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Model
GR-267
Pages
127
Size
22.52 MB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
gr-267.zip
Date

LG GR-267 Service Manual ▷ View online

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.
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.
• 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      
3-8. Temperature Compensation and Overcooling and Less Cooling Compensation Circuits
1. Freezer Compartment, Refrigerator Compartment Temperature Compensation
• Temperature Compensation versus Compensation Resistance (the temperature difference compared to the present
temperature)
EX) If the compensation resistance (RCR1) of refrigerator compartment is changed from 10k
to 18k
(revised
resistance), the temperature of refrigerator compartment goes up by +1
°
C. 
MICOM FUNCTION AND CIRCUITS
- 42 -
R19
10K
RCR1
10K
R20
10K
Refrigerator Compartment
Temperature Compensation
56
57
RCF1
10K
IC1
(MICOM)
P60
(AIN0)
P61
(AIN1)
Freezer Compartment
Temperature Compensation
Freezer Compartment
Refrigerator Compartment
Resistance
Temperature
Resistance
Temperature
Remarks
(RCF1)
Compensation
(RCF1)
Compensation
180k
+5
°
C
180k
+2.5
°
C
Compensate to be
56k
+4
°
C
56k
+2.0
°
C
warmer
33k
+3
°
C
33k
+1.5
°
C
18k
+2
°
C
18k
+1.0
°
C
12k
+1
°
C
12k
+0.5
°
C
10k
0
°
C
10k
0
°
C
Standard temperature
8.2k
-1
°
C
8.2k
-0.5
°
C
5.6k
-2
°
C
5.6k
-1.0
°
C
3.3k
-3
°
C
3.3k
-1.5
°
C
2k
-4
°
C
2k
-2.0
°
C
Compensate to be
470
-5
°
C
470
-2.5
°
C
cooler
The temperature compensation for refrigerator compartment is in the following Table.  
• The adjustment method for the freezer temperature is the same as that for the refrigerator. The temperature compensation
in the freezer are twice as much as that in the refrigerator. 
• This circuit is aimed to input the necessary temperature compensation values into the MICOM in order to adjust the
refrigerator temperature which is different in each model.
MICOM FUNCTION AND CIRCUITS
- 43 -
Revised resistance
470
2k
3.3k
5.6k
8.2k
10k
12k
18k
33k
56k
180k
Present resistance
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
2.5
°
C
3
°
C
3.5
°
C
4
°
C
4.5
°
C
5
°
C
470
change
Up
Up
Up
Up
Up
Up
Up
Up
Up
Up
0.5
°
C
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
2.5
°
C
3
°
C
3.5
°
C
4
°
C
4.5
°
C
2k
Down Change
Up
Up
Up
Up
Up
Up
Up
Up
Up
1
°
C
0.5
°
C
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
2.5
°
C
3
°
C
3.5
°
C
4
°
C
3.3k
Down
Down
Change
Up
Up
Up
Up
Up
Up
Up
Up
1.5
°
C
1
°
C
0.5
°
C
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
2.5
°
C
3
°
C
3.5
°
C
5.6k
Down
Down
Down
Change
Up
Up
Up
Up
Up
Up
Up
2
°
C
1.5
°
C
1
°
C
0.5
°
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
2.5
°
C
3
°
C
8.2k
Down
Down
Down
Down
Change
Up
Up
Up
Up
Up
Up
Refrigerator
2.5
°
C
2
°
C
1.5
°
C
1
°
C
0.5
°
C
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
2.5
°
C
(R2)
10k
Down
Down
Down
Down
Down Change
Up
Up
Up
Up
Up
3
°
C
2.5
°
C
2
°
C
1.5
°
C
1
°
C
0.5
°
C
No
0.5
°
C
1
°
C
1.5
°
C
2
°
C
12k
Down
Down
Down
Down
Down
Down
Change
Up
Up
Up
Up
3.5
°
C
3
°
C
2.5
°
C
2
°
C
1.5
°
C
1
°
C
0.5
°
C
No
0.5
°
C
1
°
C
1.5
°
C
18k
Down
Down
Down
Down
Down
Down
Down
Change
Up
Up
Up
4
°
C
3.5
°
C
3
°
C
2.5
°
C
2
°
C
1.5
°
C
1
°
C
0.5
°
C
No
0.5
°
C
1
°
C
33k
Down
Down
Down
Down
Down
Down
Down
Down
Change
Up
Up
4.5
°
C
4
°
C
3.5
°
C
3
°
C
2.5
°
C
2
°
C
1.5
°
C
1
°
C
0.5
°
C
No
0.5
°
C
56k
Down
Down
Down
Down
Down
Down
Down
Down
Down
Change
Up
5
°
C
4.5
°
C
4
°
C
3.5
°
C
3
°
C
2.5
°
C
2
°
C
1.5
°
C
1
°
C
0.5
°
C
No
180k
Down
Down
Down
Down
Down
Down
Down
Down
Down
Down
Change
2. The circuits for less cooling and overcooling compensation in a refrigerator compartment
• When R-2 is cut, the temperature of refrigerator compartment will be compensated by -2
°
C, regardless of R-1 cut. 
When R+2 is cut, the temperature of refrigerator compartment will be compensated by +2
°
C, regardless of R+1 cut. 
• R+1 is cut while it is being compensated by -2
°
C as R-2 is cut, it will be then compensated by -1
°
C as (-2
°
C)+1
°
C equals
to  -1
°
C. 
• The above OPTION circuit is to compensate refrigerator temperature by simply cutting during service.
MICOM FUNCTION AND CIRCUITS
- 44 -
36
R+1
R+2
R–1
35
34
33
P33
P32
P31
P30
IC1
(MICOM)
R–2
R21
R22
4. 7K
X
4
R23
R24
LESS COOLING 
OVERCOOLING
COMPENSATION
COMPENSATION
REFRIGERATOR TEMPERATURE
REMARKS
R-1
R-2
R+1
R+2
COMPENSATION VALUES
0
°
C(AT FACTORY)
CUT
-1
°
C
CUT
-2
°
C
CUT
+1
°
C
CUT
+2
°
C
CUT
CUT
-2
°
C
CUT
CUT
+2
°
C
CUT
CUT
0
°
C
CUT
CUT
+1
°
C
CUT
CUT
-1
°
C
CUT
CUT
0
°
C
CUT
CUT
CUT
-1
°
C
CUT
CUT
CUT
0
°
C
CUT
CUT
CUT
CUT
0
°
C
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