LG GR-642BEPF Service Manual ▷ View online
2. BUZZER OPERATION CHECK
3. DOOR OPENING PERCEPTION CHECK
7-2-5 DISPENSER PUMP MOTOR OPERATION CIRCUIT(OPTION)
Press the DISPENSER PUMP S/W, the MOTOR turns a forward rotate and release the S/W the MOTOR is stop for 0.6
second and turns a reverse rotate for 0.5 second.
second and turns a reverse rotate for 0.5 second.
"H":5V, "L" :0V
A FORWARD
A REVERSE
STOP
ROTATE
STOP
ROTATE
STOP
PUMP S/W OPERATION
PUMP MOTOR
OPERATION
PUMP S/W PART
both ends of CC14
H
L
H
H
H
NO. 11 of IC1
H
H
H
L
H
PUMP MOTOR
NO. 12 of IC1
H
L
H
H
H
PART
VOLTAGE CHECK
as MULTIMETER
0V
12V
0V
-12V
0V
- 26 -
NO. 15 of IC 5
BUZZER SOUND ON
BUZZER SOUND OFF
12V
0V
12V
(3~4KHZ)
STATE
MEASURING
POINT
NO. 8 of IC 1(MICOM)
OPEN
CLOSE
5V
0V
5V
(50~60HZ)
DOOR
MEASURING
POINT
P05
P04
P06
10
12
11
CC14
223
2K
22K
R43
22K
R38
360(1/2W)
R42
(J)R44
(J)R39
(J)R34
A FORWARD
ROTATE
ROTATE
A REVERSE
ROTATE
ROTATE
A REVERSE
ROTATE
A FORWARD
ROTATE
PUMP
MOTOR
PUMP
S / W
200
Q4
KTA1270 GR
Q1
KTA1270 GR
Q2
KTA1273 Y
KTA1273 Y
Q3
KTC3205 Y
KTC3205 Y
Q6
KTC3205 Y
KTC3205 Y
Q5
KTA1273 Y
KTA1273 Y
D18
D19
D20
D21
R41
10K
2K
2K
R40
10K
R35
200
R36
360(1/2W)
R37
R45
2K
IC1
(MICOM)
1
2
3
4
CON6
M
B
A
0.6 sec
0.5 sec
RELEASE
PRESS
A FORWARD
ROTATE
ROTATE
STOP
A REVERSE
ROTATE
ROTATE
MOTOR OPERATION
STATE
CHECK POINT
7-2-6 TEMPERATURE PERCEPTION 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.
7-2-7 SWITCH INPUT PERCEPTION CIRCUIT
The following circuit is sensing of elec. DAMPER REED S/W and perceive MANUAL TEST S/W. When perceiving INPUT of
MANUAL, TEST MODE performs by this CIRCUIT.
MANUAL, TEST MODE performs by this CIRCUIT.
- 27 -
IC1
(MICOM)
24
P61
(AIN1)
R27
RF1
16.2KF
F1–SENSOR
(FREEZER UPPER)
(FREEZER UPPER)
CON5
2K
CC8 223
A
25
P62
(AIN2)
R28
RF2
26.1KF
D–SENSOR
(DEF–SENSOR)
(DEF–SENSOR)
2K
CC9 223
B
26
P63
(AIN3)
R29
RF3
16.2KF
F2–SENSOR
(FREEZER LEFT)
(FREEZER LEFT)
2K
CC10 223
C
27
P64
(AIN4)
R30
RF4
26.1KF
R1–SENSOR
(REFRIGERATOR MIDDLE RIGHT)
(REFRIGERATOR MIDDLE RIGHT)
2K
CC11
223
D
28
P65
(AIN5)
R31
RF5
26.1KF
R2–SENSOR
(REFRIGERATOR BOTTOM LEFT)
(REFRIGERATOR BOTTOM LEFT)
2K
CC12 223
E
1
2
3
4
5
6
7
8
9
10
IC1
(MICOM)
4.7K
TEST S/W
R46
R33
2K
REED S/W
(MOTOR DAMPER)
(MOTOR DAMPER)
CON5
11
12
CC13 223
R32
9
14
P02
P07
2K
SENSOR
CHECK POINT
NORMAL(-30˚C ~ 50˚C)
SHORT
OPEN
F1-SENSOR
POINT Voltage
D-SENSOR
POINT Voltage
F2-SENSOR
POINT Voltage
1.0V ~ 4.0V
0V
5V
R1-SENSOR
POINT Voltage
R2-SENSOR
POINT Voltage
A
E
D
B
C
7-2-8 OPTION CIRCUIT(SIMPLE REFRIGERATOR TEMPERATURE COMPENSATION)
* THIS OPTION CURCUIT SHOULD BE FOR THE SERVICE OF REFRIGERATOR COMPENSATION WITH A SIMPLE
CUT OF OPTION.
7-2-9 ELECTRONIC MOTOR DAMPER(OR AC DAMPER) OPERATING CIRCUIT
• In the case where electronic motor damper is used in place of the GAS DAMPER to temperature control of the refrigerator,
this circuit is composed of the operating circuit that opens and closes the damper and the REED SWITCH part that detects
the present state of the opening and closing of the damper.
the present state of the opening and closing of the damper.
• If there is no change in the state of the reed switch within 2 minute of the operating of the MOTOR DAMPER, it concludes
as a malfunction and indicates the problem. (Refer to the self testing function)
* When the power is inputted initially, it rotates once regardless of the temperature in order to detect the state of the
DAMPER.
- 28 -
IC1
(MICOM)
4.7K
OP1
OPTION PIN
SIMPLE TEMPERATURE COMPENSATION
OF REFRIGERATOR ROOM
OF REFRIGERATOR ROOM
COMPENSATE A TEMPERATURE OF
REFRIGERATOR ROOM WITH -3˚C
REFRIGERATOR ROOM WITH -3˚C
NOT COMPENSATE
OP1
OPTION PIN
R47
15
P01
IC1
(MICOM)
CC13 223
R33
2K
RY5
G5N–1
D14
IN4148
9
14
3
1
9
P77
P07
8
IC5
KID65003AP
R49
12K/5W
POWER
DAMPER
MOTOR
REED S/W
(MOTOR DAMPER)
R32
2K
M
OPTION
OPTION PIN
FUNCTION
OP1
FUNCTION
NOTE
SHIPPING
STATE OF
CONNECTION
NOT COMPENSATE
STATE
OPTION
COMPENSATE A TEMPERATURE
CUT
OF REFRIGERATOR ROOM WITH –3˚C
* The opening and closing of the DAMPER, the state of the REED S/W are as follows.
- 29 -
1.6 sec
9.1 sec
7.4 sec
1.6 sec
1
2
3
4
ON
OFF
OPEN
CLOSE
OPEN
CLOSE
ON
OFF
ON
OFF
ON
OFF
ON
OFF
REED S/W
MIDDLE BAFFLE
BOTTOM BAFFLE
MOTOR DAMPER
STATE OF THE
NO REFRIGERATOR
BAFFLE
MIDDLE
CLOSE
➀
BOTTOM
CLOSE
MIDDLE
OPEN
➁
BOTTOM
CLOSE
MIDDLE
OPEN
➂
BOTTOM
OPEN
MIDDLE
CLOSE
➃
BOTTOM
OPEN
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