I have a faulty HP Officejet Pro 7740 A3/A4 Scan,print,fax,copy printer, which at one time worked perfectly.
The fault is the printhead, I ordered a replacement and then found the replacement faulty with a different problem.
I've decided it is just not worth the time and money trying to get it to work, so if anyone is interested in getting it to work or could use it for spares, I am more than happy for you to come and collect it and hopefully make good use of it!
