LG GR-267 Service Manual ▷ View online
2. DISPENSER OPERATION CIRCUIT
1) LOAD DRIVING CONDITION CHECK
2) LEVER SWITCH SENSOR CIRCUIT
MICOM FUNCTION AND CIRCUITS
- 38 -
LOAD TYPE
GEARED
SOLENOID
WATER VALVE
SOLENOID
HOME BAR
MOTOR
CUBE
ICE
WATER
DISPENSER
HEATER(option)
Measuring Point(IC 5)
No.11
No.12
No.13
No.14
No.15
No.16
Conditions
ON
Below 1V
OFF
12V
Measuring Point
Lever S/W
IC1(Micom) No. 45
On(Press)
OFF
5V
0V
(60Hz)
5V
3. BUZZER DRIVING CIRCUIT
4. DOOR OPENING SENSOR CIRCUIT
* If door opening sensor switch ( A - B ) or lead wire is defective, door opening is not detected even freezer door switch is
in normal conditions.
* Refrigerator lamp shall not be ON if refrigerator door switch does not sense door opening sensor switch ( C - D ) or home
bar door switch.
MICOM FUNCTION AND CIRCUITS
- 39 -
IC1
(MICOM)
P51
(INT4/TC4)
50
51
R66
4.7K
Q3 C106M
P52
(PWM/PDO)
R62
4.7K
Q2 A106M
R63 1K
BUZZER
R65
1K
1K
R64 220
+
CE13
47uF
/25V
47uF
/25V
P17
(S02)
48
44
CC20
104
R50
2K
R51
2K
H/BAR-DOOR S/W
CON8
CON7
P43
(SM)
5
6
CC17
104
R46
2K
R47
2K
F-DOOR S/W
(Freezer)
5
6
IC1
(MICOM)
A
B
C
D
R-DOOR S/W
(Refrigerator)
(Refrigerator)
CONDITIONS
WHEN PRESSING CONTROL DISPLAY
WHEN WARNING DOOR
MEASURING POINT
BUTTON, IT SOUNDS BELL (DING-DONG)
OPENING, IT SOUNDS BEEP
OFF
IC1(No. 50Pin)
0V
IC1(No.51Pin)
0V
MEASURING POINT
FREEZER AND REFRIGERATOR DOOR
IC1(MICOM) (No. 44, 48PIN)
CLOSED
5V(Switch of A - B , C - D is OFF state)
OPEN
0V(Switch of A - B , C - D is ON state)
0.05s
2.63kz(DING)
2.63kz(BEEP)
OFF
2.21kz(DONG)
0.2s
0.1s
0.4s
0.5s
0.5s
5V
0V
5V
0V
3-5. Temperature sensor circuit, heater-sheet operation circuit.
The above circuits are freezer and refrigerator sensors to detect the set temperature of freezer and refrigerator, icemaking
sensor to detect water temperature, and defrost sensor which is fixed on the evaporator detects the temperature for defrost.
sensor to detect water temperature, and defrost sensor which is fixed on the evaporator detects the temperature for defrost.
The short or open condition of each sensor is as follows
*As Heater-Sheet is always on, 12V dc is applied to No.1 and No.2 terminals in CON10.
MICOM FUNCTION AND CIRCUITS
- 40 -
SENSOR
CHECK POINT
NORMAL(-30
°
C~50
°
C)
SHORT
OPEN
HOME BAR SENSOR(option)
POINT
a
Voltage
FREEZER SENSOR
POINT
b
Voltage
DEFROST SENSOR
POINT
c
Voltage
REFRIGERATOR SENSOR 2
POINT
d
Voltage
0.5V~4.5V
0V
5V
REFRIGERATOR SENSOR 1
POINT
e
Voltage
ICEMAKING SENSOR
POINT
f
Voltage
ROOM TEMPERATURE
POINT
g
Voltage
63
HEATER-SHEET
(DUCT-DOOR)
H-SENSOR
(HOME BAR-SENSOR)
F-SENSOR
(FREEZER-SENSOR)
R2-SENSOR
(REFRIGERATOR SENSOR 2)
R1-SENSOR
(REFRIGERATOR SENSOR 1)
CON10
CON7
P67
(AIN7)
P64
(AIN4)
P63
(AIN3)
P66
(AIN6)
P65
(AIN5)
CC14
104
R38
2K
RF7
26.1KF
1
IC1
(MICOM)
1
2
3
4
60
CC15
104
R44
2K
RF1
26.2KF
2
59
CC16
104
R45
2K
RF2
26.1KF
3
1
3
2
4
CON8
62
CC18
104
R48
2K
RF3
26.1KF
4
61
CC19
104
R49
2K
RF4
26.1KF
5
1
3
2
4
D-SENSOR
(DEFROST-SENSOR)
ICE MAKER
SENSOR
RT-SENSOR
P62
(AIN2)
CON9
58
CC27
104
R61
2K
RF6
16.7KF
RF5
10KF
6
2
1
P70
(AIN10)
CON6
1
CC28
104
R39
2K
7
13
14
3-6. Switch Input Circuit
The following is the input circuit to detect signals of test switch and electronic single motor damper reed switch to check
refrigerator.
refrigerator.
3-7. Option Designated Circuit (Model Classification Functions)
The above circuit is to designate option of classification for each model and inform to Micom. The designated option and
application standard for each model are as follows.
application standard for each model are as follows.
• This circuit is fixed correctly when the refrigerator is shipped from the factory. Do not add or remove options at your
discretion.
MICOM FUNCTION AND CIRCUITS
- 41 -
R40
4.7K
R53
2K
SINGLE MOTOR
DAMPER
REED S/W
R52
TEST S/W1
2K
CC21
104
P45
(SCK2)
46
P46
(S12)
47
IC1
(MICOM)
7
8
CON 8
40
OP1
OP2
41
P37
P40
IC1
(MICOM)
R25
R26
4. 7K
X
2
Classification
Connecting Conditions
Applicable Standards
Connection
Model with home bar
OP1
Cut
Model without home bar
Connection
Model with dispenser
OP2
Cut
Model without dispenser
