These are some common tools used to work on this device. You might not need every tool for every procedure.
Try to fix smaller problems with the troubleshooting page: Sony BDP-S1 Troubleshooting
The Sony BDP-S1 is one of the early versions of a blu ray player. You can easily identify this model by looking at the picture here or to be exactly sure the model number is printed in the bottom right corner on the front of the device.
For some more information, check out Sony's web page on this device, which includes how to & troubleshooting guides, manuals, and other possibly helpful information.
Another always helpful website to check is Wikipedia.
The manufacturer's technical specification pdf: Spec Sheet