Phaser 6500/WorkCentre 6505 Service Manual Xerox Internal Use Only 2-43
Theory of Operation
Operation Modes
The printer includes the following modes:
• Ready Mode — The SFP is ready for printing; the MFP is ready for printing,
copying, scanning, or faxing.
• Printing Mode (SFP) — Printing is in progress.
• Running Mode (MFP) — Print, Scan, or Fax mode is in operation
• Print Mode — Printing is in progress for job printing, copying, or received
faxes
• Scan Mode — The Scanner is in operation for copying, local or network
scanning, and Fax receiving
• Fax Mode — Fax sending or receiving is in progress
• Sleep Mode — The machine enters a power saving state after a specified
period of inactivity. The period is set at the Control Panel, and can range from
3 to 60 minutes; factory default is 30 minutes.
• Deep Sleep Mode — The machine enters a deeper power saving state after a
specified period in Sleep Mode. The period is set at the Control Panel and can
range from 5 to 120 minutes.
Printer Control
Media Size Detection
The printer has no switches for detecting paper size; the length of the paper is
detected by the Registration Sensor as the media is fed. If the detected size does
not match the size sent in the print data, an error is reported.
Laser Control
The Laser Unit has four laser diodes for Yellow, Magenta, Cyan, and Black
respectively and the beam intensity is automatically adjusted for each color.
Image data is sent to the Laser Unit as an electric signal where the laser diodes
convert the image data to optical signals (data is expressed with blinking laser
beams). Variations in light quantity of laser beams or variations in the optical
system (such as lenses) or drum sensitivity may affect the electrostatic image.
Therefore, the laser beams are monitored and controlled by the laser diodes.
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