November 29, 1999
COPY QUALITY TROUBLESHOOTING
7-9
Trouble-
shooting
7.1.9 BLACK DOTS/SPOTS
Possible Cause (Scanner)
•
Dust on the exposure glass.
Action:
•
Clean the exposure glass.
•
Try disabling MTF.
Possible Cause (Printer)
•
The surface of a roller is damaged or dirty (See the table above)
Action:
•
Clean the rollers
•
Replace the rollers if necessary.
H306T510.WMF
Rollers
Diameter
(mm)
Circumference
(mm)
Registration Roller
14.24
44.7
OPC Drum
30
94.2
Charge Roller
14
44.0
Development Roller
20
62.8
Transfer Roller
16.15
50.7
Hot Roller
30.8
96.9
Pressure Roller
25
78.5