LG GR-B-L207EC-ER Service Manual ▷ View online
1-10. Key Button Input and Display Lighting Circuit
1. GR-P247, GR-P207, GR-L247, GR-L207
This circuit is to judge the work of function control button on the operation panel and to light each function indication led
(LED module). It is driven by SCAN method.
(LED module). It is driven by SCAN method.
2. GR-C247, GR-C207, GR-B247, GR-B207
MICOM CIRCUIT DESCRIPTION
- 41 -
FRZ
TEMP
REF
TEMP
SELECT
R
S
T
Max
Min
F1
F2
F3
F4
F5
R1
R2
R3
R4
R5
Freezer
Temp
Control
Temp
Control
Refrigerator
Temp
Control
Temp
Control
Crushed
/Water
/Cube
/Water
/Cube
Freezer
Temp
Control
Temp
Control
Refrigerator
Temp
Control
Temp
Control
2. Sensor Resistance Characteristic Table
• Tolerance of sensor resistance is
±
5 %.
• Leave the sensor at measuring temperature for more than 3 minutes when measuring sensor resistance.
(necessary due to detecting speed)
• It is desirable to use digital tester as analogue tester has wider measuring temperature.
• Disassemble refrigerator sensor 1 and 2 from CON8 of main PWB assembly and measure it with digital tester.
• Disassemble freezer sensor from CON7 of main PWB assembly and measure it with digital tester.
MICOM CIRCUIT DESCRIPTION
- 42 -
Measured Temperature (
°
C)
Freezer Sensor
Refrigerator Sensor 1 and 2, Defrost Sensor and
Open Air Sensor
-20
°
C
22.3 k
Ω
77 k
Ω
-15
°
C
16.9 k
Ω
60 k
Ω
-15
°
C
13.0 k
Ω
47.3 k
Ω
-5
°
C
10.1 k
Ω
38.4 k
Ω
0
°
C
7.8 k
Ω
30 k
Ω
+5
°
C
6.2 k
Ω
24.1 k
Ω
+10
°
C
4.9 k
Ω
19.5 k
Ω
+15
°
C
3.9 k
Ω
15.9 k
Ω
+20
°
C
3.1 k
Ω
13 k
Ω
+25
°
C
2.5 k
Ω
11 k
Ω
+30
°
C
2.0 k
Ω
8.9 k
Ω
+40
°
C
1.4 k
Ω
6.2 k
Ω
+50
°
C
0.8 k
Ω
4.3 k
Ω
1-4. Load/Dispenser Operation, Buzzer Driving, Door Opening Detecting Circuit
1. LOAD DRIVING CIRCUIT
* Freezer fan motor shall stop when freezer or refrigerator door is open. Freezer fan motor shall immediately operate when
freezer or refrigerator door is closed.
* Door switches A, B, C, D, E, F of freezer and refrigerator are connected to the door opening detecting circuit in Micom.
* Home bar door switch E, F is parallelly connected to the refrigerator door switch C, D. Therefore it can detect door opening
when one of the door is open.
1) GR-P247, GR-P207, GR-L247, GR-L207
MICOM CIRCUIT DESCRIPTION
- 32 -
Refrigerator
Machine
Defrost
AC Converting
Heater, Plate
Fan Motor
Load Types
Room
Heater
Relay
(W/TANK)
High
Standard
Speed
Speed
Measuring Locations(IC 6)
No.10
No.11
No.12
No.16
No.13
No.14
Condition
ON
Below 1 V
OFF
12 V
POWER
2) GR-C247, GR-C207, GR-B247, GR-B207
* Freezer fan motor shall operate when freezer, refrigerator, or home bar door is open.
* Door switches A, B, C, D of freezer and refrigerator are connected to door opening detecting circuit in Micom.
* Home bar door switch E, F is parallelly connected to the refrigerator switch C, D. Therefore it can detect door opening
when one of the door is open.
MICOM CIRCUIT DESCRIPTION
- 33 -
Refrigerator
Machine
Defrost
AC Converting Refrigerator
Home Bar
Fan Motor
Load Types
Room
Heater
Relay
Compartment Lamp
Heater
High
Standard
Speed
Speed
Measuring Points(IC 4)
No.10
No.11
No.12
No.16
No.15
No.13
No.14
Conditions
ON
Below 1 V
OFF
12 V
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