LG LSC27926, Service Manual, Page: 24 / 101

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.
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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.
Measuring part (IC6) IC6-16 IC6-13 IC6-12 IC6-15 IC6-14
Status
V 1 n i h ti W N O
V 2 1 F F O
Type of Load Compressor
Frost Removal
Heater
AC Converting
Relay
Refrigerator
LAMP
Dispensor
Heater
1) Check load driving status
2) Lever Switch sensing circuit
Measuring part
Lever S/W
IC1(Micom) (No. 16)
On(Press)
V 5 F F O
0 V
(60 Hz)
5 V
Measuring part IC6-11 IC6-10 IC7-15 IC7-13
Status
V 1 n i h ti W N O
V 2 1 F F O
Type of Load
GEARED
MOTOR
SOLENOID
CUBE
WATER VALVE
WATER
SOLENOID
DISPENSER