Here is a nice manuals site that you can purchase boombox service manuals in pdf format. Most are only $4.99 and within an hour or so you will get your download link. They take Pay Pal and offer you a credit towards other manual purchases if you post a review of the manuals you've already purchased.
Here is the link: http://www.owner-manuals.com/index.php?main_page=index
Here is the link: http://www.owner-manuals.com/index.php?main_page=index