LG GR-T692DVQ Service Manual ▷ View online
7-2-4 LOAD/BUZZER DRIVE & OPEN DOOR DETECTION CIRCUIT
1. Load Drive Condition Check
* When the door of the freezer/refrigerator is left open for 10 minutes or longer, the lamp of the freezer/refrigerator turns off
automatically.
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1
1
3
5
7
9
Load Type
Defrosting Heater
Lamp
Measurement Location (IC4)
NO.11
NO.12
NO.13
ON
1V or below
Condition
OFF
12V
Load Type
Comp,
Freezer Fan Motor
Defrosting Heater
Lamp
Machine Room-Fan
Measurement Location (IC4)
NO.10
NO.13
NO.11
NO.123
ON
1V or below
Condition
OFF
12V
Comp,
Freezer Fan Motor
Machine Room-Fan
2. Buzzer Drive Condition Check
3. Open Door Detection Circuit Check
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A
B
Tone (Beep~) when the button on the display is pushed Alarm for open door (beep-beep-beep)
OFF
IC1 ( )
0 V
IC1 ( )
0 V
Measure-
ment Location
ment Location
Condition
0 V
5 V
0 V
5 V
0.5 s
0.5 s
1.9 kH
z
(Beep~)
OFF
0.1 s
0.5 s
0 V
5 V
0 V
5 V
1.9 kH
z
(Beep~)
(PIN NO.28)
Closed
0 V
Open
5 V
Freezer/
Refrigerat Door
Refrigerat Door
Measurement
Location
A
B
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
Freezer Sensor
POINT
Voltage
Refrigerator Sensor
POINT
Voltage
Defrosting Sensor
POINT
Voltage
0.5 V ~ 4.5 V
0 V
5 V
Intake Air Temperature Sensor
POINT
Voltage
A
B
D
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 OPTION SETTING CIRCUIT (MODEL SELECTION FUNCTION)
The circuit shown above is to give the information on the model type option setting to the MICOM. The option setting and
the application are as follows.
the application are as follows.
➧
Since this circuit is properly set at the factory, do not add or remove an option without permission.
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Item
Condition of connection
Application
OP1
Connected
Special Model
Cut
Model for exporting
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