Samsung ML-2250/XBG Service Manual page 73

Alignment & Adjustments
6.7 Periodic Defective Image
If a mark or other printing defect occurs at regular intervals down the page it may be caused by a damaged
or contaminated roller. Measure the repetition interval and refer to the table below to identify the roller
concerned.
No Roller
1 OPC Drum
2 Charge Roller
3 Supply Roller
4 Developing Roller
5 Transfer Roller
6 Heat Roller
7 Pressure Roller
Fuser
L S U
Fuser
CR
OPC
PR
EXIT
Sensor
TR
Empty Sensor
Service Manual
6-14
Defective image
75.5mm
37.7mm
44.9mm
35.3mm
47.1mm
75.5mm
6
7
Toner Cartridge
DR
SR
FR
white spot on black image or black spot
78mm
L S U
2
4
1
PTL
5
1
OPC Drum
2
Charge Roller
3
Supply Roller
4
Developing Roller
<Rollers Layout>
Typical defect
black spot
light or dark horizontal image band
horizontal image band
image ghost
Black spot and image ghost
black spot on the backside
Toner Cartridge
3
MP Sensor
5
Transfer Roller
6
Heat Roller
7
Pressure Roller
Samsung Electronics