This disassembly guide explains how to remove the top cover assembly on a Toshiba Satellite M115 laptop.

It is necessary to remove the top cover if you need to replace the laptop touch pad, witch is attached to the top cover, or replace the motherboard.
Steps 1-2 shows how you can access laptop memory, hard drive, wireless card and modem.
Steps 5 explains how to remove the DVD drive.
Steps 7-10 will be useful for removing and replacing the keyboard.

The motherboard removal instructions will be very similar to instructions for a Toshiba Satellite M105.