Nine Chuck E. Cheese's pizza parlors in the Bay Area have been fined a total of more than $28,000 for violating federal child-labor laws by having teenagers operate dangerous equipment, authorities said Tuesday.

Restaurants in Cupertino, Redwood City, Brentwood, Newark, San Bruno, Fairfield and two in San Jose allowed teenagers to load and operate trash compactors, while the Chuck E. Cheese's in Rohnert Park allowed minors to operate a dough mixer, according to the U.S. Department of Labor's wage and hour division. Minors are not allowed to operate the equipment.