Lexmark M3150, Service Manual

Page: 365 / 400

Theory of operation
POR sequence
As the printer is turned 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.
Printer control
The printer uses a single processor for both RIP and engine functions. The raster image processor (RIP) code
performs system responsibilities such as PC connection, LAN, ISP attachments, and bitmap generation. The
engine code performs tasks related to the operation of the electrical and mechanical device systems such as
motors, lasers, power supplies, and fusers. The NVRAMs are located on the controller board and control panel,
replacement of either the controller board or control panel will pull or mirror NVRAM data from each other.
Paper path information
Input tray
Component functions for feeding from the tray:
•
Tray present sensor—Detects if the tray is inserted
•
Media present sensor—Detects whether the media level is empty or low.
•
Pick/Lift motor—Supplies the mechanical power requirements of the lift plate and the pick rollers.
When feeding media, the front part of the lift plate is raised, pressing the media to the pick rollers. The pick
rollers rotate to feed the media to the separator rolls. The separator rolls rotate in a direction opposite to the
pick rollers. This ensures that sheets are fed one at a time. The media is then fed to the secondary input roller
and then to the first input roller.
4514-6xx
Theory of operation
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