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November 29, 1999
7.1.9 BLACK DOTS/SPOTS
H306T510.WMF
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.
COPY QUALITY TROUBLESHOOTING
Rollers
Registration Roller
OPC Drum
Charge Roller
Development Roller
Transfer Roller
Hot Roller
Pressure Roller
7-9
Diameter
Circumference
(mm)
(mm)
14.24
44.7
30
94.2
14
44.0
20
62.8
16.15
50.7
30.8
96.9
25
78.5
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