Samsung RF4287HARS Service Manual page 74

AW3 SM-EN 2011.3.31 2:56 PM 페이지75 in
TROUBLESHOOTING
7) If Ice Room Sensor has trouble
ERROR Code
Temperature table
** Measuring point of resistance value according to
Sensor **
Ambient : CN78#10 ↔ CN76#1 Measure the
resistance value
** 0Ω: Short trouble / ∞Ω: Open trouble
Refer to the circuit diagram in this manual
Sensor MICOM/Connector number
Ice Room Connector CN78-"10"(Orange) and REG1,
HEAT SINK from typical PCB Ground
Voltage measured between 4.6V ~ 0.6V.
Measuring voltage of IC01 MICOM #90,
CN78-"10"(Orange) and REG1, HEAT SINK from
typical PCB Ground are similar.
→ Check the measure on the Resistance, R316 due
to the SMD MICOM
☞ Checking Mehod of Ice Room Sensor voltage
CN78-"10"(Orange) ↔ CN76-"1" (Gray)
- Compare with the temperature table after
measurement.
DATA1.
No trouble with PCB and temperature sensor.
☞ Checking Method of Ice Room Sensor Voltage
- Measure the Resistance, R316(IC01 MICOM #90) on PCB or
CN78-"10"(Orange) ↔ REG1, HEAT SINK
- Compare with the temperature table after measurement.
Measured voltage of CN78-"10"(Orange) ↔ REG1, HEAT
SINK are as below
Start Start
NO
Is MAIN PCB
Connector CN31 and CN76 inserted
correctly?
YES YES
NO
Is Ice Room Sensor
unit normal?
YES YES
Is the voltage between NO(0.6V > Measurement < 4.6V)
MAIN PCB Connector CN31-"3"(Orange)
and REG1, HEAT SINK normal?
YES YES
NO
Is the input voltage of
IC01 MICOM #71 normal?
YES
Check the bad connections.
75
Bad contact of connector/ insert correctly
Replace temperature sensor
Check the wiring connection
Check the iced-solder, solder
bridging, disturbed solder
Typical PCB Ground
REG1, HEAT SINK