LG GR-N389SQF Service Manual ▷ View online
(3)BUZZER OPERATION CHECK
- 23 -
DISPLAY FUNCTION BUTTON RING
DOOR OPEN ALARM
(DING~ DONG~)
(SCREECHING)
OFF
IC1 (No.14 Pin)
ov
IC1 (No.13 Pin)
ov
MEASURING
POINT
POINT
CONDITIONS
0.05s
0.2s
0.1s
1s
0V
5V
0V
5V
0V
5V
0V
5V
0.5s
0.5s
2.66kh
z (DING~)
2.232kh
z (DONG~)
3.1kh
z
OFF
5) TEMP SENSOR CIRCUITS
The above circuit reads the surrounding temperature, DEFROSTING temperature and FREEZER ROOM temperature into
MICOM(IC1). OPEN or SHORT state of each SENSOR is as follows.
MICOM(IC1). OPEN or SHORT state of each SENSOR is as follows.
6) SWITCH INPUT CIRCUIT
The following circuit is a test switch input circuit for checking the refrigerator.
- 24 -
(RT– SENSOR)
(DEFROST SENSOR)
(FREEZER COMPARTMENT
SENSOR)
SENSOR)
SENSOR
CHECK POINT
NORMAL (-30
°
C~50
°
C)
SHORT
OPEN
ROOM TEMPERATURE
SENSOR
POINT A Voltage
DEFROST SENSOR
POINT B Voltage
0.5V ~ 4.5V
0V
5V
FREEZER SENSOR
POINT C Voltage
7) TEMPERATURE COMPENSATION
• TEMPERATURE COMPENSATION TABLE by adjusting resistance values. (the temp difference compared to the present
temp.)
eg) If the compensation resistance of freezer compartment is changed from 10K (present resistance) to 18K (revised
resistance), the temp of freezer compartment goes up by +2
°
C.
- 25 -
FREEZER TEMPERATURE
COMPENSATION
FREEZER ROOM
RESISTANCE VALUES(R1)
TEMPERATURE COMPENSATION
REMARKS
180 k
Ω
+ 5.0
°
C
COMPENSATE WARMLY
56 k
Ω
+4.0
°
C
33 k
Ω
+3.0
°
C
18 k
Ω
+2.0
°
C
12 k
Ω
+1.0
°
C
10 k
Ω
0
°
C
STANDARD
8.2 k
Ω
-1.0
°
C
5.6 k
Ω
-2.0
°
C
3.3 k
Ω
-3.0
°
C
2 k
Ω
-4.0
°
C
470
Ω
-5.0
°
C
COMPENSATE COOLLY
4. MAIN PWB ASS'Y AND PARTS LIST
1) MAIN PWB ASS'Y
- 29 -
DIP
CE1
+
CM1
CM2
+
+
CE2
CE6
CE3
+
J06
J07
J01
+
IC3
CC1
CC2
CE4
+
CE5
D5
OP2
R21
OP1
R20
CC4
R6
CC10
R19
J05
J10
J11
J02 R7 J04
RF3
R10
R1
CC8
CC7
R16
R15
R17
RF2
RF1
TEST
R13
R12
R11
IC4
J09
IC1
CC3
J08
6871JB1037
STICKER
J12
Q1
J13
Q2
J14
Q3
R14
CC6
CC5
OSC1
R8
R9
CC9
1
D
6
R-DOOR
F
CON3
RT-SENSOR
9
1
CON2
98 12
COMP
F-FAN
D-HEATER
CON1
VA1
RY2
RY3
RY1
D8
D7
J15
D6
R4 R18 R3
BUZZER
Q4
IC6
TRANS
D1
D3
D4
D2
IC2
Click on the first or last page to see other GR-N389SQF service manuals if exist.