CITIZEN SRP-280 - Manual (Page 4)

E - 2
1 General Guide
1 - 1 Power supply
Turning on or off
To turn the calculator on, press [ ON ] ; To turn the calculator off, press
[ 2nd ] [ OFF ].
Battery replacement
SRP-280 is powered by two alkaline batteries (GP76A). SRP-285 is dual
power system which is powered by one alkaline battery (GP76A) and a solar
cell. If the display becomes dim and difficult to read (especially when lighting
is dim for SRP-285), the batteries should be replaced as soon as possible.
To replace batteries :
1) Remove the screws and the back cover.
2) Replace the old batteries and install new ones with polarity in
correct directions, then secure the screws in place and press
[ ON ] to turn the power on.
Auto power-off function
This calculator automatically turns it off when not operated for approximately
9~15 minutes. It can be reactivated by pressing [ ON ] key and the display,
memory, settings are retained.
Reset operation
If the calculator is on but you get unexpected results, press [ 2nd ]
[ RESET ] in sequence. A message appears on the display to confirm whether
you want to reset the calculator and clear memory contents.
RESET : N Y
Move the cursor to “ Y ” by [], then press [ ENTER ] to clear all variables,
programs, pending operations, statistical data, answers, all previous entries,
and memory; To abort the reset operation without clearing the calculator,
please choose “ N ” .
If the calculator is lock and further key operations becomes impossible, please
press [ 0 ] [ DMS ] at the same time to release the condition. It will return all
settings to default settings.
1 - 2 Contrast adjustment
Pressing the [     ] or [] following [ MODE ] key can make the contrast of
the screen lighter or darker. Holding either key down will make the display
become respectively lighter or darker.