1.1.1. Cyclic white spot/black spot
(1) Symptom
White spot/black spot repeatedly occurs at a certain cycle.
(2) Cause
• Drum unit
Approx. 188mm cycle in a single color
• Developing unit
Approx. 44mm cycle in a single color
• Intermediate transfer belt
Approx. 861mm interval.
• 1
st
transfer roller
Approx 69mm interval
• Opposing roller (?)
Approx 75mm interval
• 2
nd
transfer roller
Approx. 75mm interval.
• Fusing belt
Approx. 311mm interval. On simplex printing, the symptom occurs on 1st side.
3. Solution
After specifying the problem parts, clean and replace the subject parts.
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