On e Studio 853, I was getting grainy light images like undertoning, but the developer was at less than 1/2 yield. It's a fairly dusty location, and I've cleaned laser slit glass and/or laser optics before on other machines at this location, so I started there first.
Here is where it gets interesting. When I booted up, the machine went into an add toner cycle for nearly 2 minutes. The resulting images were nicely toned.
I've dealt with potential control issues before with Canons. I do know that potential control often regulates developer bias, primary charge, transfer charge, separation charge, toner density, laser intensity.
So here's the question: What does a dirty laser slit glass have to do with toner density? =^..^=
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