Xerox Phaser 3435 Service Manual page 204

General Procedures and Information
Safety Relevant Facts
• Protecting device when overheating
-1st protecting device: H/W cuts off when detecting an overheating
-2st protecting device: S/W cuts off when detecting overheating
-3st protecting device: Thermostat cuts off the power
• Safety device
-The power of Fuser is cut-off after front cover is open
-The overheating safety device for customer
-The surface temperature of the Fuser Cover is under 80 degrees C
LSU (Laser Scanner Unit)
The LSU unit is controlled by video controller. It scans the video data received from video control-
ler with laser beam by
using the rotation principle of the polygon mirror to create the latent image on the OPC drum. It is
the core part of LBP. The OPC drum rotates as the same speed as the paper feeding speed. It
creates the /HSYNC signal and sends it to the engine when the laser beam of the LSU reaches
the end of the polygon mirror, and the engine detects the /HSYNC signal to arrange the vertical
line of the image on the paper. After detecting the /HSYNC signal, the image data is sent to the
LSU to arrange the its margin on the paper.
The one side of the polygon mirror is one line for scanning.
Print Cartridge
In the print cartridge, the OPC unit and the developer unit are in a body.
The OPC unit has OPC drum and charging roller, and the developer unit has toner, print cartridge,
supply roller, developing roller, and the blade.
Summary
• Developing Method: Non magnetic 1 element contacting method
• Toner: Non magnetic 1 element shatter type toner
• Charging capacity: -39.1+/-3 C/g (KAO meas. method)
• Average OD: 8.5 +/-0.5
• Toner Qty: 125 gf/250gf (4k / 10k)
• The life span of print cartridge: 4k/10k sheets (ISO 19752 Pattern / A4 standard)
• Toner Residual Sensor: Dot count with CRUM (CRU Monitor)
• OPC Cleaning: Collect the toner by using cleaning blade+ FILM OPC
• Handling of wasted toner: Collect the wasted toner in the cleaning frame by using cleaning
blade
• OPC Drum Protecting Shutter: None
• Classifying device for print cartridge: ID is classified by interruption of the frame channel.
6-18
(Toner)
5/08 Phaser 3435