NEC NP-NC900C-A Service Manual page 33

1-3-4. Fan Driver Board – C side
Fan Driver BD – C side
J9810 From SLAVE uC BD (J8)
Note: Pin to Pin
12V
12V
GND
5V
GND
I2C_SCL
I2C_SDA
FAN_Driver BD_Flag
–
J9811 for Fan8
FG1
Vout
GND
J9812 for Fan6
FG1
Vout
GND
–
"Confidential, Do Not Duplicate without written authorization from NEC."
TROUBLESHOOTING
CN9812
CN9811
CN9810
1
f 12V Input
2
3 – GND
f
4 5V Input
5 – GND
6 f
I2C communication between uC BD and Fan Driver BD
7 n
If FAN actual RPM is out of the programmed value, ALERT pin
8 g
goes low.
9 – –
f
1 FAN Speed indication. (Pluse)(5V)
2 g Fan voltage out
3 – GND
f
1 FAN Speed indication. (Pluse)(5V)
g
2 Fan voltage out
3 – GND
4 – –
4-23
CN9813
CN9814