Leap WP600 computer controlled microwave uses CPU MC68705/R3 control the operation of the machine , microwave heating and show belong to a single microwave heating models. The circuit mainly by the door switch control circuit and computer control circuit.F9tservice manual download site

WorksF9tservice manual download site

( 1 ) door switch control circuitF9tservice manual download site

The whole wiring is shown below. When the door opens , the door interlock disconnect switch S1-S3 , S4 closed door monitoring switch . High-voltage transformer T, high voltage diodes Vl, high voltage capacitor C, the composition of the magnetron microwave heating system.F9tservice manual download site
 F9tservice manual download site

High-voltage transformer T secondary output of about 3.4V and more than two 1800V AC voltage . 3.4V AC voltage is directly applied to the magnetron cathode filament F FA and ends as the filament voltage ; 1800V AC voltage above fuse high pressure transmission by Vl negative rectified , filtered and then converted to the C negative DC voltage above 3600V , start magnetron , 2450MHz microwave transmitter . Computer control panel is responsible for receiving user instructions , door status monitoring , and then according to the logic processing software setup , control relays Kl, K2 -off to determine the status of the microwave oven . . Oven lamp / turntable motor M1 / M2 fan motor circuit : 220VL → S2 → Ml/M2/EL → → Sl → relay contact K2 Fuse FU → 220VN.F9tservice manual download site

High voltage transformer power supply circuit : 220VL → S2 → high voltage transformer T → S5 → → relay contact relay Kl K2 contacts → Sl → fuse FU → 220VN.F9tservice manual download site

( 2 ) computer-controlled circuitF9tservice manual download site

1 ) When the protection circuit door open , Sl, S2 disconnected, double cut Ml, M2, EL, T power supply circuit , so that microwave heating operation is stopped or disabled . Assuming the door open , Sl, S2 remains in the ON state, then a short circuit S4 to 220V , a large short-circuit current will blow the fuse FU , 220V power supply circuit off . Further , disconnected S3, CPU notification door is open for an additional level of protection .

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