Samsung RF4287HARS Service Manual page 76

AW3 SM-EN 2011.3.31 2:56 PM 페이지77 in
TROUBLESHOOTING
9) If Humidity Sensor has trouble
ERROR Code
** Measuring point of resistance value according to
Sensor"
Humidity : CN30#1↔ #3
Resistance value with opened : about 50Ω
** 0Ω: Short trouble / ∞Ω: Open trouble
Refer to circuit diagram in the manual
Sensor MICOM/Connector number
Humidity Connector CN30-"3"(brown) to
REG1 HEAT-SINK PCB typical Ground
Voltage measured between 3.5V ~ 1.0V
Measuring voltage of ICO1 MICOM #73,
CN30-"3"(Brown) and REG1, HEAT SINK from
PCB typical Ground part are similar.
→ Check the Resistance, R321
☞ Checking method ofHumidity Sensor resistance
CN30-"3"(Brown)↔ "1"(Gray)
- Compare the temperature table after the measure.
Start Start
Is MAIN PCB Connector
CN30 to CN30 inserted
correctly?
YES YES
Is Humidity Sensor
unit normal?
YES YES
Is the voltage between
MAIN PCB Connector CN30-"3"(Brown) and REG1, Heat
Sink normal?
YES YES
Is input voltage of
ICO1 MICOM #73 normal?
YES
No trouble with PCB temperature sensor.
Recheck the bad contact ofthe connection
☞ Checking method ofHumidity Sensor voltage.
- Measure the voltage of Resistance, R321(IC01 MICOM #73)
on PCB or CN30-"3"(Brown) ↔ REG1, HEAT SINK
- Compare the temperature table after the measure.
Measuring voltage of CN30-"3"(Brown) ↔ REG1, HEAT SINK
are below
77
NO
Bad contact of connector /insert correctly
NO
Replace the Humidity Sensor
DATA2. Humidity Sensor Table
NO (1.0V > Measurement < 3.5V)
Recheck the PCB & Wire Terminal connection
NO
Check the iced-solder, solder
bringing, disturbed solder
Exchange the PCB
Typical PCB Ground
REG1 HEAT-SINK