OM SYSTEM TG-7 Instruction Manual page 42

If the subject is too dark or too bright
If the camera is unable to achieve optimal exposure, the shutter-speed display will flash as shown.
Display
Slow shutter speed
1" F5.6
Fast shutter speed
2000 F5.6
If ISO sensitivity is not set to [AUTO], optimal exposure may be achieved by changing the setting.
B
Changing ISO sensitivity (ISO Sensitivity) (P.74)
g
The problem is caused by underexposure.
Choose a lower aperture value.
The problem is caused by overexposure.
Choose a higher aperture value.
42
Problem/solution
Choosing aperture (
A
: Aperture-Priority AE)