Patent ID: 6956803
Filing Date: 2005-10-18
Classification: G11B

Abstract:
1. An apparatus for detecting abnormal states of an optical disc recording/reproducing apparatus having a control circuit for controlling an output power of a laser diode in recording and reproducing modes, the apparatus for detecting the abnormal states comprising: an overflow/underflow detector which detects whether overflow or underflow of the laser diode output power occurs, by comparing a laser diode output power control value, which is output from the laser diode output power control circuit, with an overflow setting value and an underflow setting value and outputs a detection result; a mode switch which switches the operation mode of the laser diode output power control circuit from the recording mode to the reproducing mode, in response to the detection result of the overflow/underflow detector, a Digital/Analog Converter (DAC) which latches an output of the laser diode output power control circuit and provides the latched output to the laser diode; and a scale setting register which stores a scale setting value of the digital/analog converter, and changes the scale setting value according to the detection result of the overflow/underflow detector.