Nikon Camera N90 - Manual (Page 187)

In Auto Multi-Program mode
If H ! appears, background may be overexposed. To give
the background a correct exposure, reset to an exposure
mode that lets you choose a faster shutter speed and/or a
smaller aperture.
If shutter speed indicator shows BO, backgound may
underexposed.To extend the automatically controlled shutter
speed range, set the camera to the Slow Sync mode
(p.121), or switch to another exposure mode that lets you
choose a slower shutter speed and/or a wider aperture.
In the Slow Sync or Rear-Curtain Sync mode, L o may
appear in the LCD readout to signal that the background
may come out underexposed.
In Shutter-Priority Auto exposure mode
If H I appears, background may be overexposed. To give
the background a correct exposure, set a higher shutter
speed. If H I remains with a shutter speed of 1/250 sec.,
background will be overexposed without automatic flash
output level compensation.
If electronic analog dispaly indicages (minus)" value,
background may be underexposed. To give the background
a correct exposure, set a slower shutter speed. If electronic
analog display remains with a shutter speed of 30 sec., the
background will be underexposed unless flash output level is
compensated.