Question about Panasonic NN-C994S Convection/Microwave Oven

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NATIONAL NNN -C 2000P LOW VOLTAGE PRIMARY GETS FREQUENTLY OPENED

I replaced low voltage transformer on PCB of display board , and when i started for a while all was ok but next day when i started microven once again this transformer got opened and my oven stopped working, on transformer there are 2 terminal marked P1 and P2, can some one explain why this is happening , is it correct to loop P1 AND P2 externally(as i believe this are looped inside transfomer,and due to some reason gets opened) Please guide on possible cause and rectification

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I had looped externally P1 and P2 and now it is working , to assure myself I also checked current in primary of transformer it was measured to be from 300 mA to 600 mA when I started to use microoven. For safety I had now fixed 2 Amp fuse between P1 and P2. Is that all ok. To add I checked all voltages mentioned on PCB viz. 30volt, 5 volt etc which on measuring were found almost ok. Any comments please

Posted on Mar 29, 2007

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  • Panasonic Master
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There is something on the secondary side which is drawing too much current. I would check all electrolytic capacitors, zener diodes, transistors, and voltage regulators.

Posted on Mar 29, 2007

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LG ldg3016st has no power on main control panel


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Unplug the oven and remove the cabinet cover. Before reaching into the chassis, discharge the capacitor by shorting between the two sides with a screwdriver or similar tool. It can store up to about 2000 volts, and can hurt you badly. A brief touch with your shorting tool is all that's necessary.

Disconnect the wire lead that goes from the power transformer (the largest component on your oven's right side (as you face the door), to the capacitor. Insulate it against any metal contact by wrapping electrical tape around the connector.

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