A CNN news anchor, Jack Cafferty, will pay a $250 fine and perform 70 hours of community service after pleading guilty to leaving the scene of an accident, prosecutors said yesterday. Mr. Cafferty was charged with the traffic infraction, along with misdemeanor charges of reckless driving, assault and harassment, after the police said he knocked a man off a bike with his Cadillac on Ninth Avenue on May 14. The bicyclist, Billy Maldonado, told the police he was slightly injured. A traffic officer and several pedestrians ran after Mr. Cafferty's car, but Mr. Cafferty drove through at least two red lights without stopping, according to a police complaint.