Temperature Sensor - Samsung SR-L677EV Service Manual

Door Conditions
DOOR
CLOSE
F
OPEN
CLOSE
R
OPEN
1) If door is open, door S/W contact is closed. Then MICOM receives "low" signal and detects
door open then, Relay control circuit receives "HIGH" signal and turn Lamp on.
2) If door is closed, door S/W contact is open. Then MICOM receives "high" signal and detects
door close then, Relay control circuit receives "LOW" signal and turn Lamp off.

6-5. Temperature Sensor

1) The sensor uses the characteristics of thermistor. If temperature goes higher, resistance goes
lower. On the contrary, if temperature goes lower, resistance goes higher.
2) MICOM input voltage is counted by sensor as follows.
R
TH
V =
F
R + R
TH 301
3) For the resistance information on temperature and MICOM input voltage, please refer the
conversion table. (Page. 41)
Door S/W Contact
(V : 5V, R
CC
X Vcc
OPEN
CLOSE
OPEN
CLOSE
( Air Sensor)
When Sensor is open
MICOM input "HIGH"
: Sensor reisitance)
TH
21
MICOM
Micom Input Voltage
PIN NO
# 39
# 40
When sensor is cut off
MICOM input "LOW"
"HIGH"
"LOW"
"HIGH"
"LOW"