An image reading apparatus includes a transfer device for transferring a sheet, and a reading device for reading an image of the sheet at a prescribed read position. Placing the mounting bracket within the housing in a second orientation permits the mounting bracket to accommodate a second type of motor. A lamp unit integrates a lens portion with the back face of a base body having an inner base and an outer base which covers the front face of the inner base. Upon detection of the leakage current, the ballast safety circuit impeded an operation of the lamp to thereby dissipate the leakage current whereby the person can safely complete the mounting of the lamp on the ballast. The calculator calculates equalization coefficients based on the CIRs estimated by the estimator, and the compensator compensates channel distortion of the overlapped data using the equalization coefficients. According to this exemplary embodiment, the bipolar transistor further comprises a sacrificial planarizing layer situated over the conformal layer.