Canon imageRUNNER 2270 Service Manual page 573

Chapter 14
<Note>
If you remove the right door or the drum unit when replacing the fixing assembly and work
with the developing assembly inside the machine, the developing cylinder will remain
exposed and become subjected to dust or other foreign matter. For this reason, it is
important to remove the developing assembly as well as the drum unit when disassembling
and assembling the image formation or fixing system. This, however, does not apply if you
are simply replacing the drum unit.
If you have removed the developing assembly, be sure to place it on a clean sheet of paper
to protect it from dust.
14.2.1.3 Smudged/Streaked
14.2.1.3.1 Stray Toner Along Fine Lines
0007-7083
<Cause>
The moisture held in paper evaporates in response to the heat from the fixing assembly, thus
causing toner to fly astray. This problem tends to occur when paper has low resistance and
in a high temperature/high humidity environment.
<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>
14-15