Brother Laserprinter Hl 1270n User Guide

CHAPTER 4 TROUBLESHOOTING
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Other
Problem Recommendation
The printer cannot print.
“There was an error writing to
LPT1: (or BRUSB) for the
printer.” error message appears
on your PC.· Check that the printer cable is not damaged or broken.
· If you have an interface switching device, make sure the correct
printer is selected.
For DOS users
Problem Recommendation
Unable to print from
application software.· Check that the DOS application software interface settings
match that of your printer :  for...

4-16
Unable to print from
For iMac and Power Macintosh G3 with USB
This printer does not appear in
Unable to print from 

CHAPTER 4 TROUBLESHOOTING
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Improving the print quality
! Caution
If the Drum LED is lit you can clear a print quality problem by replacing  the drum unit with
a new one.  The Drum LED indicates that the drum unit is at the end of life.
This section provides information on the following topics:
Image defect
 examples Recommendation
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
CDEF
d
efg
BC
b
cd
23
Faint
· Check the printers environment. Conditions such as high
humidity, high temperatures, etc. may cause this...

4-18
Image defect examples Recommendation
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
Toner specks
· Make sure that you use paper that meets the specifications. A
rough surfaced paper may cause the problem.  See “What kind
of paper can I use” in Chapter 1.
· The drum unit may be damaged.  Install a new drum unit.  See
How to replace the Drum unit in Chapter 3.
Hollow print
· Make sure you use paper that meets the specifications.   See
“What kind of paper can I use” in Chapter 1.
· Select the ‘Thick paper mode’...

CHAPTER 4 TROUBLESHOOTING
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Image defect examples Recommendation
94 mm
(3.7 in.)
94 mm
(3.7 in.)
White Spots
Printed pages have white spots in
black text and graphics at intervals
of 94 mm.
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Black Spots
Printed pages have black spots at
intervals of 94 mm.
· If the problem is not solved after printing a few pages, the drum
unit may have glue from label stock on the OPC drum surface.
 Clean the drum unit as follows
 
  1. Position the print sample in front of the drum...

4-20
Image defect examples Recommendation
94 mm
(3.7 in.)
94 mm
(3.7 in.)
White Spots
Printed pages have white spots in
black text and graphics at intervals
of 94 mm.
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Printed pages have black spots at
intervals of 94 mm.
!Caution
Do not try to clean the surface of the photosensitive drum with
anything sharp such as a ball-point pen etc.
 
 
· 
· ·  · The drum unit may be damaged.  Install a new drum unit.  See
“How to replace the Drum unit” in Chapter 3. 

CHAPTER 4 TROUBLESHOOTING
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Image defect examples Recommendation
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
Black Horizontal repetitive
defects
Toner scatters and stains the
printed page.
· The drum unit may be damaged.  Install a new drum unit.  See
How to replace the Drum unit in Chapter 3.  
· Make sure you use paper that meets specifications.  See “What
kind of paper can I use” in Chapter 1.
2 Note
· If you use label sheets for laser printers, the glue from the sheets
may sometimes stick to the OPC...

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.
ABCDEFGH
White Vertical streaks
ABCDEFGH
Page skew
Curl or wave
BDEFGH
Wrinkles or creases 

CHAPTER 4 TROUBLESHOOTING
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How to print correctly
Problem Recommendation
The printer prints unexpectedly
or it prints garbage data.· Make sure the printer cable is not too long.  We recommend
using a parallel cable of less than 2 metres (6.6 feet) in length.
· Check if the printer cable is damaged or broken.
· If you are using an interface switching device, remove it and
connect your computer directly to your printer, then try again.
· Check that the appropriate printer driver is selected for ‘Set...

4-24
The printer prints, but it prints