Canon imageRUNNER 2270 Service Manual page 575

Chapter 14
14.2.1.3.2 Soiled Image Leading Edge
0007-7089
<Cause>
This problem occurs when paper moves between the photosensitive drum and the transfer
roller. When the photopositive surface comes close to or into contact with the toner-coated
surface of paper, the toner layer can become shifted toward the trailing edge of the paper.
This problem tends to be conspicuous when the toner layer is relatively high against the
width of lines (about 0.2 to 0.6 mm) and, in addition, when the lines are at a right angle to
the feed direction (axial direction of the photosensitive drum).
<Field Remedy>
Use the following service mode item to decrease the developing bias, thus suppressing the
symptom:
COPIER>OPTION>BODY>FIX-SMR
0: default
1: decrease the developing bias by a single step (-20 V)
2: decrease the developing bias by 2 steps (-40 V)
If '2' is selected, the lines can become thinner.
<Image Sample>
14-17