Brother International HL-720 Service Manual - Page 70

White vertical streaks, Faulty registration, recommended paper being used?

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I-9 White vertical streaks Possible cause Scanner soiling Transfer failure Step 1 2 Check Is the window of the laser scanner soiled? Is the transfer roller scratched? Result Yes Yes Remedy Clean the window with a dry tissue. Replace the drum unit. I-10 Faulty registration Possible cause Excessive paper load Step 1 Check Is the amount of paper loaded to the paper tray more than 22mm thick? Printer paper 2 Is the specified weight of the recommended paper being used? Ditto Top of form sensor position failure 3 Is the first printing position within ± 1mm of the tolerance specification? 4 Is the position of the top of form sensor normal? Result Yes No Yes No Remedy Instruct the user to keep paper loads below 22mm in thickness. 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 normal position.

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I-9
White vertical streaks
Possible cause
Step
Check
Result
Remedy
Scanner soiling
1
Is the window of the laser scanner
soiled?
Yes
Clean the window
with a dry tissue.
Transfer failure
2
Is the transfer roller scratched?
Yes
Replace the drum
unit.
I-10
Faulty registration
Possible cause
Step
Check
Result
Remedy
Excessive
paper load
1
Is the amount of paper loaded to
the paper tray more than 22mm
thick?
Yes
Instruct the user to
keep paper loads
below 22mm in
thickness.
Printer paper
2
Is the specified weight of the
recommended paper being used?
No
Instruct the user to
use the
recommended types
of paper.
Ditto
3
Is the first printing position within ±
1mm of the tolerance specification?
Yes
Adjust the Y offset by
using the utility
software supplied.
Top of form
sensor position
failure
4
Is the position of the top of form
sensor normal?
No
Reposition the
sensor to the normal
position.