Image Quality Problems And Solutions - Samsung CLP-770ND Service Manual

4.2.4 Image Quality Problems and solutions

If a mark or other printing defects occur at regular intervals down on the page, they may be caused by
damaged or contaminated rollers. Use the table below to find which roller causes the defect from the periods
of the rollers.
If the roller is dirty, try to clean it. If the problem still remains after cleaning, replace the part including the
defective roller.
NO Roller
1 Fuser Belt
2 Pressure roller
3 OPC Drum
4 Deve Roller
5 Supply Roller
6 Transfer Roller
7 PTB Charge roller
Service Manual
Alignment & Troubleshooting
Period (mm)
125.7 Waving, Offset, Spot, Line Burst
91 Offset, Spot, Line Burst
White and Black Spot, Periodic Banding,
75.39
Ghost, Color Registration
36.1 (CMY) White Spot, Horizontal Band
32.6 (K) Offset, Spot, Line Burst
48.2 (CMY)
Periodic Band (by little difference of density)
43.4 (K)
44 White and Black Spot, Periodic Banding
31.4
Yes
4-36
No
Fuser Unit
Fuser Unit
CMYK toner
cartridge
CMY toner cartridge
K toner cartridge
CMY toner cartridge
K toner cartridge
PTB Unit
PTB Unit
Samsung Electronics