Samsung RF4287HARS Service Manual page 72

AW3 SM-EN 2011.3.31 2:56 PM 페이지73 in
TROUBLESHOOTING
5) If F Sensor has trouble
ERROR Code
Temperature table
** Measuring point of resistance value according to
Sensor **
F :CN30#3 ↔ CN76#1 measuring resistance value
** 0Ω: Short trouble / ∞Ω: Open trouble
Refer to circuit diagram in the manual
Sensor MICOM/Connector number
Connector CN30#3(Red) to
F
REG1, HEAT SINK PCB typical Ground
Voltage measured between 4.6V ~ 0.6V.
Measuring voltage of IC01 MICOM #74,
CN30#3(Red) and REG1, HEAT SINK from
PCB typical Ground part are similar.
→ Check the measure on the Resistance, R309 due to
the SMD MICOM
☞ Checking method of F Sensor resistance CN30-
"4"(Red) ↔ CN76-"1"(Gray)
- Compare the temperature table after measurement.
DATA1.
No trouble with PCB and temperature sensor
☞ Checking method of F Sensor voltage
- Measure the voltage of Resistanec, R309(IC01 MICOM #74) on PCB or
CN30-"4"(Red) ↔ REG1, HEAT SINK
- Compare the temperature table after measurement.
Measuring voltage of CN30-"4"(Red) ↔ REG1, HEAT SINK are as below.
Start Start
Are MAIN PCB NO
Connector CN30 and CN76
inserted correctly?
YES YES
NO
Is F Sensor
unit normal?
YES YES
Is the voltage between NO(0.6V > Measurement < 4.6V)
MAIN PCB Connector CN30#3(Red) and
REG1, HEAT SINK normal?
YES YES
NO
Is the input voltage of
IC01 MICOM #81 normal?
YES
Recheck the bad contact of the connection
73
Bad contact of connector/ insert correctly
Replace temperature sensor
Recheck the wiring connection
Check the iced-solder, solder
bridging, disturbed solder
Typical PCB Ground
REG1 Heater Sink