Printing Mechanism - Brother MFC-9420CN Service Manual

3.2 PRINTING MECHANISM

<Mechanical & Electrical Structures>
This laser beam color printer (hereinafter called "Machine") consists of five mechanical systems;
Print, Scanning, Transfer, Paper transport and control system. The machine produces color
printing through the interactive operations of these five systems as shown in Fig.3-2.
(1) Print System
The print system consists of the following 6 (six) functional parts located around the OPC
belt which form a toner image on the OPC belt.
• Charger Part
• Exposure Part
• Development Part
• First Transfer Part
• Discharger Part
• Cleaner Part
(2) Laser Scanning System
The scanning system consists of the following 2 (two) functional parts which form an
electrostatic latent image on the OPC belt by scanning it with a laser beam.
• Scanner Unit
• Scanner Motor (SCM)
(3) Transfer System
The transfer system consists of the following 3 (three) functional parts and transfers the toner
image formed on the transfer drum onto the page.
• First Transfer (Transfer Belt)
• Second Transfer Part (Paper Transfer)
• Drum Cleaner Unit
(4) Paper Transport System
The paper transport system consists of the following 5 (five) functional parts and picks up
paper from the paper tray, separates the paper from the transfer drum and exits it from the
machine body after fusing the toner image on the paper.
• Paper Tray
• Transport Rollers
• Paper Discharger
• Fusing Unit
• Paper Exit
3 - 2
manuals4you.com manuals4you.com
Confidential