NEC NP-NC900C-A Service Manual page 28

J29 Tamper Switch
TAMP1_1
GND
SD_NO_TAMPER_O
J30 Tamper Switch
TAMP2_1
GND
SD_NO_TAMPER_O
J24 for Notch Filter SW
3.3V
–
3.3V
J25 for Lamp Door 1
3.3V
3.3V
J52 for Lamp Door 2
3.3V
–
3.3V
J26 for Lamp Thermostat
3V3
3V3
J52 Open Lamp2 Door open
J27 Open Lamp2 cover temp (Reserved)
J26 Open Lamp1 cover temp
J4 Open Interlock SW NG
J25 Open Lamp1 Door open
J24 Open Notch Filter Door Open
J33 between pin 1&3 Open Lamp2 Model Insert NG (Reserved)
J33 between pin 4&6 Open Lamp1 Model Insert NG (Reserved)
Note: (1) X: Don't Core (2) 1: Hi Level 0: Lo Level
J4 To Interlock BD
5V
Photo Diode positive, (input)
Photo Diode positive, (output)
GND
"Confidential, Do Not Duplicate without written authorization from NEC."
TROUBLESHOOTING
When the Tamp. Switch is pressed, it is low status. (Normal, no
f
1
issue) Unpressed, it is Hi status. (NG, 4.5V +/- 5%)
2 – GND
Notice!! This pin is connected to a battery.
g
3
Don't measure this line by any equipment in board slot-in condition.
When the Tamp. Switch is pressed, it is low status. (Normal, no
1 f
issue) Unpressed, it is Hi status. (NG, 4.5V +/- 5%)
2 – GND
Notice!! This pin is connected to a battery.
g
3
Don't measure this line by any equipment in board slot-in condition.
Normal: 3V3/Other voltage: SLAVE uC BD 3V3 suppling is
1 f
something wrong.
2 – –
Normal: 3V3/Other voltage: (1) Notch filter is not at right position.
3 g
(2) Notch Filter Switch had broken.
f
1 Normal: 3V3/Other voltage: Check J24.
Normal: 3V3/0V: (1) Lamp Door 1 had been opened.
2 –
(2) Lamp Door 1 switch had broken.
1 f Normal: 3V3/Other voltage: Check J24.
2 – –
Normal: 3V3/0V: (1) Lamp Door 2 had been opened.
3 g
(2) Lamp Door 2 switch had broken.
1 f Normal: 3V3/0V: To go back to check J25
Normal: 3.3V/0V: Lamp Thermostat is detecting the lamp (s) is (are)
2 g
temperature.
LMP2_Dr_NG Lamp2_OTP
1 X
X 1
X 1
X X
X 1
X 1
X X
X X
Normal: 5V3/0V: Check PTC3 resistor value by Multimeter. (Normal
g
1
value < 10ohm)
f
2 Normal: 5V/0V: The circuit loop between pin1 & pin2 is opened.
3 g Normal: 0V/5V: The circuit loop between pin3 & pin4 is opened.
4 – GND
4-18
Lamp1_OTP Interlock_ExIO LMP_Dr_NG
X X X
0 X 0
1 X 0
X 1 X
1 X 1
1 X 1
X X X
X X X
Notch_NG LMP1_CONTn LMP2_CONTn
X X X
0 X X
0 X X
X X X
0 X X
1 X X
X X 1
X 1 X