Question about Panasonic NN-SN657S Microwave Oven

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How much does it cost to replace controller, or inverter or a bad magnetron.

My microwave will only run for about 5 seconds in the troubleshooting it states to replace controller, or inverter or a bad magnetron.
how much does this run

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  • chrlssmith99 Jul 28, 2008

    Thank you I was affraid of that

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More than the unit is worth.

Posted on Jul 26, 2008

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1 Answer

Samsung microwave malfunction


I too have this problem with my KitchenAid KHHS179LSS-5 model. Based on the owner's manual I located behind the grill which pulled off, the F7 Error code indicates that power to the magnetron was interrupted. You will want to make the following checks: 1. Unplug microwave oven or disconnect power. 2. After 40 seconds, check to see whether this solves the problem. 3. Unplug microwave oven or disconnect power. 4. Check resistance of the magnetron thermostat. 5. Check the magnetron. 6. Check wiring to the 1100W inverter and control system. See "Checking Inverters." 7. Plug in microwave oven or reconnect power. 8. Check operation of all interlock switches. Check door, hinge and cavity front alignment. Adjust as needed. 9. Unplug microwave oven or disconnect power. 10. If switches operate correctly, replace 1100W inverter. 11. If problem persists, replace electronic control. 12. Plug in microwave oven or reconnect power.

After removing the control display, there is a virtual zoo of connectors. So unless you repair microwaves on a regular basis, it may be difficult to ascertain which ones go to the magnetron thermostat. I will probably resport to shelling out the dough to get someone to fix it. Sorry I couldn't be more helpful.

Jun 27, 2013 | Microwave Ovens

1 Answer

I have a that microwave gh7208xrs that shows a error code F7 HVSMPS feedback


The controller is not getting the high voltage switched-mode power supply feedback signal.

Sometimes this is due to a defect on the HVSMPS (inverter) or a bad connection from the HVSMPS to the controller.

Due to the voltages involved, I do not recommend that an inexperienced person attempt to troubleshoot an inverter.

In the event that you or someone you know wants to look into it, see these safety warnings first.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

It tells you this:

F7 Power to magnetron interrupted
1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check the magnetron.
6. Check P65 connection on the relay control board.
7. Check the P56/P66 connection between relay board and relay control
board.
8. Check wiring to the 1200W inverter and control system. See "Checking
Inverters."
9. Check operation of all interlock switches.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave
oven or disconnect power.
13. Replace inverter.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
18. Replace all parts and panels before operating.
19. Plug in microwave oven or reconnect power.
20. If problem persists, unplug microwave oven or disconnect power.
21. Check for reversed plug connection on controls or loose wiring.
22. Replace all parts and panels before operating.
23. Plug in microwave oven or reconnect power.

I'd suspect 6 through 8 first.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jul 08, 2011 | Whirlpool GH7208XRS Stainless Steel 1200...

1 Answer

Whirlpool microwave shows f-7


From the technical sheet hidden behind your control panel and online here:

F7 Power to magnetron interrupted
1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Check resistance of the magnetron thermostat.
4. Check the magnetron.
5. Check wiring to the 1100W inverter and control system. See “Checking
Inverters.”
6. Check operation of all interlock switches. Check door, hinge and cavity front alignment. Adjust as needed.
7. If switches operate correctly, replace 1100W inverter.
8. If problem persists, replace electronic control.
9. Plug in microwave oven or reconnect power.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Sep 07, 2010 | Whirlpool GH6177XP Microwave Oven

1 Answer

Microwave


Hi

3 things can fail - the control board, the inverter board, or the magnetron. If the microwave runs for about 7 seconds with a ticking sound..then stops and shows "F-9", it is the magnetron that has failed. The fact that the unit starts and runs with the TICKING SOUND means the control board is sending signal to inverter board and the inverter board is sending signal to magnetron. Magnetron is covered by full 5 year warranty, inverter board is only 3 years.

If this is not the case then it could be a defective control board, inverter or line voltage too high.

Please do rate the solution as "FixYa" if found useful and revert for further assistance.

Thanks
Rylee

Mar 26, 2009 | Kenmore 63682 / 63684 / 63689 Microwave...

1 Answer

Microwave not working properly


The F-9 code indicates that there's an inverter board failure. A bad magnetron will also make it think the board is bad. The inverter board takes the place of the High Voltage Transformer, Capacitor and Diode which other models have. Parts and labor is probably around 300-400. It's not too hard to do, Pulling the micro off the wall is the hardest part.

Mar 11, 2009 | Kenmore 62622 Microwave Oven

1 Answer

Model 72180883400


Hi,
F-9 error code indicates a defective control board, inverter or line voltage too high. f the microwave runs for about 7 seconds with a ticking sound..then stops and shows "F-9", it is the magnetron that has failed. The fact that the unit starts and runs with the TICKING SOUND means the control board is sending signal to inverter board and the inverter board is sending signal to magnetron. Magnetron is covered by full 5 year warranty, inverter board is only 3 years.

Sep 01, 2008 | Kenmore 62702 Microwave Oven

1 Answer

Microwave F-7 Code


F7 is q Power to magnetron
interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check resistance of the magnetron thermostat.
6. Check the magnetron.
7. Check P2, P4 and P27 connections.
8. Check wiring to the 1100W inverters and control system. See
“Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace inverter, if defective.
11. Replace all parts and panels before operating.
12. Plug in microwave oven or reconnect power.
13. If problem persists, unplug microwave oven or disconnect power.
14. Replace electronic control.
15. Replace all parts and panels before operating.
16. Plug in microwave oven or reconnect power.
17. If problem persists, unplug microwave oven or disconnect power.
18. Check for reversed plug connection on controls or loose wiring.
19. Replace all parts and panels before operating.
20. Plug in microwave oven or reconnect power.

Aug 08, 2008 | Whirlpool GH6177XP Microwave Oven

1 Answer

Panasonic Model NN T964SF inverter microwave runs for less than 5 seconds and shuts off. Power control function does not work either. Pressing power control a number overrides cook time with power...


If the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

In most cases, this is a problem with the inverter or a bad magnetron.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Aug 02, 2008 | Microwave Ovens

1 Answer

F9 error


Your Microwave uses "UltraWave technology"
I'll explain a few things about this wonderful technology...
The control board (accepts the pushbutton commands) has to talk to the inverter board to tell it how much power should be applied to the magnetron. The inverter board will then power the magnetron and inform the control board if the magnetron is working OK.
If there is something wrong with the magnetron or inverter board or a there is a communication breakdown between the control board and the inverter board...WA-LA-----F9----

A pretty reliable test for the Magnetron is to operate the oven and listen for a ticking sound 5-6 times about a second apart. If you can hear the ticking....The magnetron has failed..if no ticking, the control or inverter board failed.

The Magnetron sells for about $78.00 and is simple to replace. Check your owners manual for limited warranty on the MAG and electronic parts.

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3 Answers

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This model uses an inverter to produce high voltage instead of a convential transformer system. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.

Dec 21, 2006 | Panasonic NN-T990SA Microwave Oven

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