Samsung SG648, SG688, SG606, BG606, BG60 Circuit Descriptions

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8. Circuit operating theory

8-1 Power supply part

Voltage

(DC 12V)

Vcc (DC 5V)

V12 (DC 12V)

Secondary voltage output of DC trans is sourced 1~3 and 5~7 about 15V. On the ’a’ part, input is rectified and regulated by MC 7812 and is about DC12V. This voltage is applied for relay running and

regulated again by 7805 to transformer. DC 5V is applied to display part after rectified and regulated by

MC7812.

Relay Operation

Power around MICOM & Sensor Detector

LED Display & S/W Detector

Circuit used

8-2 Resetpart

Reset part is intialize RAM of MICOM and others when

KA7533 RESET

power is on or power is interrupted for some time. It will make whole program runs from the first status. When power is supplied, reset voltage is ”low” status for a few seconds and turn into ”High” status in the normal operating.

16 Samsung Electronics

8-3 Door S/W sensing part

DOOR

Door Conditions

OPEN

Door S/W Contact

OPEN

CON06 PIN NO

Micom Input Voltage

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.

8-4 “V” motor, location sensing part ( Reed S/W)

“HIGH”

“LOW”

“HIGH”

“LOW”

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

Samsung Electronics 17

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