Printhead issue

[Simone451]

I have a photosmart 7520. Being some months that e print is not working anymore, yesterday I decided to investigate deeper. Lots of post suggested to enter engineering menu and perform a partial-full reset and I did it. Pls note that 1 minute before doing this I regularly printed 1 sheet. After this operations the printer worked for 15 mins during which I struggled to associate again Wi-Fi network (btw why this printer takes so long to associate a Wi-Fi network and often says is not possible even if the password is correct???). Anyway after these 15 mins the printer gave me the error “

printhead appears to be missing, not detected or incorrectly installed”

no way to remove it: I tried to clean cartdriges, remove and reseat printhead, do other resets … nothing. Now the printer is stuck. I use compatible cartridges and I don’t have anymore original SETUP one but I entered the engineering menu and enabled trade OOB to bypass this need (did I do everything is necessary?)

pls help me is not possible that in 10 mins the printer moved from working correctly to not working at all!!! I don’t want to change printer for this 

[Simone451]

How many answers!!!!! What is the utility of an experts community if no one answers to urgent queries????????

Next printer won’t be an HP anymore for sure

[Kumar0307]

@Simone451, Welcome to the HP Support Community! I’m here to help.

I understand you are not able to print due to this error. Kindly perform the steps mentioned in this document - Printhead errors

Insert one ink cartridge at a time and check for the error.

Reset the printer

1. With the printer turned on, disconnect the power cord from the rear of the printer.
2. Wait at least 60 seconds.
3. Reconnect the power cord to the rear of the printer.
4. Turn ON the printer, if it does not automatically turn on.
5. Wait until the printer is idle and silent before you proceed.

Note: HP recommends connecting the printer directly to a wall outlet rather than a surge protector or a power strip.

If this does not help, unplug the power cable and hold the power button down for 10-15 seconds and release it. Power on the printer and check.

If the printer is stuck on this error, we cannot perform any resets. I'm afraid it is a hardware failure. 

If the printer is out of warranty, I suggest you upgrade the printer. You may visit Hp Store to check the available printers.

Keep me posted for any other assistance.

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Have a great day!