Citizen Printer

How does HP inkjet printer detect whether the cartridge is the correct type or not?

My HP 950C keeps complaining about the color cartridge (either saying it does not presence or wrong type). I have tried cleaning the contact as HP web site suggested but no luck. I am looking a way to bypass the cartridge checking. My HP 950C keeps complaining about the color cartridge. The cartridge is the correct type but the printer keeps saying the cartridge does not presence or it is the wrong type. I have tried cleaning the contact as HP web site suggested but no luck. I am looking a way to bypass the cartridge checking.

Public Comments

1. The cartridges have built-in circuitry on them (typically, you can see it when you peel off that little plastic bit after you've opened the package). This communicates with your printer. As far as workarounds, I don't know, but I wouldn't try to mess around with a different cartiridge that isn't appropriate for my printer - you're better off just getting the appropriate one than trying some sort of workaround that can mess up your printer.
2. You might be using the wrong type that the printer required. I have HP computer and using Epson printer, it works well. Keep on checking and try another cartridge, the one that compatible to your printer.
3. There is an electronic encoding on the cartridges itself. If the electronics on the rear are damaged, defective or just plain corroded it will result in improper connectivity leading the printer into thinking it has the wrong cartridges. You may want to try gently cleaning the electronics by gently rubbing them in one direction with a pink eraser. (The electronics are the little copper squares on the back) If this doesn't work then unfortunately it may be time to replace the cartridge. Just to clarify the correct cartridge for your printer is an HP 78 or HP C6578.