Brother Hl 5270dn User Manual

7. Troubleshooting
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d Pull the tabs at the left and right hand sides toward you to open the fuser cover (1). 
eUsing both hands, gently pull the jammed paper out of the fuser unit. 
HOT SURFACE 
After you have just used the printer, some internal parts of the printer will be extremely hot. Wait for the 
printer to cool down before you touch the internal parts of the printer.
 
 
fPut the drum unit and toner cartridge assembly back in the printer (press firmly).
gFully close the front and back...

7. Troubleshooting
 104
JAM DUPLEX (Paper jam in the duplex tray)
 
JAM DUPLEX
If a paper jam occurs inside the duplex tray, follow these steps:
aPull the duplex tray completely out of the printer.
 
bPull the the jammed paper out of the printer or the duplex tray.
 
c Put the duplex tray back in the printer.
 

7. Troubleshooting
 105
Improving the print quality
If you have a print quality problem, print a test page first (see Menu table on page 56). If the printout looks 
good, the problem is probably not the printer. Check the interface cable or try the printer on another PC.
This section gives information on the following topics.
Examples of poor print 
qualityRecommendation
 
Faint„Check the printer’s environment. Conditions such as humidity, high 
temperatures, and so on, may cause this print fault. See...

7. Troubleshooting
 106
 
Hollow print„Make sure that you use paper that meets our specifications. See About paper on 
page 6.
„Choose Thick paper mode in the printer driver, or use thinner paper than what 
you are now using.
„Check the printer’s environment. Conditions such as high humidity can cause 
hollow print. See Positioning the printer on page 4.
 
All black„Clean the primary corona wire inside the drum unit by sliding the blue tab. Be sure 
to return the blue tab to the home position (a). See...

7. Troubleshooting
 107
 
White Spots on black text 
and graphics at 94 mm 
(3.7 in.) intervals
 
Black Spots at 94 mm 
(3.7 in.) intervals„If the problem is not solved after printing a few pages, the drum unit may have 
glue from the label stuck on the OPC drum surface.
Clean the drum unit as follows:
aPut the print sample in front of the drum unit, and find the exact position of 
the poor print.
 
bTurn the drum unit gear by hand while looking at the surface of the OPC 
drum (1).
 
cWhen you have found...

7. Troubleshooting
 108
 
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 80.
„Make sure that you use paper that meets our specifications. See About paper on 
page 6.
„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 on Clean the drum unit 
as follows: on page 107.
„Do not use paper that has clips or staples because they will scratch the...

7. Troubleshooting
 109
 
Curled or wavy„Check the paper type and quality. High temperatures and high humidity will cause 
paper to curl. See About paper on page 6.
„If you do not use the printer often, the paper may have been in the paper tray too 
long. Turn over the stack of paper in the paper tray. Also, fan the paper stack and 
then rotate the paper 180° in the paper tray.
 
Wrinkles or creases„Make sure that the paper is loaded properly. See Printing on plain paper, bond 
paper or transparencies...

7. Troubleshooting
 110
 
Poor Fixing„Open the back cover and make sure that the two blue levers on the left and right 
hand sides are in the down position.
 
Examples of poor print 
qualityRecommendation
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
 

7. Troubleshooting
 111
Solving print problems
ProblemRecommendation
The printer prints unexpectedly 
or it prints garbage data.„Make sure that the printer cable is not too long. We recommend that you use a 
parallel or USB cable that is no longer than 2 meters (6.5 feet).
„Make sure that the printer cable is not damaged or broken.
„If you are using an interface-switching device, remove it. Connect your computer 
directly to your printer, and then try again.
„Make sure that you have chosen the proper...

7. Troubleshooting
 112
Network problems
For problems concerning using your printer on a Network, see the Network User’s Guide on the CD-ROM we 
have supplied.
Other problems
For Macintosh® with USB
Printing from DOS 
ProblemRecommendation
The printer cannot print. The 
‘There was an error writing to 
LPT1: (or BRUSB) for the 
printer’ error message occurs 
on your PC.„Make sure that the printer cable is not damaged or broken. 
„If you have an interface-switching device, make sure that you chose the...