LG GR-642APA Service Manual page 30

7-2-9 DISPENSER PUMP MOTOR OPERATION CIRCUIT(OPTION)
Press the DISPENSER PUMP S/W, the MOTOR turns a forward rotate and release the S/W the MOTOR is stop for 0.6
second and turns a reverse rotate for 0.5 second.
MOTOR OPERATION
CHECK POINT
PUMP S/W OPERATION
PUMP MOTOR
OPERATION
PUMP S/W PART
PUMP MOTOR
PART
STATE
RELEASE
PRESS
A FORWARD
ROTATE
STOP
A REVERSE
ROTATE
both ends of CC11
NO. 11 of IC1
NO. 12 of IC1
VOLTAGE CHECK
as MULTIMETER
(connect +, –)
A FORWARD
STOP ROTATE
H L
H H
H L
0V 12V
- 30 -
A REVERSE
STOP ROTATE STOP
0.6 sec 0.5 sec
H H H
H L H
H H H
0V -12V 0V