Samsung SR-688EV - Circuit Operating Theory; Power Supply Circuit Operation

Samsung Electronics 17
8-3 Door S/W sensing part
8-4 “V” motor, location sensing part ( Reed S/W)
1) When the door is opened, the door S/W closed and MICOM input is ‘Low’.
Then the door-open is sensed.
2) When the door is closed, the door S/W is opened and MICOM input is ‘high’.
Then the door closed is sensed.
1) “V” motor’s location sensing which is for G.A. fuzzy control is done by reed S/W.
2) There occure a “high” to “Low” and “Low” to “High” conversion period on con02 pin6 by the
motion of swing fan. “V” motor’s location is detected by it
DOOR
F
R
Door Conditions
CLOSE
OPEN
CLOSE
OPEN
Door S/W Contact
CLOSE
OPEN
CLOSE
OPEN
CON06
PIN NO
1
3
Micom Input Voltage
“HIGH”
“LOW”
“HIGH”
“LOW”