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Microwave oven control board

Have you received my control board? I would appreciate some communication from you on its status. The USPS tracking says it was delivered to you on Sept. 11th.

NYBob

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I need part number WB27X5399, a control board.

Thanks,

Jay
Jaygrabowski1@aol.com

Posted on Nov 19, 2008

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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.

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F7 Power to magnetron interrupted
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8. Check wiring to the 1200W inverter and control system. See "Checking
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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
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15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
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21. Check for reversed plug connection on controls or loose wiring.
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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.

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We see and repair this on a regular basis with our $39.95 service. Details are here.

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moz-screenshot.pngmh6130xeq-1_panel_smaller.jpg?filename=mh6130xeq-1_panel_smaller.jpg&q=786obatqb1684s0931&o=4337&contentlength=75762&downloadid=ebf28cd0ae6c0b1566d991c489678ab1

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Whirlpool microwave oven


There should also 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 says:

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.

If for some reason your tech sheet is not there, you can download it here.

We regularly repair control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

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prototech@usa.net
http://www.microwavedisplay.com

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We're happy to help and we appreciate your thoughtful rating of our answer.

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prototech@usa.net
http://www.microwavedisplay.com

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