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Image forming apparatus having a test mode

  • US 5,839,013 A
  • Filed: 06/28/1994
  • Issued: 11/17/1998
  • Est. Priority Date: 06/28/1993
  • Status: Expired due to Term
First Claim
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1. An image forming apparatus, comprising:

  • image forming means for forming an image on a sheet;

    mode setting means for setting a test mode for a detection of a cause for a defect in the formed image;

    control means for causing said image forming means to form a plurality of sample images by changing operating conditions of said image forming means when the test mode is set by said mode setting means;

    input means for manually inputting a result of comparison of the plurality of sample images by an operator;

    and display means,wherein said control means discriminates whether or not the cause of the defect in the formed image can be specified on the basis of the input from said input means, and wherein when the cause cannot be specified, determines a content of a test mode to be subsequently carried out, and when the cause can be specified, displays the specified cause on said display means.

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