4059-XXX
Duplex Option
The duplex option interface is a six pin autoconnector that provides a +24 V dc, +24 V dc return, serial interface transmit signal, serial interface receive signal and two ground pins. The duplex option receives the +24 V dc from the base printer for the duplex motors and also converts the voltage to +5 V dc for duplex electronics.
Duplex chassis grounding is provided from the printer to the duplex option through a ground spring attached to the frame and base of the printer. The ground connection is automatically made when the option is installed below the printer.
The paper input sensor is located in the rear of the duplex unit under the input paper guide. The rear cover open switch is located on the rear cover assembly. The paper exit sensor is located on the left frame assembly. The jam removal tray open switch is located at the end of the left frame assembly. There are no switches in the level 2 duplex option.
Option Microcode
The options are “Smart Options” or options that have a system board. The option system board has a microprocessor that controls the option mechanism. A software architecture is provided that controls the option and communicates information such as paper path status, sensor or switch status, motor status and so on to the base printer.
Fuser Operation
The fuser in the Optra S printers is made up of two primary assemblies. The first assembly is the top fuser cover which contains the thermistor/cable, thermal fuse, cable assembly, left and right lamp brackets and cover. This is a complete assembly and the parts cannot be individually replaced as in previous Lexmark laser printers.
The thermal fuse protects the fuser assembly from overheating or problems with the fuser lamp by opening the ac circuit to the lamp. The thermistor assembly is designed to keep the temperature of the fuser hot roll within a predetermined temperature by being in contact with the fuser hot roll and changes resistance as the temperature of
