Samsung Electronics
6-2
Circuit Description
6-4 When the door is opened during cooking
1. The primary interlock switch is opened to cut off the primary voltage of the high voltage transformer.
Thes stops microwave oscillation.
2. The door sensing switch is opened which signals the touch control circuit. The main relay stays on, the
power control relay turns off and the display stops counting down.
3. The fan motor and turn-table motor are stopped by operation of the primary interlock switch. The oven
lamp lights the inside of the oven again until the door is closed.
4. Upon opening the door, the contacts of the primary interlock switch open and the contacts of interlock
monitor switch close.
5. If the contacts of primary interlock switch do not function properly, the monitor fuse blows out because
of the large current surge (caused by the monitor switch activation, which stops magnetron oscillation).
see Fig. 3
6-5 When the CANCEL pad is touched during cooking
1. Touching the CANCEL pad once stops cooking. Touching on the pad twice cancels all programs stored
in the touch control circuit. The time of day reappears on the display window.
2. The oven lamp and cooking indicators turn off.
3. The fan motor stops.
4. The power control relay turns off to cutting the primary voltage to the high voltage transformer (This
stops magnetron oscillation).
Power Relay
Sec Switch
Interlock
Monitor
Switch
H.V.Trans
Primary Switch
Monitor Fuse
