HP Color LaserJet CM2320 Service Manual - Page 108
Latent-image formation stage, Step 1: primary charging, Step 2: laser-beam exposure, Developing stage
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Latent-image formation stage During the steps that comprise this stage, a latent image is formed by applying a negative charge to the photosensitive drum. You cannot see this image on the drum. Step 1: primary charging A high-voltage DC bias is applied to the primary charging roller, which is made of conductive rubber and is in contact with the drum surface. As the roller moves across the drum, it applies the negative charge to that surface. Figure 5-12 Primary charging Step 2: laser-beam exposure The laser beam scans the photosensitive drum to neutralize the negative charge on portions of the drum surface. An electrostatic latent image is formed where the negative charge was neutralized. Figure 5-13 Laser-beam exposure Laser beam Unexposed area Exposed area Developing stage The developing cylinder comes in contact with the photosensitive drum and deposits toner on the electrostatic latent image. 96 Chapter 5 Theory of operation ENWW
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