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fuse, oven, start up, stopped working, capacitor

Panasonic NN-C994S 1100 Watts Convection / Microwave Oven

NATIONAL NNN -C 2000P LOW VOLTAGE PRIMARY GETS...


posted by rajendra58 on Mar 27, 2007

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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
I have the same problem.
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Solution #1

posted on Mar 29, 2007
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Guest
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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
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Solution #2

posted on Mar 29, 2007
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MicrowaveSvc
MicrowaveSvc

Rank:Guru Guru
Rating: 87%, 2980 votes
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.
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