Samsung RM255BABB Training Manual page 64

DIAGNOSTIC
6-4) If there is a trouble with self-diagnosis(sensor failure)
- Error in sensor can be seen on the front display of refrigerator. If sensor failure is found when power is initially impressed to refrigerator, the product will
not work, and display is repeatedly blinking in the trouble occurred sensor.
- Even if sensor has failure during the oeration refrigerator will not stop working but can't run the normal cooling operation because of being operated in
the Emergency Operation mode. Thus, be sure to follow instructions in the manual when you make self-diagnosis.
1) If the ambient temperature sensor has trouble
This model has an ambient temperature sensing operation in the panel PCB. The sensed information is communicated
between main PCB and panel PCB. So you must review the causes of failure without disassembling the panel PCB. If it
displays the sensor ERROR in the parts related to the ambient temperature sensor on the panel, it is understood that the
communication with MAIN PCB is normal. In this case, check the sensor unit, missing wires and short & breaking or wires, etc.
See "Ci r cui t Operati o n" and "How To
Check Temperature sensor" i n the
manual . (Check vol t age at both sensor
termi n al s on the upper hi n ge connector of
freezer, or measure resi s tance after
di s assembl i n g the connector.)
Compare the ambi e nt temp wi t h temp Tabl e
when usi n g the measurement method
descri b ed on How To Check Temp
Sensi n g.
Measure the sensor-connected No. 7 No.8, after
di s connecti n g wi r es from the upper hi n ge connector.
2) If the temperature sensor of Refrigerator has trouble (Apply to the other sensor checks.)
See Circuit Operation" and
"How To Check Temperature
Sensing" in the manual.
See Circuit Operation" and
"How To Check Temperature
Sensing" in the manual.
Start
Is Main PCB connector(CN50)
inserted correctly?
YES
Is the ambient temperature
sensor normal?
YES
Is the sensor vol t age measured at the
upper hinge connector normal?
YES
No trouble with PCB and temperature sensor.
Recheck connector for contact failure.
Start
Is the unit of refrigerator
sensor normal?
YES
Is Main PCB connector
(CN30) inserted correctly?
YES
Is the i n serti o n sequence
of connector(CN30) wire identical to
the circuit diagram?
YES
Is the input of voltage to Main
MICOM pin No. 57 normal?
YES
No trouble with PCB and temperature sensor.
Recheck the connector for an error of contact.
63 63
NO
Troubleshoot the connector's contact
failure or missing
NO
Replace temperature sensor.
NO
Check the soldering on the main PCB for
shorts & breaks.
NO
Exchange the temperature sensor.
NO
Troubleshoot the connector's
contact failure or missing
NO
Correct the wrong configuration of connector
wire-if it is not inserted or incorrectly inserted
to coincid with the circuit diagram.
NO
Check the soldering on the main PCB for
shorts & breaks