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USB: Ensures that the USB connection from your computer to the HP product is working correctly.
Ensures that the network connection between your computer and your
network is working correctly. If the tool detects a network connectivity
problem, you will be prompted to run the HP Network Diagnostic Utility
for better results.
: Automatically restarts the print spooler, which sends print jobs from the computer to the product, if it has been stopped.
: Checks if the product has been paused or set to offline, and then sets the status back to online if necessary.
: Checks for problems in Device Manager that would prevent printing.
: Checks for and clears pending print jobs in the print queue (a log of print jobs waiting to print).
: Checks the port settings for the HP product.
: Checks for alternate-driver settings.
: Checks for conflicts with other drivers, such as other printer brands.
: Checks the default printer setting and prompts to select the HP product as default (optional).
The first thing you must check is the small scanner glass,this is the narrow glass that the machine is using when you use the dockfeeder,clean that glass and make sure there is no back dots on the glass.Even a small dot can cause lines on your page.But this lines will only be sen if you using the docfeeder.
The second probem can be the drum cartridge that is faulty.With this problem all your copies and printed pages will have lines.
If your drum is ok,the next thing that goes wrong is the fixing assy.
Replace the drum. The drum is failing.
When you replace the drum open the front door of the machine where thr drum and toner is.
Hit the clear/back button. Press 1
That resets the drum count after you replaced the unit.
Ist I take it you have replace the toner/drum. If not do so. If you have then check the paper path to make sure there is nothing in the way, like a torn piece of paper or a label stuck in there? If you are 100% positive the paper path is clear there maybe something stuck in the fusing unit.
On a Dell3100cn changing the paper setting to covers2 helps.
Here is how I understand the problem:
The heating element does not always get hot enough and the toner gets smeared before is is fixed (in the photographic sense). Changing the paper type to covers2 increase the temp of the heating element eliminating the smearing.