Hello
You don't say whether you have only just acquired this deck or if you have been using it for some time and it has only now started to give problems.
There are 2 or 3 possible explanations.

1. If you have only just got this deck and are using it on a stereo that has a dedicated phono (record player) input it may be that you need to get inside your turntable to turn off the built in pre-amplifier switch. To do so make sure the tone arm is securely fixed into it's holder (a rubber band will hold it in tightly) before turning the deck upside down and unscrewing the bottom.
2. If you have just got this deck and are trying to play it through a stereo system that does NOT have a dedicated phono (record player) input you may need to get inside the deck to turn the phono pre-amplifier switch on.
3. And if the deck has been used for some time this is the most likely - the record stylus (needle) probably needs replacing. Personally, although it is a bit more expensive, I prefer to replace the whole cartridge rather than just the stylus as they do need changing from time to time anyway. Always replace the stylus at least at the frequency recommended by the manufacturer. Regularly clean the stylus with very gentle strokes from the back towards the front using a small soft brush.