Michael Fremer of Stereophile has a DVD on turntable set up. It might be a good investment in terms of understanding how all these issues interact. Setting up a table is an iterative process. For example, many are finding that very precise cartridge alignment allows for lower than typical VTF, which allows for v. low or no anti-skating.
Its very common for TTs to be set up incorrectly, so verify that its been done right and also purchase a 10x loupe so you can see the stylus and make sure its clean. Search the forum for "magic eraser" to find how to make a very good stylus cleaning tool for very low $. If its still not clean as a whistle, try using a v thin strip of fine grit sandpaper and gently swiping the stylus surfaces, followed by more magic eraser and then dry brushing.
Its very common for TTs to be set up incorrectly, so verify that its been done right and also purchase a 10x loupe so you can see the stylus and make sure its clean. Search the forum for "magic eraser" to find how to make a very good stylus cleaning tool for very low $. If its still not clean as a whistle, try using a v thin strip of fine grit sandpaper and gently swiping the stylus surfaces, followed by more magic eraser and then dry brushing.