Connection Diagrams Troubleshooting - NEC NP-NC900C-A Service Manual

1-3. Connection Diagrams Troubleshooting

1-3-1. Slave uC Board
SLAVE uC Board side
CN202 to SMPS BD
VFB12+
VFB12-
J6 To Router BD Power
12V
GND
J3 To LED Status with Buzzer BD (CN1)
Note: Pin to Pin
5V
STL2
STL3
5V
BZ
J100 To MOTOR BD (J100)
Note: Pin to Pin
GND
GND
12V
12V
GND
MOTO TX2
MOTO RX2
3.3V
J91 for Fan14
FG1
Vout
GND
J92 for Fan3
FG1
Vout
GND
–
–
–
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TROUBLESHOOTING
1
g 12.V +/- 5%
2
3
– GND
4
1 g 12.V +/- 5%
2 – GND
g
1 LED power source.
2 f When low status, R LED will light (Open Drain) (Hi = 5V)
3 f When low status, G LED will light (Open Drain) (Hi = 5V)
4 g Buzzer power source.
Buzzer Control Signal When low status, Buzzer will alert. (Open
5 f
Drain) (Hi = 5V)
1 – GND
2 – GND
3
g
12V +/- 5% Power output to Motor BD
4
5 – GND
6 g
UART Interface between SLAVE uC BD and Motor BD (Hi = 3.3V)
7 f
8 g 3.3V +/- 5% Power output to Motor BD
1 f FAN Speed indication. (Pluse) (5V)
g
2 Fan voltage out
3 – GND
1 f FAN Speed indication. (Pluse) (5V)
2 g Fan voltage out
3 – GND
4 –
5 –
6 –
4-15