NEC NP-NC900C-A, Руководство по обслуживанию

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4-32
TROUBLESHOOTING
“Confidential, Do Not Duplicate without written authorization from NEC.”
J604 to Key BD & LCD Module
SCL 1 g
I2C communication between EEBOX and Keypad
SDA 2 n
GND 3 – GND
GND 4 – GND
5V 5 g Keypad BD & LCD Module 5V Power Supply
5V 6 g Keypad BD & LCD Module 5V Power Supply
– 7 – –
– 8 – –
GND 9 – GND
GND 10 – GND
KEYIN_3 11 f Key detection, Matrix in_3
KEYIN_4 12 f Key detection, Matrix in_4
KEYIN_2 13 f Key detection, Matrix in_2
KEYOUT_0 14 g Key detection, Matrix out_0
KEYIN_1 15 f Key detection, Matrix in_1
KEYOUT_1 16 g Key detection, Matrix out_1
KEYIN_0 17 f Key detection, Matrix in_0
KEYOUT_2 18 g Key detection, Matrix out_2
LED_ST1 19 g Key Lock Indicator LED Control _ Green; Hi : LED off, Lo : LED on
KEYOUT_3 20 g Key detection, Matrix out_3
LED_ST0 21 g Key Lock Indicator LED Control _ White; Hi : LED off, Lo : LED on
KEYOUT_4 22 g Key detection, Matrix out_4
LCD_PW1 23 g No connection at Keypad BD
LCD_R_Wn 24 g LCD Module; H : Read Mode, L : Write Mode
GND 25 – GND
GND 26 – GND
5V 27
g
Keypad BD & LCD Model 5V Power Supply
5V 28 g Keypad BD & LCD Model 5V Power Supply
LED_PW0 29
g
LCD Module Back Light & LED illumination BD Power Control
signal; Hi : off, Lo :off
LCD_RS 30 g LCD Module; H : Data signal, L : Instruction signal
LCD_B7 31
g
LCD Module Data stream7
LCD_E 32 g LCD Module; Read/Write enable signal
GND 33 – GND
LCD_B4 34 g LCD Module Data stream 4
LCD_B6 35
g
LCD Module Data stream 6
LCD_B5 36 g LCD Module Data stream 5
GND 37 – GND
GND 38 – GND
GND 39 – GND
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