hifi engine

PIONEER SX-1280 RECEIVER

HI- I AM HAVING TROUBLE WITH THE 2 PUSH IN SELECTOR BUTTONS FOR THE PHONO 1 AND PHONO 2. I CAN ONLY GET SOUND FROM THE TURNTABLE WHEN YOU PUSH THE BUTTON IN REALLY HARD AND HOLD IT. DOES ANYONE OUT THERE KNOW IF THE BUTTONS ARE BAD OR IF THEY MAY BE DIRTY--ANY HELP WOULD BE APPRECIATED---AT THIS POINT I CANT USE MY TURNTABLE.I JUST GOT THIS RECEIVER AND EVERYTHIG ELSE SEEMS TO WORK FINE. I THEN TRIED TO HOOK THE TURNTABLE TO THE AUX INPUTS BUT THAT DIDNT WORK EITHER---------HELP!!!!!!!!!!!!