Image forming apparatus

An image forming apparatus comprising:

• an image bearing member configured to bear a toner image;
• a transfer device configured to transfer the toner image from the image bearing member onto a recording material in a transfer portion;
• a voltage applying portion configured to apply a transfer voltage to the transfer device;
• a fixing device configured to fix the toner image, transferred on the recording material, on the recording material in a fixing portion:
• and
• a controller capable of executing an operation in a double-side mode in which toner images are formed on double sides of the recording material and capable of executing an operation in an output mode in which a chart formed by transferring, onto the recording material, a plurality of test images which are for adjusting the transfer voltage applied during the operation in the double-side mode and which are formed under application of different transfer voltages is outputted,
• wherein during execution of the operation in the output mode, the controller is capable of selectively executing:
• a first operation in which an image forming operation is controlled so that the test images formed on a first side of the recording material are fixed on the first side of the recording material by the fixing device and then the test images are transferred onto a second side of the recording material, and
• a second operation in which the test images formed on a first side of a first recording material are fixed by the fixing device and then the first recording material is outputted without forming the test images on a second side of the first recording material and then in which a second recording material is passed through the fixing device without forming the test images on a first side of the second recording material and then the test images are transferred onto a second side of the second recording material.