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copies keep getting lighter on 4112

Product Name: Other - specify product in post

I have a 4112 machine. The copy quality keeps getting lighter. When the technician comes out, he replaces the developer and makes adjustments on the machine. The fix works for about 24-48 hours, then the copies get lighter and lighter. Are there any sensors that could be the problem? I really hate having to call every couple of weeks so any help would be great.

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