LG LRFD22850ST - Page 28

1N4004
3
CON1
9
11
POWER
3
P07
DOOR S/W-R1&R2
G5N-1A
B
COOLING-FAN
2
1
CM1
CON2
13
RY3
C
5
9
WATER VALVE
G5N-1A
nc
3
15
7
KID65003AP
G5NB-1A
5
VA1
1
FRENCH DOOR
8
com
RY6
com
RY2
11
OLP
RY1
5mH/4A
G5NB-1A
16
M
FUSE-M
5
5
10
nc
com
G5NB-1A
L1
P05
STARTING CAPACITOR
D7
275VAC
P06
RY4
HEATER
12
7
LAMP-R
3
RUNNING CAPACITOR
ALZ21B12
RC-FILTER
470nF
P02
RC-FILTER
D
com
M
14
PTC START
IC6
14
VALVE II
1
ICE MAKER
DOOR S/W-F
CON3
nc
LAMP-F
nc
DEF-HEATER
12
P03
COMP
1
9
4
6
M
RY5
A
P04
13
I C 1
(MICOM)
8-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
LOAD TYPE
COMP
NO.13 NO.14 NO.16 NO.12 NO.15
1V or below
12V
DEFROSTING
HEATER
LAMP VALVE
FRENCH DOOR
HEATER 1, 2 /
DEW HEATER
Measurement Location (IC6)
Condition
ON
OFF
- 28 -
2.1 Fan motor driving circuit (freezing compartment fan)
1. This circuit makes standby power 0 by cutting off power supplied to ISs inside of the fan motor in the fan motor OFF.
2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to motor.
3. This circuit prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by
sensing the operation RPM of the fan motor.
2. Motors driving circuit