LG LSC27990ST, Training Manual

Page: 27 / 34

Info Center
Refrigerator Info Center Training
27
Circuit Descriptions
CirCUiT DesCripTions
The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and
the refrigerator. The icemaker sensor detects when ice is made. The defrost sensor determines both the
need for defrosting and the efficiency of the defrost operation. See the table below for voltages and
checkpoints.
Switch entry circuit
The following circuits are sensing signal form the damper motor reed switch for testing and
diagnosing the refrigerator.
Option designation circuit (model separation function)
The circuits shown above vary according to which features are included on your particular model.
1-8. Switch entry circuit
The following circuits are sensing signal form the damper motor reed switch for testing and diagnosing the refrigerator.
(1) GR-G277STSA(LSC27990TT)
1-9. Option designation circuit (model separation function)
(1) GR-G277STSA(LSC27990TT)
The circuits shown above vary according to which features are included on your particular model.
u
These circuits are preset at the factory and cannot be altered.
EXPLANATION FOR MICOM CIRCUIT
- 28 -
Separation Connection Status Application Standard
Connection OptiFresh exist
OP1
OUT OptiFresh don’t exist
The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and
the refrigerator. The icemaker sensor detects when ice is made. The defrost sensor determines both the
need for defrosting and the efficiency of the defrost operation. See the table below for voltages and
checkpoints.
Switch entry circuit
The following circuits are sensing signal form the damper motor reed switch for testing and
diagnosing the refrigerator.
Option designation circuit (model separation function)
The circuits shown above vary according to which features are included on your particular model.
1-8. Switch entry circuit
The following circuits are sensing signal form the damper motor reed switch for testing and diagnosing the refrigerator.
(1) GR-G277STSA(LSC27990TT)
1-9. Option designation circuit (model separation function)
(1) GR-G277STSA(LSC27990TT)
The circuits shown above vary according to which features are included on your particular model.
u
These circuits are preset at the factory and cannot be altered.
EXPLANATION FOR MICOM CIRCUIT
- 28 -
Separation Connection Status Application Standard
Connection OptiFresh exist
OP1
OUT OptiFresh don’t exist
The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and
the refrigerator. The icemaker sensor detects when ice is made. The defrost sensor determines both the
need for defrosting and the efficiency of the defrost operation. See the table below for voltages and
checkpoints.
Switch entry circuit
The following circuits are sensing signal form the damper motor reed switch for testing and
diagnosing the refrigerator.
Option designation circuit (model separation function)
The circuits shown above vary according to which features are included on your particular model.
1-7. Temperature sensing circuit
(1) GR-G277STSA(LSC27990TT)
The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator.
The icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and the
efficiency of the defrost operation. See the table below for voltages and checkpoints.
EXPLANATION FOR MICOM CIRCUIT
- 27 -
SENSOR CHECK POINT NORMAL(-22 °F ~ 122 °F) IN SHORT IN OPEN
Freezing sensor POINT A Voltage
Defrost sensor POINT B Voltage
Refrigerator sensor 1 POINT C Voltage 0.5 V~4.5 V 0 V 5 V
Refrigerator sensor 2 POINT D Voltage
Magic room/ Opti Fresh Sensor POINT E Voltage