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AlexM

Wolf Microwave Drawer Unit: Are The Guts and Trouble Shooting the Same As any MW?

15 posts in this topic

I'm respectfully comfortable diagnosing and safely repairing microwaves...

 

I have not been on this call, but I assume my trouble shooting logic will apply to this drawer unit the same?

 

Will it be obvious how to get the unit out of the cabinet?

 

Has anybody worked on these?

 

Its a totally 'dead' unit at this point.

 

thanks

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Need appliance parts? Call 877-803-7957 now!

model number ?

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They are bulky and hard to grab a hold on...a shitload of screws to remove panels...but otherwise, a pretty basic microwave, functionally . Pray you never have to work on the drawer drive motor or rails.

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Help!

 

Only one problem with getting the model number.  They were baking a potato and the unit is totally dead, and the drawer will not open.

 

I have a lot of pry bars and cutting torches from my previous life...any hints on getting this out of the cabinet without using them

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I've played with this unit at Sub Zero/Wolf training but haven't encountered on in the field yet.  It looks like you should be able to carefully force the drawer open by slowly pulling it forward.  Doing this may or may not damage the drawer motor or gear but I don't see any other options.  Once drawer is open there are four mounting screws that once removed, drawer can be closed and entire unit removed from cabinet.  Microwave diagnostics are the same as any other with the exception of the pcb.

Edited by PDuff

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  • Thanks, I will let you know how it goes.

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Model# MWD24-2U/S   Serial# 1201610

 

OK>  After all the scare, all I did was open up the drawer manually, no problem.  The customer had me scared, they didn't want the potato stuck and smelling inside, they never tried manually opening.

 

Now I'm stumped:

 

This is a 'dead' condition, and I think the problem is on the high side, but can't narrow it down, This is what I know:

 

1. I found the thermal fuse next to mag was blown, jumped it to proceed with test. Then it turned into a 'runs, but no heat' condition.

 

1a Ran unit and it was pulling 7.2 amps with my meter...that started me looking into high side.

 

2. Tested for 120vac at primary side and did have it, OK.

 

3. Diode checked OK (continuity one way only)

 

4. Capacitor seems OK, (Analog meter set on RX10k and got the needle to jump)

 

5. Less than 1ohm between F & Fa, open between F & Fa and ground, no visible damage on mag, passes visual inspection.

 

6. had around 3 ohms on transformer, primary side.

 

7. checked monitor and secondary switches, seem OK

 

8. Stir motor runs OK

 

9.  Regarding noises, no normal noises like you would expect if the mag was working.

 

any suggestions on where to go next?

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...any microwave experts willing to help me guess? 

 

I'm thinking transformer or magnetron?

 

Don't be shy, I will accept any guess, except spark plugs.

 

Thanks

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It could be the magnetron, Alex.  Provided the cooling fan and stirrer motor operate and the display is not affected (timer counts down, no missing segments) then the power control board should be ok.  I can provide a relay test for that control if needed but try this first.  Examine the mag for damage like a cracked magnet.  Next with everything connected run the unit for a few seconds then de-energize.  Discharge the capacitor and feel the case of the magnetron.  If it feels warm then it's getting voltage, meaning the rest of the high voltage circuit is good but the mag is bad, regardless of filament resistance.

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Great advice, I already ordered the magnetron and thermal fuse.

 

The only thing that has me second guessing is that the magnetron looks to be great shape, no cracked magnets, no burn marks, etc.

 

I will let you know when I swap it out.

 

Thanks for chiming in!

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Many bad magnetrons look perfect and can even ohm out correctly and yet they still don't work. 7.2amps tells you that the high voltage is trying...but needs a magnetron.

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O.K. I finally put in a new magnetron and thermal fuse.  The unit heats water, quickly and everything runs great.

 

When I removed the old mag, a micro crack became apparent on one of the magnets...found the issue.

 

Here is my follow up question. I left the sheet metal housing off the back, and noticed that the wave guide channel is heating during operation, is this normal? normal for all microwaves?

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shout out to micowave experts...

 

Do the the wave guide channels heat up during operation?

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Yes, the wave guide will get warm during operation, lots of energy being directed down the wave guide into the microwave cavity.

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