Last night my CFS-45 was working fine. I left a tape in the deck (system was completely turned off) because I forgot to take it out. Now, when I put in any tape, it sounds quiet and raspy. Is this some odd coincidence or is it because I left the tape in too long and it did something?
If the tape you played and left in the boombox was really old, or dirty, it might only be a dirty play head. I would suggest cleaning and demagnetizing the play head and see where that gets you.