M2 MC2125PALS Service Manual - page 49
50
Diagnostics
10-4) If there is a trouble with self-diagnosis
1) If the ambient sensor has trouble
No trouble with PCB and temperature sensor.
Recheck the contact failure of connector.
YES
YES
YES
2) If the temperature sensor of F and R room has trouble
See Ref. 4 (descriptions of
circuit operation, and how
to check temperature
sensor in the manual.)
- 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 in the manual.
A bad contact or connector missing?
Was the Main
– PCB connector(CN31) inserted
correctly?
Is the ambient temperature
sensor normal?
Is the input of voltage to
MICOM pin No. 63 normal?
Start
NO
Exchange the temperature sensor.
NO
Check the iced solder and
short of main-PCB.
NO
YES
YES
YES
YES
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.
Exchange the temperature sensor.
Is the unit of
Fridge’s temperature
sensor normal?
Was the Main – PCB
connector(CN30) inserted
correctly?
Is the sequence of
insertion of connector(CN30) wire identical to
the circuit diagram?
Is the input voltage to
MICOM pin No. 59 normal?
Start
NO
Troubleshoot a bad contact or missing of
connector.
NO
Check if the iced solder of main PCB is
short.
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
No trouble with PCB and temperature sensor.
Recheck the connector for an error of contact.