Scanner is adding a horizontal line to scans

[clarissa_in_SC]

My HP laser jet M725 has started adding a horizontal line to scans. I've cleaned the glass. This issue happens when using the ADF and when placing the sheet on the glass (a different orientation).Any ideas?

[Repairatrooper]

Can you post a sample clearly showing the orientation (feed direction) from both sources?

[Spy228]

I have the same problem as the original post. M725 with faded horizontal lines using both the ADF and flatbed scanner. I can cleaned the glass many times, but since it happens on both, It probably the scanner head itself or something else? 

Anyone have any more information on this?

[Spy228]

The printer consistently leave streaks in the same two spots, but they change with scanner calibration. I have attached 4 scans. I recalibrated before these and again between them. I did one scan through the adf and one on the glass each time.

Calibration 1:

Cuts out two lines completely

https://vtengca-my.sharepoint.com/:b:/g/personal/wojtek_vteng_ca/Ecssztz22H1MhDLjNXybOXgB56ojFpAMzxs...

Re-calibrated it..

Calibration 2:

Information is all there, but lines darker/lighter lines

https://vtengca-my.sharepoint.com/:b:/g/personal/wojtek_vteng_ca/ERzFAcw_ksBMmhkh3oudi7wBJwzpINPex1v...

Any idea what it causing this and how to fix it?

Thank you

The spots remains the same, but you can see the difference?

Calibration 1 cuts out small lines…. Calibration two has all the information, but leaves darker streaks or the lines make the text slightly lighter?