HP Color Laserjet 4600dn fan problem

Hello,
can anybody tell me what I can do that the loud fan which is running in idle time will shut off early? I already set power save mode to one minute, which results in switching off the backlight and dropping the total power consumption from 31.2W to 30.5W - but only after a full hour the top left fan gets switched off (and turned on again at printing - not by leaving power save mode). In that case power drops to 26.7W.
Any ideas welcome!
wolfgang

Hello again!
I SOLVED IT !
Who ever, when ever will have the same issue, here's how i fixed it (sorry for my not so correct english):
I googeled around a bit more, and found a topic in some forum:
http://www.fixyourownprinter.com/forums/printer/68382
http://www.fixyourownprinter.com/forums/printer/63372#1
And then i saw a video in here:
https://www.youtube.com/watch?v=9BoxmagIjhg
What i did:
Took the printer apart. All the plastic covers. I think i only had to take 2 screws out, to cet the covers. I only didn't take down the cover where you can put paper in, i didn't need to.
The cover where you put colors inside was tricki. The lid communicates with other pinions, so you'll have to remove it. To remove it, there is this little black pinion inside the printer. In the center of the pinion, there is a buttonish thing, you'll have to push it to the side ways, from center to edge to remove the pinion and then you'll be able to remove the top plastic cover.
Then i did as it's shown in the video:
https://www.youtube.com/watch?v=9BoxmagIjhg
You'll have to clean this "solenoid" thing. I used a little knife to scratch off the clue from both pieces. There was supposed to be a felt, but mine didn't have it anymore, and THAT was wat was caousing it. 
IMPORTANT: My felt from the solenoid was cone, so i replaced it with masking tape. I  cut a little strips out off of a masking tape and clued/wrapped it around the solenoid. It is recommended though, that you clue a little felt back in there, but i didn't have it, so i used masking tape.
Then i put all the pieces back together and it worked ! 
You cant believe my happiness, when it started to print every paper correctly. I had this problem for a while,  and unbelievably this worked. 
If you have the same problem, i hope this trick will solve yours too.

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