Technical Bulletin PAGE: 1/2
Model: Model CH-C1 (Office/Pro)
Subject: Vertical bands in halftone images
Prepared by: Ryuuta Chino
From: 1st Tech Service Sect. PP Tech Service Dept.
Mechanical
Paper path
Product Safety
Electrical
Transmit/receive
Other ( )
Service manual revision
Retrofit information
Tier 2
Symptom
Vertical bands of uneven image density appear in halftone images on the rear side of
duplex copies/prints when printing onto coated paper in low-temperature, low-humidity
environments (10°C, 15%).
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.
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