How to clear a deep jam in Achiever CCS 5000 shredder?

Have an Achiever CCS 5000 shredder (12 page, cross cut) that seems to be jammed - tried reversing & forward in manual mode which doesn't seem to be working & don't want to burn out the motor. It's NOT beeping and does run but paper feeds part way then stops; it does run but something is jammed too deep in it for me to get to it to clear it. It's not made for a layman to take apart to be able to get to the jam, either.