A judge violated a defendant’s Sixth Amendment rights when he summarily rejected the man’s request to represent himself in the sentencing portion of his trial, a federal appeals court held.The 7th U.S. Circuit Court of Appeals last week sent Ruben Mancillas’ case back to U.S. District Judge William T. Lawrence of the Southern District of Indiana for a new sentencing hearing on two counts of illegally possessing ammunition as a felon.The court instructed Lawrence to allow Mancillas to proceed pro se if he …