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a. The column (KBC_0 to KBC4) pins are input, and rows (KBR_0 to KBR3) pins are output.
Software will read the status of input pins and detect which key is pressing through scanning of
output pins.
b. For example; if numeral key #1 is pressing, KBR_0 shall be low (shorted to KBC_1). Opposite,
you can check the related connection, if numeral key #1 does not work.
c. OK, Camera (capture) and Navi. keys are also connected to KBC_x and KBR_x.
d. When lock key is in the disable position, R93 shall be low (0V).
e. When lock key is in the enable position, R93 shall be high (2.8V).
GTC
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Service Manual
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