pensionerj

hello

i need to change the fuse in my optima g3 compact alarm panel, if i enter the engineers code and turn the power off to the box will the alarm still go off since it has had the cover removed and think it is tampered, also, once i take the front panel off, do i need to remove the circuit board to fit the fuse or will it be exposed for me to take the blown one out and replace with new, the fuse to be replaced is F3, finally, assuming i replace fuse, put cover on and turn power on to panel should the alarm go back to daytime once i input the engineers code

thanks