Peugeot 406 cd player says; 'NO DISC'?

1998 406 6 disc changer has stopped working. Radio and tape player work fine.
Put in cleaning disc and workes for short time, then keeps coming up with error; 'No disc'.
No whirring of discs or any noise unless eject cartridge.
Player is not factory fitted, but steering controls and lead fitted and work properly.
Can anyone help please?