Daewoo KOR-61151, KOR-61155 Circuit Description, When the timer is set to the time desired

CIRCUIT DESCRIPTION

1.When the food is placed in the oven cavity and door is closed.

•The contact of the interlock monitor switch open.

•The contacts of the primary interlock switch and secondary interlock switch close.

	Primary
	Interlock	Timer
15A Fuse	Switch	Switch
	Interlock
	Monitor	TM	CL	GM	FM
	Switch
		Secondary
		Interlock
		Switch
TM Timer motor	CL Cavity lamp	GM Geard motor	FM Fan motor
	Fig. 1

2.When the timer is set to the time desired.

•The contact of the timer switch close.

•Oven lamp turn on.

•120V AC is applied to the high voltage transformer.

•Turntable motor start rotating and glass tray rotating.

•Fan motor rotating and cools the magnetron by blowing air.

•Timer motor operating and point to passing cooking time.

•3.3 Volts AC is generated from the filament winding of the high voltage transformer. This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils.

•A high voltage of 2000 Volts AC is generated in the secondary of high voltage transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor. This resultant D.C voltage is then applied to the anode of the magnetron. As shown in Fig. 2 the first half cycle of the high voltage produces in the high voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begins.

The disturbance wave generated by the magnetron is prevented by the choke coils of 1.5µH, filter capacitors of 500pF and the magnetron’s shielded case so that TV and radio programs are not impaired by noise.

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