LG GR-J303TG, Service Manual

Page: 21 / 46

3-2-9. 3-WAY VALVE STEPPING MOTOR DRIVE CIRCUIT (FOR SWITCHING UPPER/MIDDLE/LOWER
COMPARTMENT CYCLE)
As for motor drive, the motor rotates since rotation magnetic force is formed at coils wound around each phase of the motor
and the stator via the IC11 (TD62308AP) as IC for motor drive if outputting “High” “Low” signal as much as the fixed step
numbers from the MICOM pin 50, 47 and 48.
Explanation) For driving method of the motor, send signal in the cycle of 30ms by using the terminal of the MICOM PIN 50,
47, 49 and 48 as shown in waveform of each part below. This signal is output to the output terminal No.10, 15,
7, 2 via the input terminal No.11, 14, 6, 3 of the IC11 (TD62308AP) as IC for motor drive. The motor rotates by
which motor coils wound around each phase of the stator forms rotation magnetic field.
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상칸/중•하칸 CYCLE 절환용
IC12 No.10 (A)
IC12 No.15 (B)
IC12 No.7 (A)
IC12 No.2 (B)
CCW (reverse rotation) CW (positive rotation)