Canon PC400 Service Manual - Page 29

CHAPTER 1 GENERAL DESCRIPTION V. IMAGE FORMATION A. Outline Copyboard glass Scanning lamp Primary charging roller Lens array Developing blade Fixing film Cleaning blade Photosensitive drum Developing cylinder Pressure roller Transfer charging roller Static eliminator Figure 1-501A The copier is an indirect photorepro graphic system constructed as shown in Figure 1-501A. The image formation process con sists of seven steps as discussed below. Latent static Image Formation 1. Primary charging 2. Image exposure Step 1 : Primary charging (negative) Step 2 : Image exposure Step 3 : Development (AC and DC bias) Step 4 : Transfer (negative) Step 5 : Separation Step 6 : Fixing Step 7 : Drum cleaning 7. Drum cleaning 3. Development Delivery 6. Fixing 4. Transfer 5. Separation Registration Multifeeder : Flow of copy paper : Rotation of drum Figure 1-502A The photosensitive drum has a layer construction: the photoconductive layer on the outside and the conductive alu minum base, inside. Photoconductive layer Aluminum base Figure 1-503A COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-17