I am repairing an Aiwa HS P505 - and originally it wasn't listening to the play button. (I don't have a service manual for this unit) The play button was indeed dead and has been replaced. However... it still doesn't listen to the play button. I suspect that the hold switch is faulty, but I have no idea how to test this. Here is the switch... it has three positions (for this purpose) - left (remote on) - middle (hold) - right (remote off) I have a feeling that this switch is deceased. I was getting spurious readings from it (in the hold position, the centre and right pins were reading... but in the other two positions, nothing was happening.) Can anyone advise please?