Well, the sound does not stop, when I put out any tray. I belive (but I am not sure), that the sound comes near from the gears of the fusing unit.
I hope it is the fuser, but I need your help. Remember, the sound appeared first, while printing, and pringing still worked well, even if the sound is there.
I put out the fuser right now, and tried to check the gears. As I have no experiance with them, here is a picture that you can see for yourselve:
fusergears1.JPG
The gear wheels work well. Only the huge black one cannot be moved, because of that half gear inside. If I move it by hand, and use enough force so that it "moves over" the teeths of that half gear wheel inside, the sound is similar to what I hear when the machine is on and the fuser is installed.
But I do not understand the mechanism. What is the huge black gear from the fusing units right side for? And especially what does that "half gear wheel" inside?
fusergears2.JPG
And finally here is a picture from the gears for the fusing unit from inside the copier. I cannot tell if they look like they should? Regarding the two brown ones, the one in the front can be moved by hand, the other one in the back not at all. Both have a kind of lubricating grease on them.
gears.JPG
Is there perhaps a possibility to turn the copier on completely to see if the sound is gone without the fusing unit installed? So I could see if my theory is right an if it really is the fusing unit, or the waste toner system or something else. Or is it impossible to trick out the sensors?
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