ELECTROPHOTOGRAPHIC RECORDING APPARATUS AND DEVICE FOR DETECTING TROUBLE OF LED ARRAY

PURPOSE:To easily arrange a trouble detection circuit by eliminating the necessity for setting a trouble detection circuit system by finely adjusting the same with respect to an LED array driving system by making it possible to detect the presence of the drive current flowing to an LED element at the time of the diagnosis of trouble in a state not being in contact with the LED driving circuit system. CONSTITUTION:An electrophotographic recording apparatus is equipped with a host CPU 1, a timing generating circuit 2, a diagnostic data generating circuit 3, a change- over circuit 4, LEDs L1-Ln constituting an LED array and an LED array driving circuit 20. In this case, a detection means consisting of a magnetic core 8 detecting the change of the current flowing to the common wire connected to a power supply 10 and a search coil S is provided and a trouble discriminating circuit 9 diagnosing the detection signal corresponding to the change of the current detected by the search coil S is mounted. When the signal obtained by amplifying the detection signal by a differential amplifier AMP reaches a reference value in the trouble discriminating circuit 9, trouble generation is outputted through a comparator CP and a retriggerable one-shot multivibrator RT.