In the middle of a simple printing I got the error message "The printhead installed is not intended for this printer or it is damaged." I have read forums, helps etc enough to know I need to clead the leads to to printhead. I opened the door, removed the cartriges but am unable to find the "lever" that is suppose to be raised.
Welcome to the HP Forums. I would be happy to help you with your HP Officejet 6600 printer. I understand that you are getting issues with printhead and you have already done some preliminary troubleshooting.
Don't worry though as I have a few steps to determine the issue and find a solution as well,
Printhead in this printer is not a replaceable part, and there is no latch in this printer.
Reset the printer to fix this issue.
Turn the printer on, if it is not already on.
Wait until the printer is idle and silent before you continue.
With the printer turned on, disconnect the power cord from the rear of the printer.
Unplug the power cord from the wall outlet.
Wait at least 60 seconds.
Plug the power cord back into the wall outlet.
Reconnect the power cord to the rear of the printer.
Turn on the printer, if it does not automatically turn on.
The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
Click here and follow the steps mentioned in the document to fix this issue.