Question about Jenn-Air JMC7000 Microwave Oven

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JMC 8100ADB How can I determine if I need to replace the capcitor or magnetron? Unit blows internal 20a fuse -

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Check the capacitor with an ohmmeter, if the meter reads 0 ohms the capacitor is bad and needs to be replaced. More likely, though, the magnetron is bad.

Posted on Sep 23, 2009

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Microwave Dead


Having 20 year experience fixing microwaves i know that when the fuse goes that if you can't find a melted wire or overheated components on the circuit board that the high voltage capacitor at the back needs to be replaced. Sometimes you have to replace the magnetron too. You can replace the door switches if you like, microswitches are inexpensive but would only be bad if arced inside so bad that you read over 1 ohm.

Nov 25, 2013 | Microwave Ovens

1 Answer

My Maytag Microwave is blowing the 250v- 20a fuse behind the key panel on the black wire. It melted the fuse holder mounted to the main body of the unit. Any thoughts on why?


The magnetron is shorted, the keypad control board is bad, blowing fuses. If less than 7 years old it has a inverter board that can be trouble, But with the level of work and parts it will easily exceed the cost of a new microwave oven.

Apr 07, 2012 | Magic Chef CMV1100 Microwave Oven

1 Answer

Can I replace an internal thermal fuse in my jmc7000 jenn-air microwave?


It doesn't have a thermal fuse, but it has a 20A ceramic fuse and on or around the magnetron it has a thermostat.

The 20A fuse (if blown) can be had in local appliance parts store, and places like Lowe's Home Depot, and Wal-Mart.

For the fuse and/or thermostat, you can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

If the fuse is blown and it blows again, it may be a loose fuse holder, shorted high voltage capacitor, or door switch trouble.

If the thermostat failed, it's due to a magnetron overheating due to the internal cooling fan's not working, or just the magnetron itself going bad.

As a bonus, you can find your owner's manual online here free.

If you need further free help, let us know.

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

Oct 06, 2011 | Jenn-Air JMC7000 Microwave Oven

1 Answer

Over the range microwave just stopped working while it was on. Is about 9 years old. Checked breaker and is on.


sometimes just the internal units fuse blows from age/use it is called a ceramic fuse,you need to remove the outer cover to replace this,carefully before touching anything inside the unit take 2 insulated screw drivers and discharge the hi voltage cap,then replace the fuse and try it,if it blows again,then suspect a shorted hi-voltage capacitor(especially if there was no arc during shorting it with the screw drivers) or a hi voltage diode shorted or the magnetron unit has begun drawing hi current or is also shorted

Mar 23, 2010 | Microwave Ovens

1 Answer

Oven light only, everything else dead. no display. ewave mod. kot131uw


Usually means the internal 20A fuse is blown because the magnetron is shorted. If it's over 5 years old, it's probably a goner. You can check the fuse by removing the access panels but be sure you've unplugged it from power first.

Jun 12, 2009 | Microwave Ovens

2 Answers

No power!


There's an internal fuse - about 20 Amps. It usually blows when the magnetron dies. Unplug the unit from the wall and access the internals. You should plainly see the fuse holder - remove and check the fuse. Spares are available at any ACE hardware store. If the unit is more than 5 years old, I wouldn't mess with it.

May 24, 2009 | LG LRM1260SW Microwave Oven

1 Answer

Kenmore Micro/Oven fuse keeps blowing


Disconnect the connector to the primary winding of the high voltage transformer. Put a new fuse . If the fuse is not blowing the problem may be in the secondary side of the high voltage transformer. Chek the highvoltage diode, capacitor, magnetron respectively. you can also check the primary winding of the low voltage transformer.

May 23, 2009 | Microwave Ovens

1 Answer

Blows main fuse 20A,250V when press start microwave.


First things first, check the big cigarette can type capacitor. OHm it out should not be shorted, meaning reads zero ohms. use ohm meter, set to ohms, put leads across 2 terminals (after your short them with a screwdriver)should not read zero..

next replace magnetron, it's easy, call appliance repair for price if it makes sense and your a gambler replace it.

Mar 06, 2009 | Microwave Ovens

1 Answer

Microwave runs but does not blow heat


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))....

Oct 03, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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