Question about Samsung SMH9187 Microwave Oven

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Smh9187w vent fan popping noise

When I turn on the vent fan on my smh9187w I hear a popping noise and the fan just buzzes without any airflow, except on settings 4 and 5. I took off the grill and looked inside while turning on the fan and see that there is some sort of arcing happening in the back near the top. I'll assume this isn't normal. This is a continuation of a previous post where I suspected the PCB, but now I'm thinking it's more likely the vent motor. The unit vents out the back. I had just replaced the control panel prior to this happening, and I can't figure out how these could be related. I'm starting to think they're coincidental. Microwave heats fine; all lights work. Do I need a new motor, or should I disassemble and find where the arc is happening? Thanks!

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There are no bulletins covering a recurring issue with the exhaust fan on this model, so I would suspect the failing motor, an obstruction in the blades, a loose blade assembly, or a damaged wire arcing to the frame.

It will take some visual inspection with the oven removed from the wall (see your installation instructions) and the cover removed.

The service manuals for the variants are here:

http://www.microwavedisplay.com/smh7185_smh9187w_xaa_sm.pdf

http://www.microwavedisplay.com/smh7185_smh9187w_xac_v1.pdf

http://www.microwavedisplay.com/smh7185_smh9187w_xac_v2.pdf

http://www.microwavedisplay.com/smh9187b_smh9187w_smh9187b_xaa_sm.pdf

You can order Samsung parts from the Pros here or from Encompass here.

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

Posted on Dec 11, 2012

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Did this occur after a failure of your cooktop lights?

Or is there is buzzing noise present when the oven is not operating, or when the door is opened?

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There is a a YouTube video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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Chances are this is a problem on the control panel. We repair these for customers nationwide with our guaranteed $39.95 service.

Please feel free to contact me directly if you need more help. And please mention your model number when you write.

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

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