Adjustment method for image forming apparatus, and image forming apparatus

An adjustment method for an image forming apparatus including

• a conveying portion capable of executing first conveying processing for conveying a sheet such that a first surface of the sheet faces a target direction at a transfer position on a conveying path, and subsequently executing second conveying processing for conveying the sheet such that a second surface of the sheet faces the target direction at the transfer position,
• a printing portion which executes print processing for forming a toner image on a surface of a rotating image-carrying member, and transferring the toner image onto the first surface or the second surface of the sheet which is facing the target direction from the image-carrying member, at the transfer position, and
• a density sensing portion which senses a toner density of a portion on the surface of the image-carrying member, which has passed through the transfer position,
• the adjustment method comprising:
• causing, by a processor, the printing portion to execute, when the first conveying processing is executed, test print processing for executing processing of forming on the sheet a plurality of test toner images having intervals provided therebetween along a conveying direction of the sheet, under a print condition that differs for each of the plurality of test toner images;
• acquiring, by the processor, when the first conveying processing is executed, a plurality of first sensing densities that are sensing densities sensed by the density sensing portion for a plurality of test areas that are areas on the surface of the image-carrying member where the plurality of test toner images have been formed;
• causing, by the processor, the printing portion to execute the test print processing when the second conveying processing is executed;
• acquiring, by the processor, when the second conveying processing is executed, a plurality of second sensing densities that are sensing densities sensed by the density sensing portion for the plurality of test areas on the surface of the image-carrying member;
• and
• comparing, by the processor, the plurality of first sensing densities and the plurality of second sensing densities to adjust the print condition in the print processing when the second conveying processing is executed.