarks or registered...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 1
22
 
Troubleshooting 
Error messages
As with any sophisticated office product, errors may occur. If t his 
happens,  your MFC identifies the problem and displays an error 
message. The most common error messages are shown below.
You can correct most problems by yourself . If you need additional 
help, call the Brother fax back system (USA only).
I n USA onl y: 1-800-521-2846
Troubleshooting and routine 
maintenance
IMPORTANT
For technical help, you must...

22 - 2   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Ch eck  Sc an  
Lo ckThe scanner  lock  is  locked.  Release the scanner lock lever, and 
then press Stop/Exit.
Co mm.  Er ro rPoor phone line quality caused 
communication error. Try the call again. If problem 
continues, call Telephone Company 
to check your phone line.
Co nne cti on  
Fa ilYou tried to pol l a fax machine that is not in 
Polled Waiting mode.Verify the other party’s polling setup.
Co oli ng Do wn
Wa it For  A  
Wh ileThe temperature of...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 3
O ut Of Mem oryYou can’t store data in the memory. (Fax sending in process)
Press Stop and wait until the other 
operations in progress finish and 
then try again.
—OR—
Cle ar  t h e d a t a in  t h e  m e mo r y .  ( S ee  
Out of Memory message on page 
10 - 5 . )
(Copy operation in process)
Press Stop and wait until the other 
operations in process finish and 
then try again.
—OR—
Cle ar  t h e d a t a in  t h e  m e mo r y .  ( S ee  
Out of Memory...

22 - 4   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Original jams
Based upon where the original is jammed, follow the appropriate set 
of instructions to remove it.
Original is jammed in the top of the ADF unit.
1Take out any paper from 
the ADF that is not 
jammed.
2Lift the ADF cover.
3Pull the jammed original 
out to the right.
4Close the ADF cover.
5Press Stop/Exit.
Pa per  Ja mThe paper is jammed in the MFC. See Paper jams on page 22-6 or 
Paper is jammed in the duplex tray 
(For MFC-8820D and...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 5
Original is jammed inside the ADF unit.
1Take out any paper f rom 
t he ADF that is not 
jammed.
2Lift the document cover.
3Pull t he jammed original 
out to the right.
4Close the document 
cover.
5Press Stop/Exit.
—OR—
1Take t he ADF support out of  the ADF unit.
2Pull the jammed original out  to the right .
3Press Stop/Exit.
 

22 - 6   TROUBLESHOOTING AND ROUTINE MAINTENANCE
Paper jams
To clear paper jams, please follow the steps in this section.
WARNING
Af ter you have just used the MFC, some parts inside the MFC are 
extremely hot. When you open the front cover or back output tray of 
the MFC, never touch the shaded parts shown in the f ollowing 
diagram.
Clear the jammed paper as follows. 
If the jammed paper is removed completely by using t he inf ormation 
in the following steps, you can install the paper tray first, and...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   22 - 7
1Pull the paper tray completely out  of the MFC.
2Pull the jammed paper up and out of the MFC.
3Press the cover release button and then open the front cover.
4Pull out the drum unit assembly. Pull the jammed paper up and 
out of the MFC. If you cannot remove the drum unit  assembly 
easily at this time, do not use extra force. I nstead, pull the edge 
of the jammed paper from the paper tray.
 

22 - 8   TROUBLESHOOTING AND ROUTINE MAINTENANCE
WARNING
To prevent damage t o the MFC caused by st atic electricity,  do not 
touch the electrodes shown in the following diagram.
5Open the back output tray. Pull the jammed paper out of the 
fuser unit . If the paper jam can be cleared, go to St ep 7. 
If you have to pull t he paper t oward t he back of the MFC, the 
fuser may get dirty wit h toner powder and it may scatter on the 
next print outs. Print a few copies of the test page until the 
scatt...