AIWA FD-N939YU for the table top unit;  my problem is that I can not set the tuner channels;  the ldc screen on the tuner is so faint that I can not see it other then when it is  in the dark.  There doesn't seem to be buttons for me to push to set the tuner on the deck nor on the remote.  How do I set the tuner - I know I had done it before _  does this deck have a battery that needs to be replaced? I also need a manual for this