Canon iR3570 Series, Service Manual

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Chapter 14
14-13
F-14-9
<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 cyl-
inder 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.
14.2.1.5 Smudged/Streaked
14.2.1.5.1 Stray Toner Along Fine Lines
0007-7083
iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
<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>