Printing apparatus and method of controlling printing apparatus

A control method of a printing apparatus which comprises:

• a first conveyance path on which a printing medium from a manual-feed stacking unit is conveyed in a conveyance direction;
• a second conveyance path converging with the first conveyance path at a converging section and on which a printing medium from a cassette is conveyed;
• a first conveyance roller pair provided downstream of the converging section in the conveyance direction of the first conveyance path and configured to nip and convey a printing medium;
• a first detection unit configured to detect a printing medium stacked on the manual-feed stacking unit;
• a second conveyance roller pair provided on a side downstream in the conveyance direction of the first conveyance roller pair on the first conveyance path and configured to nip and convey a printing medium;
• a printing unit provided on a side downstream in the conveyance direction of the second conveyance roller pair and configured to print an image on a printing medium;
• a second detection unit arranged between the first conveyance roller pair and the second conveyance roller pair and configured to detect a printing medium;
• a third conveyance path on which a printing medium is conveyed in an opposite direction opposite to the conveyance direction and in which a printing medium is flipped between front and back surfaces in the conveyance in the third conveyance path, which converges with the first conveyance path;
• and
• a flapper configured to selectively allow a printing medium which is conveyed in the conveyance direction by the first conveyance roller pair to pass to the second conveyance roller pair and allow a printing medium which is conveyed in the opposite direction by the second conveyance roller to pass to the third conveyance path, wherein
• control is performed to start feeding of a printing medium to the printing unit by the first conveyance roller pair in a case in which the first detection unit detects the printing medium but the second detection unit does not detect the printing medium.