Download Canon NP6317 Service Manual
The manual can be downloaded here. I would pay attention to chapter 10. The AE exposure
adjustment may get you where you want to be. Have not touched one of these clam shells
in a long time. Doesn't it have a density control in the front upper shell area? There used to
be a procedure when placing a new drum in the copier to get the bias set up. Cleaning the
charge corona may have put this out of wack,, worth investigating at any rate...
good luck
Mrfixit51
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