Abstract: An apparatus for preventing a picture fluctuation and correcting a reverse pulse in a servo system for a video cassette recorder having a still or slow motion playback function. The apparatus comprises speed and phase error detectors for detecting speed and phase errors, speed and phase controllers for controlling a speed and a phase in response to output signals from the speed and phase error detectors, mixers for mixing output signals from the speed and phase controllers, a system control circuit for controlling an operation of the servo system, the system control circuit including a correction circuit for varying widths or edges of correction signals in response to speed and phase information, and drivers for driving motors of the servo system in response to the correction signals.