Image forming apparatus capable of feeding recording paper sheet from alternative sheet feed device when unable to feed recording paper sheet from sheet feed device for adjustment processing

An image forming apparatus comprising:

• a plurality of sheet feed devices that feed a recording paper sheet;
• an image forming device that performs, on the recording paper sheet fed from one of the sheet feed devices, image formation based on a print job or adjustment processing that is image formation for a predetermined adjustment;
• and
• a control device that includes a processor and functions, through the processor executing a control program, as a controller that, in executing the adjustment processing, selects, from among the plurality of sheet feed devices, the sheet feed device for adjustment processing about which attribute information meeting a necessary condition for executing the adjustment processing is previously set, allows the selected sheet feed device for adjustment processing to feed the recording paper sheet, and allows the image forming device to perform the adjustment processing,
• wherein when, in executing the adjustment processing, the sheet feed device for adjustment processing is unable to feed the recording paper sheet, the controller allows a sheet feed device predetermined as an alternative sheet feed device for adjustment processing to feed the recording paper sheet.