Ricoh MP C6502SP Field Service Manual page 1440

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5. Troubleshooting
1: Approximately 30mm
2: Approximately 50mm
[A]: Bands of low density (at approx. 30-50mm from center)
[B]: Density is relatively high at ends of bands
Cause
Friction between the paper and registration roller generates an electrical charge on some areas of
the paper, after the paper has passed through the fusing unit to fuse the first side. The areas on the
paper are charged differently, and these differences are visible as bands.
Solution
Lower the PTR bias for the second side.
D137/D138:
• The user can use the IMSS settings to lower the bias.
• If the symptom occurs in full-color mode, use [PTR Bias:FC:Side2: Custom Paper 001 to 100]
(2-814-001 to 100).
• If the symptom occurs in B/W mode, use [PTR Bias:BW:Side2: Custom Paper 001 to 100]
(2-812-001 to 100).
• When using plain paper, the setting can be changed using 2-652-012 to 028 (for each
paper thickness and type) and 2-642-012 to 028 (for each paper thickness and type).
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