4-17
TROUBLESHOOTING
“Confidential, Do Not Duplicate without written authorization from NEC.”
12V
1
g
12V Output
12V
2
GND
3
–
GND
5V
4
g
5V Output
GND
5
–
GND
I2C_SCL
6
g
I2C communication between uC BD and Fan Driver BD
I2C_SDA
7
n
FAN_Driver BD_Flag
8
f
If FAN actual RPM is out of the programmed value, ALERT pin
goes low.
–
9
–
–
–
10
–
–
–
11
–
–
TXD
1
f
Ballast UART Interface.
GND
2
–
GND
3.3V
3
g
Ballast Control Interface Power Source
SCI/Lampsync
4
g
Lamp Lit input/Lamp sync input
RXD
5
g
Ballast UART Interface.
TXD
1
f
Ballast UART Interface.
GND
2
–
GND
3.3V
3
g
Ballast Control Interface Power Source
SCI/Lampsync
4
g
Lamp Lit input/Lamp sync input
RXD
5
g
Ballast UART Interface.
–
6
–
–
DC Voltage
1
f
Per the temperature.
3V3
2
f
Normal: 3V3/Other voltage: SLAVE uC BD 3V3 suppling is
something wrong.
DC Voltage
1
g
Per the temperature.
–
2
–
–
3V3
3
f
Normal: 3V3/Other voltage: SLAVE uC BD 3V3 suppling is
something wrong.
TAMP0_1
1
f
When the Tamp. Switch is pressed, it is Lo status. (Normal, no
issue) Unpressed, it is Hi status. (NG, 4.5V +/- 5%)
GND
2
–
–
SD_NO_TAMPER_O
3
g
Notice!! This pin is connected to a battery.
Don't measure this line by any equipment in board slot-in condition.
J10 To Fan Driver BD – E (CN9820)
Note: Pin to Pin
J17 To Ballast 1 Control Interface
Note: Pin to Pin
J18 To Ballast 2 Control Interface
Note: Pin to Pin
J11 NTC1
J12 NTC2
J28 Tamper Switch
Summary of Contents for NP-NC900C-A
Page 199: ......
