| 摘要 |
<P>PROBLEM TO BE SOLVED: To supply a recording sheet of paper even when a size detection means equipped on a sheet tray has failed. Ž<P>SOLUTION: External equipment 3 inputs size information about the recording sheet along with image information and the like, or an operator enters the size of the recording sheet to be used, from an operation panel 1. In contrast, the size of the recording sheet inside the sheet tray 31 is detected by the sheet size detection means. When sheet size detection has been performed normally, the externally input size of the recording sheet is compared to the detected size are compared, and image formation is performed when they match. If the size detection means does not detect the sheet size normally, a failure determination means 62 determines the size detection means as "failed". When the size detection means has been determined as "failed", the result of detection by the size detection means is ignored and paper feeding from the selected sheet tray is enabled. This prevents an image forming apparatus from aborting operation even when a size detection sensor has failed. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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