LG GR-642AVP Service Manual ▷ View online
The following description is basically for GR-642P/GR-702P. For the other models, refer to the diagram of the entire PCB
circuit.
circuit.
7-1 FUNCTION
7-1-1 FUNCTION
1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to
‘Medium’
→
’Medium/High’
→
’High’
→
’Low’
→
’Medium/Low’
→
’Medium’ in order.
2. When the power is initially applied or restored after a power failure, it is automatically set to ‘Medium’.
7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
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Temp
Medium/
Medium/
Control
Low
Low
Medium
High
High
TEMP(˚C)
5
3
2
0
-1
ROOM
REFRIGERATOR
7-2-5 TEMPERATURE SENSOR CIRCUIT
The upper CIRCUIT reads FREEZER and REFRIGERATOR temperature, and DEF-SENSOR temperature for defrosting
and the indoor temperature for compensating for the surrounding temperature, into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows.
and the indoor temperature for compensating for the surrounding temperature, into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows.
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SENSOR
CHECK POINT
NORMAL(-30 °C ~ 50 °C)
SHORT-CIRCUITED
OPEN
Refrigerator Sensor
POINT Voltage
Defrosting Sensor
POINT Voltage
0.5 V ~ 4.5 V
0 V
5 V
Room Temperature Sensor
POINT Voltage
A
B
C
7-2-6 SWITCH INPUT CIRCUIT
* The circuit shown below is the input circuit to detect the signals of the test S/W for checking the refrigerator.
7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT
1. The circuits for less cooling and overcooling compensation in a refrigerator compartment
• The above OPTION circuit is to compensate refrigerator temperature by simply cutting during service.
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CUT
OVER COOLING
LESS COOLING
COMPENSATION
COMPENSATION
REFRIGERATOR TEMPERATURE
REMARKS
JCR1
JCR2
JCR3
JCR4
COMPENSATION VALUES
CUT
+1°C
CUT
CUT
+2°C
CUT
-1°C
CUT
CUT
-2°C
CUT
CUT
0°C
CUT
CUT
0°C
CUT
CUT
CUT
+1°C
CUT
CUT
CUT
-1°C
0°C(AT FACTORY)
7-2-8 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT
➧
The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on
the corresponding function indication LED (LED Module). The drive type is the scan type.
the corresponding function indication LED (LED Module). The drive type is the scan type.
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Click on the first or last page to see other GR-642AVP service manuals if exist.