Samsung RS2544 Manuel D’Utilisation

39

1) The terminals, 

②

and 

⑥

of the connector (CN30) are grounded, and DC5V (Vcc) is supplied to the terminals, 

⑤

and

⑥

through the resistors, R404 and R403 for the freezer and the refrigerator door, respectively.

2) The micro-processor senses the door’s open and close based on engaged voltages, “Low(0V)” and “High(5V),”

respectively.

Note) The door switch always should be checked when the evaporator fan is not running while the door is closed.

Terminal

Operation

Volt(state)

Freezer

DOOR CLOSE

DOOR OPEN

0V (LOW)

5V (HIGH)

Ref.

DOOR CLOSE

DOOR OPEN

0V (LOW)

5V (HIGH)

# of terminal in MICOM

Remark

PIN #49 (F-SENSOR)

PIN #50 (F-DEF-SENSOR)

PIN #52 (R-SENSOR)

PIN #53 (R-DEF-SENSOR)

PIN #56 (EXT-SENSOR)

Micom

terminal

voltage may

change

according to

temp.

1)  A thermistor with a negative temperature coefficient (NTC) is used for a temperature sensor.
2)  Resistors, R 306 

∼

R310 and capacitors, C 301 

∼

C 305 are used for a noise protection purpose.

3)  For the F-sensor, the input voltage into the micro processor (MICOM), VF is calculated by (Rth x Vcc)/(R303+ Rth),

where Rth is a corresponding resistance to the thermistor’s output (See Ref. 6 in Appendix).

4) The F-Def sensor is connected with a bimetal and a temperature sensor is in parallel. In a normal operation of the

system, the bimetal is on and 0V is input into the micro-processor. During a defrost cycle, the bimetal will be off from
54

℉

, and a divided voltage with R304 enter to the micro-processor to keep sensing the set temperature.