Samsung RF4287HARS, Service Manual

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71
TROUBLESHOOTING
3) If R DEF Sensor has trouble
Bad contact of connector/ insert correctly
Is MAIN PCB
Connector CN30 and CN76 inserted
correctly?
Is R DEF Sensor
unit normal?
Is the input voltage between
MAIN PCB Connector CN30#8(Skyblue)
and REG1, HEAT SINK normal?
Is the input voltage of IC01
MICOM # 74 normal?
Start
NO
YES
YES
YES
YES
Replace the temperature sensor
NO
Recheck the wire connection part
NO(0.6V > Measurement < 4.6V)
Check the iced-solder, solder bridging,
disturbed solder.
NO
No trouble with PCB and temperature sensor.
Recheck the bad contact of the connection.
** Measuring point of resistance value according to
Sensor **
R-DEF : CN30#8 ↔ CN76#1 measuring
resistance value
** 0 Ω : Short trouble / ∞Ω : Open trouble
Sensor MICOM/Connector Number
Voltage measured between 4.6V ~ 0.6V.
Measuring voltage of IC01 MICOM #78
CN30-"8"(Sky-blue) and REG1, HEAT SINK from
PCB typical Ground part are similar.
→ Check the measure on the Resistance R313 due to the
SMD MICOM
☞ Checking method of R Sensor resistance
CN30#8(Sky-blue)
↔ CN76#1(Gray)
- Compare the temperature table after
measurement.
DATA1.
Temperature table
ERROR Code
Refer to circuit diagram in the manual
R DEF Connector CN30-"8"(Sky-blue) and
REG1, HEAT SINK PCB common Ground
☞
Checking method of R DEF Sensor resistance
- Measure the resistance R313(IC01 MICOM #78) on PCB or
CN30#8(Sky-blue)
↔
REG1, HEAT SINK
- Compare the temperature table after measurement.
Measuring voltage of CN30#8(Sky-blue)
↔ REG1, HEAT SINK
are as below.
Typical PCB Ground
REG1, HEAT SINK
Start
YES
YES
YES
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