Samsung RS257BABB Service Manual page 48

Diagnostics
11-4) If there is a trouble with self-diagnosis
- Error of sensor can be seen on the front display of refrigerator. If power is impressed to refrigerator first, an failure of sensor is found. The refrigerator
will stop working and display(blink) the region of trouble-occurred sensor repetitively.
- Even if sensor has failure during the operation, the refrigerator will not stop working but can run the normal cooling operation because of being operated
in the Emergency Operation mode. Therefore you' re requested to use how to check self-diagnosis(at page 26) in the manual.
1) If the ambient sensor has trouble
� See Ref. 4 (descriptions of
circuit operation, and how
to check temperature
sensor in the manual.)
2) If the temperature sensor of R room has trouble
- The sensor of freezer is connected in parallel with Bimetal. See the contents of Temperature Sensing Circuit section in the
description of circuit operation.
� See Ref.4 (descriptions of
circuit operation, and how
to check temperature
sensor in the manual.)
� For sensor resistance per
temperature, make use of
the resistance values from
Ref. 4 and 5.
Start
Was the Panel
– PCB connector(CN10) inserted
correctly?
YES
Is the ambient temperature
sensor normal?
YES
Is the input of voltage to
R301(Panel PCB) normal?
YES
No trouble with PCB and temperature sensor.
Recheck the contact failure of connector.
Start
Is the unit of
Fridge's temperature
sensor normal?
YES
Was the Main – PCB
connector(CN30) inserted
correctly?
YES
Is the sequence of
insertion of connector(CN30) wire identical to
the circuit diagram?
YES
Is the input voltage to
MICOM pin No. 52 normal?
YES
No trouble with PCB and temperature sensor.
Recheck the connector for an error of contact.
48
NO
A bad contact or connector missing?
NO
Exchange the temperature sensor.
NO
Check the iced solder and
short of main-PCB.
NO
Exchange the temperature sensor.
NO
Troubleshoot a bad contact or missing of
connector.
NO
Modify the wrong configuration of connector
wire -in case of being not inserted or
incorrectly inserted - to be coincided with the
circuit diagram.
NO
Check if the iced solder of main PCB is
short.