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Microwave is suddenly extra noisy and not cooking #936975
04/13/18 10:59 PM
04/13/18 10:59 PM
Joined: Jul 2015
Posts: 31
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johninpa Offline OP
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johninpa  Offline OP
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J

Joined: Jul 2015
Posts: 31
Samsung MW4351 from 1997. After some research, I took the diode out and tested it with a 9v battery. It's continuous in both directions, ie not a diode any more, so I'd like to replace it as step one. Can I replace it with any microwave diode that fits? I can't find any parts info on my particular model number.

Thanks

John
PS Removed diode, square cross section, is labeled HVR-1X 3 and SK 6009. Shrunk on insulation says VERSAFIT (9.0/4.5) CSA.

Last edited by johninpa; 04/13/18 11:03 PM.
Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #936985
04/14/18 03:45 AM
04/14/18 03:45 AM
Joined: Sep 2003
Posts: 12,850
Ont Canada
jeff1 Offline
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jeff1  Offline
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Posts: 12,850
Ont Canada
Hi,

Quote:
MW4351


Please recheck, I could only get close.
MW4371G/XAA MW5351G/XAA

Quote:
Can I replace it with any microwave diode that fits?


Not really.

This is a common Samsung microwave diode...

- High voltage diode

jeff.

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #937127
04/16/18 04:43 AM
04/16/18 04:43 AM
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johninpa Offline OP
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johninpa  Offline OP
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J

Joined: Jul 2015
Posts: 31
Thanks,Jeff!
That's all there is in the model no. box.

I'll try your suggestion for a part.

John

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #937132
04/16/18 12:16 PM
04/16/18 12:16 PM
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johninpa Offline OP
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johninpa  Offline OP
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Posts: 31
No longer on site but there may be final letter G as in Model 4351G.

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #937190
04/17/18 02:39 AM
04/17/18 02:39 AM
Joined: Sep 2003
Posts: 12,850
Ont Canada
jeff1 Offline
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jeff1  Offline
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That one seems to work...

MW4351G - Common repair parts linked here.

Comes up as the same diode I linked to.

jeff.

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #938069
05/02/18 03:53 AM
05/02/18 03:53 AM
Joined: Jul 2015
Posts: 31
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johninpa Offline OP
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johninpa  Offline OP
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Joined: Jul 2015
Posts: 31
Diode does the trick; it's a microwave again!
Thank you ,Jeff, yet again for excellent support on my appliance problems.

John

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #938089
05/02/18 03:21 PM
05/02/18 03:21 PM
Joined: Jul 2015
Posts: 31
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johninpa Offline OP
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johninpa  Offline OP
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J

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Posts: 31
Woops, egg on face. Late at night I didn't test for actual heating. I knew the old diode wasn't a diode and assumed one problem at a time!
So, no heat, new diode tests ok with 9V battery, three door switches all change continuity between open and closed door positions. I believe I have done all I should as an amateur.
I guess 20 years of nearly daily use isn't bad!

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #938149
05/03/18 02:33 AM
05/03/18 02:33 AM
Joined: Sep 2003
Posts: 12,850
Ont Canada
jeff1 Offline
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jeff1  Offline
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Joined: Sep 2003
Posts: 12,850
Ont Canada
We sometimes run into a magnetron that damages a diode or a diode that damages the magnetron and must do both at the same time.
A quick test of the mag...
http://www.applianceaid.com/ge-otr-microwave.php

jeff.

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #938173
05/03/18 04:45 PM
05/03/18 04:45 PM
Joined: Jul 2015
Posts: 31
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johninpa Offline OP
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johninpa  Offline OP
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Thanks, Jeff!

Check 120V supplied to primary of transformer with light bulb: lights up! Re-connected.

Disconnected magnetron, run 2-4 sec: capacitor grounded: small spark, no sound (repeated three times).

New diode still has polarity.

Magnetron?

john

Re: Microwave is suddenly extra noisy and not cooking [Re: johninpa] #938194
05/04/18 02:09 AM
05/04/18 02:09 AM
Joined: Sep 2003
Posts: 12,850
Ont Canada
jeff1 Offline
Carpal Tunnel
jeff1  Offline
Carpal Tunnel

Joined: Sep 2003
Posts: 12,850
Ont Canada
Power in, getting a spark, should tell us we are creating high voltage but the mag is not using it. Which indicates a bad mag.

jeff.


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