LG LRFD22850ST Service Manual page 28

8-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
POWER
ICE MAKER
LOAD TYPE
Measurement Location (IC6)
ON
Condition
OFF
2. Motors driving circuit
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.
L1
5mH/4A
CM1
470nF
275VAC
CON1
9
VA1
7
5
3
RUNNING CAPACITOR
CON2
COMP
STARTING CAPACITOR
OLP
1
PTC START
M
COOLING-FAN
1
DEF-HEATER FUSE-M
nc com 3
LAMP-F A
B
nc com
DOOR S/W-F
5
nc com
LAMP-R
C
D
com
nc
DOOR S/W-R1&R2
M
7
WATER VALVE
CON3
RC-FILTER
5
3
FRENCH DOOR
HEATER
M
1
VALVE II
RC-FILTER
DEFROSTING
COMP
HEATER
NO.13 NO.14
RY1
IC6
ALZ21B12
KID65003AP
9
D7
10
1N4004
4
13
P06
RY2
G5NB-1A
11
14 3
P05
RY3
G5NB-1A
14
11 6
P02
RY4
G5NB-1A
13
16 1
P03
RY5
G5N-1A
12
15 2
P04
RY6
G5N-1A
9
5
12
P07
8
LAMP
NO.16
1V or below
12V
- 28 -
I C 1
(MICOM)
FRENCH DOOR
HEATER 1, 2 / VALVE
DEW HEATER
NO.12 NO.15