LG GR-B-L207EC-ER Service Manual ▷ View online
2. Dispenser Operation Circuits
GR-P247, GR-P207, GR-L247, GR-L207
1) LOAD DRIVING CONDITION CHECK
2) Lever Switch Detecting Circuit
MICOM CIRCUIT DESCRIPTION
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POWER
LOAD TYPE
GEARED
SOLENOID
WATER VALVE
SOLENOID
HOME BAR
Refrigerator
MOTOR
CUBE
ICE
WATER
PILOT
DISPENSER
HEATER
Compartment Lamp
Measuring Points
No.15(IC6)
No.10(IC7)
No.11(IC7)
No.12(IC7)
No.16(IC7)
No.14(IC7)
No.15(IC7)
No.13(IC7)
Conditions
ON
Below 1V
OFF
12V
Measuring Points
Lever S/W
IC1(Micom) No. 17
On(Press)
OFF
5V
0V
(60Hz)
5V
3. Buzzer Driving Circuits
4. Door Opening Detecting Circuits
* Door opening detecting switch ( A - B) can not detect door opening when switch ( A - B) or lead wire is failed even though
freezer door switch is normal.
* Refrigerator lamp shall not be on when refrigerator door switch can not detect door opening detecting switch ( C - D) or
home bar door switch ( E - F).
MICOM CIRCUIT DESCRIPTION
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CONDITIONS
Bell sounds when button on
Beep sounds when warning
MEASURING
dosplay is pressed.
door opening.
OFF
POINTS
IC1 (No. 50 Pin)
0 V
IC1 (No.51 Pin)
0 V
MEASURING POINTS
FREEZER /
IC1 (MICOM) (Pin No. 46 and 48)
REFRIGERATOR DOOR
CLOSED
5 V (A - B, C - D, E - F both ends S/W off conditions)
OPEN
0 V (A - B, C - D, E - F both ends S/W on conditions)
0.05 s
2.63 kz (DING)
2.63 kz (BEEP)
OFF
2.21 kz (DONG)
0.2 s
0.1 s
0.4 s
0.5 s
0.5 s
5 V
0 V
5 V
0 V
5 V
0 V
5 V
0 V
1-5. Temperature Detecting Circuit, Duct Door Heat Working Circuit
The above circuit is fixed in the freezer compartment sensor, refrigerator compartment sensor, ice making sensor, and
defrost sensor. The condition of short or open of each temperature sensor is as follows.
defrost sensor. The condition of short or open of each temperature sensor is as follows.
* 12 Vdc shall be applied to No. 10 and 11 terminals of CON6 as duct door heater is always on.
MICOM CIRCUIT DESCRIPTION
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SENSOR
CHECK POINT
NORMAL(-30
°
C ~ 50
°
C)
SHORT
OPEN
OPEN AIR SENSOR
POINT A Voltage
FREEZER SENSOR
POINT B Voltage
DEFROST SENSOR
POINT C Voltage
0.5 V~4.5 V
0 V
5 V
REFRIGERATOR SENSOR 1
POINT E Voltage
REFRIGERATOR SENSOR 2
POINT F Voltage
DEFROST SENSOR
POINT G Voltage
1-6. Switch Input Circuits
The following circuit is an input circuit to detect the test switch for refrigerator detection and to detect the signal of
electronic single motor damper reed switch.
electronic single motor damper reed switch.
1-7. Option Designation Circuit (Model Classifying Function)
The above circuit is to designate model by option and inform it to MICOM. The option designation and application standard
for each model is as follows.
for each model is as follows.
u
This circuit is fixed in the factory before shipment. Do not add or remove option at your discretion.
1-8. Stepping Motor Working Circuit
Motor rotates as rotating magnetic forms on the coils wound on each phase of stator when Micom pin No. 41 applies “High”
signal to IC6 (TA774AP) and Micom pin No. 42 and 43 produces “High” and ‘Low” signals.
signal to IC6 (TA774AP) and Micom pin No. 42 and 43 produces “High” and ‘Low” signals.
MICOM CIRCUIT DESCRIPTION
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TEST S/W
Classification
Connection Conditions
Application Standard
Connection
Other area (Changable)
OP1
Cut
Domestic
Connection
Model with dispenser
OP2
Cut
Model without dispenser