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Sudden work NO TIMER ON THE DISPLAY BUT LOW VOLTAGE SUPPLY OK BUT RLY 1 AND RLY2 COIL SUPPLY IS NOT COMING FROM EAX35425402 PCB.

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6ya6ya
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Posted on Jan 02, 2017

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

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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ginko
  • 19396 Answers

SOURCE: Hi my Panasonic Dimension 4

Re: Thermister at rear of unit is open at room temp. Isn't it supposed to be closed at room temperature? The thermistor is surely defective. Also the door switch testing procedure is not clear. If it is three terminal you mas check that the switch is closing between COM and N.O. terminals when you close the door ( I am generally talking about a three terminals microwave switch, I do not have your oven's model number).

Also test the inverter separately. Read DC in, then make sure that your multimeter can test AC out and read AC out to know if inverter is working. To test the inverter thoroughly you should also use an oscilloscope to check AC phase. Inverter going out of phase is unlikely the problem.

After testing the inverter check oven again (diode and capacitor, door again, wiring , control). Remember to discharge the oven capacitor or you risk to get shocked by an heavy discharge.

Posted on Aug 11, 2011

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2 Answers

Oven suddenly lost heat, inside fuse is OK though. Display, fan, turntable all working. Is it magnetron or its power supply?


You're right, if the lights come on and turntable moves, it is most likely your magnetron.

Jan 23, 2011 | Microwave Ovens

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well inside the unit check for any burn fuses on the power supply area, and into the control board. fuse basically the one will tripped if power surged occurred..

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Kenmore microwave mod. 721.80412500 does not heat, timer,lights,fan ok.possible to try a fuse,before calling sears?


If the fuse were blown, You wouldn't even get a display. If you're handy with a multi-meter, and feel somewhat comfortable making electrical tests, the first thing to check is whether the problem is coming from the low voltage (control) side of the oven, or the high voltage side (transformer, magnetron, capacitor and diode).

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.

Set your meter to test for house voltage (the 200VAC range). Plug the machine in and select a cooking cycle. While it's trying to cook, place your meter's leads on the wires coming from the control board to the primary terminals on the transformer. You're looking for a reading that's reasonably close to 120VAC. If you don't get enough voltage, the problem is with the control board. If you do get the required voltage, the problem is in one of the high voltage components.

Write back with your results for further diagnosis.

Dec 24, 2010 | Kenmore Microwave Ovens

1 Answer

Sanyo EM-710F display dead


Low voltage Tx actually OK. Restored vaporised circuit tracks on controller board, fuse and interior light globe. All working OK.

Jun 18, 2008 | Microwave Ovens

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Frigidaire over the range microwave oven has stopped heating...you set the timer and it acts like it is coming on (light and timer works, but no heating happening). the ventahood and light still...


The high voltage power supply for the magnetron, or the magnetron, or the output drive from the logic uPC board may have failed. The service tech is able to test these areas by taking readings to determine where the fault is.

Jerry G.

Apr 19, 2008 | Microwave Ovens

1 Answer

Brother put a foil wraped burger in micro now everything is dead


Hi, You may want to try to check/troubleshoot the PCB underneath the display/control panel. The mains do supply two circuitries: the heavy load and the electronics. In some units, they have a standard transformer while in others an SMPS that supplies the +5 (and sometimes +12 or higher) voltage. This powers the electronics which includes a microcontroller, timer, relay drivers and display panel. Trace the transformer/SMPS and look for any fusible link, secondary fuse or surface mounted fuse. More often than not, there are also standard components along the way like bride diode, diode, filter capacitor and regulator IC. Check for VDC input and output of power components. Hope this gives you an idea, Pls post again how things turn up or if you need further information. Good luck and kind regards.

Aug 11, 2007 | GE Spacemaker JVM1640SJ 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...

1 Answer

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


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

Mar 20, 2007 | Panasonic NN-C994S Convection/Microwave...

2 Answers

LCD display is working but very dim and hard to see


This is a common failure of the control panel assemblies of these and similar microwaves. We repair these control panbel assemblies nationwide for only $32.50. If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

Feb 18, 2007 | Sharp R-326FS 1100 Watts Microwave Oven

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