New cartridges no plastic covering the front of the L7680 HP printer

SOURCE: HP LaserJet 1022 Error Message

I had exactky the same issue. The problem is not with the front door or the cartridge. I solved this as there was a very small paperjam. If you take out all the paper and shine a torch into the printer you may find a small piece of paper stuck on the sensor that is causing the problem

SOURCE: HP L7680 printer will not recognize refilled ink

HP printer does not support refilled cartridges, so replace with hp genuine cartridges

SOURCE: hp LaserJet 1000 series printer error message on front door cover and toner cartridge missing

hi..
ijust solved this issue

WHOA ...

my printer is HP 1020,, and i was printing a huge number of sheets, which USED TO GET STUCK IN AGAGIN AN AGIAN... coz, i was using a low quality damned paper..

now,, it began to gave error ,tht either the front cover door not closed , or its toner cartridge missing.

Well,, simple solution for me was (which is basic i think)

>> Remove the metallic plate on the back of the printer
>>there you 'll find , on the right side, near the socket for poer cable, a "lever" like thing, thats the lever for the "barrier" between the SENSOR... move it and u'll get an idea..
>> if its jammed ,, then free it..
(mine was stuck into dont know wht, and i freed it, and all is fine)

>> if spring adjusment is wrong, correst it(you may get idea by moving it again n again, whether it comes bbacl to its orgignal position or not...

> remore the tonor cartidge and insert it back while looking on the lever movements.... and you ll get whats the matter with it..



PLEASE note it,,, that i think,, the sensors are NEVER damaged !!! mind it.....my knowlegde says , sensors are hardly damaged ..



-----Adios.... Tauseem Omer...Ravian Kemcolian.

SOURCE: HP L7680 won't print black, cartridge is new, says

Try printing a Diagnostic page or clean cartridge. Looks like the printheads might be clogged due to low usage or general wear and tear, they may not be working as desired.

SOURCE: hp 5550 deskjet not printing

This is typical cartridge problem.Which cartridge changed?This printer can print with the only one cartridge inside it, whatever which.Try this: Open cover put out color cartridge then close cover.If blinking stops replace color cartridge.If blinking continues put out black cartridge and put in color.If blinking stops replace black cartridge, if not stop replace both cartridges.
If this not help your printer has problem in carriage unit and need repair.