Brother Hl 5350dn User Manual

Troubleshooting
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IMPORTANT
 
We recommend that you put the drum unit and toner cartridge assembly on a piece of disposable paper or 
cloth in case you accidentally spill or scatter toner.
 To prevent damage to the printer caused by static electricity, DO NOT touch the electrodes shown in the 
illustration.
 
cClose the front cover.
Note Do not put the drum unit and toner cartridge assembly back in at this point.
 
dPull the paper tray completely out of the printer.
 

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ePull the jammed paper down and out of the printer.
fPush down the blue lock lever and take the toner cartridge out of the drum unit. Clear the jammed paper 
if there is any inside the drum unit.
IMPORTANT
 
Handle the toner cartridge carefully. If toner scatters on your hands or clothes, wipe or wash it off with cold 
water at once.
 To avoid print quality problems, DO NOT touch the shaded parts shown in the illustrations.
 
 

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gPut the toner cartridge back into the drum unit until you hear it lock into place. If you put the cartridge in 
properly, the blue lock lever will lift automatically.
hOpen the front cover. Put the drum unit and toner cartridge assembly back in the printer.
iPut the paper tray firmly back in the printer.
jClose the front cover.
kMake sure that the Paper LED is off and then, the Status LED lights green.
 

Troubleshooting
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Jam Rear / Duplex 7
If a paper jam occurs behind the back cover (back output tray) or inside the duplex tray, the printer will flash 
the Paper LED as shown below.
CAUTION 
After you have just used the printer, some internal parts of the printer will be extremely hot. To prevent 
injury, when you open the front cover or back cover (back output tray) of the printer, DO NOT touch the 
shaded parts shown in the illustration. If you do this, you may get burned.
 
 

Troubleshooting
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Clear the jammed paper as follows. 
aPress the cover release button and then open the front cover.
bSlowly take out the drum unit and toner cartridge assembly. The jammed paper will be pulled out with 
the drum unit and toner cartridge assembly.
IMPORTANT
 
We recommend that you put the drum unit and toner cartridge assembly on a piece of disposable paper or 
cloth in case you accidentally spill or scatter toner.
 To prevent damage to the printer caused by static electricity, DO NOT...

Troubleshooting
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cOpen the back cover.
dPull 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.
CAUTION 
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.
 
1
 

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fPut the drum unit and toner cartridge assembly back in the printer (press firmly).
gFully close the front and back covers.
hPull the duplex tray completely out of the printer.
iPull the the jammed paper out of the printer or the duplex tray.
j Put the duplex tray back in the printer.
kMake sure that the Paper LED is off and then, the Status LED lights green.
 

Troubleshooting
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7
Improving the print quality7
If you have a print quality problem, print a test page first (see Print a test page on page 84). If the printout 
looks good, the problem is probably not the printer. Check the interface cable or try the printer on another 
computer.
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...

Troubleshooting
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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 5.
„The drum unit may be damaged. Put in a new drum unit. See Replacing the drum 
unit on page 101.
All black„Clean the primary corona wire inside the drum...

Troubleshooting
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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 a label stuck on the OPC drum surface.
Clean the drum unit as follows:
7
1) Put the print sample in front of the drum unit, and find the exact position of the 
poor print.
2) Turn the drum unit gear by hand while looking at the surface of the OPC 
drum (1).
3) When you have found the...