Brother MFC-P2000 - B/W Laser Printer Service Manual page 81

I-7 Black and blurred horizontal stripes
<Printing>
Possible cause Step
Scratch on the
drum
Toner stuck on
the developer
roller
Scratch on the
fixing roller
High-voltage
power supply
PCB
I-8 Black vertical streaks (in a gray background)
<Scanning>
Possible cause Step
Stains on the
CIS window
CIS unit failure
<Printing>
Possible cause Step
Translucent
stain on the
laser scanner
window
Check
1 Are the horizontal stripes at 94
mm (photosensitive drum)
intervals?
2 Are the horizontal stripes at 25
mm (developer roller)
intervals?
3 Are the horizontal streaks at 63
mm (heat roller) intervals?
4 Is the problem solved after the
high-voltage power supply
PCB is replaced?
Check
1 Are there any stains on the
CIS window?
2 Is the problem solved after the
CIS unit is replaced?
Check
1 Are there any stains on the
laser scanner window?
Result
Yes
Yes
Yes
Yes
Result
Yes
Yes
Result
Yes
IV-12
Remedy
Replace the drum unit.
Print several sheet and see
what happens.
The problem will disappear
after a while. If not, replace the
drum unit.
Replace the fixing unit.
Replace the high-voltage
power supply PCB.
Remedy
Clean the CIS window.
Replace the CIS unit.
Remedy
Clean the laser scanner
window.
If it is not effective, replace the
laser unit.