Circuit Descriptions

10-4) Door S/W Sensing Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Terminal

Operation

Volt(state)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Freezer

DOOR CLOSE

0V

(LOW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DOOR OPEN

5V

(HIGH)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ref.

DOOR CLOSE

0V

(LOW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DOOR OPEN

5V

(HIGH)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

10-5) Temperature Sensing Circuit

# of terminal in MICOM

Remark

 

 

PIN #49 (F-SENSOR)

 

 

Micom

PIN #50 (F-DEF-SENSOR)

terminal

 

PIN #52 (R-SENSOR)

voltage may

change

 

 

according to

PIN #53 (R-DEF-SENSOR)

temp.

 

PIN #56 (EXT-SENSOR)

 

 

 

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.

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Samsung RS2777, RS2544, RS2666, RS2622 manual Door S/W Sensing Circuit, Temperature Sensing Circuit, Micom, Change