The printer makes a noise that sounds like a machine gun as soon as it starts to print, but just at that time and each time it prints. The noise does not continue, but stops once the printer starts printing. It is a Officejet J5780 all-in-one.

Solved!

Found a misfed page jammed inside the printer on far
right side ( by the ink service station) - after removing the
"hidden" wad, the printer no longer makes "clicking" sounds
and prints right away!

Officejet Pro 8600

Try. HP print and scan doctor

Hi Paul,
I have exactly the same problem and I also use Permajet (like you, successfully for a while). In fact I took the printer into a shop that does maintenance but it printed fine for them. As soon as I got it home the problem started inmediately! At random points in the print you get a crunching noise and the print has vertical marks on it. The engineer at the shop had no idea what this could be and I just wondered if you had solved it.
I've swapped cables, installed it on different machines but nothing works.
Kind regards
John

i have the same printer and the same problem--did you ever find a solution?

Maybe go to a local store and try a display model of the same printer and see if it makes identical sound. If it doesn't make the same, contact whoever you bought from to see about warranty or refund. Can also contact HP customer service for advice.

The print head is stuck - something has jammed it and the noise you are hearing is the carriage for the print head. Open the top and try moving the head by head sideways to see what has jammed it.

I have an HP 6110 is always has a grinding noise.No functions work. HP just want me to buy a new machine. They are bad quality 3 in one's. That is for sure.

Hi,

This is quite normal with this series of printers. Happens on my 6310. It "machine guns" only occassionally (once a month), and then the gunning noise slows down slowly, then the print starts. Might be shaking the head to clear ink rigorously or something.

Head carriage jammed or possibly stripped gears-

I had a persistant grinding noise about 30 seconds after the printer finished printing. It's been going on about 2 months. I did one thing which seemed to work. So try opening the cover on the back of the machine by lifting upward on the gray lever in the middle of the back of the machine. Leave this cover open during and after printing. The grinding noise went away.