zandieasked Dec 4, 2017 at 4:39am
Remove cartridge lock error
Laserjet 600 M601 remove cartridge lock error
The cartridge lock is usually orange in color sitting on the top side of the cartridge, make sure it's removed. If you can't see anything it's probably something inside it so best to try another. Link below is shows a basing drawing of the cartridge with lock to give you an idea of what they usually look like.