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The Toner end message can have more than one cause; You will use some SP modes to identify your pb.
SP 3100 to disable temporally the message and allows you to run the machine to investigate.
SP...

Sc142 White level detection error. optical section. Sc202 Polygon mirror motor error. Laser section. Sc490 Main fan motor error. Engine section.
When you have different sc in different sections...

Thank you

it could be the SP 5074

It 's a SP mode which was changed, I've had that once but i can't remember which SPmode, sorry. I'll have a look on monday .

The message is it " Remove paper from shift tray because it's full " or remove a paper jam.
Try to exit the paper on the superior tray to see if it works.

First you need to know where you are loosing the density. Make a copy or a print and open the door while it's running .have a look on the ITB if you have the same pb; IF the image is ok on the ITB...

The idea came from Mark Bbb, the post before yours; I didn't want to offense Mark Bbb or people like you who runs the website and the forum for many years,
helping thousand of people solving their...

About the idea door switches (oxidation on contacts) because "at power on" it would do it during the day.

I would think the power supply unit, because at power on , and it does the something with...

On the SMC is it reported jam in location 3 first paper feed or power on jam or something else. Did you get the same pb with the others trays?
Imagine it does the jam only on the first tray (for...

I would try to switches OFF/ON with the first drawer opened, then close it when the machine is ready to see.

Hi,

Just unscrew a little bit the charge on the black PCU to get no charge on the drum, this will normaly make a black copy .Or stop the copying by opening the front door, and have a look on the...