LG GR-267 Service Manual ▷ View online
3-9. The Circuits Of Key Button Input And Display Lighting
The purpose of this circuit is to judge whether the function control buttons in the control display are pressed or not and to
light LED (LED MODULE) for displaying each function. The driving type is SCAN.
light LED (LED MODULE) for displaying each function. The driving type is SCAN.
MICOM FUNCTION AND CIRCUITS
- 45 -
13
12
14
11
10
9
8
6
7
5
4
3
2
1
IC1
(MICOM)
P20
(INT5/STOP)
P17
P16
P15
(TC2)
P14
(PPG)
P13
(DVO)
P12
(INT2/TC1)
P11
(INT1)
P10
(INT0)
P07
P06
P22
(XTOUT)
P70
(AIN10)
15
28
16
17
18
19
20
21
22
23
24
25
1
R39
RF5
10KF
10KF
2K
9
1
18
2
17
3
16
4
15
5
14
2
15
3
14
4
13
5
12
6
11
7
8
16
1
10
R32
R34
2K
R35
100
CC13
102
R33
2K
IC7-2
130.1/2W
R31
130.1/2W
R30
130.1/2W
R29
360.1/2W
R28
360.1/2W
R27
360.1/2W
10
9
IC6
TD62783AP
IC7-1
KID65003AP
CC28
104
SW103
IN4148
X
4
SW102
D108
SW104
D109
SW101
D107
D106
LED
MODULE
12
11
10
Q
W
Q
W
M
N
X
P
U
V
N
K
P
U
V
8
A
A
R
S
T
9
L
K
J
H
G
7
6
5
4
3
2
1
IN4004
X
5
D105
D104
D103
D102
D101
CON101
CON6
RT–SENSOR
B
C
D
E
F
R36
4.7K
2
1
3
4
5
6
8
7
9
10
11
12
13
N
P
F
E
D
C
B
A
E
D
C
B
A
L
K
J
K
J
H
G
A
G
A
Q
R
S
T
U
V
W
M
X
Freezer
Temp
Control
Refrigerator
Temp
Control
Power
Freezer
Crushed/Water/Cube
1. Sensor Resistance Characteristics Table
• The tolerance of sensor resistance is
±
5%.
• Be sure to measure the sensor resistance after keeping the sensor more than 3 minutes at a measuring temperature. (It
needs delay due to sense speed.)
• Use a digital tester if possible, because a measuring temperature is too high for an analogue tester.
• Measure the resistance with a digital tester after disconnecting CON 8 of MAIN PWB ASSY. part as there is no connector
in refrigerator sensor 1 and 2
• Measure the resistance of a freezer sensor with a digital tester after disconnecting CON 7 of MAIN PWB ASSY. part.
MICOM FUNCTION AND CIRCUITS
- 46 -
Measured Temperature
Freezer Sensor
Refrigerator Sensor 1,2, Defrost Sensor, Open Air Sensor
-20
°
C
22.3k
Ω
77k
Ω
-15
°
C
16.9
60k
Ω
-15
°
C
13.0k
Ω
47.3k
Ω
-5
°
C
10.1k
Ω
38.4k
Ω
0
°
C
7.8k
Ω
30k
Ω
+5
°
C
6.2k
Ω
24.1k
Ω
+10
°
C
4.9k
Ω
19.5k
Ω
+15
°
C
3.9k
Ω
15.9k
Ω
+20
°
C
3.1k
Ω
13k
Ω
+25
°
C
2.5k
Ω
11k
Ω
+30
°
C
2.0k
Ω
8.9k
Ω
+40
°
C
1.4k
Ω
6.2k
Ω
+50
°
C
0.8k
Ω
4.3k
Ω
4. PWB Parts Drawing and List
4-1. MAIN PWB ASSY. Parts Drawing
MICOM FUNCTION AND CIRCUITS
- 47 -
CR3
1
6
1
4
1
10
1
8
R-TEMP
.
COMPENSA
TION
F-TEMP
.
COMPENSA
TION
4-2. Parts List
MICOM FUNCTION AND CIRCUITS
- 48 -
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