Samsung RS757LHQESR/ Series Service Manual page 55

DISASSEMBLY AND REASSEMBLY
4) When Defrost does not work
Refer to the Self-Diagnosis
Function in this manual
F-SEN:Measure the voltage between CN2 #1-#5
F-DEF-SENSOR :Measure the voltage between CN2 #1-#6
R-SEN : Measure the voltage between CN3 #1-#3
R-DEF-SENSOR :Measure the voltage between CN3 #2-#3
(After measuring it, compare it with the value
on the Voltage & Temperature Comparison Table)
Refer to the Test Function in this
Manual
▶ Measure F-DEF-SEN Voltage
-. After measuring it, compare it with the value on the
Voltage & Temperature Comparison Table
Check the related sensors if they
are defective.
Note When the temperature of the F/R
Sensor goes over +20℃ and +17℃ with the
Defrost Heater on, it stops heating and it goes
back to Cooling Operation.
Refer to the Relay Test Method.
- Fridge Defrost : RY74
- Freezer Defrost : RY73
START
F/ R Defrost Sensor is normal?
(Check it with Self-Diagnosis)
YES
The Sensor Temperature
Value is lower than -5℃?
YES
Do F/R Forced Defrost at
the same time.
YES
Power is applied to
Defrost Heater.
YES
NO
After heating up for a certainduration,
it goes back toCooling Operation?
YES
Normal
Case and MAIN PCB
Connection is normal?
YES
Repair Defective Relay or replace PCB
Assy
54
NO
Replace Defective Sensor
NO
Forced Operati o n for a certai n durati o n
NO
NO
Repair Connector