Brother 4750e Intellifax Fax Machine Owners Manual

19 - 10   TROUBLESHOOTING AND ROUTINE MAINTENANCE
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DIFFICULTYSUGGESTIONS
Software Difficulties
“Unable to write to 
LPT1” or “LPT1 
already in use” error 
message appears.1. Make sure the machine is on (plugged into the 
AC outlet) and that it is connected directly to the 
computer using an IEEE-1284 bi-directional 
parallel cable. The cable must not go through 
another peripheral device (such as a Zip Drive, 
External CD-ROM Drive, or Switch box).
2. Make sure the machine’s LCD...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   19 - 11
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DIFFICULTYSUGGESTIONS
Paper Handling Difficulties
The Brother machine 
does not load paper. The 
LCD shows CHECK 
PAPER or PAPER 
JAM.Check to see if the CHECK PAPER or PAPER 
JAM message appears on the LCD. If so, the multi-
purpose sheet feeder may be out of paper or not 
properly installed. If it is empty, load a new stack 
of paper into the feeder. If  there is paper in the 
paper cassette, make sure it is straight. If the...

19 - 12   TROUBLESHOOTING AND ROUTINE MAINTENANCE
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DIFFICULTYSUGGESTIONS
Copy Quality Difficulties
Vertical streaks appear 
in copies.Sometimes you may see vertical streaks on your 
copies. Either the scanner or the primary corona 
wire for printing is dirty. Clean them both.  
(See pages 19-18 to 19-20)
Print Quality Difficulties
Printouts are too dark or 
too light.Adjust the print conditions by setting the Print Density 
setting. It has been factory set to the middle...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   19 - 13
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DIFFICULTYSUGGESTIONS
Print Quality Difficulties (
CONTINUED)
Toner scatters and stains 
the printed page.
Scattering TonerAdjust the print conditions by setting the Print 
Density setting. Remove the drum unit and clean 
the machine’s interior. (See 
Routine Maintenance, 
page 19-18, 
Cleaning the Printer, page 19-18 and 
Cleaning the Drum Unit, page 19-19.) Make sure 
that you use paper that meets specifications. (See 
pages...

19 - 14   TROUBLESHOOTING AND ROUTINE MAINTENANCE
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DIFFICULTYSUGGESTIONS
Print Quality Difficulties (
CONTINUED)
Printed pages are 
blurred at the center or 
at either edge.
Blurred Page
Certain environmental conditions such as humidity 
and high temperatures may cause this condition to 
occur.  Make sure the 
machine is placed on a flat, 
horizontal surface.  Remove the drum unit with the 
toner cartridge installed. Try rocking them from side 
to side.  You may clear a blurred...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   19 - 15
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Packing and Shipping the Machine
Whenever you transport the machine, use the packing materials that came with 
your machine.  Also, follow the steps below to pack the machine so it won’t be 
damaged, which would void the machine’s warranty.
1Remove the telephone line cord and unplug the machine from the AC outlet.
2Open the front cover.
3Remove the drum unit.
Caution
Remove the drum unit and toner 
cartridge assembly.  Leave the...

19 - 16   TROUBLESHOOTING AND ROUTINE MAINTENANCE
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7If you have the Cassette #2 option, carefully pick up the machine and remove 
Cassette #2 to pack it separately.
8Pack additional parts (cord, paper cassette, printed materials) in the carton.
Caution
Be sure to take out any optional memory upgrade boards or network cards 
before packing the machine.
NoteIf you are returing the machine to Brother as part of the Exchange Service, pack 
only the machine. Keep all separate parts...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   19 - 17
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9Close the carton and tape it shut.
Middle 
Layer
Top 
Layer 

19 - 18   TROUBLESHOOTING AND ROUTINE MAINTENANCE
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Routine Maintenance
Keep your machine in optimum condition by cleaning it on a regular basis. It is 
a good idea to clean the drum unit during this routine. Avoid using thinners or 
other organic solvents and do not use water.
Cleaning the Document Scanner
1Unplug the telephone line, and then the power cord.
When you reconnect these lines later, connect the power cord first, and then the 
telephone line. 
2Lift the control panel...

TROUBLESHOOTING AND ROUTINE MAINTENANCE   19 - 19
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WARNING
Just after you have used the machine, some internal parts of the machine are 
extremely HOT!  When you open the front cover of the machine, never touch 
the shaded parts as shown in the diagram below.
3Gently clean the scanner window by wiping with a clean soft dry cloth.  Do not 
use isopropyl alcohol.
Cleaning the Drum Unit
We recommend placing the drum unit on a drop cloth or large disposable paper 
to avoid spilling...