Image forming apparatus with condition setting for manual duplex mode

An image forming apparatus comprising:

• an image forming section forming an image on an image forming face of a recording medium;
• a recording medium feeding section set with the recording medium to be fed to the image forming section;
• a recording medium ejecting section receiving the recording medium formed with the image in the image forming section, and having a manual duplex mode for manually setting a recording medium formed with an image on a first image forming face and ejected to the recording medium ejecting section on the recording medium feeding section and forming another image on a second image forming face of the recording medium opposite to the first image forming face;
• a processor configured to provide:
• a condition setting section for individually setting an operating condition of the image forming section for forming the image on the first image forming face and another operating condition of the image forming section for forming the image on the second image forming face in the manual duplex mode;
• a control section for controlling the image forming section on the basis of each of the operating conditions set by the condition setting section;
• and
• a humidity detecting unit detecting humidity;
• wherein
• the image forming section comprises:
• an image carrier carrying a developing agent image corresponding to the image to be formed on the recording medium;
• and
• a developing agent feeder supplied with a developing bias for feeding a developing agent to the image carrier, and
• the condition setting section sets a developing bias for forming the image on the second image forming face lower than a developing bias for forming the image on the first image forming face when the humidity detected by the humidity detecting unit is not higher than a predetermined humidity.