LG LSC27926 Service Manual page 24

1-3. Reset circuit
The RESET circuit allows various parts of the MICOM, such as RAM, defrosting, etc., to be restarted from the initial state
when power is interrupted or restored. A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset
itself. During normal operation, the voltage at the reset terminal is 5 Vdc. If the reset fails, the MICOM will not operate.
1-4. Load/dispenser operation, door opening circuit
1. LOAD DRIVING CIRCUIT
The fan operates at the regular speed even if the door of the refrigerator or freezer is opened. When the doors are closed,
the fan reverts to its original speed.
(A), (B), (C), and (D) of door switch for the freezer or refrigerator are connected to the door open sensing circuit in paralle
toward both ends of switch to determine door open at MICOM.
In the TEST mode, the fan will stop if any door is opened. It will resume operation when the door is closed.
Type of Load Compressor
Measuring part (IC6)
O N
Status
O F F
1) Check load driving status
Type of Load
Measuring part
O N
Status
O F F
2) Lever Switch sensing circuit
Measuring part
Lever S/W
On(Press)
O F F
Frost Removal
Heater
IC6-16 IC6-13
GEARED
MOTOR
IC6-11
5 V
0 V
AC Converting
Relay
IC6-12
W i h t n i 1 V
1 2 V
WATER VALVE
SOLENOID
CUBE
IC6-10 IC7-15
W i h t n i 1 V
1 2 V
IC1(Micom) (No. 16)
5 V
-24-
Refrigerator
LAMP
IC6-15 IC6-14
SOLENOID
DISPENSER
WATER
IC7-13
(60 Hz)
Dispensor
Heater