Casio IT-2000D - Manual (Page 59)

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3.6 Contrast Adjustment
Function
Adjusts the contrast of the liquid crystal display.
Fig. 3.5
Operation
Press the “8 “ key to increase the contrast or press the “ 2” key to decrease the contrast.
Press the “ RET” key to confirm the setting.
Key Operation Function
8 key Increase the contrast.
2 key Decrease the contrast.
RET key Confirms the currently selected contrast setup and exits this
operation.
CLR key Cancels the currently selected contrast setup.
Others Invalid.
Note:
Depending on whether the parameters are being modified, the CLR key activates differently.
For example, if the CLR key is pressed while a parameter is being changed, that parameter
will be reset to the previous value.
However, if the CLR key is pressed while no parameter is being changed, the setup process will
be aborted and exited at that point.