The document provides instructions for disassembling and reassembling toner cartridges for the Samsung ML-6060 and ML-1650 printer engines. It describes the printers that originally used these engines, including models from NEC, Xerox, IBM, and Samsung. It notes that while the cartridges use similar internal components, molding differences prevent interchangeability between printer models. Standard and high-yield cartridge yields are listed for some models. The disassembly and reassembly process is largely the same for both cartridge types, with one small difference relating to a drive belt on the ML-1650 cartridge gear assembly.