Image forming apparatus

An image forming apparatus comprising:

• a sheet tray configured to accommodate a sheet;
• an image forming unit configured to form an image on the sheet;
• a conveying unit configured to convey a sheet from the sheet tray toward the image forming unit;
• a fixing unit including a heater and a temperature detector that detects a temperature of the heater, the fixing unit being configured to fix an image formed on a sheet by the image forming unit;
• and
• a controller,
• wherein the controller is configured to execute:
• receiving a print job from external device;
• starting to provide power to the heater in reception of the print job;
• and
• determining which one of a first conveying processing, a second conveying processing, and a third conveying processing is to be executed in accordance with a setting content for a plurality of printing conditions,
• wherein the first conveying processing is to start conveying the sheet by the conveying unit after a first time period is elapsed since the temperature detected by the temperature detector reached to a first temperature,
• wherein the second conveying processing is to start conveying the sheet by the conveying unit before the first time period is elapsed since the temperature detected by the temperature detector reached to the first temperature, and
• wherein the third conveying processing is to start conveying the sheet by the conveying unit before the first time period is elapsed since the temperature detected by the temperature detector reached to a second temperature that is lower than the first temperature.