Hewlett-Packard Color LaserJet 1500 Service Manual
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Brand: HP
Category: All in One Printer , PDA , Printer
Type: Service manual for HP 1500
Pages: 312 (14.61 Mb)
ENWW 4 Theory of operation 83
Latent-image-formation stage
Step 1: primary charging
A dc bias is applied to the primary charging roller, which transfers a uniform negative potential to
the photosensitive drum.
Figure 29. Step 1: primary charging
Step 2: laser-beam exposure
The laser beam scans the photosensitive drum to neutralize negative charges on parts of the
drum. An electrostatic latent image is formed on the drum where negative charges were
neutralized.
Figure 30. Step 2: laser-beam exposure