Image forming apparatus

An image forming apparatus, comprising:

• a light scanning apparatus including:
• a first circuit board, on which a connector is mounted and on which at least a light emitting unit configured to emit a light beam, a light receiving unit configured to receive the light beam emitted from the light emitting unit, and a light source controller configured to control the light emitting unit are mounted;
• and a rotary polygon mirror configured to scan the light beam emitted from the light emitting unit on a photosensitive member;
• a second circuit board, on which a connector is mounted and on which an image signal generation portion configured to generate an image signal corresponding to image data is mounted;
• and
• a flat cable configured to connect the first circuit board and the second circuit board in order to transmit the image signal generated by the image signal generation portion to the light source controller,
• wherein the flat cable includes a plurality of wirings, at least one of the plurality of wirings being a line for transmitting, to the light emitting unit, the image signal for causing the light emitting unit to emit light,
• wherein the image signal generation portion is configured to generate a light emission data signal for detection for forming light emission data for detection, and transmit the light emission data signal for detection to the light source controller through the line of the flat cable for transmitting the image signal for causing the light emitting unit to emit light, and
• wherein the light source controller is configured to cause the light emitting unit to emit light in accordance with the light emission data signal for detection, and determine, based on an output signal output from the light receiving unit that has received the light beam from the light emitting unit, whether improper connection of the line of the flat cable for transmitting the image signal for causing the light emitting unit to emit light has occurred.