Samsung ML-1755 Service Manual page 56

6.6 Periodic Defective Image
If the delinquent image regularly occurs in the printed-paper, it is due to delinquent or damaged roller.
Refer to the table in below and check the condition of the roller.
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
TR
Samsung Electronics
Defective image
75.5mm
37.7mm
37.0mm
35.3mm
45.3mm
64.1mm
75.5mm
6
7
1
Toner Cartridge
DR
2
SR
PTL
MP Sensor
FR
3
4
<Rollers Layout>
ALIGNMENT & A D J U S T M E N T S
white spot on black image
light or dark horizontal image band
horizontal image band
Black spot and image ghost
black spot on the backside
L S U
Toner Cartridge
2
4
1 3
PTL
5
OPC Drum
Charge Roller
Supply Roller
Developing Roller
Typical defect
black spot
image ghost
MP Sensor
5
Tramsfer Roller
6
Heat Roller
7
Pressure Roller
Training Manual
6-13