We have many HP 8150 Laserjet printers. One prints way too dark on the back of duplexed copies and smudges with toner. It starts out fine on a new job but after a few copies it puts way to much toner on one side of the paper. The toner cartridge can be moved to another machine and it works fine. Is something getting too hot that causes this problem? Is there a cooling fan that isn't working? Is this a fuser problem? Why is the problem only on one side? Changing the light/dark (1-5 setting) doesn't change the problem. Thank you in advance for the help
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