Liquid crystal display, Back-up battery – Canon T 90 User Manual
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other Notes
1. Liquid Crystal Display
The T90's display panel uses liquid crystal to
display exposure information. After about 5
years of normal use, the display may become
hard to read
The liquid crystal may respond relatively
slowly in low temperatures and the display
may become dark at high temperatures
(about 60°C/140°F). Normal functioning will
return when the temperature returns to
normal.
2. Back-up Battery
The T90 has a built-in back-up battery which
memorizes the display panel data, such as
the frame counter number and the ISO film
speed, when the AA-size batteries are being
changed. Battery life is about 5 years. When
voltage becomes insufficient, "ISO 100” will
blink (at 2 Hz) on the display panel after load
ing batteries for normal camera operations. If
the back-up battery is removed, the memory
will be erased. In this case, reset the film
speed
Take your camera to the nearest Canon Service
facility for the repiacement of the liquid crystal or
the back-up battery. (Replacement will be at
owner's expense.)