Although "Guitar Hero 3" for the Wii, PlayStation 3, and Xbox 360 shipped with a wireless guitar that worked with the consoles' pre-existing wireless capabilities, if you picked up the PlayStation 2 version of the game you needed to use a receiver with the wireless guitar controller. If you are having trouble with this receiver, there are some simple fixes you can employ for common problems.
Disconnect the receiver, turn the PlayStation 2 off, and then reconnect. Since the PlayStation 2 is an ageing console, ports can malfunction seemingly at random. However, a simple reset and reconnect will solve most incidents.
Perform the syncing process again. If it has been a long time since you have played "Guitar Hero" or you have changed the batteries, your controller may have fallen out of sync with the receiver. Hold the sync button on the receiver and then press any of the fret buttons on the guitar. A red light will flash indicating a successful sync.
Check your batteries. "Guitar Hero" peripherals have a moderate battery life of about 10 hours. If you cannot turn on your "Guitar Hero" controller, or it frequently disconnects from the receiver and powers off, a change of batteries may remedy the situation.
Move closer to the receiver and move objects in the wireless line of sight. If you are getting spotty response time or frequent disconnection messages, move within 5 to 10 feet of the receiver and move any objects (like a table) that are between your controller and the console.