Samsung RF4287HARS Service Manual page 71

AW3 SM-EN 2011.3.31 2:56 PM 페이지72 in
TROUBLESHOOTING
4) If Ambient Sensor has trouble
ERROR Code
Temperature table
** Measuring point of resistance value according to
Sensor **
Ambient : CN78#8 ↔ #12 measuring resistance value
** Placed in the right top table of upper hinge.
** 0Ω: Short trouble / ∞Ω: Open trouble
Refer to circuit diagram in the manual
Sensor MICOM/Connector number
Ambient Connector CN78-"8"(Yellow) to
REG1, HEAT-SINK PCB typical Ground
Voltage measured between 4.6V ~ 0.6V.
Measuring voltage of IC01 MICOM CN78-"8"(Yellow)
and REG1, HEAT SINK from
PCB typical Ground part are similar.
→ Check the measure on the Resistance, R315 due to
the SMD MICOM
☞ Checking method of Ambient Sensor resistance
CN78-#"8"(Yellow) ↔ # "12"(Yellow)
- Compare the temperature table after
measurement.
DATA1.
No trouble with PCB and temperature sensor
☞ Checking method of Ambient Sensor voltage
- Measure the voltage of Resistance R315(IC01 MICOM #91) on
PCB or CN78-"8"(Yellow) ↔ REG1, HEAT SINK
- Compare the temperature table after measurement.
Measuring voltage of CN78-"8"(Yellow) ↔ REG1, HEAT SINK
are as below
Start Start
Is MAIN PCB NO
Connector CN31 inserted
correctly?
YES YES
NO
Is Ambient Sensor
unit normal?
YES YES
Is the voltage between NO(0.6V > Measurement < 4.6V)
MAIN PCB Connector CN31#1(Yellow)
and REG1, HEAT SINK normal?
YES YES
NO
Is the input voltage of
IC01 MICOM #72 normal?
YES
Recheck the bad contact of the connection
72
Bad contact of connector/ insert correctly
Replace the temperature sensor
Recheck the wiring connection
Check the iced-solder, solder
bridging, disturbed solder
Typical PCB Ground
REG1 Heater Sink