FUJICA AX-3 Owner's Manual page 29

The Fujica Auto Strobe AZ has a guide number of 17 and it lets you take
automatic flash pictures with the entire range of apertures on your camera
lens. This is a highly effective flash for taking pictures of groups of
people because it interlocks with the camera's film speed selector and
extends the shooting distance when the camera is loaded with high speed
film. This flash will also automatically switch the camera's shutter speed
to 1/60 -sec. as soon as it is fully charged.
When the camera's Shutter Speed Selector is set to AE or AEL both auto
flash units will let you take automatic flash pictures as soon as they are
fully charged. The camera is capable of non-flash automatic exposure until
they are fully charged, so even if the shutter is released by mistake, you
will get a correctly exposed picture. You can also take continuous flash
pictures in combination with the Auto Winder X.
1. Taking Automatic Flash Pictures with the Fujica Auto Strobe 300X
1. Clip the strobe foot into the camera's accessory shoe.
2. Use any shutter speed except "B".