HP Q6470A 501A Color LaserJet 3600 3800 CP3505 Toner Cartridge (Black) in Retail Packaging

to begin remove the spring on the side of the cartridge Unlock the spring on the other side of the cartridge the top half of the spring will stay under the blue handle extract the 2 pins using small pliers They are in this position Note the different pin sizes the short pin is on the left side the long pin is on the right side separate the two halves of the cartridge toner section and drum section remove the metal pin indicated by the red arrow using a small hammer and a screwdriver punch the drum pin out halfway, through its hub rotate the drum, so the pin is visible extract the pin, using pliers these pins are in tight and are hard to remove remove the drum axle remove the drum remove the 2 screws remove the support plate remove the developer cylinder with its bushings if you want to remove the doctor blade remove its 2 screws but this blade is glued, and easy to be warped or damaged