Brother International HL 1240 Service Manual - Page 143

Image distortion, Faint print

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I-13 Image distortion CHAPTER 6 TROUBLESHOOTING Possible cause Laser unit installation Scanner LD emission failure Scanner motor rotation failure Scanner connection failure Step Check 1 Is the laser unit secured to the frame incorrectly? (Check if there is any play.) 2 Is the laser diode or the scanner motor defective? 3 Is the scanner harness connected properly? (Check if it is coming loose.) Result Remedy Yes Secure the unit correctly and tighten the screws. Yes Replace the laser unit. No Connect the harness correctly. Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o I-14 Faint print Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Possible cause Printer installation Toner cartridge Scanner window dirty Laser unit failure Step 1 2 3 4 Check Is the printer placed horizontally? Does the problem happened immediately after replacing the toner cartridge with a new one? Is the scanner window dirty? Is the problem solved by replacing the laser unit? Result Remedy No Place the printer on a flat surface. Yes Remove and carefully shake the toner cartridge horizontally. Yes Clean the scanner window with a soft dry cloth. Yes Replace the laser unit. 6-33

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CHAPTER 6
TROUBLESHOOTING
6-33
I-13
Image distortion
Possible cause
Step
Check
Result
Remedy
Laser unit
installation
1
Is the laser unit secured to the
frame incorrectly?
(Check if there is any play.)
Yes
Secure the unit correctly and
tighten the screws.
Scanner LD
emission failure
Scanner motor
rotation failure
2
Is the laser diode or the
scanner motor defective?
Yes
Replace the laser unit.
Scanner
connection
failure
3
Is the scanner harness
connected properly?
(Check if it is coming loose.)
No
Connect the harness correctly.
I-14
Faint print
Print out test
print out test
print out test
Print out test
print o
Print out test
print o
Print out test
print out test
print out test
Print out test
print o
Print out test
print o
Print out test
print out test
print out test
Print out test
print o
Print out test
print o
Print out test
print out test
print out test
Print out test
print o
Print out test
print o
Print out test
print out test
print out test
Print out test
print o
Print out test
print o
Print out test
print out test
print out test
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Print out test
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Print out test
print out test
print out test
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Print out test
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Print out test
print out test
print out test
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Print out test
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Print out test
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Print out test
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print out test
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Print out test
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print out test
print out test
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print out test
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Print out test
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Print out test
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print out test
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Possible cause
Step
Check
Result
Remedy
Printer
installation
1
Is the printer placed
horizontally?
No
Place the printer on a flat
surface.
Toner cartridge
2
Does the problem happened
immediately after replacing the
toner cartridge with a new
one?
Yes
Remove and carefully shake the
toner cartridge horizontally.
Scanner window
dirty
3
Is the scanner window dirty?
Yes
Clean the scanner window with
a soft dry cloth.
Laser unit failure
4
Is the problem solved by
replacing the laser unit?
Yes
Replace the laser unit.