Samsung RF20HFENB Service Manual page 45

TROUBLESHOOTING
4) If Ambient Sensor has trouble
ERROR Code
DATA1.
Temperature table
** Measuring point of resistance value according to
Sensor **
Ambient : CN31#1 ↔ #3 Measure the resistance value
** Placed in the right top table of upper hinge.
** ∞Ω : Short trouble / ∞Ω : Open trouble
Refer to circuit diagram in the manual
Sensor MICOM/Connector number
Ambient Connector CN31-#1(White) and REG1
Voltage measured between 4.6V ~ 0.6V.
Voltage of IC10 MICOM #59 is same with the
measuring voltage of CN31-#1(White), REG1, &
Heat Sink from PCB common Ground part.
→ Check the measure on the MICOM or, Sensor
Marking #5(R309).
☞ Checking method of Ambient Sensor resistance
CN31-#1(White) ↔ #3(White)
-. Compare with the temperature table after
measuring.
Start Start
Is Main PCB
Connector CN31 inserted
correctly?
YES YES
Is Ambient Sensor unit normal?
YES YES
Is the voltage between
Main PCB Connector CN31-#1(White) and REG1,
Heat Sink normal?
YES YES
Is the input
voltage of IC10 MICOM #59
normal?
YES
No trouble with PCB and temperature sensor.
Recheck the bad contact of the connector.
☞ Checking method of Ambient Sensor voltage
-. Measure the voltage of Sensor Check Point #5(IC10 MICOM
#59) on PCB or CN31-"1"(White) ↔ REG1, Heat Sink.
-. Compare with the temperature table after measuring.
Below is the measuring voltage of CN31- #"1(White) ↔ REG1, Heat Sink
45
NO
Bad contact of connector/Insert correctly
NO
Replace the temperature sensor
NO (0.6V > Measurement < 4.6V)
Recheck the wiring connection
NO
Check the Cold solder joint, short,
solder touch.
Common PCB
Ground of REG1 Heater Sink