Question about Panasonic NN-C994S Convection/Microwave Oven

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NO power display dimesnion 4 range national microwave NNC 2000P MODEL

All of a sudden when I started my microwave oven .I found no power indicator in display and nothing is there.On checking power side I found everything ok and also there is voltage coming . so I switch off after opening cover for inspection I cannot find any burning component , all is brand new condition, oven is 4 yrs old and sparingly used; ONly after I switch off supply from socket .I notice there is back voltage at terminal of plug top indicating some built up charge when the oven was connected and same appeared back after switching off (this is mentioned just to indicate for some clue in locating fault)

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  • rajendra panchal Mar 21, 2007

    Thanks can u email me link for circuit diagram layout so that i can located this transformer, I can see transformer (brown colour) fixed on circuit board of display.Is that the one. is there any way to first see whether voltage is coming to primary side? You mean replace transformer or first to check other component on primary side.Your guidance will be helpful please

  • rajendra panchal Mar 21, 2007

    Further to my reply .I wish to update that I opened PCB with transformer from rear side of Front display board.
    I checked Primary it has 240 volts and also secondry all voltages viz-30 v etc are there .Pl note that from this board a connector jumper gets connected to other board )there are two PCS laid on back to back )which has micro swithes/ push button and LED display and other control button which are operated from front viz. time/temp/selection of oven etc etc
    What should I do next as there is no display at all ?

  • rajendra panchal Mar 27, 2007

    I REPLACED THE TRANSFORMER BUT ALWAYS ONCE AGAIN PRIMARY BECAME OPENED. ON THIS TRANSFORMER P1 AND P2 TERMINALS ARE IN FACT LOOPED WITHIN TRASNFORMER HENCE I SHORTED THIS TERMINAL AND MICRO STARTED WORKING BUT I WANT TO ASK IS IT CORRECT TO DO SO? WHY THIS P1 AND P2 IS GETTING OPENED , IS IT DUE TO OVERLOAD ??
    WHAT TYPE OF PROTECTION TRASNFORMER HAS INHERENT??
    KINDLY GUIDE ME

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On front panel there is alow voltage transformmer the primary side isopen circuit replace

Posted on Mar 20, 2007

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Where do I go to download manual for National Microwave NN-K577WF


Hello, Vishal -

I have not yet found a manual for a National microwave model NN-K577F online.

The National brand was a subsidiary brand of what is now known as Panasonic. National brand kitchen appliances stopped being manufactured in 2008.
Source of information:
https://en.wikipedia.org/wiki/National_(brand)

The Panasonic company may hold a copy of the user manual for the NN-K577WF model in its archives, however.

Panasonic is headquartered in Japan. However, unless you reside in Japan, I suggest you contact the Panasonic division located where you reside:
https://www.panasonic.com/global/support/get_support.html

On the home page for the Panasonic division in your country, there should be a Contact Us link or a Live Chat link. Ask if the company Archives holds a copy of the manual for the National microwave oven NN-577WF or the Panasonic microwave oven NN-577WF and if you can obtain a copy. Note: There may be a charge for a copy.

Best wishes.

Jun 02, 2018 | Microwave Ovens

1 Answer

Need user manual for National model no: NN-8655 Microwave oven user manual...


I would suggest that contact the dealer from whom you purchased the oven or call any number listed on the model tag of the oven.

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1 Answer

I have GE Profile microwave model PVM1870SM1SS and last week while running, suddently it shut off. There is no power, display buttons and stopped running. Please advise.


From the description a major part has failed, the magnetron is suspect because it suddenly shut down in cycle, if the unit is less than 7 years old it probably has a inverter board and tends to fail, also there is the possibility the keypad control board has stopped working. The microwave in my opinion is worth getting checked out and repaired, but it will be expensive.

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I have a whirlpool microwave oven over the range. Model GH 5184xps-4 when I press start, it comes on for one second then it shows a code -F7- and stops


TOUCH PANEL & MICROCOMPUTER BOARD TEST FOR WHIRLPOOL....

The microwave oven may be provided with a self diagnostic routine that can be operated

through the touch pad keyboard. To enter the self-diagnostic routine:

1.While pressing the CANCEL keypad:
a) Open the oven door.
b) Unplug the microwave oven for 2-seconds and plug it back in.
c) Release the CANCEL keypad and close the oven door. You will see the following display.

CHART
NOTE: The humidity sensor test results will appear on the display after 8-seconds.If the tests are successful, "OK " will be displayed. If one or more of the tests fail, "ERR " will be displayed.. 2.When a keypad is pressed, a number according to the test chart will be displayed. When no keypad is pressed, a blank "O" (square) is displayed...

POWER FAILURE & FAILURE CODES
Power Failure: After a power failure, the WELCOME screen will be displayed.

F2 Keyboard Failure: Refer to the Tech Sheet and conduct a touch panel continuity test.

F3 Humidity Sensor Failure: Refer to the Tech Sheet and test the sensor.

F6 Microwave Relay Failure: Check the microwave relay.

F7 Microcomputer Board Failure: Change the microcomputer board.


Hope helps.

Apr 12, 2011 | Whirlpool Microwave Ovens

2 Answers

No power in the microwave but there is electricity at the wallplug


No power and or NO lights at all,indicate a blown fuse.
Locate and replace the fuse inside the unit.

Feb 25, 2011 | Maytag Appliances Over-the-Range Microwave...

1 Answer

New maytag power shuts off and comes back in half hour


Depending on the model you may need a 15 or even up to a 20 amp circuit to operate the microwave. Check the installation instructions to be sure. What is most likely happening is the circuit in your home is not powerful enough to run the load of the microwave oven. If this is the case it could be dangerous. I would strongly recommend you have an expert examine the house wiring prior to starting the unit again.

Apr 20, 2010 | Maytag MMV4205 Microwave Oven

2 Answers

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


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.

Mar 27, 2007 | Panasonic NN-C994S Convection/Microwave...

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