Originally Posted by
BLADE
This thread is quite remarkable and unlocks some of the issues with this model. I,ve seen the condition on the sample also after having the pcu out for a few minutes during a call. Wasnt sure what was going on but the copies came good after about 200 copies.
I think that indicates the drums are over sensitive to light.
Are there any old Canon techs here from the NP4835 analog series? Those machines were released with a drum that 'went off' when exposed to outside light (faded patches). But more importantly they suffered 'light fatigue' during normal use from the exposure lamp and that model had a new invention which was a laser to do the lead edge blanking. The drums fell way short of their target. A few months later new drums were issued and the machines ran good.
I reckon the same thing is happenning with this model. The process control aint happy and amps everything up trying to get solids up, so you end up with overtoning, all because of a weak drum. 2 cents worth.
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