Brother MFC-P2000 - B/W Laser Printer Service Manual page 82

Service manual
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I-9
White vertical streaks
<Scanning>
Possible cause
Step
Stains on the
CIS window
CIS unit failure
Dirt on the
document
pressure bar
Scratch on the
document
pressure bar
<Printing>
Possible cause
Step
Laser scanner
window dirty
Transfer failure
I-10
Faulty registration
<Printing>
Possible cause
Step
Excessive paper
load
Print paper
Ditto
Paper registration
sensor position
incorrect
Check
1
Are there any stains on the
CIS window?
2
Is the problem solved after the
CIS unit is replaced?
3
Are there any dirt on the
document pressure bar?
4
Are there any scratches on the
document pressure bar?
Check
1
Is the scanner window dirty?
2
Is the transfer roller scratched?
Check
1
Is the paper loaded in the
paper feeder more than 22 mm
deep?
2
Is the specified weight of the
recommended paper being
used?
3
Is the first printing position
within ±1 mm of the tolerance
specification?
4
Is the position of the paper
registration sensor normal?
Result
Yes
Yes
Yes
Yes
Result
Yes
Yes
Result
Yes
No
Yes
No
IV-13
Remedy
Clean the CIS window.
Replace the CIS unit.
Clean the document pressure
bar.
Replace the document
pressure bar.
Remedy
Clean the scanner window with
a dry tissue.
Replace the drum unit.
Remedy
Instruct the user to keep paper
loads below 22 mm in depth.
Instruct the user to use the
recommended types of paper.
Adjust the Y offset by using the
utility software supplied.
Reposition the sensor to the
correct position.

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