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‎04-24-2017 03:22 PM

HP Recommended
Product: HP 4780
Operating System: Microsoft Windows 7 (64-bit)

No recent changes or software. Printer suddenly started saying carriage jam. there is no paper jam or any other obstruction in the carriage.It is new genuine Hp cartridges inntalled. i have followed a couple of postings on line but to no avail. Please can someone tell me how to overcome this problem.when my printer is turned off and then on again the cartridges move to the right and stay there, It makes a noise like a machine gun for a bit and then goes quiet.

1 REPLY 1

‎04-24-2017 07:11 PM

HP Recommended

The troubleshooting steps in the document here may help resolve the carriage jam on your Photosmart c4780 printer.

 

If it is difficult to move the carriage back and forth manually with the power disconnected it may help to clean ink residue off the carriage rod, then put one drop of a light oil such as sewing machine oil or 3-in-one oil on the rod.  Then move the rod back and forth a few times to distribute the oil.

 

If (and only if) the above steps do not resolve the issue you might try cleaning the encoder strip as shown in the post here.  The encoder strip is fragile, please read and heed the warnings.  Only use water to clean the strip, not alcohol or any other solvents as the fine lines printed on the strip are needed for proper operation of the printer.  Be gentle!


Bob Headrick,  HP Expert

I am not an employee of HP, I am a volunteer posting here on my own time.

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