Lexmark MS621dn

Theory of operation
POR sequence
As the printer turns on, the engine code goes through a series of tests to verify hardware integrity. If a hardware
failure is detected, then it is reported to the printer. If the POR sequence cannot be completed successfully,
then the printer may post an error message. The message states that service may be needed.
Print cycle operation
Print engine layout
1 Printhead
2 Toner cartridge
3 Imaging unit
4 Transfer roller
5 Fuser
4600-830, -835, -895
Theory of operation
289