This model maintains high placements thanks to its reputation for reliability and because it is easy to refurbish. It is known for light printing early in the cartridge cycle and gradually getting darker throughout the cartridge life.

There is a flaw in the original cartridge design that leads to a high occurrence of wiper blade flipping. This flaw was corrected with the release of the HP 4100. Cartridges for the 4100 are backwards compatible in the 4000, and do not require a chip when used in this application.

We recommend a full Static Control build for this cartridge, which consists of toner, OPC drum, wiper blade, mag roller, doctor blade and PCR. A virgin build that reuses OEM mag roller, doctor blade and PCR has also been proven to deliver consistent, high quality prints with slightly lower image density.
  

Troy Systems 4050 MICR