NEC NP-NC900C-A, Руководство по обслуживанию

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4-19
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 BID & LCD Module 5V Power Supply
5V 6 g Keypad BID & 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: on
KEYOUT_3 20
g
Key detection, Matrix out _3
LED_ST0 21 g Key Lock Indicator LED Control_White; Hi: LED off. Lo: on
KEYOUT_4 22
g
Key detection, Matrix out _4
LED_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 Module 5V Power Supply
5V 28
g
Keypad BD & LCD Module 5V Power Supply
LCD_PW0 29 g
LCD Module Back Light & LED illumination BD Power Control
signal: Hi: Light off, Lo: Light On.
LCD_RS 30
g
LCD Module; H Data signal, L: Instruction signal
LCD_B7 31 g LCD Module Data stream 7
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
– 40 – –