m750 printing lines on pages

[dlmstitch]

My M750 color laserjet is printing horizontal lines in color & B&W. I have printed ~ 10,000 heavy (60 - 80 # paper) since 7/2014.  Cartridges are new with only ~1000 pages.  Could it be the fuser?

[tonerspills]

Most likely it is going to be the fuser or image transfer belt. Either the fuser has worn out due to printing a heavier paper, or the cleaning blade on the image transfer belt has fouled, preventing the removal of waste toner.

Waste toner from a fouled cleaning blade is usually a brownish color and will look more like a smear down the paper. A bad fuser, bad cartridge, or problem with the transfer roller will usually be a much better defined line. Attaching a photo may help troubleshooting. Also, a bad cartridge can cause a repeating image defect.

The old school way is to just run a few internal test reports and  open the right door causing the printer to jam. You can then see if the line is present before it enters the fuser.

I believe this printer has a print stop test which can be accessed via the troublshooting or diagnostics menu in the administration section. There you can enter a time and the printer will begin feeding paper and stop at the predetermined time, usually just a trial and error in miliseconds to get it past the tranfer area so you can see if its occuring there, or at the fuser.

[tonerspills]

Admin/Troubleshooting/Diagnostic Tests

Print/stop test

Use this diagnostic test to isolate the cause of problems such as image-formation defects and jams within

the engine. During this test you can stop the paper anywhere along the product paper path. The test can be

programmed to stop printing internal pages or an external print job when the paper reaches a certain

position. The test can also be programmed to stop from 0 to 60,000 ms. If the timer is set to a value that is

greater than the job-print time, you can recover the product in one of two ways.

● After the print job is completed press the Stop button to return to the Diagnostic Tests menu before

the timer times out.

● After the timer times out, press the Stop button . Activate the door switch to restart the engine and

return it to a normal state.

When the timer trips, the control panel display shows the message Printing stopped To continue, touch

“OK”. Pressing the Home button will print the previously selected job. If you do not want the previous job

to print, press the Stop button first, and then press the Home button .

NOTE: Do not try to perform a print/stop test while the product is calibrating, because you will be required

to power-