Image forming apparatus with variable toning bias offset service utility

  • US 6,724,998 B2
  • Filed: 03/16/2001
  • Issued: 04/20/2004
  • Est. Priority Date: 03/17/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. An image forming apparatus comprising:

  • a primary charger for providing a primary charging voltage on an image support;

    an image support for supporting an electrostatic latent image on the surface thereof;

    a developing unit having a developing agent support, the developing agent support retaining a developing agent, including toner and carriers, contained in the developing unit, and the developing unit converting the latent image on the image support into a toner image by causing the toner to adhere to the surface of the image support;

    a developing bias supplying unit for supplying a developing bias voltage to the developing agent support of the developing unit; and

    , a controller for setting the developing bias voltage and primary charging voltage at predetermined values undesirable for normal image forming operation in order to provide diagnostic information on the image forming apparatus.

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