Samsung RF195ABRS Service Manual page 50

TROUBLESHOOTING
4-2-4. If defrost does not operate (F, R DEF Heater)
- If defrost has trouble, select the self-diagnostic function to detect the error of defrost heater before Power off. (Check the
function with referring to the self-diagnostic function)
R DEF ERROR
** Measuring point of defrost value according to Heater **
F-DEF : CN72 #7(Brown) ↔ #3(Orange)
measure the resistance value(66/240 ohm ± 10%)
R-DEF : CN72 #5(White) ↔ #3(Orange)
measure the resistance value(103(120)/397ohm ± 10%)
** 0Ω : Short trouble / 0Ω: Open(Bimetal, heater) trouble
** Measuring point of resistance value according to Sensor **
F-DEF : CN30 #6 ↔ #8 measure the resistance value
R-DEF : CN30 #4 ↔ #8 measure the resistance value
** 0Ω : Short trouble /0Ω : Open trouble
Resistance value of sensor according to temperature
86℉(30℃) 4.22㏀
68℉(20℃) 6.05㏀
50℉(10℃) 8.87㏀
32℉(0℃) 13.29㏀
14℉(-10℃) 20.42㏀
-4℉(-20℃) 32.23㏀
-22℉(-30℃) 52.41㏀
** Measuring Point of resistance value according to Sensor **
PCB common Ground REG1 Heater Sink and
F-DEF:CN30 #6 (or Sensor Marking #4(R307),
R-DEF:CN30 #4 (or Sensor Marking #2(R303),
measure the resistance value.
** 0V : Short trouble / 5V : Open trouble
Recheck the applicable sensor which is not
returned.
Reference
If defrost sensor temperature of fridge & freezer are
higher than 50℉(10℃) & 53.6℉(12℃) by the heating
of heater, heating will be finished and returns to the
cooling operation after making a pause.
☞ Checking method of F,R DEF Heater resistance value.
F DEF ; CN72-#7(Brown) ↔ #3(Orange)
R DEF ; CN72-#5(White) ↔ #3(Orange)
-. Check additionally, if resistance values are different after
the measuring.
1) F DEF Heater
Refer to DATA1.
Temperature Table for the
detailed temperature.
Manual defrost of Fridge and
Freezer operate simultaneously.
return to cooling operation after heating
2) R DEF Heater
F DEF ERROR
Start
Are all the defrost
heater normal?
Is defrost sensor by
self-diagnostic normal?
Is the temperature
of defrost sensor lower than
53.6℉(12℃)?
If Power Freeze Key + Fridge Key are pressed
simultaneously for 8 seconds and then select any key, 3rd
Test Mode(Manual defrost) will be operated.
Is power applied to
each defrost heaters?
Does the system
for specified time?
Normal
Is connection
terminal of Main PCB
part normal?
Check bimetal, heater itself
disconnection, wiring connection,
etc.
Replace failure Relay or replace
PCB Ass'y
50
Check the bimetal, heater disconn-
ection itself, wiring connection, etc
Refer to self-diagnostic
function in the manual
Replace and repair the
applicable sensor
Manual operation for a certain period of time
Repair connection terminal