how do i change the fuse on a scantronic 9800 keypad?

how do i change the fuse on a scantronic 9800 keypad. for some reason the keypad has gone dead when i disconnected the internal sounder and the sounder attached to the keypad. i presume i have blown a fuse. i cannot locate the fuse in the control panel box. is it a glass fuse ? where is this fuse ?