Sorry all, I know what the problem was and am feeling really stupid. When I first selected a record after putting the motor back together, I had to quickly reject as the tone arm was out. Anyone familiar with this model knows that the built in volume control is in a recess at the rear and that the reject button is behind this. So if you are in a hurry you can run the side of your hand along the top of the volume control knob when reaching for the reject button, which of course turns the volume down, doh!