8-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
2. 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.
- 27 -
FREEZER DOOR
SWITCH
REFRIGERATOR
DOOR SWITCH
LOAD TYPE
COMP
NO.13
NO.14
NO.16
NO.12
NO.15
1V or below
12V
DEFROSTING
HEATER
LAMP
TCM
POWER MODE
(OPTIONAL)
VALVE
(DISPENSER
MDL)
Measurement Location (IC6)
Condition
ON
OFF
part
part
part
MOTOR OFF
2V or less
0V
5V
MOTOR ON
13V~15V
0V
2V~3V
a
b
c
Summary of Contents for LRDC20731ST
Page 9: ...3854JK1006A GY GRIS GRAY 3854JK1006B GY GRIS GRAY 5 CIRCUIT DIAGRAM 9 ...
Page 36: ...8 5 MAIN PWB ASSEMBLY AND PARTS LIST 8 5 1 Main PWB Assembly 36 ...
Page 37: ...8 5 2 Replacement Parts List 37 ...
Page 38: ...8 5 3 PWB Assembly Display And Parts List 38 SW106 Dispenser Model Best Model ...
Page 63: ...P No 3828JL8005A November 2004 Printed in Mexico ...